electrical engineering MCQs – Page 232

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 Review each marked answer and report any item that may be outdated or unclear.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
4621. Mutually inductance between two magnetically-coupled coils depends on____________?
comments icon0

A. cross-sectional area of their common core

B. permeability of the core

C. the number of their turns

D. all of the above
4622. Which one of the following functions like a motor ?
comments icon0

A. galvanometer

B. all of above

C. ammeter

D. voltmeter

4623. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
comments icon0

A. 8 H

B. 6 H

C. 12 H

D. 24 H

4624. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
comments icon0

A. 2 Wb

B. 0.2 Wb

C. 20 Wb

D. 0.02 Wb
4625. Which of the following works on torque on the current carrying conductor placed in magnetic field ?
comments icon0

A. ammeter

B. galvanometer

C. voltmeter

D. all of the above
4626. Reversing the field or the current will reverse the force on the conductor
comments icon0
A. Yes

B. No

4627. The polarity of the induced voltage can be determined by using the left-hand generator rule
comments icon0
A. Yes

B. No

4628. For long distance transmission the transformer used is_____________?
comments icon0

A. Input voltage and output voltage remain same

B. Step down

C. Step up

D. Amplifier is used

4629. As per Faradays laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
comments icon0

A. lies in a magnetic field

B. lies perpendicular to the magnetic flux

C. cuts magnetic flux

D. moves parallel to the direction of the magnetic field

4630. A.C can not be used for_______________?
comments icon0

A. producing light

B. Producing magnetic field

C. Magnetizing iron

D. producing heat

4631. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
comments icon0
A. 25V

B. 15 V

C. 50V

D. 10 V

4632. Which of the following uses electric energy and does not convert it into any other form ?
comments icon0

A. motor

B. transformer

C. D.C generator

D. A.C generator

4633. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
comments icon0
A. 38 mH

B. 40 mH

C. 48 mH

D. 32 mH

4634. Weber is the unit of_____________?
comments icon0
A. magnetic flux

B. Magnetic field intensity

C. self-inductance

D. magnetic induction

4635. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
comments icon0

A. 5 s

B. 0.1 s

C. 0.5 s

D. 0.01 s

4636. Which of the following circuit elements will oppose the change in circuit current ?
comments icon0
A. Inductance

B. All of the above

C. Capacitance

D. Resistance

4637. A conductor carries 125 amperes of current under 60 to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
comments icon0

A. 50 N

B. 120 N

C. 480 N

D. 240 N

4638. The emf induced in a coil by a changing magnetic flux may have unit as______________?
comments icon0

A. ms-1A

B. kgm2s-1A-1

C. kgms2A-1

D. ms-2A-1

4639. An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
comments icon0

A. None of the above

B. Back emf

C. Induced current

D. Eddy current
4640. For electroplating we use_________________?
comments icon0

A. any source

B. A D.C source

C. an A.C source

D. all of the above