electrical engineering MCQs – Page 177

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 Review each marked answer and report any item that may be outdated or unclear.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
3521. The output transformer used in a power amplifier is a _____________ transformer?
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A. Step-up

B. None of the above

C. 1:1 ratio

D. Step-down
3522. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________?
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A. -12.04 dB

B. -6.02 dB

C. 12.04 dB

D. 6.02 dB

3523. The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
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A. Pass a.c. and block d.c.

B. Protect the transistor

C. Increase the output impedance of transistor

D. Provide biasing

3524. The pulsating d.c. applied to power amplifier causes________________?
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A. Burning of transistor

B. Excessive forward voltage

C. Hum in the circuit

D. None of the above

3525. A certain voltage divider consists of three 1 k? resistors in series. Which of the following load resistors will have the least effect on the output voltage?
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A. 1 M?

B. 330 ?

C. 100 k?

D. 1 k?

3526. The phase difference between the output and input voltages of a CE amplifier is _____________?
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A. 90o

B. 180o

C. 0o

D. 270o

3527. _____________coupling provides the maximum voltage gain?
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A. Transformer

B. Impedance

C. RC

D. Direct

3528. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
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A. 1/4th of its original value

B. 1/8th of its original value

C. 4 times of its original value

D. 8 times of its original value

3529. If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?
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A. 5 k?

B. 10 k?

C. 20 k?

D. 2 k?

3530. The first goal to accomplish in analyzing a complex series-parallel circuit is to____________?
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A. solve for the total current and resistance

B. equate all parallel components

C. solve for all the voltage drops

D. equate all series components

3531. If mica sheet is placed between the plates of a capacitor the capacity_______________?
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A. increases then decreases

B. decreases then increases

C. increases

D. decreases

3532. Inductors acts as a short circuit for_______________?
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A. AC

B. DC

C. Both A and B

D. none of these

3533. The size of a power transistor is made considerably large to________________?
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A. Facilitate connections

B. Provide easy handling

C. Dissipate heat

D. None of the above

3534. A CE amplifier is also called _______________ circuit?
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A. None of the above

B. Grounded emitter

C. Grounded base

D. Grounded collector

3535. The force per unit charge is know as__________________?
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A. electric flux

B. all of above are same

C. electric potential

D. electric intensity
3536. Long distance transmission is easy for________________?
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A. A.C voltage

B. Half D.C voltage

C. Half A.C voltage

D. D.C voltage

3537. The number of electrons in one coulomb charge is equal to_______________?
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A. 1.6 x 1019

B. 6.2 x 1021

C. 6.2 x 1018

D. 1.6 x 10-27

3538. An alternating current or voltage________________?
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A. changes its direction again and again

B. fluctuates off and on

C. varies in magnitude alone

D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.
3539. The emf induced in a coil by a changing magnetic flux may have unit as______________?
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A. kgms2A-1

B. kgm2s-1A-1

C. ms-1A

D. ms-2A-1

3540. The maximum efficiency of resistance loaded class A power amplifier is _________________?
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A. 50%

B. 5%

C. 30%

D. 25%