Industrial Automation and Control Interview Questions

What is cascade amplifier?

 A multiple-stage amplifier in
which the output of each stage is connected to the input
of the next stage.
What do you mean by cascade control? 
Control in which the output variable
of a controller is the reference variable of another
controller(s).

What is command in Control Systems?

Command is an operative order which initiates a movement or a function. The order may be: 

1. direct input to the machine in coded form; 

2. results from a logical interaction of instructions from an outside source with conditions sensed
by the machine; 

3. outputs derived from the computing or comparing function.

What is derating factor?
The factor by which the ratings of component parts are reduced to provide additional safety
margins in critical applications or when the parts are subjected to extreme environmental conditions for which their normal ratings do not apply.

What do mean by interconnection system?

The electrical and mechanical interconnection of any one or all of the six levels
of interconnections generally common to electronic equipment. The six levels of interconnections are: intramodule, module to motherboard, intramotherboard, motherboard to back panel, backpanel wiring and input/output.
What is manual control in industrial automation?
 Control in which a direct or indirect human manipulation of the final controlling element
is carried out. In the process industry, this is generally done via a standardized signal. Can also be defined as direction of a computer by means of manually operated switches. 

What is automatic control system?

 A control system which operates without human intervention. It is subdivided into a controlling system and controlled system.

What do you mean by automatic zero-and full-scale calibration?

Zero and sensitivity stabilization by servos for comparison of demodulated zero-and full-scale signals with zero and full-scale references.

What are pneumatic system?

A system which makes use of air for operating control valves and actuators (cylinders,
motors).

What Are Common Electrical Interview Questions?

Electrical interview questions one might expect to answer during a job interview may fall into three categories: education, experience, and certification. In addition, preparing for a job interview will generally entail having a current, well-prepared resume and demonstrating desirability as a potential employee. Electrical interview questions will depend upon the specific job within the field; an applicant for a job as a residential electrician will field different questions from an electrical engineer.

Presenting a well-prepared resume is one of the primary tips for a job interview. This document will form the basis for many of the interview questions addressed to the applicant. The resume should provide specifics about all pertinent past and current employment information as well as contact information, education, and work experience. Dates and duration of job experience and electrical training are typically a necessity.

If a job is being sought from a large employer, an applicant may have at least two interviews, one from a human resources (HR) representative and one from a qualified manager. Questions regarding general qualifications and references might be expected in an interview by the HR staff member. Electrical interview questions typically will be asked by a manager with electrical training and will often include questions about knowledge and skills directly related to the job at hand.

Questions To Ask Electrical Contractors

Hiring electrical contractors is an important task. One of the most important parts of the process of choosing an electrical contractor is a brief question-and answer session. The questions should be designed to answer any questions you may have about the contractor. The time spent talking with the contractor should also give you a better idea if that's the kind of business person you want working in your home.

• What are your qualifications? This is a basic question that should be among the first you pose to any person who is going to perform work for you. What you want to hear is that the contractor is licensed and has experience in a wide variety of areas, including the specific work that has you searching for electrical contractors.
• Tell me about this job. Does the contractor seem knowledgeable about the job? Is he or she able to explain the project is easy-to-understand terms? This is a good opportunity for the contractor to impress you with his knowledge, demeanor, personality and salesmanship. You don't have to find the nicest person in the world to do some electrical work in your home, but it doesn't hurt if you sense that the two of you will get along well. After all, there is always the possibility of a problem with the job, and at that point you want someone who is reasonable and easy to communicate with.
• Do you carry the appropriate insurance? This should be more than a yes or no answer. You want to know if the electrical contractors you are interview have general liability and worker's compensation insurance. Legitimate electrical contractors will expect the question and have the paperwork to proof they carry proper insurance.
• Is your company in good standing with the state? If any of the electrical contractors you are considering haven't properly handled licensing or tax obligations with the state, you're better off moving on to other candidates. This isn't the kind of question you take at face value. You should inquire with your state's Secretary of State or Attorney General offices - one is likely the agency the maintains records on corporations working in the state.
• Please provide several references. In fact, it's a good idea to ask for references from the last few jobs. That may or may not be possible, since every customer won't agree to be listed as a reference. However, for electrical contractors who do good work, most customers are happy in return to offer positive references.
• Give me a cost and timeline for the job. You want more than when the job will be finished. What is the expected work schedule and will there be any time off during the project? As far as the price, what could cause the final price to come in higher or lower?
• Can you put the job terms in writing? Also ask for a contract, which serves as a means of protection for both you and the electrical contractors. The contract should briefly describe the job, include the cost, time frame and whether the contractor is expected to clean up each day or at the end of the project.

