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MCQs

Total Questions : 117 | Page 5 of 12 pages
Question 41. Instrument transformers give same readings irrespective of number of other instruments connected.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 42. C.T. and P.T. are standardized at _________
  1.    50 A and 220 V
  2.    25 mA and 2.2 kV
  3.    5 A and 110 V
  4.    75 nA and 1.1 MV
 Discuss Question
Answer: Option C. -> 5 A and 110 V
Answer: (c).5 A and 110 V
Question 43. How can the meter circuit be isolated from the power circuit?
  1.    by grounding
  2.    through electrical isolation
  3.    by physical separation
  4.    through mechanical isolation
 Discuss Question
Answer: Option B. -> through electrical isolation
Answer: (b).through electrical isolation
Question 44. A 110V voltmeter can measure a voltage of upto 110kV using a _________
  1.    110000/110V P.T.
  2.    110000V P.T.
  3.    110V P.T.
  4.    110/110000V P.T.
 Discuss Question
Answer: Option A. -> 110000/110V P.T.
Answer: (a).110000/110V P.T.
Question 45. A 5A ammeter can measure a current of upto 1000 A using a _________
  1.    5/1000A C.T.
  2.    1000A C.T.
  3.    5A C.T.
  4.    1000/5A C.T.
 Discuss Question
Answer: Option D. -> 1000/5A C.T.
Answer: (d).1000/5A C.T.
Question 46. How are instrument transformers different from shunts and multipliers?
  1.    they are all the same
  2.    they have transformers
  3.    readings are independent of component values
  4.    they can be used for high voltages and currents
 Discuss Question
Answer: Option C. -> readings are independent of component values
Answer: (c).readings are independent of component values
Question 47. Transformation ratio of an instrument is defined as ____________
  1.    ratio of primary to secondary phasor
  2.    ratio of secondary to primary phasor
  3.    reciprocal of the primary phasor
  4.    reciprocal of the secondary phasor
 Discuss Question
Answer: Option A. -> ratio of primary to secondary phasor
Answer: (a).ratio of primary to secondary phasor
Question 48. For a C.T. the transformation ratio is given by which of the following relation?
  1.    R = \(\frac{I_s}{I_p}\)
  2.    R = \(\frac{I_p}{I_s}\)
  3.    R = \(\frac{1}{I_p}\)
  4.    R = Iₚ
 Discuss Question
Answer: Option B. -> R = \(\frac{I_p}{I_s}\)
Answer: (b).R = \(\frac{I_p}{I_s}\)
Question 49. For a P.T. the transformation ratio is given by which of the following relation?
  1.    R = \(\frac{V_s}{V_p}\)
  2.    R = \(\frac{1}{V_s}\)
  3.    R = \(\frac{V_p}{V_s}\)
  4.    R = Vₚ
 Discuss Question
Answer: Option C. -> R = \(\frac{V_p}{V_s}\)
Answer: (c).R = \(\frac{V_p}{V_s}\)
Question 50. Nominal ratio of an instrument transformer is defined as the __________
  1.    reciprocal of the rated primary value
  2.    ratio of rated secondary value to primary value
  3.    reciprocal of the rated secondary value
  4.    ratio of rated primary value to secondary value
 Discuss Question
Answer: Option D. -> ratio of rated primary value to secondary value
Answer: (d).ratio of rated primary value to secondary value

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