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ECE :: Measurements and Instrumentation

Measurements and Instrumentation - Section 1
Measurements and Instrumentation - Section 2
Measurements and Instrumentation - Section 3
Measurements and Instrumentation - Section 4
Measurements and Instrumentation - Section 5
Measurements and Instrumentation - Section 6
Measurements and Instrumentation - Section 7
Measurements and Instrumentation - Section 8
Measurements and Instrumentation - Section 9
Measurements and Instrumentation - Section 10
Measurements and Instrumentation - section-11
Measurements and Instrumentation - Section-12

  1. The numbers of accelerating anodes in a CRO is

    2. A.
    1
    B.
    2
    C.
    3
    D.
    4

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  2. Consider the following statements regarding phase sensitive detector

    1. The detector reads zero when phases of input signal and reference signal are different.
    2. The detector acts as a linear rectifier.
    3. The detector can be used as vector voltmeter.
    Of the above statements which are correct?

    3. A.
    1, 2, 3
    B.
    1 and 2
    C.
    2 and 3
    D.
    1 and 3

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  3. In a Weston synchronoscope, the moving coil is connected across

    4. A.
    bus bar
    B.
    incoming alternator
    C.
    lamp
    D.
    fixed coils

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  4. The coding system generally used in digital telemetry is

    5. A.
    PPM (Pulse position modulation)
    B.
    PAM (Pulse amplitude modulation)
    C.
    PCM (Pulse code modulation)
    D.
    PDM (Pulse duration modulation)

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  5. The advantage of semiconductor strain gauge over resistance strain gauge is

    6. A.
    it is more sensitve
    B.
    it is more linear
    C.
    it is less temperature dependent
    D.
    it is cheaper

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  6. The advantage of LVDT over inductive bridge type transducer is that

    7. A.
    it gives high output for small changes in core position
    B.
    it can be used over a temperature range of - 265°C to 600°C
    C.
    it can measure displacement of moving object
    D.
    the error due to stray magnetic field is less

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  7. In a Weston synchronoscope the deflecting torque is zero when

    8. A.
    currents in fixed and moving coils are in phase
    B.
    currents in fixed and moving coils are out of phase by 90°
    C.
    currents in fixed and moving coils are out of phase by 60°
    D.
    none of the above

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  8. Assertion (A): Megger is used to check insulation resistance of cables.

    Reason (R): Insulation resistance of cables is very high.

    9. 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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  9. Assertion (A): A power factor meter operates on dynamometer principle.

    Reason (R): A power factor meter does not have a control spring.

    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

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  10. Assertion (A): A radiation pyrometer is very suitable for high temperature measurement.

    Reason (R): When temperature is high, a physical contact between hot body and thermometer is not desirable.

    11. 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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