Electrical Contactor, Switch, Circuit Breaker Difference

An Electrical Contactor is a switch. In simple words contactor is a switch which closes its contacts with the help of relay. Most of the contactors operate by electromagnet, thus causing the contactors to close and open by spring or gravity. The main difference between the contactors and switch is that contactors can be operate remotely whereas switch has to be manually operated at the location. Contactors can be controlled by manual or remote push buttons or by automatic devices such as timers, float switches, thermostats, pressure switches and so on. As the control is both remote and automatic they are employed in lighting, heating, air conditioning and motor loads

• Circuit Breaker interrupts the fault current which electrical contactor cannot. Generally contactors are connected in series with fuse. Therefore during short circuits fuse acts as fault current interrupting element in the circuit. In simple contactor is a switch with remote control and automatic functions. Circuit breaker is employed to protect the circuit and electrical contactor is used to open and close the contacts
• Contactors are generally employed in low voltage and medium voltage level. Circuit breakers can be employed up to EHV systems for switching purpose

Fuse Advantages Disadvantages in a Electrical Circuit

Fuse is the cheapest protection device in electrical circuit against short circuits and overloading of circuits. Fuse is a metal wire or thin metal strip which has the property of low melting point which is inserted into the electrical circuit as protective device. Fuse provides protection against excessive currents which can flow in circuit during short circuits. Under normal working condition the current flowing through the circuit is within safe limits but when fault occurs such as short circuit occurs or when load more than circuit capacity is connected to it, current exceeds the limiting value results in fuse wire gets heated up, melts and break the current. Thus fuse protects the machine or electrical equipment against the excessive currents.

Time for blowing out of fuse depends on the magnitude of the excessive current. Larger the current more rapidly the fuse blown off. Thus fuse have inverse time characteristics. Such characteristics is desirable for protective gear. 

Fuses are used on low and high voltage circuits of moderate to high capacity where frequent operation is not not expected. Fuse is employed for protection of distribution transformers, small and medium size motors, lighting circuits, branch circuits of distribution lines, in industrial plants and commercial buildings. 

Advantages:

• Fuse is cheapest type of protection in an electrical circuit
• Fuse needs zero maintenance
• Operation of fuse is simple and no complexity is involved
• Fuse has the ability to interrupt enormous short circuit current without producing noise, flame, gas or smoke
• The operation time of fuse can be made much smaller than operation of circuit breaker. It is the primary protection device against short circuits
• It affords current limiting effect under short-circuit conditions
• Fuse inverse time current characteristic has the ability to use for over-load protection

Disadvantage:

• During short circuit or overload once fuse blows off replacing of fuse takes time. During this period the circuit lost power
• When fuses are connected in series it is difficult to discriminate the fuse unless the fuse has significant size difference

Electrical Controls Design Engineer

Electrical controls design engineers require a high level of analytical ability to solve the unusual problems that can arise during their jobs. As the job usually involves working in coordination with other engineers, good team spirit and interpersonal relations is needed. 

Other critical criteria include knowledge of product design and automotives, familiarity with basic machine types, high proficiency in reading and interpreting engineering drawings using the knowledge of advanced engineering methods, tools and procedures, testing, manufacturing and assembling.

Electrical control design engineers also help manufacturing electrical equipment like machinery controls, electric motors, lighting and wiring in automobiles and buildings, aircraft radar and navigation systems, power generating, transmission and controlling used by electric utilities. 

Electrical control design engineers can specialize in different fields such as mechanical, electrical, electronic biomedical, automotive and civil engineering. The projects undertaken are quite interesting and can range from redesigning to maintenance of automotives.

Compared to the other heavy equipment jobs, an engineer specializing in electrical control and design has a less strenuous job. Electrical controls design engineer jobs account for nearly 35% of the total engineering opportunities available. There are job options in nearly every heavy equipment and construction company and the flexibility of the job allows one to relocate quite easily.

