testing-and-maintenance-mcqs - Set (1)

Correct Answer: Orange && Worng Answer: Red

1. Wires carrying electric current are covered with good insulator for safety purpose. It is called _

  • (A). Fuse
  • (B). Circuit breaker
  • (C). Rope
  • (D). Cable
    • View Answer

    Explanation: Not Avilable

    2. A safety device which connected in series with live wire in circuit to protect equipments is called

  • (A). Switch
  • (B). Indicator
  • (C). Fuse
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    3. Electric shock by high voltage and high current stops breating ______

  • (A). For longer period
  • (B). Momentarily
  • (C). Both (a) and (b)
  • (D). None of these
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    Explanation: Not Avilable

    4. Electric fire is extinguished by ______

  • (A). Liquid extinguisher
  • (B). Wet chemical extinguisher
  • (C). CO2 extinguisher
  • (D). None of these
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    Explanation: Not Avilable

    5. Preventive maintenance is done due to the following :

  • (A). It increases the life of machine
  • (B). It reduces the breakdown to minimum
  • (C). It increases the efficiency of machine
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    6. Factors considered during preparing maintenance schedule is/are

  • (A). Checking of stationary parts
  • (B). Checking of movable parts
  • (C). Checking of surrounding in which the equipment has to work
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    7. Causes of breakdown of machines are

  • (A). Negligence
  • (B). Incorrect installation
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    8. Monthly maintenance of motor includes :

  • (A). Checking of winding for their proper insulation
  • (B). Checking of air gap between stator and rotor
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    9. The function of conservator in a transformer is :

  • (A). To prevent flow of air into the tank
  • (B). To prevent flow of moisture into the tank
  • (C). To take care of expansion and contraction of oil
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    10. In power transformer, the breather is provided to

  • (A). Take fresh air for increasing cooling effect
  • (B). Arrest flow of moisture into the tank
  • (C). Control the level of oil in the tank
  • (D). Filter transformer oil
    • View Answer

    Explanation: Not Avilable

    11. Buchholz relay is used in :

  • (A). Welding transformer
  • (B). Oil cooled transformer
  • (C). Air cooled transformer
  • (D). None of these
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    Explanation: Not Avilable

    12. Oil in the transformer is used for providing

  • (A). Cooling to the winding
  • (B). Insulation to the winding
  • (C). Protection against atmospheric humidity
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    13. In order to determine suitability of the oil in transformer tests carried out are :

  • (A). Acidity test
  • (B). Breakdown test
  • (C). Crackle test
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    14. Isolators used in transmission line are capable of breaking ______

  • (A). Fault current
  • (B). Load current
  • (C). Charging current
  • (D). None of these
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    Explanation: Not Avilable

    15. The basic function of a circuit breaker is ______

  • (A). To produce arc
  • (B). To ionise the surrounding arc
  • (C). To extinguish the arc
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    16. Earth tester is used to measure :

  • (A). Insulation resistance
  • (B). Earth resistance
  • (C). Volatage
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    17. The main objective of foundation for electrical machine is :

  • (A). To support the weight of machine
  • (B). To maintain the alignment of the machine
  • (C). To provide firm for the machine
  • (D). All of the above
    • View Answer

    Explanation: Not Avilable

    18. Cause of vibration in electrical machine is :

  • (A). Electrical causes
  • (B). Mechanical causes
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    19. Magnetisation current in three phase induction motor depends on :

  • (A). Load
  • (B). Rating
  • (C). Type of motor
  • (D). Air gap
    • View Answer

    Explanation: A large air-gap length leads to higher magnetizing current and poor power factor.

    20. For proper parallel operation, alternators must have the same ______

  • (A). Speed
  • (B). Voltage rating
  • (C). KVA rating
  • (D). Excitation
    • View Answer

    Explanation: Not Avilable

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