electrical engineering MCQs – Page 230

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 Review each marked answer and report any item that may be outdated or unclear.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

4581. The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
0

A. 1

B. 3

C. 3-Jan

D. 6

4582. Which of the following is unit of inductance ?
0

A. Webers/metre

B. Ampere turns

C. Ohm

D. Henry

4583. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
0

A. 0.03125 volt

B. 0 volt

C. 31.25 volt

D. 3.125 volt

4584. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?
0

A. ?B(r2-r1)2/?t

B. ?B/r22-r12/?t

C. ?B(r22+r12)/?t

D. ?B(r22-r12)/?t

4585. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?
0

A. capacitance

B. series aiding inductance

C. mutual inductance

D. self-inductance

4586. Which circuit element(s) will oppose the change in circuit current ?
0

A. Capacitance only

B. Inductance only

C. Resistance only

D. Inductance and capacitance

4587. A.C cannot be used for________________?
0

A. producing light

B. producing heat

C. magnetizing and electroplating

D. all the above

4588. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?
0

A. 48mH

B. 24mH

C. 12 mH

D. 3 mH

4589. Current produced by moving the loop of wire across a magnetic field is called_____________?
0

A. mean square current

B. A.C current

C. D.C current

D. induced current

4590. Which of the fpllowing inductor will have the least eddy current losses ?
0

A. Powdered iron core

B. Laminated iron core

C. Iron core

D. Air core

4591. Two 300 uH coils in series without mutual coupling have a total inductance of___________?
0

A. 150 uH

B. 300 uH

C. 600 uH

D. 75 uH

4592. Which one of the following devices does not function like an electric motor ?
0

A. Voltmeter

B. Ammeter

C. Transformer

D. Galvanometer

4593. The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?
0

A. Reduces the effect of eddy current

B. Increases the mutual inductance between the solenoid and the core

C. Improves the flux linkage between the turns of the coil

D. Decreases the resistance of the solenoid

4594. Magnetic compass needle will be deflecting if it is kept near________________?
0

A. Accelerating charge

B. Soft iron

C. Static charge

D. Semi-conductor

4595. Transformer works on the principle of________________?
0

A. Law of conservation of power

B. Mutual induction

C. Lenzs law

D. Faradays law

4596. When the motor is at its maximum speed then back emf will be______________?
0

A. Zero

B. Maximum

C. No back emf

D. Intermediate values

4597. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
0

A. 1000 N

B. 600 N

C. 400 N

D. 100 N

4598. A crack in the magnetic path of an inductor will result in________________?
0

A. reduced inductance

B. zero inductance

C. increased inductance

D. unchanged inductance

4599. In case of an inductance, current is proportional to___________?
0

A. voltage across the inductance

B. magnetic field

C. both A. and B.

D. neither (A) nor (B)

4600. The magnitude of the induced e.m.f. in a conductor depends on the______________?
0

A. flux density of the magnetic field

B. amount of flux linkages

C. rate of change of flux-linkages

D. amount of flux cut

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