Electrical controls engineer interview questions

Electrical systems/electrical controls engineers help develop, design, implement, and maintain electrical systems in many different industries. They may specialize in one particular discipline, such as electrical power distribution, telecommunications, or electronics component design.

Electrical systems/electrical controls engineers have opportunities to benefit the environment in different ways, depending on the projects they work on. They may work on energy-efficient home appliances or HVAC systems. They might work on wind farm projects, or update energy transmission systems so that they can move power from wind farms to areas of need, or help to implement a smarter grid system. In architecture and construction, they can design efficient wiring or lighting systems for new buildings that are seeking Leadership in Energy and Environmental Design (LEED) certification. In fact, some electrical engineers seek LEED Accredited Professional (AP) status themselves, which demonstrates their expertise in sustainable building design practices.

Whether they're developing circuit boards or designing power substations, these professionals have similar work processes. First, they communicate with management or clients to determine the purpose, limitations, and goals of a project. Next, they do preliminary design of the product, often using computer aided design (CAD) software. They perform calculations and make technical drawings of the product or system. Once design is complete and finalized, they might oversee the production or construction of the product, including monitoring the production or installation of components, troubleshooting problems, and ensuring that safety and construction requirements are met. Some electrical engineers also maintain previously-installed electrical systems. A single person may participate in one or all of these steps in the product's life.

The title "Electrical systems/electrical controls engineers" are common job titles for electrical engineers doing green-related work. Electrical engineers can be green across a variety of industries, but the most prevalent green fields are in electrical systems and electrical controls. Most jobs for green electrical engineers in Minnesota are posted by employers as "electrical engineers."

Common Interview Questions for an Electrician

Below are some of the most common interview questions for an electrician. While they may not all come up over the course of a job interview, there is a good chance that more than a few of them will.
Keep in mind that some questions will be specially related to your work as an electrician, while others may be more general job related questions.
Answering these questions can easily mean the difference between whether or not you get the job and you should be prepared to answer them in the event that they do come up.
1)How are you qualified for this job? The interviewer wants to be sure that you have the necessary qualifications to perform the job that they are hiring for. Answer the question by mentioning your education, certification and, if it exists, past job experience related to electrical work.
2)Do you specialize in any specific areas of electrical work? This one can tie into your qualifications and will highlight any specific areas in which you have become an expert. Some electricians specialize in things like wiring and electrical systems while others have focused on more generalized areas .
3) Why do you want to work as an electrician?€“ This common interview question for an electrician is geared more towards people who may be new to the field. The interviewer's aim here is to determine your level of interest and find out what your motivations are.
4) What interests you about this particular aspect of the field?  This question may come up in regards to whether the job is in residential, commercial or industrial work. Be prepared to explain why you prefer to work in one aspect over others.
These are some of the common interview questions for an electrician but there are also a number of common questions that can be asked of people looking for work as an electrician as well as people seeking work in a number of industries.
5)  Why are you leaving your current job?  You may be asked this question if the interviewer sees that you are currently employed. Avoid negative comments towards co-workers and supervisors. Instead, try to focus on job related reasons for wanting to leave your current job.
6) What kind of salary are you looking for?€“ Be honest about your expectations for pay. In order to prepare for this question, try researching how much money others in the industry make and adjust your own expectations accordingly.
7) Why should I hire you?€“ This is an opportunity to sell yourself and say anything that was missed over the course of the interview and, you feel may be important. Avoid using cliched terms like "€œhard-working"€ and try for something unique. Make the interviewer really remember you.
Remember that while job training can help you learn the right skills and placement can help you get an interview, it's up to you to show that your skills can do.
By mastering these common interview questions for an electrician, you'll be well on your way to your new career.

Balfour Beatty Construction Interview Questions

A prominent business in the construction industry, Balfour Beatty Construction interviews candidates to fill a myriad of professional, office, entry-level, and laborer positions. The Balfour Beatty hiring process, according to position, may entail numerous interview types, including college recruitment, 1:1, telephone, group, and panel interviews. Balfour Beatty interviewees may need to submit to drug and personality tests to receive hiring consideration. Balfour Beatty interviewers ask questions from a variety of areas, including work history, education, training, and teamwork.
Dress professionally when attending management and office Balfour Beatty Construction job interviews. Wear business casual garb to entry-level and laborer Balfour Beatty interviews unless a hiring manager specifically requests applicants in casual clothes. Remain calm and focused during the Balfour Beatty hiring process and answer all questions carefully, honestly, and briefly. Maintain eye contact with each interviewer in the room during all stages of the Balfour Beatty interview process. Wait a few days upon completion of the Balfour Beatty Construction hiring process before inquiring after intent to hire, as many Balfour Beatty interviewers do not offer hiring information during the interview process.

