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MCQs

Total Questions : 206 | Page 7 of 21 pages
Question 61. The ground wire should not be smaller than No ______ copper.
  1.    2
  2.    4
  3.    6
  4.    10
 Discuss Question
Answer: Option D. -> 10
Question 62. Directional relays are based on flow of
  1.    power
  2.    current
  3.    voltage wave
  4.    all of the above
 Discuss Question
Answer: Option A. -> power
Question 63. Admittance relay is _______ relay.
  1.    impedance
  2.    directional
  3.    non-directional
  4.    none of the above
 Discuss Question
Answer: Option B. -> directional
Question 64. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
  1.    recovery
  2.    surge
  3.    operating
  4.    arc
  5.    none of the above
 Discuss Question
Answer: Option A. -> recovery
Question 65. The material used for fuse must have
  1.    low melting point and high specific resistance
  2.    low melting point and -low specific resistance
  3.    high melting point and low specific resistance
  4.    low melting point and any specific resistance
 Discuss Question
Answer: Option B. -> low melting point and -low specific resistance
Question 66. For cost and safety, the outdoor substations are installed for voltages above
  1.    11 kV
  2.    33 kV
  3.    60 kV
  4.    110 kV
 Discuss Question
Answer: Option B. -> 33 kV
Question 67. The torque produced in induction type relay (shaded pole structure) is
  1.    inversely proportional to the current
  2.    inversely proportional to the square of the current
  3.    proportional to the current
  4.    proportional to square of the current
 Discuss Question
Answer: Option B. -> inversely proportional to the square of the current
Question 68. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
  1.    Zero
  2.    Unity
  3.    Infinity
  4.    None of the above
 Discuss Question
Answer: Option A. -> Zero
Question 69. Burden of a protective relay is the power
  1.    required to operate the circuit breaker
  2.    absorbed by the circuit of relay
  3.    developed by the relay circuit
  4.    none of the above
 Discuss Question
Answer: Option B. -> absorbed by the circuit of relay
Question 70. A balanced 3-phase system consists of
  1.    zero sequence currents only
  2.    positive sequence currents only
  3.    negative and zero sequence currents
  4.    zero, negative and positive sequence currents
 Discuss Question
Answer: Option B. -> positive sequence currents only

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