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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. A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be

    2. A.
    0.004 Ω
    B.
    0.005 Ω
    C.
    0.05 Ω
    D.
    0.1 Ω

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  2. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because

    3. A.
    it loads the circuit to maximum extent
    B.
    it loads the circuit moderately
    C.
    it does not load the circuit at all
    D.
    it uses centre zero galvanometer instead of Voltmeters

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  3. Assertion (A): A hot wire ammeter has a cramped scale.

    Reason (R): The heat is proportional to square of current.

    4. 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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  4. Which of the following is true about an impulse voltage?

    5. A.
    It is a unidirectional voltage
    B.
    Chopped impulse flashover does not occur
    C.
    Time taken to rise is equal to time taken to fall
    D.
    RMS value is always less than 50% of average value

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  5. Which of the following are needed both for protection and metering?

    6. A.
    Wattmeters
    B.
    Instrument transformers
    C.
    Energy meters
    D.
    Power factor meters

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  6. A digital frequency counter can be converted to DVM by addition of a suitable

    7. A.
    voltage controlled oscillator
    B.
    D/A converter
    C.
    power amplifier
    D.
    operational amplifier

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  7. A dynamometer wattmeter is connected in ac circuit. The reading will be

    8. A.
    V-A product
    B.
    average power
    C.
    peak power
    D.
    instantaneous power

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  8. The speed transducer using a drag cup rotor has the main advantage of

    9. A.
    very high accuracy
    B.
    low energy requirement
    C.
    cheap construction
    D.
    all of the above

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  9. A voltmeter using thermocouples measures

    10. A.
    rms value
    B.
    peak value
    C.
    average value
    D.
    peak to peak value

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  10. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?

    11. A.
    Measurement of unknown voltage
    B.
    Measurement of resistance
    C.
    Measurement of unknown current
    D.
    Calibration of voltmeter

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