Positions:

Balfour Beatty Construction typically hires for the following positions:
Accountant, Administrative Assistant, BIM Specialist, Communications Project Manager, Concrete Manager, Customer Service Representative, Electrical Inspector, Help Desk Manager, Human Resources Generalist, Human Resources Manager, Marketing Coordinator, Medical Equipment Planner, Payroll Specialist, Performance Awareness Manager, Project Accountant, Project Engineer, Project Manager, Quality Control Coordinator, Scheduler, Systems Administrator

Application:

View the Balfour Beatty Construction Application and apply for the Balfour Beatty Construction job you want.

Possible Balfour Beatty Construction Interview Questions:

Prepare for your interview by reviewing the questions below. Think about how you would answer these types of questions.

• What appeals to you about this job?
• What do you like most about workingin construction?
• What do you think accounts for success within Balfour Beatty Construction?
• What types of projects have you worked on?
• Describe what you think a typical day is like for this position
• What do you know about Balfour Beatty Construction
• What factors go into maintaining a safe work environment?
• Tell us about a difficult situation in a previous construction job and how you overcame it

Common Interview Questions:

Prepare with important interview questions and answers.

Do you have Balfour Beatty Construction interview experience?

Care to share any tips, questions, answers or advice with our community? Help our users prepare for the interview by leaving your feedback below.
For example, useful information includes:

• Should I bring anything to the Balfour Beatty Construction interview?
• What education level (high school or college) is required for the job?
• What other questions do they ask? How should you answer certain questions?
• What should I wear, or how should I dress for an interview at Balfour Beatty Construction?
• How much do they pay? Will they ask about salary expectations, if so what should I say?
• Does Balfour Beatty Construction drug test?
• What about second interviews? When should you expect a call after the interview?

Electrical company interview questions

Many times interviews are not about your proficiency as much as they are about how well you can work with others and your underlying motivations. You may get some questions that will determine your common sense and critical thinking. You may be asked rather simple questions about general science such as how does an airplane fly. Not only do they want to see if you know some unrelated science but how well you react to sudden and unexpected questions and how well you answer.

Here are some questions that I have been asked. I also asked some of these when I gave a couple of interviews.

Tell me about one of your accomplishments.

Where did you work before comming here. Why did you leave, Why are you looking to leave.

Are you willing to travel, or relocate?

What can you tell us about our company? Why do you want to work for us? 

Describe your perfect job

Have you ever given a presentation? To how many people...

Describe a suggestion you made to fix a problem which was not used. How did that make you feel? What was the result.

Describe a unique solution to a problem that you solved.
Describe a solution to a problem that you opposed but worked anyway. Why did you oppose it.

The Empire District Electric Company Interview Questions

The Empire District Electric Company uses the interview process to screen skilled and knowledgeable associates. As a leader in the utility industry, The Empire District Electric Co offers a host of jobs, and each job involves a unique interview process. Job hopefuls may participate in skills tests, personality exams, phone interviews, 1:1 interviews, panel interviews, and presentations. In an Empire District Electric Company job interview, an interviewer generally asks traditional, behavioral, and scenario questions. At the conclusion of The Empire District Electric Co interview process, applicants may need to submit to drug screening and criminal background checks.
Show up early to The Empire District Electric Company job interview. Dress professionally and bring a resume. Attend the interview with a strong knowledge of the company and services offered. Demonstrate knowledge of The Empire District Electric Co whenever possible. The Empire District Electric Company wants to hire associates familiar with the business. If possible, talk about work experience in the utility industry. If lacking experience, show a passion for job and a desire to work with The Empire District Electric Co. Exhibit a positive and enthusiastic attitude throughout The Empire District Electric Co interview process. Provide clear and concise answers for all The Empire District Electric Company interview questions. Conclude the interview with a firm hand shake and thank The Empire District Electric Co interviewer for the opportunity. A day or two after The Empire District Electric Company interview, send a thank-you not to the interviewer.

Positions:

The Empire District Electric Company typically hires for the following positions:
Accountant, Benefits and Compensation Coordinator, Business Analyst, Financial Analyst, Human Resources Coordinator, Human Resources Manager, Project Engineer, Project Manager, Project Technician, Software Developer, System Administrator, Systems Analyst, Tax Analyst

Application:

View the The Empire District Electric Company Application and apply for the The Empire District Electric Company job you want.

Possible The Empire District Electric Company Interview Questions:

Prepare for your interview by reviewing the questions below. Think about how you would answer these types of questions.

• What is the hardest problem you have had to solve?
• What is your strongest technical skill?
• How would you handle an angry customer?
• What do you consider to be a major hazard of this job?
• How do you perform in stressful situations? What do you do to stay focused during emrgencies?

Common Interview Questions:

Check out these typical interview questions and answers used by many interviewers.

Did you interview with The Empire District Electric Company? Know how to get a job with The Empire District Electric Company?

Help our users prepare for an interview by sharing any tips and advice below. Go ahead and leave a comment. Thanks!
For example, useful information includes:

• Should I bring anything to the The Empire District Electric Company interview?
• What education level (high school or college) is required for the job?
• What other questions do they ask? How should you answer certain questions?
• What should I wear, or how should I dress for an interview at The Empire District Electric Company?
• How much do they pay? Will they ask about salary expectations, if so what should I say?
• Does The Empire District Electric Company drug test?
• What about second interviews? When should you expect a call after the interview?

Electrical Drafter Free Sample Resume

• Use computer-aided drafting equipment and conventional drafting stations, technical handbooks, tables, calculators, and traditional drafting tools such as boards, pencils, protractors, and T-squares.
• Confer with engineering staff and other personnel to resolve problems.
• Draft working drawings, wiring diagrams, wiring connection specifications or cross-sections of underground cables, as required for instructions to installation crew.
• Draw master sketches to scale showing relation of proposed installations to existing facilities and exact specifications and dimensions.
• Measure factors that affect installation and arrangement of equipment, such as distances to be spanned by wire and cable.
• Assemble documentation packages and produce drawing sets which are then checked by an engineer or an architect.
• Review completed construction drawings and cost estimates for accuracy and conformity to standards and regulations.
• Prepare and interpret specifications, calculating weights, volumes, and stress factors.
• Explain drawings to production or construction teams and provide adjustments as necessary.
• Supervise and train other technologists, technicians and drafters.

Electrical Engineering Internship Advice

Electrical engineering internships include an interesting range of roles for advanced electrical engineering students. They offer a significant variation in types of work, and are particularly useful for gaining practical experience in preferred specializations.

This practical experience is valuable, because it includes current commercial applications of skills. One of the problems in any technology related field of study is that studies are normally behind industry practice. Employers have to look at training needs in these areas, and naturally prefer experienced people. At entry level, the experience of up to date technology and industrial methods provided by internships is a real advantage.

Finding an internship
The degree of variation in available internships means you'll also need to shop around to find appropriate roles for your career. That can be a time consuming, frustrating, process.  If you want to become a systems electrical engineer, you need to locate local internship providers in that field.

The internet job boards aren't necessarily the best option for finding actual internships. A search of electrical engineering firms in your area will definitely help locate employers. Even if an employer doesn't offer what you need, professional trades people have excellent networks, and can always advise. Professional associations are also good sources of current information.

Electrical Engineering Interview Questions

Electrical engineering is an engineering discipline that deals with the study, understanding and application of electronics, electricity and electromagnetism. This field has become a specialized occupation during late 19^thcentury following commercialization of electrical power and electric telegraph supply. Electrical engineering today includes a wide variety of subfields, such as electronics, power, signal processing, telecommunications and control systems.

This field of engineering is considered to be dealing with the issues associated with systems like electrical machines and power transmission.

