electrical engineering MCQs – Page 233

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
4641. Higher the self-inductance of a coil_____________?
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A. lower the e.m.f. induced

B. lesser its weber-turns

C. greater the flux produced by it

D. longer the delay in establishing steady current through it
4642. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
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A. 1.5Hzs

B. 1Hzs

C. 106sec

D. 1sec

4643. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
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A. initially increase and then decrease

B. remain the same

C. increase

D. decrease
4644. Self-inductance of a long solenoid is______________?
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A. ?oN2

B. BA

C. ?oN2A

D. ?oN2/A

4645. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
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A. 10 mH

B. 5 mH

C. 5 H

D. 10 H

4646. Self inductance of a coil depends upon________________?
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A. current flowing

B. voltage produce

C. all

D. number of turns per unit length

4647. Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?
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A. Hysteresis

B. Flux

C. Permeability

D. Retaintivity

4648. A.C cannot be used for_______________?
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A. magnetizing and electroplating

B. all the above

C. producing light

D. producing heat

4649. If the coil is wound on an iron core the flux through it will_______________?
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A. remain the same

B. become zero

C. decrease

D. increase
4650. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?
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A. 250 mH

B. 150 mH

C. 3500 mH

D. 350 mH
4651. Inductors acts as a short circuit for_______________?
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A. AC

B. DC

C. Both A and B

D. none of these

4652. For a purely inductive circuit which of the following is true ?
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A. Apparent power is zero

B. Actual power of the circuit is zero

C. Any capacitance even if present in the circuit will not be charged

D. Relative power is.zero

4653. cmf generated by A.C dynamo depends upon_____________?
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A. number of turns in the coil

B. frequency of rotation

C. magnetic field strength

D. all of above
4654. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
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A. variation in coil current

B. variation in voltage to the coil

C. change of number of turns of coil

D. the resistance of magnetic path

4655. The co-efficient of coupling between two air core coils depends on____________?
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A. self-inductance of two coils only

B. mutual inductance and self inductance of two coils

C. mutual inductance between two coils only

D. none of the above

4656. The inductance of a coil will increase under all the following conditions except______________?
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A. when permeability of the core increases

B. when more area for each turn is provided

C. when more length for the same number of turns is provided

D. when the number of turns of the coil increase

4657. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
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A. Vp/Vs = Ns/Np

B. Vp/Vs = Np/Ns

C. Vs/Vp = Ns/Np

D. Vs/Vp = Np/Ns

4658. Lenzs law is a consequence of the law of conservation of__________?
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A. charge

B. induced e.m.f.

C. induced current

D. energy
4659. Long distance transmission is easy for________________?
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A. Half D.C voltage

B. A.C voltage

C. Half A.C voltage

D. D.C voltage

4660. The average value of the output voltage in a step down dc chopper is given by__________?
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A. V 0 = D V s

B. V 0 = V s

C. V 0 = V s / D

D. V 0 = V s / ( 1 D )