electrical engineering MCQs – Page 125

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 Review each marked answer and report any item that may be outdated or unclear.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
2481. Man made noise are______________ variations?
comments icon0
A. Amplitude

B. Frequency

C. Phase

D. Both phase and frequency

2482. At parallel resonance, the ratio L/C is ______________?
comments icon0

A. Small

B. None of the above

C. Zero

D. Very large
2483. Demodulation is done in ________________?
comments icon0

A. Transmitting antenna

B. Receiving antenna

C. Transmitter

D. Radio receiver
2484. Overhead telephone wires are made of_____________?
comments icon0

A. ACSR conductors

B. aluminium

C. steel

D. copper

2485. The tiny block formed by the arrangement of a small group of atoms is called the____________?
comments icon0

A. either A. or (b)

B. space lattice

C. none of the above

D. unit cell
2486. If the resistance of a conductor does not vary in accordance with Ohms law it is known as____________?
comments icon0

A. reverse conductor

B. non-conductor

C. non-linear conductor

D. bad-conductor

2487. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?
comments icon0
A. XL decreases and XC increases

B. Line current becomes minimum

C. XL increases and XC decreases

D. None of the above

2488. At series or parallel resonance, the circuit power factor is ________________?
comments icon0

A. 5

B. 1

C. 0

D. 8

2489. An SCR is turned off when ________________?
comments icon0

A. Gate is reverse biased

B. Gate voltage is reduced to zero

C. Anode current is reduced to zero

D. None of the above

2490. Carbon rods are used in wet and dry cells because_____________?
comments icon0

A. carbon rod serves as conductor

B. carbon can resist the attack of battery acid

C. both (A) and (B)

D. either (A) or (B)

2491. In normal operation of an SCR, gate is _____________w.r.t. cathode?
comments icon0

A. None of the above

B. Positive

C. Negative

D. At zero potential

2492. If modulation is 100% then signal amplitude is ____________arrier amplitude?
comments icon0

A. Greater than

B. Less than

C. None of the above

D. Equal to
2493. For a hole which of the following statements is incorrect ?
comments icon0

A. Holes may constitute an electric current

B. Holes can exist in certain semiconductors only

C. Holes can be considered as a net positive charge

D. Holes can exist in any material including conductors
2494. Modulation is done in____________________
comments icon0

A. None of the above

B. Radio receiver

C. Transmitter

D. Between transmitter and radio receiver

2495. In TV transmission, picture signal is ______________ modulated?
comments icon0

A. Frequency

B. None of the above

C. Phase

D. Amplitude
2496. In the above question, what are the values of cut-off frequencies?
comments icon0

A. None of the above

B. 1030 kHz , 970 kHz

C. 140 kHz , 60 kHz

D. 1020 kHz , 980 kHz
2497. Tuned class C amplifiers are used for RF signals of________________?
comments icon0

A. Low power

B. Very high power

C. None of the above

D. High power

2498. The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is __________________?
comments icon0

A. 30 kHz

B. 10kHz

C. 20 kHz

D. 40 kHz

2499. Superconductivity is observed for____________?
comments icon0

A. a.c. and high frequency

B. none of the above

C. frequencies having no effect

D. d.c. and low frequency

E. infrared frequencies

2500. In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?
comments icon0

A. Frequency

B. Amplitude

C. Phase

D. None of the above