electrical engineering MCQs – Page 257

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 Review each marked answer and report any item that may be outdated or unclear.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
5121. If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?
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A. Selectivity

B. Sensitivity

C. Fidelity

D. Distortion

5122. If Amin = 40 and Amax = 60, what is the percentage of modulation?
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A. 20 %

B. 50%

C. 40%

D. 10%

5123. In the above question, what is the power in sidebands?
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A. 9 kW

B. 8 kW

C. 6 kW

D. 06 kW
5124. In superhetrodyne receiver, the input at mixer stage is________________?
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A. IF and RF

B. RF and AF

C. IF and AF

D. RF and local oscillator signal
5125. In TV transmission, picture signal is ______________ modulated?
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A. Amplitude

B. Frequency

C. None of the above

D. Phase

5126. Superhertodyne principle refers to_________________?
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A. None of the above

B. Using a large number of amplifier stages

C. Obtaining lower fixed intermediate frequency

D. Using a push-pull circuit

5127. A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
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A. 3

B. None of the above

C. 6

D. 5

5128. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?
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A. 5 kW

B. 8 kW

C. 25 kW

D. 50 kW
5129. Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
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A. Detector

B. IF

C. Audio amplifier

D. RF amplifier

5130. In a radio receiver, noise is generally developed at _______________?
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A. Audio stage

B. IF stage

C. RF stage

D. Receiving antenna

5131. The letters AVC stand for ________________?
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A. Audio voltage control

B. Abrupt voltage control

C. Automatic volume control

D. Automatic voltage control

5132. In a TRF radio receiver, the RF and detection stages are tuned to______________?
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A. None of the above

B. IF

C. Audio frequency

D. Radio frequency
5133. The function of ferrite antenna is to_________________?
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A. Reduce noise

B. Increase the Q of tuned circuit

C. Stabilise d.c. bias

D. Reduce stray capacitance

5134. In an AM wave, the majority of the power is in _____________?
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A. Lower sideband

B. Upper sideband

C. None of the above

D. Carrier
5135. When the modulating signal controls the frequency of the carrier, we get______________?
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A. Frequency modulation

B. Phase modulation

C. Amplitude modulation

D. May be any one of the above

5136. In a transmitter ____________oscillator is used?
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A. Wien-bridge

B. Hartley

C. RC phase-shift

D. Crystal
5137. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
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A. None of the above

B. Only the difference frequency can be modulated

C. The difference frequency is closer to oscillator frequency

D. Lower frequencies are easier to amplify
5138. A high Q tuned circuit will permit an amplifier to have high __________________?
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A. Fidelity

B. Sensitivity

C. Frequency range

D. Selectivity
5139. Demodulation is done in ________________?
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A. Transmitting antenna

B. Transmitter

C. Radio receiver

D. Receiving antenna

5140. The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?
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A. 1310 kHz

B. 455 kHz

C. 1520 kHz

D. 1500 kHz