electrical engineering MCQs – Page 180

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 Review each marked answer and report any item that may be outdated or unclear.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
3581. A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
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A. 10.9 V

B. 1.09 V

C. 12 V

D. 1.1 V

3582. When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?
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A. c. load line

B. c. load line

C. both d.c. and a.c. load lines

D. none of the above

3583. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?
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A. 20 W

B. 80 W

C. 40 W

D. 10 W

3584. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ______________ operation?
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A. Class B

B. Class A

C. None of the above

D. Class C
3585. 1 db corresponds to_____________change in voltage or current level?
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A. 80%

B. 40%

C. 25%

D. 20%

3586. Photocopier and inject printer are dealt in________________?
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A. Charges in motion

B. Capacitors

C. Electrostatics

D. Electric fields

3587. If metallic conductor is charged negatively then its weight______________?
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A. First increases then decreases

B. Increases for a while

C. Remains same

D. Decreases then increases

3588. The most important consideration in power amplifier is __________________?
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A. Collector efficiency

B. None of the above

C. Biasing the circuit

D. To keep the transformer cool

3589. Power loss in actual transformer is due to_________________?
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A. Soft iron core

B. Back emf

C. Small output

D. Eddy currents and magnetic hysterias
3590. The best frequency response is of_____________coupling?
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A. RC

B. None of the above

C. Transformer

D. Direct
3591. The current flowing through an unloaded voltage divider is called the____________?
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A. resistor current

B. bleeder current

C. voltage current

D. load current

3592. A voltage divider consists of two 100 k? resistors and a 12 V source. What will the output voltage be if a load resistor of 1 M? is connected to the output?
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A. 6 V

B. 0.57 V

C. 5.7 V

D. 12 V

3593. When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?
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A. half the source voltage

B. the same as the source voltage

C. zero volts

D. twice the source voltage

3594. A series resonant band-stop filter consists of a 68 ? resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, RW, of the coil is 4 ?. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?
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A. 111 mV

B. 200 mV

C. 11.1 mV

D. 1.1 mV

3595. 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_____________?
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A. 0.03125 volt

B. 3.125 volt

C. 31.25 volt

D. 0 volt

3596. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
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A. 20 W

B. 10 W

C. 15 W

D. 5 W

3597. If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
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A. cannot tell

B. decreases

C. increases

D. remains the same

3598. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
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A. RL

B. RC + RL

C. RC

D. RC || RL

3599. The input capacitor in an amplifier is the______________ capacitor?
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A. None of the above

B. Bypass

C. Coupling

D. Leakage

3600. The ratio of output impedance of a CE amplifier is _______________?
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A. About 1

B. Low

C. High

D. Moderate