Electronic measurements and instrumentation miscellaneous

Electronic measurements and instrumentation miscellaneous

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Electronic Measurements And Instrumentation

Electronic measurements and instrumentation miscellaneous
  1. Two voltmeters one with a full scale reading of 100 V and another with a full scale reading of 200 V, are connected in series across a 100 V supply. The internal resistance of both meters is the same. What are the readings?








  1. View Hint View Answer Discuss in Forum

    The given problem can be better understand by the figure given below:
    Since both the voltmeter have same internal resistance and the voltmeter are connected in series across a 100V supply. Hence the reading of both the voltmeters will be same i.e. 50V.


    Correct Option: D

    The given problem can be better understand by the figure given below:
    Since both the voltmeter have same internal resistance and the voltmeter are connected in series across a 100V supply. Hence the reading of both the voltmeters will be same i.e. 50V.


  1. The deflection of hot wire instruments depends on:








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    The deflection of not wire instruments depends on r.m.s. value of alternating current.

    Correct Option: C

    The deflection of not wire instruments depends on r.m.s. value of alternating current.

  1. An LVDT is used to measure displacement. The output of the LVDT is connected to a voltmeter of range 0 to 5V through an amplifier having a gain of 250. For a displacement of 0·5 mm, the output of the LVDT is 2 mV. The sensitivity of the instrument would be:








  1. View Hint View Answer Discuss in Forum

    Sensitivity of LVDT =
    output voltage
    displacement

    =
    2mV
    0·5mm

    = 1V/mm.

    Correct Option: C

    Sensitivity of LVDT =
    output voltage
    displacement

    =
    2mV
    0·5mm

    = 1V/mm.

  1. Which of the following frequency meters is suitable for measuring radio frequency?








  1. View Hint View Answer Discuss in Forum

    Hetrodyne frequency meter is suitable for measuring RF (radio frequency).

    Correct Option: D

    Hetrodyne frequency meter is suitable for measuring RF (radio frequency).

  1. The purpose of the delay line is to retard the arrival of the input waveform at the:








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    The purpose of the delay line is to retard the arrival of the input waveform at the vertical deflection plates until the sweep is started.

    Correct Option: A

    The purpose of the delay line is to retard the arrival of the input waveform at the vertical deflection plates until the sweep is started.