electrical engineering MCQs – Page 175

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 Review each marked answer and report any item that may be outdated or unclear.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
3481. cmf generated by A.C dynamo depends upon_____________?
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A. number of turns in the coil

B. magnetic field strength

C. frequency of rotation

D. all of above
3482. The electric lines of force are____________?
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A. physically existing every where

B. physically existing near the charges

C. imaginary

D. depends upon case

3483. SI unit of the permittivity of free space is________________?
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A. N-1m-2C2

B. Nm2C2

C. NmC-1

D. N-1mC-2

3484. Two 3.3 k? resistors are in series and this series combination is in parallel with a 4.7 k? resistor. The voltage across one of the 3.3 k? resistors is 12 V. The voltage across the 4.7 k? resistor is_________?
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A. 12 V

B. 6 V

C. 0 V

D. 24 V
3485. When a transistor is cut off _________________?
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A. Maximum current flows

B. None of the above

C. Maximum voltage appears across transistor

D. Maximum voltage appears across load

3486. A parallel resonant band-pass filter consists of a 6.8 ? resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 ?. What is the center frequency of the filter?
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A. 5.03 MHz

B. 5.14 MHz

C. 503 kHz

D. 514 kHz

3487. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
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A. 0 Hz to 3.5 kHz

B. 0 Hz

C. 3.5 kHz

D. 7 kHz

3488. N/C =_____________?
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A. A/m

B. V/m

C. J/V

D. V/A

3489. The output stage of a multistage amplifier usually employs______________?
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A. None of the above

B. Push-pull amplifier

C. Class A power amplifier

D. Preamplifier

3490. Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________?
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A. 9 x 109N

B. 9 x 107N

C. 9.2 x 104N

D. 9 x 109N
3491. Which of the following works on torque on the current carrying conductor placed in magnetic field ?
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A. galvanometer

B. all of the above

C. ammeter

D. voltmeter

3492. Self inductance of a coil depends upon________________?
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A. number of turns per unit length

B. current flowing

C. all

D. voltage produce

3493. Non inductive resistances are used in decreasing______________?
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A. Magnetic fields

B. Self inductance

C. Mutual inductance

D. Heating effect

3494. In a non-uniform electric field a polar molecule will experience____________?
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A. Net torque

B. Net force

C. both series and parallel combinations

D. zero

3495. The maximum efficiency of transformer coupled class A power amplifier is _______________?
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A. 50%

B. 45%

C. 80%

D. 30%

3496. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?
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A. 21.21 V

B. 0 V

C. 10.60 V

D. 15 V

3497. Value of ?r for various dielectrics is always________________?
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A. Less than unity

B. No hard and fast rule

C. Equal to the unit

D. Larger than unit
3498. A 25eV electron has a speed of______________?
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A. 2 x 106m/sec

B. 4 x 106m/sec

C. 5 x 106m/sec

D. 3 x 106m/sec
3499. An advantage of RC coupling scheme is the___________?
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A. High efficiency

B. Good impedance matching

C. Economy

D. None of the above

3500. emf induced in a circuit according to Faradays law depends on the_____________?
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A. change in magnetic flux

B. initial magnetic flux

C. maximum magnetic flux

D. rate of change of magnetic flux