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ECE :: Measurements and Instrumentation

  1. LVDT is a

  2. A.
    pressure transducer
    B.
    displacement transducer
    C.
    velocity transducer
    D.
    acceleration transducer

  3. A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is

  4. A.
    3%
    B.
    2%
    C.
    1.5%
    D.
    .75%

  5. In Schering bridge, the potential of detector above earth potential is about

  6. A.
    a few volts
    B.
    10 kV
    C.
    1000 V
    D.
    either (a) or (b)

  7. The dimensions of EMF are

  8. A.
    ML2I-1T-3
    B.
    M-1T-3
    C.
    ML2I-2T-3
    D.
    ML3I-1T-3

  9. Which of the following instruments has non-linear scale?

    1. Moving coil instrument
    2. Moving iron instrument
    3. Electrostatic instrument
    4. Rectifier instrument
    Select the answer as per following codes

  10. A.
    2 only
    B.
    2 and 3 only
    C.
    2, 3 and 1
    D.
    1, 2, 3 and 4

  11. The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is

  12. A.
    ± 7.55%
    B.
    ± 3.77%
    C.
    ± 11.32%
    D.
    ± 15.09%

  13. A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

  14. A.
    20 kΩ
    B.
    19.9 kΩ
    C.
    1.9 kΩ
    D.
    20.1 kΩ

  15. Which of these has a magnetic brake?

  16. A.
    Thermocouple ammeter
    B.
    Energy meter
    C.
    Dynamometer wattmeter
    D.
    Frequency meter

  17. Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is

  18. A.
    760 ± 8
    B.
    760 ± 2
    C.
    760 + 8
    D.
    760 - 8

  19. Assertion (A): Schering bridge is a low voltage bridge.

    Reason (R): Schering bridge is very commonly used for measurement of capacitance.

  20. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not correct explanation of A
    C.
    A is true R is false
    D.
    A is false R is true