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ECE :: Measurements and Instrumentation

  1. A single phase energy meter operates on induction principle.

  2. A.
    True
    B.
    False

  3. The accuracy of measurement using CRO is about

  4. A.
    ± 0.5%
    B.
    ± 0.05 %
    C.
    ± 1%
    D.
    ± 3%

  5. The channel required for FM telemetry is

  6. A.
    same as required for AM telemetry
    B.
    smaller than that required by AM telemetry
    C.
    100 times that required for AM telemetry
    D.
    10 times that required for AM telemetry

  7. Assertion (A): Absolute instruments are used in standard laboratories.

    Reason (R): Absolute instruments do not require calibration.

  8. 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

  9. Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.

    Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.

  10. 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

  11. A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is

  12. A.
    0.001
    B.
    1000
    C.
    2 digit
    D.
    1 mV

  13. The most serious problems in ac bridge measurement is

  14. A.
    eddy currents
    B.
    leakage current
    C.
    residual magnetism
    D.
    stray fields

  15. Assertion (A): An electrostatic voltmeter is free from hysteresis and eddy current errors.

    Reason (R): An electrostatic voltmeter has a number of fixed and moving vanes in parallel.

  16. 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

  17. The pointer of an indicating instrument should be

  18. A.
    very light
    B.
    very heavy
    C.
    neither heavy nor light
    D.
    heavy

  19. The resistance of resistance strain gauge is about

  20. A.
    5 Ω
    B.
    50 Ω
    C.
    120 Ω
    D.
    0.5 Ω