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ECE :: Measurements and Instrumentation

  1. The scale of moving iron instrument is linear.

  2. A.
    True
    B.
    False

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  3. With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is

  4. A.
    36
    B.
    60
    C.
    360
    D.
    3600

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  5. When measuring phase angle between two waves using a CRO, the time base generator is connected to

  6. A.
    X plate
    B.
    Y plate
    C.
    both X and Y plate
    D.
    neither X nor Y plates

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  7. It is required that a strain gauge has gauge factor of 100. The proper strain gauge is

  8. A.
    constantan strain gauge
    B.
    nichrome strain gauge
    C.
    semiconductor strain gauge
    D.
    alloy strain gauge

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  9. A meter having 0-1000 μA range and 1000 Ω resistance is required to be changed to 0-100 mA meter. The value of shunt resistance is about

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

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  11. An induction wattmeter can be used for

  12. A.
    dc only
    B.
    50 Hz ac only
    C.
    both ac and dc
    D.
    high frequency ac only

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  13. In the balanced bridge shown in figure. X should be

  14. A.
    a self inductance having resistance
    B.
    a capacitance
    C.
    a non-inductive resistance
    D.
    an inductance and capacitance in parallel

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  15. If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is

  16. A.
    80°
    B.
    10°
    C.
    100°
    D.
    170°

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  17. In an induction wattmeter, the shading bands are made of non conducting material.

  18. A.
    True
    B.
    False

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