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ECE :: Measurements and Instrumentation

  1. The output of a Piezoelectric crystal has

  2. A.
    low amplitude and low impedance
    B.
    high amplitude and low impedance
    C.
    low amplitude and high impedance
    D.
    high amplitude and high impedance

  3. The pressure coil of a wattmeter should be connected to the supply side of the current coil when

  4. A.
    load impedance in high
    B.
    load impedance is low
    C.
    voltage is high
    D.
    voltage is low

  5. A universal RLC bridge uses

  6. A.
    Maxwell bridge for measurement of inductance and De Sauty's bridge for measurement of capacitance
    B.
    Maxwell's bridge for measurement of inductance and modified De Sauty bridge for measurement of capacitance
    C.
    Maxwell Wien bridge for measurement of inductance and modified De Sauty bridge for measurement of inductance
    D.
    Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance

  7. If φsh is flux of shunt magnet, φse is flux of series magnet, ish is eddy current due to φse, the torque in an induction wattmeter is proportional to

  8. A.
    φse ise + φsh ish
    B.
    φsh ise - φse ish
    C.
    φsh ish - φse ise
    D.
    φsh ish + φse ise

  9. If C is spring constant and θ is deflection, controlling torque is

  10. A.
    B.
    C/θ
    C.
    θ/C
    D.
    C2θ

  11. The operating voltage of a megger is about

  12. A.
    100 V
    B.
    12 V
    C.
    6 V
    D.
    1 V

  13. An ohmmeter is a

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

  15. Loading effect is primarily caused by instruments having

  16. A.
    high resistance
    B.
    high sensitivity
    C.
    low sensitivity
    D.
    high range

  17. Capacitive transducer is superior to inductive type for measurement of capacitance because of

  18. A.
    absence of non-linearity
    B.
    high frequency response
    C.
    small size
    D.
    high accuracy

  19. Which of the following effects is used in measurement of magnetic flux?

  20. A.
    Hall effect
    B.
    Seeback effect
    C.
    Piezo electric effect
    D.
    Photoelectric effect