electrical engineering MCQs – Page 195

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 Review each marked answer and report any item that may be outdated or unclear.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
3881. A negative clipper removes the ______________half-cycles of the input voltage?
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A. Negative

B. Positive

C. Both positive and negative

D. None of the above

3882. The maximum speed of electronic switch can be _____________operations per second?
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A. 10

B. 1000

C. 104

D. 109
3883. The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is____________?
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A. 540 mA

B. 200 mA

C. 900 mA

D. 1.24 A
3884. In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
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A. R3 is open

B. the circuit is operating properly

C. R1 is open

D. R2 is open

3885. A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately___________?
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A. 61 mA

B. 18 mA

C. 110 mA

D. 610 mA

3886. An ammeter has an internal resistance of 50 ?. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately___________?
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A. 50 ?

B. 55 ?

C. 9 ?

D. 5.5 ?
3887. A sudden increase in the total current into a parallel circuit may indicate______________?
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A. either a drop in source voltage or an open resistor

B. an open resistor

C. an increase in source voltage

D. a drop in source voltage

3888. When a 1.6 k? resistor and a 120? resistor are connected in parallel, the total resistance is____________?
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A. less than 100 ?

B. greater than 1.6 k?

C. less than 120 but greater than 100 ?

D. greater than 120 but less than 1.6 k?

3889. Three lights are connected in parallel across a 120 volt source. If one light burns out_____________?
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A. the remaining two will glow brighter

B. the remaining two will glow dimmer

C. the remaining two will not light

D. the remaining two will glow with the same brightness as before
3890. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?
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A. 135 mA

B. 15 mA

C. 60 mA

D. 31.25 mA
3891. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?
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A. 12.5 ?

B. 50 ?

C. 20 K?

D. 200 ?

3892. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________________?
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A. 4.8 W

B. 12 W

C. 0.3 W

D. 1.2 W

3893. Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?
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A. 72 W

B. 1.5 W

C. 18 W

D. 48 W

3894. Five 100 ? resistors are connected in parallel. If one resistor is removed, the total resistance is______________?
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A. 20 ?

B. 100 ?

C. 500 ?

D. 25 ?
3895. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_______________?
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A. 3 mA

B. 12 mA

C. 12:00 AM

D. 48 mA

3896. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance_____________?
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A. is less than 600 ?

B. is greater than 1.2 k?

C. is less than 6 k?

D. is less than 1.2 k?

3897. Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 ?, the current through each parallel resistor is____________?
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A. 6.25 mA

B. 25 mA

C. 100 mA

D. 200 mA

3898. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?
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A. 310 mA

B. 800 mA

C. 490 mA

D. 12:00 AM

3899. A 470 ? resistor, a 220 ? resistor, and a 100 ? resistor are all in parallel. The total resistance is approximately________________?
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A. 790 ?

B. 470 ?

C. 30 ?

D. 60 ?
3900. The total resistance of a parallel circuit is 50 ?. If the total current is 120 mA, the current through the 270 ? that makes up part of the parallel circuit is approximately_______________?
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A. 120 mA

B. 220 mA

C. 50 mA

D. 22 mA