electrical engineering MCQs – Page 286

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 Review each marked answer and report any item that may be outdated or unclear.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

5701. Which of the following motors one will choose to drive the rotary compressor ?
0

A. Synchronous motor

B. Universal motor

C. D.C. series motor

D. D.C. shunt motor

5702. In which of the following applications D.C. series motor is invariably tried?
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A. Fan motor

B. Drive for a water pump

C. Motor operation in A.C. or D.C

D. Starter for a car

5703. The starting resistance of a D.C. motor is generally_______________?
0

A. around 500 Q

B. low

C. 1000 Q

D. infinitely large

5704. If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens____________?
0

A. this will make armature to take heavy current, possibly burning it

B. nothing will happen to motor

C. motor will come to stop

D. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

5705. Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?
0

A. D.C. series motor

B. all of above motors

C. D.C. shunt motor

D. induction motor

5706. If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?
0

A. decrease in reactance

B. increase in armature current

C. decrease in back emf

D. increase in flux

5707. The plugging gives the____________?
0

A. smallest torque braking

B. zero torque braking

C. none of the above

D. highest torque braking

5708. When the armature of a D.C. motor rotates, e.m.f. induced is___________?
0

A. none of the above

B. back e.m.f

C. mutually induced e.m.f.

D. self-induced e.m.f.

5709. The armature voltage control of D.C. motor provides____________?
0

A. constant voltage drive

B. none of the above

C. constant current drive

D. constant torque drive

5710. Which method of braking is generally used in elevators ?
0

A. Rheostatic braking

B. Plugging

C. Regenerative braking

D. None of the above

5711. In D.C. motor which of the following can sustain the maximum temperature rise?
0

A. Field winding

B. Slip rings

C. Commutator

D. Armature winding

5712. A three point starter is considered suitable for______________?
0

A. shunt motors

B. shunt as well as compound motors

C. all D.C. motors

D. shunt, compound and series motors

5713. Usually wide and sensitive speed control is desired in case of____________?
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A. steel rolling mills

B. elevators

C. centrifugal pumps

D. colliery winders

5714. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?
0

A. also runs as a motor comes to stop after sometime

B. does not run as a generator

C. runs as a generator

5715. The stabilisation of operating point in potential divider method is provided by_______________?
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A. RC consideration

B. RE consideration

C. None of the above

D. VCC consideration

5716. A silicon transistor is biased with base resistor method. If =100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?
0

A. 530 kO

B. None of the above

C. 315 kO

D. 105 kO

5717. If biasing is not done in an amplifier circuit, it results in________________?
0

A. Unfaithful amplification

B. None of the above

C. Decrease in the base current

D. Excessive collector bias

5718. For faithful amplification by a transistor circuit, the value of VCE should______________for silicon transistor?
0

A. Be zero

B. Not fall below 1 V

C. None of the above

D. Be 0.2 V

5719. The value of VBE ___________________?
0

A. None of the above

B. Is almost independent of IC

C. Is strongly dependant on IC

D. Depends upon IC to moderate extent

5720. For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than_____________?
0

A. 10 IB

B. 3 IB

C. 4 IB

D. 2 IB

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