electrical engineering MCQs – Page 131

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 Review each marked answer and report any item that may be outdated or unclear.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
2601. In thermocouples which of the following pairs is commonly used ?
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A. Aluminium-tin

B. Iron-steel

C. Copper-constantan

D. Silver-German silver

2602. Which of the following materials is the best conductor of electricity ?
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A. Copper

B. Tungsten

C. Carbon

D. Aluminium

2603. Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude?
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A. Greater than

B. None of the above

C. Less than

D. Equal to

2604. Mercury as an electric contact material is_______________?
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A. a metal

B. a gas

C. a liquid

D. a metal liquid
2605. The structure sensitive property of a super conductor is______________?
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A. transition temperature

B. critical magnetic field

C. none of the above

D. critical current density
2606. If firing angle in an SCR circuit is increased, the output _____________?
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A. Is decreased

B. Remains the same

C. None of the above

D. Is increased

2607. The change in flux linkages can be caused in which of the following ways ?
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A. The flux is constant with respect to time and is stationary and the coil moves through it

B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time

C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field

D. All of the above
2608. Which of the following variety of copper has the best conductivity ?
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A. Pure annealed copper

B. Induction hardened copper

C. Copper containing traces of silicon

D. Hard drawn copper

2609. Superconductors are becoming popular for use in________________?
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A. generating regions free from magnetic field

B. generating very strong magnetic field

C. generating electrostatic field

D. manufacture of bubble memories

2610. Electrical machines having a power output up to about 750 W may be called__________machines?
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A. medium size

B. any of the above

C. large size

D. small size
2611. The forbidden gap in an insulator is________________?
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A. small

B. any of the above

C. nil

D. large
2612. The conductivity of an extrinsic semiconductor with temperature________________?
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A. decreases

B. increases

C. remains constant
2613. The converse of hardness is known as______________?
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A. malleability

B. toughness

C. none of the above

D. softness
2614. The photo-electric effect occurs only when the incident light has more than a certain critical____________?
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A. intensity

B. wave length

C. speed

D. frequency
2615. The covalent bond is formed by_______________?
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A. transfer of electrons between atoms

B. none of the above

C. sharing of electrons between atoms

D. sharing of variable number of electrons by a variable number of atoms

2616. Substances whose specific resistance abruptly decreases at very low temperature are called___________?
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A. insulators

B. semiconductors

C. superconductors

D. conductors

2617. Surface resistance of an insulating material is reduced due to the______________?
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A. smoky and dirty atmosphere

B. humidity in the atmosphere

C. both (A) and (b)

D. neither (A) nor (b)

2618. In an SCR circuit, the angle of conduction can be changed by__________________?
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A. Reverse biasing the gate

B. Changing anode voltage

C. Changing gate voltage

D. None of the above

2619. The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
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A. V

B. mV

C. V

D. None of the above

2620. An SCR has __________ pn junctions?
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A. Two

B. Three

C. None of the above

D. Four