electrical engineering MCQs – Page 201

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4001. The relay with inverse time characteristic will operate within____________?
0

A. none of the above

B. 5 to 20 sec

C. 5 to 10 sec

D. 1.5 sec

E. 20 to 30 sec

4002. transmission line has reflection coefficient as one?
0

A. Open circuit

B. None of the above

C. Long

D. Short-circuit

4003. Overheating of relay contacts or contact born out is due to_______________?
0

A. all of the above

B. foreign matter on the contact surface

C. slow making and breaking of load circuit contacts

D. too low contact pressure

4004. The voltage appearing across the contacts after opening of the circuit breaker is called__________voltage
0

A. recovery

B. none of the above

C. surge

D. arc

E. operating

4005. Magnetic circuit breaker has ___________ trip action
0

A. delayed

B. instantaneous

C. both of the above

D. none of the above

4006. The fuse wire, in D.C. circuits, is inserted in____________?
0

A. negative circuit only

B. positive circuit only

C. both (A) and (B)

D. either (A) or (B)

4007. Large internal faults are protected by_______________?
0

A. earth fault and positive sequence relays

B. horn gaps and temperature relays

C. mho and ohm relays

D. merz price percentage differential protection

4008. The material used for fuse must have_____________?
0

A. low melting point and any specific resistance

B. low melting point and -low specific resistance

C. low melting point and high specific resistance

D. high melting point and low specific resistance

4009. The arc voltage produced in A.C. circuit breaker is always_____________?
0

A. none of the above

B. in phase with the arc current

C. lagging the arc current by 90?

D. leading the arc current by 90

4010. A differential relay measures the vector difference between_________________?
0

A. two currents

B. two or more similar electrical quantities

C. two voltages

D. none of the above

4011. Wave trap is used to trap waves of__________________?
0

A. power frequencies

B. higher frequencies entering generator or transformer units

C. either of the above

D. none of the above

4012. The time of closing the cycle, in modern circuit breakers is_____________?
0

A. 0.10 sec

B. none of the above

C. 0.003 sec

D. 0.01 sec

E. 0.001 sec

4013. The torque produced in induction type relay (shaded pole structure) is_____________?
0

A. inversely proportional to the current

B. proportional to the current

C. proportional to square of the current

D. inversely proportional to the square of the current

4014. An isolator is installed_____________?
0

A. to operate the relay of circuit breaker

B. as a substitute for circuit breaker

C. always independent of the position of circuit breaker

D. generally on both sides of a circuit breaker

4015. How many op-amps are required to implement this equation Vo = V1?
0

A. 3

B. 1

C. 4

D. 2

4016. The closed-loop voltage gain of an inverting amplifier equal to______________?
0

A. The open-loop voltage gain

B. The feedback resistance divided by the input resistance

C. The input resistance

D. The ratio of the input resistance to feedback resistance

4017. An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
0

A. 5/2 volts

B. 10 volts

C. 5/ volts

D. 5 volts

4018. The two input terminals of an opamp are labeled as______________?
0

A. High and low

B. Inverting and non inverting

C. Differential ans non differential

D. Positive and negative

4019. In the above circuit the current ix is___________?
0

A. 1/12A

B. 0.5A

C. 0.2A

D. 0.6A

4020. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
0

A. Av / Ac

B. Av + Ac

C. Ac / Av

D. 1 + Av / AC.

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