Electrical Communication Engineering interview questions

• Questions mostly on control circuits & stability issues.
• Basics of VSi (Voltage sourse inverter) in details , its wave form for various types of loads, its analysis for different modes of conduction.
• Devices(power electronic), their characteristics eg. Difference between a signal and power mos
• Bundle conductors, corona losses, surge impedance
• Induction motor T-S characteristics, Synchronous motors and generators, applications of dc motors.
• They gave different references & inputs to comparator and ask about the output.
• They asked circuit diagram of buck, buck-boost and various wave forms.
• They gave some circuit in which there was freewheeling diode and asked about its operation in detail.
• Equivalent diagram of induction motor and significance of different elements in equivalent diagram.
• On stability analysis (power system)…. They gave a circuit in which a single line to ground fault had occurred. They asked to draw the swing curve, indicate accelerating and deccelerating areas, asked how rotor angle is increased physically, what is the physical meaning of accelerating and deccelerating areas.
• Explain Ferranti effect. They asked in very detaile abot Ferranti effect.
• Why hydel power generators rotate at slower speed than thermal (steam) generators?
• Questions on load-flow studies & electric drives, from the basics but tricky.
• One of the Profs drew a circuit of dc-dc converter and asked to identify that. Be very clear about buck, buck-boost, boost converters, inverters.
• In control system they asked very basic questions of bode plot, nyquist, polar plot and asked to draw them with a given transfer function (not very tough).
• They’ll first ask your area of interest. Depending on that they’ll ask queations on that field and related fields. Nevertheless, prepare for the whole syllabus.
• They’ll ask you to answer each question by drawing circuit, writing equations...etc……on the black board.