Following are some sample interview questions on Electrical Engineering:

1. What is the difference between electronic regulator and resistance regulator of a fan?
2. What are the main Electrical IS rules?
3. Define watt
4. What happens when dc volt is applied across transformer?
5. What is meant by power prodor?
6. Define EDGE
7. How to cool a 100 MVA transformer?
8. Define power factor
9. Can you convert ac motor into dc and vice versa?
10. How can you detect the right location of the fault when a cable is punctured?
11. What is the difference between neutral and earth
12. Define DIV. What does 50A/DIV or 100V/DIV mean?
13. Can you increase voltage level without transformer?
14. What is the resistance between earth neutral?
15. What is Demand Side Management (DSM)?
16. What is the principle of a transformer?
17. Define Signal
18. Define surge arresyor
19. Define isolation transformer
20. What is the purpose of a choke in a tube light?
21. Why don’t we use transistors as switching devices?
22. What is the difference between P controller, PI controller and PID controller?
23. Why can’t we use capacitive load?
24. Define AMPS
25. What is the difference between grounding and earthing?
26. Define thyristor
27. What is the difference between MKS and CGS systems?
28. How do we rate transformer in KVA?
29. Define flyback convertor
30. Define GSM
31. What is the difference between active and reactive powers?
32. What is the difference between attenuation and noise?
33. Why does current drawn from a source increase while the load is increased?
34. How is energy stored on electron level in an inductor?
35. What is an application?
36. Define Transducer
37. What is the difference between a stabilizer and a regulator?
38. What is the difference between technology and engineering?
39. What is meant by capacitance?
40. Why do we use carbon brush, and why not a copper brush in dc motors?
41. What happens when DC is given to an induction motor?
42. How can you stimulate an induction motor?
43. Dfine reactance and capacitance
44. Why do generators generate just sinusoidal waves?
45. What does SKIN effect mean in electrical circuits?
46. Define induction motor
47. Define Particle Swam Optimization
48. Define GPRS
49. What is the difference between rheostat and potentiometer?
50. Define Ciphering

Basic Electrical Questions

Electrical Engineering Interview questions:

1-What are the most commonly used semiconductor materials?

Silicon (Si) and germanium (Ge)

2 -What device that passes current in one direction only?

Diode

3- Can you name different types of flip-flops?

D, T, R-S, and J-K.

4 - What is the voltage gain or transfer function of amplifier?

Vout/Vin

5- What types domain of Laplace transforms? What behavior can Laplace transform predict how the system work?

Types domain of Laplace transforms is s-domain, Laplace transforms provide a method to find position, acceleration or voltage the system will have.

6-What is “pu” in EE?

Pu stands for per unit in power system. (pu = actual value/ base value)

7-What does quality factor depend on in resonance?

Quality factor q depends on frequency and bandwidth.

8-What is the other name for short circuit?

A fault.

9- Name power losess in rotating electrical machines.

Power losess in rotating electrical machines are Copper losses, core losses, mechanical losses and stray losses.

Questions for you:

What types of I/O have you designed? What were their size? Speed? Configuration? Voltage requirements? Process technology?

What products have you designed ?

What are most challenging engineering project that you have been involved with?

What new engineering specialty skills have you developed?

What do you think you will be doing in engineering ten years from now?

Solve Question paper and Interview question & Answer for BHEL

BHEL (Bharat Heavy Electricals Limited) QUESTION PAPER and INTERVIEW QUESTION ANSWER, if you are preparing for BHEL entrance exam defiantly it may help you.This is a Solved Previous Year Question Paper for BHEL .I hope that this will help you lot prepare for the exam .

The exam contains 240 questions.

120 from Technical Side (60 from Electrical Engg & 60 from General Engg) 
120 from Non Technical Side (35 from English, 35 from Aptitude & 50 from Maths) 

Technical Paper is purly Numerical Based and contains the questions like below: 

Electrical Engg paper has around 1) 15 Questions from Electrical Machines out of this 10 numericals. 
2) 8 Numericals  from Control System 
3) 4 Numericals from Instrumentation 
4) 15 Questions from Electrical Power out of this 8 numericals 
5) 8 Questions from Circuit and field theory 
6) 10 Questions from Electronics (Power & Digital) 

General Engg paper has around 
1) 35 Questions from mechanical engg 
2) 15 Questions from Physics 
3) 10 Questions from other general engg  
Non Technical paper is very easy.  
To solve this paper, speed contains an important factor. We have only 35 seconds to solve a question. 
So be fast and All the Best

BHEL Placement Paper:

1)Unit of Entropy (J/kg K or kJ/kg K)?

2)A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is the resistance force given by sand?

3)Ratio of specific heats of air ? (1.41)

4)A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid ?

5)Two cars travell in same direction at 40 km/hr at a regular distance. A car comes in a opposite direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?

