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ECE :: Measurements and Instrumentation

  1. Two wattmeter method for 3 phase power measurement can be used only for

  2. A.
    balanced loads
    B.
    unbalanced loads
    C.
    both balanced and unbalanced loads
    D.
    star connected loads

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  3. A coil resonates at 1 MHz with a resonating capacitance of 72 pF. At 500 pF, resonance is obtained with a resonating capacitor of 360 pF. The self capacitance of coil is

  4. A.
    12 pF
    B.
    24 pF
    C.
    30 pF
    D.
    72 pF

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  5. A peak responding ac voltmeter using a half wave rectifier has been calibrated to read 1 V for 1 V rms sine wave input. If input is 1 V dc the reading will be

  6. A.
    0.707 V
    B.
    0.707 or 0 V
    C.
    1.414 V
    D.
    1.414 or 0 V

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  7. For measuring inductance with high Q, we should use

  8. A.
    Maxwell's bridge
    B.
    Maxwell Wien bridge
    C.
    Hay's bridge
    D.
    Either (a) or (b)

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  9. A resistance strain gauge has a resistance of about

  10. A.
    100 Ω
    B.
    25 Ω
    C.
    10 Ω
    D.
    1 Ω

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  11. Assertion (A): The speed of a shaft can be measured by using a dc tacho generator.

    Reason (R): A two phase servometer can also be used as a speed transducer.

  12. 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

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  13. The circuit of figure is used to measure the value Rx. Ammeter resistance Ra = 0.1 Ω voltmeter resistance Rv = 5000 Ω. It Rx1 and Rx2, are the measured values of Rx with switch in position 1 and 2, the mean of Rx1, and Rx2, is

  14. A.
    9.98 Ω
    B.
    10 Ω
    C.
    10.04 Ω
    D.
    10.1 Ω

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  15. A Weston frequency meter is

  16. A.
    moving coil instrument
    B.
    moving iron instrument
    C.
    dynamometer instrument
    D.
    induction instrument

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  17. The 10 MHz in the specification of CRO means that

  18. A.
    the sweep frequency is 10 MHz
    B.
    the frequency of input signal should not be more than 10 MHz
    C.
    the vertical amplifier has been designed for 10 MHz
    D.
    none of the above

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  19. Rayleigh current balance is an absolute instrument.

  20. A.
    True
    B.
    False

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