electrical engineering MCQs – Page 62

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 Review each marked answer and report any item that may be outdated or unclear.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

1221. If load (or torque) angle of a 4-pole synchronous motor is 6 electrical, its value in mechanical degrees is__________?
0

A. 6

B. 4

C. 3

D. 2

1222. ___________ is invariably used as base load plant.
0

A. Pumped storage plant

B. Nuclear power plant

C. Diesel engine plant

D. Gas turbine plant

1223. A non-linear network does not satisfy__________?
0

A. superposition condition

B. homogeneity condition

C. both homogeneity as well as superposition condition

D. homogeneity, superposition and associative condition

1224. Maximum demand on a power plant is_________________?
0

A. the greatest of all short time interval averaged demand during a period

B. instantaneous maximum value of kVA supplied during a period

C. both A. or B.

D. none of the above

1225. The period of a wave is___________?
0

A. the same as frequency

B. time required to complete one cycle

C. expressed in amperes

D. none of the above

1226. If a shunt motor is started with its field winding open then___________?
0

A. None of these

B. It will rotate at dangerously high speed

C. It will rotate at the same speed as that with its field winding closed

D. It will rotate at less speed as that with its field winding closed

1227. Static capacitors are rated in terms of_____________?
0

A. kWh

B. none of the above

C. kW

D. kVAR

1228. A synchronous motor is running with normal excitation. When the load is increased, the armature current drawn by it increases because
0

A. Eb (back e.m.f.) becomes less than V (applied voltage)

B. Er (net resultant voltage) in armature is increased

C. power factor is decreased

D. speed of the motor is reduced

E. none of the above

1229. In Hopkinson demand rate or two part tariff the demand rate or fixed charges are__________?
0

A. dependent upon the energy consumed

B. dependent upon the maximum demand of the consumer

C. both A and B

D. neither A nor B

1230. Kirchhoff s voltage law applies to circuits with____________?
0

A. linear elements only

B. nonlinear elements only

C. linear, non-linear, active and passive elements

D. linear, non-linear, active, passive, time varying as wells as time-in-variant elements

A. Identical to line current in VSI

B. Identical to phase voltage in VSI

C. Identical to phase voltage in CSI

D. Identical to line voltage in a VSI

1232. __________ will be least affected due to charge in supply voltage frequency.
0

A. Electric clock

B. Mixer grinder

C. Room heater

D. Ceiling fan

1233. If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then_____________?
0

A. the back e.m.f. will be more than the supply voltage

B. the stator current will be very small

C. none of the above

D. the stator current will be zero

E. the stator current will be very high

1234. A load curve indicates___________?
0

A. average kWh (kW) energy consumption during the period

B. either of the above

C. average power used during the period

D. none of the above

1235. Air will not be the working substance in which of the following?
0

A. Petrol engine

B. Diesel engine

C. Closed cycle gas turbine

D. Open cycle gas turbine

1236. Which of the following is not a source of power?
0

A. Solar cell

B. Thermocouple

C. Photoelectric cell

D. Photovoltaic cell

1237. Annual depreciation as per straight line method, is calculated by__________?
0

A. none of the above

B. the capital cost divided by number of year of life

C. the capital cost minus the salvage value, is divided by the number of years of life

D. increasing a uniform sum of money per annum at stipulated rate of interest

1238. When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?
0

A. equal

B. less

C. more

D. twice

1239. Under which of the following conditions hunting of synchronous motor is likely to occur?
0

A. Periodic variation of load

B. Over-excitation

C. Small and constant load

D. Over-loading for long periods

1240. The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?
0

A. 90

B. 60

C. 180?

D. 0

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