electrical engineering MCQs – Page 105

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

2081. Thermal overload relays are used to protect the motor against over current due to____________?
0

A. short-circuits

B. heavy loads

C. grounds

D. all of the above

2082. The voltage drop at anode, in a mercury arc rectifier is due to_____________?
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A. self restoring property of mercury

B. energy spent in overcoming the electrostatic field

C. high ionization potential

D. high temperature inside the rectifier

2083. Which of the following is expected to have the maximum permeability ?
0

A. Brass

B. Ebonite

C. Zinc

D. Copper

2084. Over voltage protection is recommended for______________?
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A. hydro-electric generators

B. none of the above

C. steam turbine generators

D. all of the above

E. gas turbine generators

2085. Circuit breakers are essentially______________?
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A. circuits to break the system

B. any of the above

C. current carrying contacts called electrodes

D. transformers to isolate the two systems

E. arc extinguishers

2086. Overfluxing protection is recommended for_____________?
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A. auto-transformer of the power plant

B. station transformer of the power plant

C. generator transformer of the power plant

D. distribution transformer

2087. The force between two long parallel conductors is inversely proportional to_____________?
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A. current in one conductor

B. distance between the conductors

C. product of current in two conductors

D. radius of conductors

2088. Unit for quantity of electricity is_____________?
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A. ampere-hour

B. watt

C. joule

D. coulomb

2089. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5k? and C1 = 0.05?F___________?
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A. 127.3 kHz

B. 1.273kHz

C. 127.3 Hz

D. 12.73kHz

2090. A transmission line is protected by_____________?
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A. inrush protection

B. distance protection

C. time graded and current graded over current protection

D. both (B) and (C)

E. none of the above

2091. An ideal OP-AMP is an ideal______________?
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A. Voltage controlled voltage source

B. voltage controlled current source

C. Current controlled voltage source

D. Current controlled Current source

2092. In a single phase rotary converter the number of slip rings will be_____________?
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A. three

B. four

C. two

D. none

E. six

2093. Induction cup relay is operated due to changes in________________?
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A. voltage

B. all of the above

C. impedance

D. current

2094. For the protection of power station buildings against direct strokes the requirements are___________?
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A. interception, conduction and dissipation

B. interception

C. interception and conduction

D. interception, conduction, dissipation and reflection

E. none of the above

2095. Which of the following is a vector quantity ?
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A. Magnetic field intensity

B. Relative permeability

C. Magnetic potential

D. Flux density

2096. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
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A. Decreases

B. First increases and then decreases depending on the depth of iron insertion

C. Remains same

D. Increases

2097. The magneto-motive force is______________?
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A. the passage of magnetic field through an exciting coil

B. the voltage across the two ends of exciting coil

C. the flow of an electric current

D. the sum of all currents embraced by one line of magnetic field

2098. Arc in a circuit behaves as_______________?
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A. a resistance increasing with voltage rise across the arc

B. an inductive reactance

C. a capackive reactance

D. a resistance decreasing with voltage rise across the arc

2099. The fuse blows off by___________?
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A. none of the above

B. burning

C. melting

D. arcing

2100. Main causes of noisy solenoid are______________?
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A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

C. both of above

D. none of the above

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