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MCQs

Total Questions : 103 | Page 9 of 11 pages
Question 81. Two watt meters, which are connected to measure the total power on a three-phase system supplying a balanced load, read 10.5 kW and – 2.5 kW respectively. What is the total power?
  1.    13.0 kW
  2.    13.0 kW
  3.    8.0 kW
  4.    8.0 kW
 Discuss Question
Answer: Option D. -> 8.0 kW
Answer: (d).8.0 kW
Question 82. Power flowing in 3-phase, 3-wire system is measured by two wattmeter whose readings are 7000 W and -2500 W. If the voltage of the circuit is 400 V, then what will be the value of capacitance introduced in each phase to make one wattmeter reads zero? The frequency is 50 Hz.
  1.    500 μF
  2.    668.6 μF
  3.    1000 μF
  4.    748.5 μF
 Discuss Question
Answer: Option B. -> 668.6 μF
Answer: (b).668.6 μF
Question 83. The two-wattmeter method is used to measure active power. The system is a 3-phase, 3- wire system. Then, the power reading is?
  1.    Affected by both negative sequence and zero sequence voltages
  2.    Affected by negative sequence voltages but not by zero sequence voltages
  3.    Affected by zero sequence voltages but not by negative sequence voltages
  4.    Not affected by negative or zero sequence voltages
 Discuss Question
Answer: Option D. -> Not affected by negative or zero sequence voltages
Answer: (d).Not affected by negative or zero sequence voltages
Question 84. A single-phase load is connected between R and Y terminals of a 220 V, symmetrical, 3-phase, 4 wire systems with phase sequence RYB. A watt-meter is connected in the system. The watt-meter will read (pf = 0.8 lagging)?
  1.    – 795 W
  2.    – 168 W
  3.    + 597 W
  4.    + 795 W
 Discuss Question
Answer: Option B. -> – 168 W
Answer: (b).– 168 W
Question 85. The ratio of the reading of 2 watt-meters connected to measure power in a balanced 3-phase load is 2: 1 and the load is inductive. The power factor of load is?
  1.    0.866 lag
  2.    0.615 lead
  3.    0.866 lead
  4.    0.625 lag
 Discuss Question
Answer: Option A. -> 0.866 lag
Answer: (a).0.866 lag
Question 86. A dynamometer type wattmeter consists of ________
  1.    only potential coil
  2.    potential and current coils
  3.    only current coil
  4.    no coils
 Discuss Question
Answer: Option B. -> potential and current coils
Answer: (b).potential and current coils
Question 87. When a current carrying coil is placed in the magnetic field?
  1.    no force is exerted
  2.    voltage is produced
  3.    power is generated
  4.    a force is exerted
 Discuss Question
Answer: Option D. -> a force is exerted
Answer: (d).a force is exerted
Question 88. Controlling torque is provided by gold springs.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 89. In a Dynamometer type wattmeter, the fixed coil is split into ________
  1.    4
  2.    3
  3.    2
  4.    1
 Discuss Question
Answer: Option C. -> 2
Answer: (c).2
Question 90. When the moving coil in a Dynamometer type wattmeter deflects ________
  1.    pointer moves
  2.    pointer doesn’t move
  3.    current flows
  4.    voltage is generated
 Discuss Question
Answer: Option A. -> pointer moves
Answer: (a).pointer moves

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