electrical engineering MCQs – Page 140

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 Review each marked answer and report any item that may be outdated or unclear.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
2781. If the input to an integrating circuit is a succession of alternating positive and negative pulses of very short duration, the output will be _____________wave A?
comments icon0

A. Triangular

B. ectangular

C. Sine

D. Square
2782. The load voltage is approximately constant when a Zener diode is ________________?
comments icon0

A. Forward biased

B. Operating in the breakdown region

C. Reverse biased

D. Unbiased

2783. ___________ ICs are the most commonly used?
comments icon0
A. Monolithic

B. None of the above

C. Thin films

D. Hybrid

2784. The input impedance of a JFET is _____________that of an ordinary transistor?
comments icon0

A. less than

B. none of the above

C. more than

D. equal to

2785. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?
comments icon0
A. Cast iron

B. Cast steel

C. Soft steel

D. Aluminium

2786. In class A operation, the input circuit of a JFET is ____________ biased?
comments icon0

A. forward

B. reverse

C. not

D. none of the above

2787. The current in a Zener diode is limited by _______________?
comments icon0

A. External resistance

B. Power dissipation

C. Both (A) and (B)

D. None of the above

2788. Yokes with rectangular cross-section are used for_______________?
comments icon0

A. large capacity transformers

B. medium capacity transformers

C. any of the above

D. small capacity transformers
2789. In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?
comments icon0

A. 10 percent

B. none of the above

C. 5 percent

D. 15 percent

E. 30 percent

2790. The rupture of co-valent bonds will occur when the electric field is__________________?
comments icon0

A. 6 V/cm

B. 100 V/cm

C. More than 105 V/cm

D. 1000 V/cm

2791. A Zener diode______________?
comments icon0

A. Is a battery

B. Is forward biased

C. Has a barrier potential of 1 V

D. Acts like a battery in the breakdown region
2792. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made____________?
comments icon0

A. equal to that of armature mmf

B. less in comparison with the armature mmf

C. large in comparison with the armature mmf

D. none of the above

2793. The most popular form of IC package is _____________?
comments icon0
A. Flatpack

B. DIL

C. None of the above

D. TO-5

2794. The operation of a D.C. machine with large air gap lengths is comparatively_____________?
comments icon0

A. either of the above

B. none of the above

C. noisy

D. quiet
2795. The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?
comments icon0

A. air

B. none of the above

C. hydrogen

D. either A. or B.

2796. A bistable multivibrator has _________________?
comments icon0

A. No stable state

B. None of the above

C. Two stable states

D. One stable state

2797. If the full-scale deflection current of a multimeter is 50 A, its sensitivity is ________________?
comments icon0

A. 10 kO/V

B. 50 kO/V

C. 100 kO/V

D. 20 kO/V
2798. ICs are used in ______________?
comments icon0

A. Linear devices only

B. Digital devices only

C. Both linear and digital devices

D. None of the above

2799. The gate voltage in a JFET at which drain current becomes zero is called ______________ voltage?
comments icon0
A. pinch-off

B. cut-off

C. saturation

D. active

2800. The two important advantages of a JFET are _________________?
comments icon0

A. low input impedance and high output impedance

B. inexpensive and high output impedance

C. high input impedance and square-law property

D. none of the above