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  • Question
  • An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is


  • Options
  • A. 0.1 V/mm
  • B. 0.5 V/mm
  • C. 1 V/mm
  • D. 5 V/mm

  • Correct Answer
  • 1 V/mm 

    Explanation
    Final output = 2 x 10-3 x 250 = 0.5 V.

    An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gai.


    Measurements and Instrumentation problems


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    • 1. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

    • Options
    • A. 2%
    • B. 2.5%
    • C. 4%
    • D. 5%
    • Discuss
    • 2. A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is

    • Options
    • A. 1 mV/pC
    • B. 1.5 mV/pC
    • C. 2.5 mV/pC
    • D. 4 mV/pC
    • Discuss
    • 3. As per BIS there are 6 accuracy classes of instruments.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. A moving coil instrument has a resistance of 0.5 ? and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be

    • Options
    • A. 0.004 ?
    • B. 0.005 ?
    • C. 0.05 ?
    • D. 0.1 ?
    • Discuss
    • 5. In figure, Z1 = 200?60° ?, Z2 = 400? - 90° ?, Z3 = 300?0°. Then Z4 for bridge to be balanced is

    • Options
    • A. 150?30° ?
    • B. 400? - 90° ?
    • C. 300?90° ?
    • D. 600? - 150° ?
    • Discuss
    • 6. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

    • Options
    • A. when power factor is less than 0.5 lagging
    • B. when power factor is greater than 0.5 lagging
    • C. when power factor is less than 0.5
    • D. when power factor is unity
    • Discuss
    • 7. The household energy meter is

    • Options
    • A. indicating instrument
    • B. recording instrument
    • C. integrating instrument
    • D. none of the above
    • Discuss
    • 8. Induction wattmeter can be used in

    • Options
    • A. ac circuit only
    • B. dc circuit only
    • C. both ac and dc circuit
    • D. ac 3 phase only
    • Discuss
    • 9. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

    • Options
    • A. 1.39 V
    • B. 0.75 V
    • C. 13.9 V
    • D. 7.45 V
    • Discuss
    • 10. To increase Q factor of a coil, the wire should be

    • Options
    • A. long
    • B. thin
    • C. thick
    • D. long and thin
    • Discuss


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