electrical engineering MCQs – Page 196

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 Review each marked answer and report any item that may be outdated or unclear.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
3901. Three 47 ? resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately_______________?
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A. 7.06 A

B. 47 mA

C. 2.3 A

D. 780 mA

3902. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is_________________?
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A. 50 mA

B. 120 mA

C. 40 mA

D. 70 mA
3903. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____________?
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A. 1:00 AM

B. 7 A

C. the larger of the two

D. unknown

3904. The following resistors are in parallel across a voltage source: 220? , 470? , and 560? . The resistor with the least current is______________?
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A. impossible to determine without knowing the voltage

B. 560 ?

C. 220 ?

D. 470 ?

3905. 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 1.2 k?

D. is less than 6 k?

3906. When an additional resistor is connected across an existing parallel circuit, the total resistance____________?
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A. increases by the value of the added resistor

B. decreases by the value of the added resistor

C. decreases

D. remains the same

3907. If one of the resistors in a parallel circuit is removed, the total resistance_____________?
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A. remains the same

B. decreases

C. increases

D. doubles

3908. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?
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A. 2.2 A

B. 9.09 A

C. 137 mA

D. 1.8 A
3909. With which of the following, a circuit breaker must be equipped for remote operation ?
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A. None of the above

B. Shunt trip

C. Time-delay trip

D. All of the above

E. Inverse time trip

3910. The single phasing relays are used for the protection of_____________?
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A. two single phase motors running in parallel

B. three phase motors

C. single phase motors only

D. two phase motors only

3911. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
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A. Infinity

B. None of the above

C. Zero

D. Unity

3912. Which of the following parameter can be neglected for a short line ?
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A. Resistance

B. Capacitance

C. Inductance

D. Reactance

3913. A _________ is used to measure the stator % winding temperature of the generator?
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A. thermometer

B. thermocouple

C. resistance thermometer

D. pyrometer

3914. On which of the following effects of electric current a fuse operates ?
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A. Heating effect

B. Electrostatic effect

C. Photoelectric effect

D. Magnetic effect

3915. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
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A. be of sufficient size and proper shape

B. be clean and smooth

C. have all above properties

D. have low contact resistance

3916. When a transmission line is energized, the wave that propagates on it is____________?
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A. current wave only

B. voltage wave only

C. Both (A) and (B)

D. power factor wave only

3917. The main function of a fuse is to_____________?
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A. none of the above

B. protect the line

C. prevent excessive currents

D. protect the appliance

E. open the circuit

3918. An efficient and a well designed protective relaying should have_____________?
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A. high speed and selectivity

B. good selectivity and reliability

C. all of the above

D. economy and simplicity

3919. Series capacitors are used to_________________?
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A. improve line voltage

B. none of the above

C. compensate for line inductive reactance

D. compensate for line capacitive reactance

3920. The arcing contacts in a circuit breaker are made of______________?
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A. aluminium alloy

B. copper tungsten alloy

C. porcelain

D. electrolytic copper