Interview Questions for an Electrical Engineer/Circuit Designer?

Depends on the level. Here is what I would ask and answers for these I know.
1. If thevenin equivalent of a circuit is 5V and short circuit current is 1 amp, what is thevenin resistance? Ans: 5 ohms
2.What is superpositin theorem? Ans: the output due to various sources is the sum of individual contributions from each source with other sources replaced by their equivalent resistance: 0 for voltage source, infinite for current source.
3.Can one use op amps as amplifiers when they work with single supply? Ans: Yes. they should be typically biassed to provide output of half the supply voltage.
4. Differentiate between offset and drift. Ans: Offset can be corrected for at room temperature. After that any variation of offset is called drift.
5. What is slew rate? Ans: The maximum rate at which the op amp output can change, given as xxx v/uS
6. What isthe mains voltage? Ans: 230V
7. is it peak, or rms or peak to peak? Ans: rms
8. In 3 phase, what will be the line to line voltage if line to neutral is 230V? Ans: 230*sqrt(3)= 400V
9. If the chassis of an electrical equipment is connected to safety ground what will be the current in it? Ans: normally zero. Current will be present only if there is a fault in the equipment.
10. What is the typical regulation of a 50VA transformer: Ans:5 to 10%
11. What is voice bandwidth? Ans: 300 to 3400 hz.
12. What is PCM? Ans: Pulse code modulation
13. How is temperature sensed; Ans: using thermocouples, RTD's solid state sensors or thermistors.
14. How is direction of rotation of a shaft identified? Ans: Using quadrature sensors.
15. What is a microcontroller? ans: it is a microprocessor with built in I/Os, RS 232 or other interfaces, timers and memory
Other expectations: If this engineer is expected to do analog / digital design, he should be familiar with the following:
1. A precision absolute value circuit
2. An instrumentation amplifier and its advantages
3. A single op amp square wave oscillator/ a two op amp triangle / square wave oscillator
4. Active filters: Sallen and key realisation of 2nd order Butterworth
5. Current sources and their applications in IC's
6. Bandiwdth of op amps.
7. DC errors in op amps
8. PLL, and its gimmicks: Lock range and capture range
9. Some background on control systems: On Off type, PID type etc
10. DSP: FIR and IIR filters.
You may get answers for this if you google these topics. 
Discover circuits is a useful resource. Another: