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MCQs

Total Questions : 1232 | Page 7 of 124 pages
Question 61. Operating torques in analogue instruments are
  1.    deflecting and control
  2.    deflecting and damping
  3.    deflecting, control and damping
  4.    vibration and balancing
 Discuss Question
Answer: Option C. -> deflecting, control and damping
Question 62. The principle on which vector voltmeter is based is
  1.    that it works on the principle of complex variation
  2.    that it measures the response of linear ramp voltage
  3.    same as digital meter
  4.    that it measures the amplitude of a single at two points and at the same time measures their phase difference
 Discuss Question
Answer: Option D. -> that it measures the amplitude of a single at two points and at the same time measures their phase difference
Question 63. Which of the following is the major consideration to evolve a good design ?
  1.    Cost
  2.    Durability
  3.    Compliance with performance criteria as laid down in specifications
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 64. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
  1.    single-phase winding
  2.    two-phase winding
  3.    three-phase winding
  4.    any of the above
 Discuss Question
Answer: Option B. -> two-phase winding
Question 65. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
  1.    Increased I R losses
  2.    Increased core losses
  3.    Poor commutation
  4.    Change in motor parameters
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 66. The cylindrical windings using circular conductors are used for current rating of
  1.    upto 20 A
  2.    upto 40 A
  3.    upto 60 A
  4.    upto 80 A
 Discuss Question
Answer: Option D. -> upto 80 A
Question 67. The forced oil and air circulation method is usual one for transformers of capacities
  1.    upto 5 MVA
  2.    upto 10 MVA
  3.    upto 20 MVA
  4.    30 MVA upwards
 Discuss Question
Answer: Option D. -> 30 MVA upwards
Question 68. In an energy meter braking torque is produced to
  1.    safe guard it against creep
  2.    brake the instrument
  3.    bring energy meter to stand still
  4.    maintain steady speed and equal to driving torque
 Discuss Question
Answer: Option D. -> maintain steady speed and equal to driving torque
Question 69. In a portable instrument, the controlling torque is provided by
  1.    spring
  2.    gravity
  3.    eddy currents
  4.    all of the above
 Discuss Question
Answer: Option A. -> spring
Question 70. In a meggar controlling torque is provided by
  1.    spring
  2.    gravity
  3.    coil
  4.    eddy current
 Discuss Question
Answer: Option C. -> coil

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