electrical engineering MCQs – Page 72

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 Review each marked answer and report any item that may be outdated or unclear.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

1421. Power plant having maximum demand more than the installed rated capacity will have utilization factor?
0

A. none of the above

B. more than unity

C. less than unity

D. equal to unity

1422. Between the branch voltages of a loop the Kirchhoff s voltage law imposes_____________?
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A. non-linear constraints

B. no constraints

C. linear constraints

D. none of the above

1423. The peak value of a sine wave is 200 V. Its average value is___________?
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A. 282.8 V

B. 200V

C. 127.4 V

D. 141.4 V

1424. The area under a load curve gives__________?
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A. none of the above

B. maximum demand

C. energy consumed

D. average demand

1425. In a series parallel circuit, any two resistances in the same current path must be in___________?
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A. series with each other

B. series with the voltage source

C. parallel with each other

D. parallel with the voltage source

1426. Which of the following devices may be used to provide protection against lightening over voltages?
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A. Surge absorbers

B. All of the above

C. Horn gaps

D. Rod gaps

1427. The coupling angle or load angle of synchronous motor is defined as the angle between the__________?
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A. rotor and stator teeth

B. rotor and the stator poles of the same polarity

C. rotor and the stator poles of opposite polarity

D. none of the above

1428. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always____________?
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A. positive

B. zero

C. negative

D. determined by battery e.m.fs.

1429. The circuit whose properties are same in either direction is known as__________?
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A. irreversible circuit

B. bilateral circuit

C. unilateral circuit

D. reversible circuit

1430. Low power factor is usually not due to___________?
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A. incandescent lamp

B. fluorescent tubes

C. induction motors

D. arc lamps

1431. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be___________?
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A. a voltage source

B. a current source

C. both of above

D. none of the above

1432. In a synchronous motor, V-curves represent relation between____________?
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A. field current and speed

B. field current and power factor

C. armature current and field current

D. power factor and speed

1433. In a synchronous motor, damper windings are provided on____________?
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A. pole faces

B. rotor shaft

C. none of the above

D. stator frame

1434. Choose the incorrect statement: A branch formed by the parallel connection
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A. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

B. A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

C. A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

D. A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

1435. A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
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A. the motor will stop

B. none of the above

C. the motor will run in the reverse direction

D. the motor continue to run in the same direction

E. the winding of the motor will burn

1436. Load curve helps in deciding___________?
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A. sizes of the generating units

B. total installed capacity of the plant

C. operating schedule of generating units

D. all of the above

1437. In a synchronous motor, the damping winding is generally used to______________?
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A. reduce the eddy currents

B. reduce noise level

C. none of the above

D. prevent hunting and provide the starting torque

E. provide starting torque only

1438. Which of the following is an advantage of static capacitor for power factor improvement?
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A. Ease in installation

B. Low losses

C. Little maintenance cost

D. All of the above

1439. The minimum armature current of the synchronous motor corresponds to operation at______________?
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A. 0.707 power factor lagging

B. unity power factor

C. zero power factor leading

D. 0.707 power factor leading

1440. Annual instalment towards depreciation reduces as rate of interest increases with______________?
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A. sinking fund depreciation

B. none of the above

C. reducing balances depreciation

D. straight line depreciation

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