electrical engineering MCQs – Page 324

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

6461. The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is __________________?
0

A. 10kHz

B. 30 kHz

C. 20 kHz

D. 40 kHz

6462. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
0

A. XL increases and XC decreases

B. XL decreases and XC increases

C. Both XL and XC increase

D. Both XL and XC decrease

6463. At series resonance, voltage across L is____________voltage across C?
0

A. Less than but in phase with

B. Equal to but opposite in phase to

C. Greater than but in phase with

D. Equal to but in phase with

6464. A class C amplifier always drives _____________load?
0

A. A resonant tank

B. A pure capacitive

C. A pure inductive

D. A pure resistive

6465. Double tuned circuits are used in ____________ stages of a radio receiver?
0

A. None of the above

B. Output

C. IF

D. Audio

6466. If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?
0

A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

6467. At parallel resonance, the net reactive component circuit current is _______________?
0

A. Capacitive

B. Zero

C. Inductive

D. None of the above

6468. In the above question, what are the values of cut-off frequencies?
0

A. 1020 kHz , 980 kHz

B. 1030 kHz , 970 kHz

C. None of the above

D. 140 kHz , 60 kHz

6469. A resonant circuit contains ____________elements?
0

A. R and L only

B. L and C

C. R and C only

D. Only R

6470. A tuned amplifier is used in ___________ applications?
0

A. None of the above

B. Low frequency

C. Radio frequency

D. Audio frequency

6471. The Q of a tuned amplifier is generally _________________?
0

A. Less than 10

B. Less than 5

C. None of the above

D. More than 10

6472. At series resonance, the circuit offers____________ impedance?
0

A. None of the above

B. Maximum

C. Zero

D. Minimum

6473. In parallel resonance, the circuit impedance is_________________?
0

A. CR/L

B. C/LR

C. R/LC

D. L/CR

6474. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?
0

A. None of the above

B. Line current becomes minimum

C. XL increases and XC decreases

D. XL decreases and XC increases

6475. A tuned amplifier uses__________load?
0

A. Resistive

B. LC tank

C. Inductive

D. Capacitive

6476. The voltage gain of a tuned amplifier is____________at resonant frequency
0

A. Maximum

B. Half-way between maximum and minimum

C. Minimum

D. Zero

6477. Tuned class C amplifiers are used for RF signals of________________?
0

A. None of the above

B. Low power

C. Very high power

D. High power

6478. At series or parallel resonance, the circuit power factor is ________________?
0

A. 0

B. 1

C. 8

D. 5

6479. The dimensions of L/CR are that of _______________?
0

A. Farad

B. Henry

C. None of the above

D. Ohm

6480. At series resonance, the net reactive component of circuit current is _______________?
0

A. Capacitive

B. None of the above

C. Zero

D. Inductive

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