electrical engineering MCQs – Page 183

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 Review each marked answer and report any item that may be outdated or unclear.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
3641. If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
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A. RC

B. RL + RC

C. RL RC

D. RC || RL
3642. What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
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A. 7

B. None of the above

C. 2

D. 3

3643. In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?
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A. None of the above

B. Short

C. Open

D. Partially short

3644. An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k? resistor. The output voltage is taken across the resistor. The circuits critical frequency is______________?
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A. 93.8 kHz

B. 861 Hz

C. 86.12 kHz

D. 93.8 Hz

3645. A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is____________?
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A. 18 V peak-to-peak

B. 9 V peak-to-peak

C. 12.74 V peak-to-peak

D. zero
3646. A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
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A. 103 C

B. 4 x 103 C

C. 2.5 x 10-8 C

D. 10-5 C
3647. In practice, voltage gain is expressed______________?
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A. None of the above

B. In volts

C. As a number

D. In db
3648. For highest power gain, one would use _________________configuration?
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A. none of the above

B. CC

C. CE

D. CB

3649. A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
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A. RC || RE

B. RC

C. RC RE

D. RC + RE
3650. A device able to supply electrical energy is a __________?
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A. battery

B. microwave

C. nonconductor

D. conductor

3651. The upper or lower cut off frequency is also called______________frequency?
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A. Sideband

B. 3 db

C. Resonant

D. None of the above

3652. In a CE amplifier, voltage gain =____________________ x RAC/Rin?
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A. ?

B. (1 + ?)

C. (1+ ?)

D. ?

3653. A class A power amplifier uses _________________?
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A. Three transistors

B. None of the above

C. Two transistors

D. One transistor
3654. A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?
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A. negative

B. data is insufficient

C. zero

D. positive

3655. In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
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A. Is constant

B. None of the above

C. Changes abruptly with frequency

D. Changes uniformly with frequency

3656. In a seriesparallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2s voltage will:___________?
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A. decrease

B. cannot tell

C. increase

D. remain the same

3657. When the motor is at its maximum speed then back emf will be______________?
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A. No back emf

B. Intermediate values

C. Maximum

D. Zero

3658. The minimum charge on any object cannot be less than_______________?
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A. 9.1 x 109C

B. 1.6 x 10-19C

C. 3.2 x 10-19C

D. no definite value exist

3659. Magnetic compass needle will be deflecting if it is kept near________________?
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A. Static charge

B. Semi-conductor

C. Soft iron

D. Accelerating charge
3660. The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
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A. The same as

B. More than

C. Less than

D. None of the above