6)A simple problem involing in hoops stress. For sphere: M= [3/2]*p*V* [density of pressure vessel material/Maximum working stress it can tolerate] For Thin walled pressure walls: Hoops stress or stress in the radial direction =p*r/2t?

7) A problem in force calculation in a body moving in a inclined surface?

8)Composition of bronze? 
ans. Copper+zinc.

9) Compostion of stainless steel.? 
ans. iron+chromium+nickel+carbon.

10) CI is manifactured in which process? 
ans. cupola process

11)What percentage of carbon is preset in pig iron? 
ans. 4.5 to 6%.

12)Water is available at 10m height. What is the pressure available? 
ans= pressure=density*g*height; 
p=1000*9.81*10; 
p=98100N/m2.

13)What will happen if the speed of the centrifugal pump doubles?

14)The unit eV is widely used in ? 
ans. Nuclear and atomic physics.

15)What will happen to the resistance, when the diameter of the conductor is doubled?

16)The power comsumed by a electrical device is 1000W at 250V, What is the resistance in the device? 
ans. Power= Voltage*current, 
Current=Power/Voltage, 
Current,I=1000/250=4 
amps. V=IR, 
Therefore R=250/4=62.5 ohms.

17)Why DC current is not used in transformer?

18)On what principle the sonar/ radar works?

19)Bending moment diagram for the UDL is in what shape?

20)Function of the distributor in petrol vehicles? 
ans. Spark timing.

21)Which is not present in CI engines? 
ans. carburrettor.

22)What will happen if one cylinder recieves more amount of fuel spray from injectors than other injectors?

23)Purpose of draft tube in hydraulic turbines?

ans. The purpose of a draft tube is toconvert some of the kinetic energy of the flow from the runner (the rotating part of the turbine) intopressure energy and thereby increase the efficiency ofthe hydro power turbine.

24)What is the effect or reheater in the gas turbine?

The advantage of reheater is significantly increased thrust; the 
disadvantage is it has very high fuel consumption and inefficiency.

25)Problems involving with fricition coefficient.

26)Factor of safety = Yeild stress/Working stress.

27)Which is the example of non parallel power transmission (Universal coupling)?

28)For perpendicular shafts worm gear is used?

29)A planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are connected using a arm. How many rotations are needed for planet gear to complete one rotation around the sun gear?

30)What is equivalent spring constant for spring in parallel?

31) Some questions was asked related to boundary layer and vortex flow.

32) 5 questions were asked in PERT, Process planning, Product planning, Break even analysis.

33)How are tungsten and sintered composite materials are machined? 
(Electro Discharge Machining, EDM)

BHEL Placement Papers (2008)

1. The ratio of two specific heats of air is equal to. = 1.41

2. A perfect gas at 270C is heated at constant pressure till its volume is double. The final temperature is = 3270C

3. An engine operates between temperature of 9000K and T2 and another engine between T2 and 8000K. For both to do equal work, value of T2 will be. = 6500K

4. Internal energy of a substance depends on = Temperature

5. Work done in compressing 1kg of gas adiabatically from p1,V1,T1 to p2, V2, T2 is equal to = Cv(T2-T1)

6. The unit of entropy is = J/kg 0K

7. Indicated power of a 4-stroke engine is equal to = pLAN/2

8. Which of the following is not an internal combustion engine : a) 2 stroke petrol engine b)4 stroke petrol engine c) Diesel engine d) steam engine e) Gas turbine. = (d)

9. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the: a) exhaust will be smoky b) piston rings would stick into piston grooves c) exhaust temperature will be high d) engine starts overheating e) all of the above. = (e)

10. The spark plug gap is normally maintained at: = 0.45 to 0.6mm

11. A distributor in spark ignition engines performs the function of : = Providing the correct firing order in engine

12. Which of the following does not relate to C.I. engine:: a) fuel pump b) fuel injector c) governor d) carburetor e) flywheel = (d)

13. Air fuel ratio in a jet engine is = 60:1

14. What is the value of Prandtl No.?

15. In domestic refrigerator, the tubes at the back of the refrigerator are: a) evaporator b) condenser c) capillary tubes d)………

16. Which refrigerants has the highest critical point temperature. = Freon-11

17. Wet bulb temperature is. = indication of amount of moisture in air

18. On psychrometric chart, dry bulb temperature lines are. = Vertical

19. Surface tension has the units. = newtons/m

20. The line of action of the buoyant force acts through the. = centroid of the displaced volume of fluid

21. A pressure of 25m of head of water is equal to. =245kN/m2

22. For a submerged body to be in stable equilibrium, the centre of gravity should be. =Below the centre of buoyancy.

23. The actual velocity at vena contracta for flow through an orifice from a reservoir of height H=?. =Cvv2gH

24. A body weighing 2kg in air weights 2.5kg when submerged in water. Its specific gravity is. = 6

25. In a free vortex motion: = each particle moves in a circular path with a speed varying inversely as the distance from the centre.

