Electronic measurements and instrumentation miscellaneous

Electronic measurements and instrumentation miscellaneous

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Electronic Measurements And Instrumentation

Electronic measurements and instrumentation miscellaneous
  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:








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    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. 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. 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?








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    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. Which bridge is used for measuring audio and H.F. oscillations?








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    Wein bridge is used for measuring audio and High frequency (H.F.) oscillations.

    Correct Option: A

    Wein bridge is used for measuring audio and High frequency (H.F.) oscillations.

  1. The shunt type ohmmeter is NOT suitable for high resistance measurements because:








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    The shunt type ohm meter is not suitable for high resistance measurements because scale is highly cramped for high resistance values.

    Correct Option: B

    The shunt type ohm meter is not suitable for high resistance measurements because scale is highly cramped for high resistance values.