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MCQs

Total Questions : 206 | Page 8 of 21 pages
Question 71. The line insulation is the insulation level of the station equipment.
  1.    less than
  2.    same as
  3.    more than
  4.    proportional to
  5.    not directly related with
 Discuss Question
Answer: Option E. -> not directly related with
Question 72. The delay fuses are used for the protection of ________ .
  1.    motors
  2.    power outlet circuits
  3.    fluorescent lamps
  4.    light circuits
 Discuss Question
Answer: Option A. -> motors
Question 73. Ungrounded neutral transmission system is not recommended because of system
  1.    insulation being overstressed due to over voltages
  2.    insulation overstress may lead to failure and subsequent phase to phase faults
  3.    being inadequately protected against ground fault
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 74. Induction cup relay is operated due to changes in
  1.    current
  2.    voltage
  3.    impedance
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 75. Which of the following parameter can be neglected for a short line?
  1.    Inductance
  2.    Capacitance
  3.    Resistance
  4.    Reactance
 Discuss Question
Answer: Option B. -> Capacitance
Question 76. Shunt capacitance is neglected while considering
  1.    short transmission line
  2.    medium transmission line
  3.    long transmission line
  4.    medium and long transmission lines
 Discuss Question
Answer: Option A. -> short transmission line
Question 77. The under voltage relay can be used for
  1.    generators
  2.    busbars
  3.    transformers
  4.    motors
  5.    all of the above
 Discuss Question
Answer: Option E. -> all of the above
Question 78. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
  1.    Have low contact resistance
  2.    Be clean and smooth
  3.    Be of sufficient size and proper shape
  4.    Have all above properties
 Discuss Question
Answer: Option D. -> Have all above properties
Question 79. Ionization in circuit breaker is facilitated by
  1.    high temperature
  2.    increase of mean free path
  3.    increasing field strength
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 80. Arc in a circuit breaker is interrupted at
  1.    zero current
  2.    maximum current
  3.    minimum voltage
  4.    maximum voltage
 Discuss Question
Answer: Option A. -> zero current

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