electrical engineering MCQs – Page 135

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 Review each marked answer and report any item that may be outdated or unclear.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
2681. If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
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A. none of the above

B. drastically increased

C. unaffected

D. drastically reduced
2682. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage?
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A. None of the above

B. Equal to

C. Greater than

D. Less than
2683. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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A. Kanthal

B. Molybdenum

C. Constantan

D. Nichrome
2684. A high Q tuned circuit will permit an amplifier to have high __________________?
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A. Sensitivity

B. Fidelity

C. Selectivity

D. Frequency range

2685. Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
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A. Skin effect

B. Internal Capacitance of the device

C. Coupling capacitor at the input

D. Coupling capacitor at the output

2686. Carbon resistors are used extensively because they are____________?
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A. all of the above reasons

B. inexpensive

C. compact

D. easy to make

2687. __________ is the main constituent of glass?
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A. Fe203

B. AI2O3

C. B2O3

D. Si02
2688. We can control a.c. power in a load by connecting ______________?
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A. Two SCRs in series

B. Two SCRs in parallel opposition

C. Two SCRs in parallel

D. None of the above

2689. Which of the following amplifier circuit using junction transistor has the best gain?
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A. Common emitter

B. All have the same gain

C. Common base

D. Common collector

2690. Constantan contains_______________?
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A. tungsten and silver

B. copper and tungsten

C. silver and tin

D. copper and nickel
2691. . If =0.98 ,Ico=6A and I?=100A for a transistor,then the value of Ic will be______?
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A. 3.2mA

B. 4.6 mA

C. 2.3mA

D. 5.2mA
2692. The Q of an LC circuit is given by _________________?
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A. R2/2pfrL

B. 2pfr x R

C. R / 2pfrL

D. 2pfrL / R
2693. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
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A. Vdc = Vm/?, PIV=2Vm

B. Vdc = Vm/?, PIV=Vm

C. Vdc = 2Vm/?, PIV=2vm

D. Vdc = 2Vm/?, PIV=Vm

2694. The action of electromagnetic machines can be related to which of the following basic principles __________?
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A. Interaction

B. Alignment

C. All of the above

D. Induction

2695. Frequencies above ______________ kHz are called radio frequencies?
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A. 10

B. 2

C. 50

D. 200
2696. In graphite, bonding is____________?
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A. covalent

B. Vander Waals

C. Vander Waals and covalent

D. metallic

2697. 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. 1520 kHz

C. 455 kHz

D. 1500 kHz

2698. In an unregulated power supply, if load current increases, the output voltage _____________?
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A. Increases

B. Remains the same

C. Decreases

D. None of the above

2699. A Zener diode is used as a _____________voltage regulating device?
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A. Shunt

B. None of the above

C. Series

D. Series-shunt

2700. In a Zener voltage regulator, the changes in load current produce changes in _________________?
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A. None of the above

B. Zener current

C. Zener voltage

D. Zener voltage as well as Zener current