Em Quiz On 05/05/2020

33 Questions | Total Attempts: 42

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Em Quiz On 05/05/2020


Questions and Answers
  • 1. 
    Is an instrument which measures the insulation resistance of an electric circuit relative to the earth and one another,
    • A. 

      Tangent galvanometer

    • B. 

      Meggar

    • C. 

      Current transformer

    • D. 

      None of the above

  • 2. 
    The household energy meter is----
    • A. 

      An indicating instrument

    • B. 

      A recording instrument

    • C. 

      An integrating instrument

    • D. 

      None of the above

  • 3. 
    The pointer of an indicating instrument should be----
    • A. 

      Very light

    • B. 

      Very heavy

    • C. 

      Either (a) or (b)

    • D. 

      Neither (a) nor (b)

  • 4. 
    In the majority of instruments, damping is provided by
    • A. 

      Fluid friction

    • B. 

      Spring

    • C. 

      Eddy currents

    • D. 

      All of the above

  • 5. 
    An ammeter is a-----------
    • A. 

      Secondary instrument

    • B. 

      Absolute instrument

    • C. 

      Recording instrument

    • D. 

      Integrating instrument

  • 6. 
    In a portable instrument, the controlling torque is provided by-----
    • A. 

      Spring

    • B. 

      Gravity

    • C. 

      Eddy currents

    • D. 

      All of the above

  • 7. 
    The disc of an instrument using eddy current damping should be of-----
    • A. 

      Conducting and magnetic material

    • B. 

      Non-conducting and magnetic material

    • C. 

      Conducting and non-magnetic material

    • D. 

      None of the above

  • 8. 
    The switchboard instruments
    • A. 

      Should be mounted in vertical position

    • B. 

      Should be mounted in horizontal position

    • C. 

      Either (a) or (b)

    • D. 

      Neither (a) nor (b)

  • 9. 
    The function of shunt in an ammeter is to----
    • A. 

      By pass the current

    • B. 

      Increase the sensitivity of the ammeter

    • C. 

      Increase the resistance of ammeter

    • D. 

      None of the above

  • 10. 
    The multiplier and the meter coil in a voltmeter are in-----
    • A. 

      Series

    • B. 

      Parallel

    • C. 

      Series-parallel

    • D. 

      None of the above

  • 11. 
    A moving iron instrument can be used for----
    • A. 

      D.C. only

    • B. 

      A.C. only

    • C. 

      Both D.C. and A.C.

    • D. 

      None of the above

  • 12. 
    The resistance in the circuit of the moving coil of a dynamometer wattmeter should be----
    • A. 

      Almost zero

    • B. 

      Low

    • C. 

      High

    • D. 

      None of the above

  • 13. 
    A dynamometer wattmeter can be used for----
    • A. 

      Both D.C. and A.C.

    • B. 

      D.C. only

    • C. 

      A.C. only

    • D. 

      Any of the above

  • 14. 
    An induction wattmeter can be used for----
    • A. 

      Both D.C. and A.C.

    • B. 

      D.C. only

    • C. 

      A.C. only

    • D. 

      Any of the above

  • 15. 
    The pressure coil of a wattmeter should be connected on the supply side of the current coil when
    • A. 

      Load impedance is high

    • B. 

      Load impedance is low

    • C. 

      Supply voltage is low

    • D. 

      None of the above

  • 16. 
    In a low power factor wattmeter, the pressure coil is connected
    • A. 

      To the supply side of the current coil

    • B. 

      To the load side of the current coil

    • C. 

      In any of the two meters at connection

    • D. 

      None of the above

  • 17. 
    In a low power factor wattmeter, the compensating coil is connected
    • A. 

      In series with current coil

    • B. 

      In parallel with current coil

    • C. 

      In series with pressure coil

    • D. 

      In parallel with pressure coil

  • 18. 
    In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
    • A. 

      Unity

    • B. 

      0.8 lagging

    • C. 

      0.8 leading

    • D. 

      Zero

  • 19. 
    In a 3-phase power measurement by two wattmeter method, the reading of one of the wattmeter was zero. The power factor of the load must be
    • A. 

      Unity

    • B. 

      0.5

    • C. 

      0.3

    • D. 

      Zero

  • 20. 
    The adjustment of the position of shading bands, in an energy meter, is done to provide
    • A. 

      Friction compensation

    • B. 

      Creep compensation

    • C. 

      Braking torque

    • D. 

      None of the above

  • 21. 
    For measuring a very high resistance we should use----
    • A. 

      Kelvin's double bridge

    • B. 

      Wheat stone bridge

    • C. 

      Meggar

    • D. 

      None of the above

  • 22. 
    The electrical power to a meggar is provided by
    • A. 

      Battery

    • B. 

      Permanent magnet D.C. generator

    • C. 

      AC. generator

    • D. 

      Any of the above

  • 23. 
    In a meggar controlling torque is provided by-----
    • A. 

      Spring

    • B. 

      Gravity

    • C. 

      Coil

    • D. 

      Eddy current

  • 24. 
    Which of the following devices should be used for accurate measurement of low D.C. voltage?
    • A. 

      Small range moving coil voltmeter

    • B. 

      D.C. potentiometer

    • C. 

      Small range thermocouple voltmeter

    • D. 

      None of the above

  • 25. 
    A voltage of about 200 V can be measured
    • A. 

      Directly by a D.C. potentiometer

    • B. 

      A D.C. potentiometer in conjunction with a volt ratio box

    • C. 

      A D.C. potentiometer in conjunction with a known resistance

    • D. 

      None of the above

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