26. A centrifugal pump has speed-1000rpm, Flow-1200l.p.m, Head-20m, Power-5H.P. If its speed is increased to 1500rpm, new flow will be.: = 1800l.p.m

27. Runaway speed of a hydraulic turbine is: = the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open.

28. 10m of water column is equal to = 100kN/m2

29. M.I. of a circular area about an axis perpendicular to the area is: = pr4/2

30. A projectile is fired at an angle ? to the vertical. Its horizontal range will be maximum when ? is . =450

31. An elevator weighing 1000kg attains an upward velocity of 4m/sec in two seconds with uniform acceleration. The tension in the supporting cables will be = 1200kg.

32. A 13m ladder is placed against a smooth vertical wall with its lower end 5m from the wall. What should be the co-efficient of friction between ladder and floor so that it remains in equilibrium. = 0.21

33. A car is moving with a velocity of 60km/hr and possesses energy of 5×105 joules. The mass of the car will be. =3000kg.

34. If l is the span of a light suspension bridge whose each cable carries total weight (w) and the central diop is y, the horizontal pull at each support is: = wl/y OR

35. A beam of length l, having uniform load w kg/unit length is supported freely at the ends. The moments at mid span will be: = wl2/8.

36. A boiler shell 200cm dia and plate thickness 1.5cm is subjected to internal pressure of 1.5MN/m2, then the hoop stress will be. = 100N/m2

37. 100KW is to be transmitted by each of two separate shafts. A is turning at 250rpm and B at 300rpm. Which shaft must have greater diameter.: = B

38. Two identical leaf springs of spring constant k are arranged like cantilevers in parallel and attached at free end by a spring of spring constant k. The equivalent spring constant of combination is; = 1.5k.

39. Automobile steering gear is an example of: = lower pair.

40. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is. = Universal coupling.

41. To transmit power from one rotation shaft to another whose axes are neither parallel nor intersecting, use: = Spiral gear.

42. A gear having 100 teeth is fixed and another gear having 25 teeth revolves around it, the centre lines of both gears being joined by an arm. How many revolutions will be made by gear of 25 teeth for one revolution of arm. = 5 rev.

43. The secondary critical speed of a shaft occurs at: = twice the speed of primary critical speed.

44. Brittle coating technique is used for: = experimental stress analysis.

45. Factor of safety is the ratio of: = yield stress/working stress.

46. Type of gear used for non-intersection perpendicular shafts: = Hypoid gears.

47. Corrosion resistance of steel is increased by adding: = Chromium & Nickel

48. The product of Cupola is called: = cast iron

49. Brinell tester uses a hardness steel ball of size: = 10mm

50. Sintered and tungsten carbides can be machined by: = EDM

51. What kind of abrasive cut off wheel should be used to cut concrete, stone and masonry? =Diamond grit.

52. In break-even analysis, total cost consists of: = Fixed cost + Variable cost.

53. The amount deducted from the salary of workers towards employees provident fund is : =deposited in the account of worker with Provident Fund Commissioner.

54. PERT is: = event oriented technique

55. Bar charts are suitable for: = minor works.

56. ? on a PERT/CPM chart represents: = a significant event representing some mile-stone

57. Electron volt is the unit of : = Energy.

58. Seamless tubes are made by?

59. Reheating in gas turbine results in: = increase of work ratio and decrease of thermal efficiency.

60. Why DC current is not used in transformer?

61. What is the purpose of draft tube in hydraulic turbines: = to convert the kinetic energy into pressure energy.

62. A mass of 100kg is falling from a height of 1m and penetrates the sand to 1m. what is the resistance force of the sand?

63. Two cars travel in the same direction at 40km/hr at a regular distance. A car comes in the opposite direction at 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between the two cars?