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MCQs

Total Questions : 103 | Page 8 of 11 pages
Question 71. Power is ___________
  1.    rate of doing work
  2.    rate of producing voltage
  3.    rate of generating current
  4.    rate of overcoming friction
 Discuss Question
Answer: Option A. -> rate of doing work
Answer: (a).rate of doing work
Question 72. In A.C. circuits, power consumed is ________
  1.    product of voltage and current
  2.    it depends on the p.f. of the circuit in addition to voltage and current
  3.    it depends on the supply voltage
  4.    it depends on the magnitude of the circuit current
 Discuss Question
Answer: Option B. -> it depends on the p.f. of the circuit in addition to voltage and current
Answer: (b).it depends on the p.f. of the circuit in addition to voltage and current
Question 73. In A.C. circuits, power is measured using ________
  1.    voltmeter
  2.    ammeter
  3.    ohmmeter
  4.    wattmeter
 Discuss Question
Answer: Option D. -> wattmeter
Answer: (d).wattmeter
Question 74. A wattmeter consists of a current coil and a potential coil.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 75. In D.C. circuits, power is measured using ________
  1.    ohmmeter and galvanometer
  2.    ohmmeter and voltmeter
  3.    ammeter and voltmeter
  4.    ammeter and galvanometer
 Discuss Question
Answer: Option C. -> ammeter and voltmeter
Answer: (c).ammeter and voltmeter
Question 76. Energy meter creeps __________
  1.    due to change in supply
  2.    due to reversal in polarity of voltage
  3.    due to asymmetry in magnetic circuit
  4.    due to turns ratio of transformer
 Discuss Question
Answer: Option C. -> due to asymmetry in magnetic circuit
Answer: (c).due to asymmetry in magnetic circuit
Question 77. Supply voltage in an energy meter is __________
  1.    constant always
  2.    zero always
  3.    depends on the load
  4.    can fluctuate
 Discuss Question
Answer: Option D. -> can fluctuate
Answer: (d).can fluctuate
Question 78. How can temperature effect be compensated in an energy meter?
  1.    through heat sinks
  2.    by a temperature shunt
  3.    by using resistance
  4.    by using a coolant
 Discuss Question
Answer: Option B. -> by a temperature shunt
Answer: (b).by a temperature shunt
Question 79. Disc rotates slowly in some energy meters.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 80. How is the flux of shunt coil related to voltage?
  1.    flux is proportional to square of voltage
  2.    directly proportional
  3.    inversely proportional
  4.    independent of each other
 Discuss Question
Answer: Option A. -> flux is proportional to square of voltage
Answer: (a).flux is proportional to square of voltage

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