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MCQs

Total Questions : 374 | Page 1 of 38 pages
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
Answer: Option C. -> Shunt capacitance
Question 4. 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
 Discuss Question
Answer: Option C. -> The error is high due to hysteresis effect
Question 5. Which of the following meters has a linear scale?
  1.    Thermocouple meter
  2.    Moving iron meter
  3.    Hot wore meter
  4.    Moving coil meter
 Discuss Question
Answer: Option D. -> Moving coil meter
Question 6. For handling greater currents induction watt-meters are used in conjunction with
  1.    Potential transformers
  2.    Current transformers
  3.    Power transformers
  4.    Either of the above
 Discuss Question
Answer: Option B. -> Current transformers
Question 7. When using ohmmeter, applied voltage is to be disconnected from the circuit because
  1.    Voltage source will increase resistance
  2.    Current will decrease resistance
  3.    The ohmmeter has its own internal battery
  4.    None of the above
 Discuss Question
Answer: Option C. -> The ohmmeter has its own internal battery
Question 8. A 10MHz CRO has
  1.    5MHz sweep
  2.    10MHz vertical oscillator
  3.    10MHz horizontal oscillator
  4.    10MHz supply frequency
 Discuss Question
Answer: Option C. -> 10MHz horizontal oscillator
Question 9. A CRO can display
  1.    AC signals
  2.    DC signals
  3.    Both AC and DC signals
  4.    Time invariant signals
 Discuss Question
Answer: Option C. -> Both AC and DC signals
Question 10. A galvanometer has
  1.    Air friction damping
  2.    Fluid friction damping
  3.    Spring coil damping
  4.    Eddy current damping
 Discuss Question
Answer: Option D. -> Eddy current damping

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