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MCQs

Total Questions : 117 | Page 4 of 12 pages
Question 31. A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type AC voltmeter connected in parallel. If the meter readings are Va and Vb respectively. Then the form factor may be estimated as?
  1.    \(\frac{V_a}{V_b}\)
  2.    \(\frac{1.11 V_a}{V_b}\)
  3.    \(\frac{\sqrt{2} V_a}{V_b}\)
  4.    \(\frac{π V_a}{V_b}\)
 Discuss Question
Answer: Option B. -> \(\frac{1.11 V_a}{V_b}\)
Answer: (b).\(\frac{1.11 V_a}{V_b}\)
Question 32. A PMMC rated as 100 μA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?
  1.    4.5 kΩ/V
  2.    18 kΩ/V
  3.    10 kΩ/V
  4.    9 kΩ/V
 Discuss Question
Answer: Option D. -> 9 kΩ/V
Answer: (d).9 kΩ/V
Question 33. A moving iron ammeter produces a full-scale torque of 240 μN-m with a deflection of 120° at a current of 10 A. the rate of change of self-inductance (μH/rad) of the instrument at full scale is?
  1.    2.0 μH/rad
  2.    4.8 μH/rad
  3.    12.0 μH/rad
  4.    114.6 μH/rad
 Discuss Question
Answer: Option B. -> 4.8 μH/rad
Answer: (b).4.8 μH/rad
Question 34. A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?
  1.    0.0216 N-m
  2.    0.0456 N-m
  3.    0.1448 N-m
  4.    1 N-m
 Discuss Question
Answer: Option A. -> 0.0216 N-m
Answer: (a).0.0216 N-m
Question 35. Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?
  1.    10 kΩ/V and 10 kΩ/V
  2.    100 kΩ/V and 10 kΩ/V
  3.    10 kΩ/V and 100 kΩ/V
  4.    10 kΩ/V and 1 kΩ/V
 Discuss Question
Answer: Option A. -> 10 kΩ/V and 10 kΩ/V
Answer: (a).10 kΩ/V and 10 kΩ/V
Question 36. What is the current transformer?
  1.    transformer used with an A.C. ammeter
  2.    transformer used with an D.C. ammeter
  3.    transformer used with an A.C. voltmeter
  4.    transformer used with an D.C. voltmeter
 Discuss Question
Answer: Option A. -> transformer used with an A.C. ammeter
Answer: (a).transformer used with an A.C. ammeter
Question 37. What is the potential transformer?
  1.    transformer used with an D.C. ammeter
  2.    transformer used with an A.C. voltmeter
  3.    transformer used with an D.C. ammeter
  4.    transformer used with an A.C. voltmeter
 Discuss Question
Answer: Option D. -> transformer used with an A.C. voltmeter
Answer: (d).transformer used with an A.C. voltmeter
Question 38. C.T. and P.T. are used for _________
  1.    measuring low current and voltages
  2.    measuring very low current and voltages
  3.    measuring high currentsand voltages
  4.    measuring intermediate currents and voltages
 Discuss Question
Answer: Option C. -> measuring high currentsand voltages
Answer: (c).measuring high currentsand voltages
Question 39. The secondary winding of a C.T. has _________
  1.    a large number of turns
  2.    a few turns
  3.    no turns at all
  4.    intermediate number of turns
 Discuss Question
Answer: Option A. -> a large number of turns
Answer: (a).a large number of turns
Question 40. The primary winding of a C.T. has _________
  1.    a larger number of turns
  2.    no turns at all
  3.    intermediate number of turns
  4.    a few turns
 Discuss Question
Answer: Option D. -> a few turns
Answer: (d).a few turns

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