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MCQs

Total Questions : 117 | Page 9 of 12 pages
Question 81. For a given Vₚ the Vₛ __________
  1.    increases
  2.    decreases
  3.    remains constant
  4.    depends on the supply
 Discuss Question
Answer: Option B. -> decreases
Answer: (b).decreases
Question 82. What is effect of the secondary burden on the ratio error?
  1.    ratio error is constant with secondary burden
  2.    ratio error decreases with secondary burden
  3.    ratio error increases with secondary burden
  4.    depends on the supply voltage
 Discuss Question
Answer: Option C. -> ratio error increases with secondary burden
Answer: (c).ratio error increases with secondary burden
Question 83. What is the effect of p.f. on secondary burden?
  1.    Iₚ shifts towards I₀
  2.    Iₚ deviates from I₀
  3.    Iₚ is independent of I₀
  4.    Iₚ and I₀ cancel each other
 Discuss Question
Answer: Option A. -> Iₚ shifts towards I₀
Answer: (a).Iₚ shifts towards I₀
Question 84. Vₚ is leading in phase, while Vₛ is lagging in phase.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 85. How is the transformation ratio dependent on the secondary burden?
  1.    decreases
  2.    increases
  3.    remains constant
  4.    depends on the supply
 Discuss Question
Answer: Option B. -> increases
Answer: (b).increases
Question 86. Decrease in p.f. makes Vₛ to lead Vₚ.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 87. A 50 Hz, bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1 Ω. The magnetizing ampere-turns are 200. What is the ratio error at full load, if the iron loss is 1.5 W and magnetizing mmf is 100 A?
  1.    Zero
  2.    45 μWb
  3.    25.5 μWb
  4.    100 μWb
 Discuss Question
Answer: Option B. -> 45 μWb
Answer: (b).45 μWb
Question 88. At constant voltage how is frequency affected by flux?
  1.    decreases with an increase in flux
  2.    increases with a decrease in flux
  3.    remains constant
  4.    depends on the current
 Discuss Question
Answer: Option B. -> increases with a decrease in flux
Answer: (b).increases with a decrease in flux
Question 89. A 50 Hz, bar primary CT has a secondary with 800 turns. The secondary supplies 7 A current into a purely resistive burden of 2 Ω. The magnetizing ampere-turns are 300. The phase angle is?
  1.    3.1°
  2.    85.4°
  3.    94.6°
  4.    175.4°
 Discuss Question
Answer: Option A. -> 3.1°
Answer: (a).3.1°
Question 90. A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 1.6Ω. The flux in the core at full load is?
  1.    160 μWb
  2.    180 μWb
  3.    200 μWb
  4.    150 μWb
 Discuss Question
Answer: Option B. -> 180 μWb
Answer: (b).180 μWb

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