Measurement And Instrumentation(Electrical Engineering ) Questions and Answers

Question 1. One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
  1.    1
  2.    0.84
  3.    0.73
  4.    0.65
Explanation:-
Answer: Option B. -> 0.84
Question 2. The spring material used in a spring control device should have the following property.
  1.    Should be nonmagnetic
  2.    Most be of low temperature coefficient
  3.    Should have low specific resistance
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 3. A moving iron ammeter may be compensated for frequency errors by
  1.    A shunt resistance
  2.    A series inductance
  3.    Shunt capacitance
  4.    Series resistance
Explanation:-
Answer: Option C. -> Shunt capacitance
Question 4. Which of the following meters has a linear scale?
  1.    Thermocouple meter
  2.    Moving iron meter
  3.    Hot wore meter
  4.    Moving coil meter
Explanation:-
Answer: Option D. -> Moving coil meter
Question 5. Why is a MISC meter not recommended for DC measurement?
  1.    The meter is calibrated for AC and it’s error for DC would be high
  2.    The meter does not respond to DC signals
  3.    The error is high due to hysteresis effect
  4.    The error is high due to eddy current effect
Explanation:-
Answer: Option C. -> The error is high due to hysteresis effect
Question 6. The problem of Electrostatic coupling in a transformer is acute at
  1.    Low frequencies
  2.    Power frequencies
  3.    High frequencies
  4.    High load on the transformer
Explanation:-
Answer: Option C. -> High frequencies
Question 7. Electrostatic instruments are normally used for
  1.    Low current measurements
  2.    High current measurements
  3.    Low voltage measurements
  4.    High voltage measurements
Explanation:-
Answer: Option D. -> High voltage measurements
Question 8. Which meter is suitable for the measurement of 10mV at 50MHz?
  1.    Moving iron voltmeter
  2.    VTVM
  3.    Moving coil voltmeter
  4.    CRO
Explanation:-
Answer: Option D. -> CRO
Question 9. Which of the following devices should be used for accurate measurement of low D.C. voltage?
  1.    Small range moving coil voltmeter
  2.    D.C. potentiometer
  3.    Small range thermocouple voltmeter
  4.    None of the above
Explanation:-
Answer: Option B. -> D.C. potentiometer
Question 10. An instrument to be used for measurement and control should preferably have
  1.    Dead zone and dead time
  2.    Linear output and fast response
  3.    Non-linear output
  4.    A highly damped response
Explanation:-
Answer: Option B. -> Linear output and fast response
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