electrical engineering MCQs – Page 290

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 Review each marked answer and report any item that may be outdated or unclear.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
5781. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
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A. 800 Q

B. 600 Q

C. 400 Q

D. 1000 Q

5782. For which of the following ampere second could be the unit ?
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A. Charge

B. Energy

C. Reluctance

D. Power

5783. An instrument which detects electric current is known as_____________?
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A. wattmeter

B. rheostat

C. voltmeter

D. galvanometer
5784. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
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A. The current through each bulb in same

B. None of the above

C. The power dissipation in each bulb is not same

D. The voltage across each bulb is not same

5785. The unit of resistivity is
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A. ? metre.

B. ? / m.

C. ? / metre.

D. ?.

5786. The substances which have a large number of free electrons and offer a low resistance are called____?
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A. conductors

B. insulators

C. semi-conductors

D. inductors

5787. Internal resistance of ideal current source is ?
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A. infinite

B. zero

C. 100 ohms

D. finite

5788. The resistance of a conductor varies inversely as___________?
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A. length

B. area of cross-section

C. temperature

D. resistivity

5789. If 1 A current flows in a circuit, the number of electrons flowing through this circuit is
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A. 0.625 10-<sup>19</sup>

B. 0.625 1019

C. 1.6 10<sup>19</sup>

D. 1.6 10-<sup>19</sup>

5790. Ohms law is not applicable to____________?
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A. circuits with low current densities

B. high voltage circuits

C. vacuum tubes

D. carbon resistors

5791. The voltage induced in an inductor is represented as,
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A. product of its inductance and current through it.

B. product of its inductance and rate of change of current through it.

C. ratio of its inductance to the current through it.

D. ratio of the current through it to its inductance.

5792. Out of the following which is not a poor conductor__________?
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A. Cast iron

B. Tungsten

C. Carbon

D. Copper
5793. Two resistors are said to be connected in series when___________?
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A. same current passes in turn through both

B. both carry the same value of current

C. total current equals the sum of branch currents

D. sum of IR drops equals the applied e.m.f.

5794. Which of the following has no units?
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A. Moment of a magnet

B. Magnetic susceptibility

C. ermittivity

D. Permeability

5795. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
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A. 80 V

B. 132 V

C. 66 v

D. 33 V

5796. Magnetic flux has the unit of
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A. Weber

B. Newton

C. Tesla

D. Ampere-turn

5797. Which of the followings is/are active element?
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A. Current source

B. None of these.

C. Voltage source

D. Both
5798. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
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A. two in parallel

B. three in series

C. two in parallel and one in series

D. three in parallel

5799. The minimum charge on an ion is______________?
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A. equal to the charge of an electron

B. equal to the atomic number of the atom

C. equal to the charge of the number of electrons in an atom (#) zero

5800. Which of the following materials has a negative temperature co-efficient of resistance?
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A. Brass

B. Carbon

C. Aluminum

D. Copper