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MCQs

Total Questions : 206 | Page 18 of 21 pages
Question 171. If the fault occurs near the impedance relay, the V/ I ratio will be
  1.    higher than that of if fault occurs away from the relay
  2.    constant for all distances
  3.    Lower than that of if fault occurs away from the relay
  4.    None of these
 Discuss Question
Answer: Option C. -> Lower than that of if fault occurs away from the relay
Question 172. Series capacitors are used to
  1.    improve line voltage
  2.    None of these
  3.    compensate for line inductive reactance
  4.    compensate for line capacitive reactance
 Discuss Question
Answer: Option C. -> compensate for line inductive reactance
Question 173. Air blast circuit breakers for 400 kV power system are designed to operate in
  1.    100 micro-second
  2.    50 milli-second
  3.    0.1 sec
  4.    0.5 sec
 Discuss Question
Answer: Option B. -> 50 milli-second
Question 174. The single phasing relays are used for the protection of
  1.    three phase motors
  2.    two single phase motors running in parallel
  3.    single phase motors only
  4.    two phase motors only
 Discuss Question
Answer: Option A. -> three phase motors
Question 175. A fuse is never inserted in
  1.    phase line
  2.    positive of dc circuit
  3.    neutral wire
  4.    negative of dc circuit
 Discuss Question
Answer: Option C. -> neutral wire
Question 176. Protection of fuses is generally not used beyond
  1.    50 A
  2.    100 A
  3.    200 A
  4.    20 A
 Discuss Question
Answer: Option B. -> 100 A
Question 177. The short circuit in any winding of the transformer is the result of
  1.    mechanical vibration
  2.    impulse voltage
  3.    insulation failure
  4.    loose connection
 Discuss Question
Answer: Option B. -> impulse voltage
Question 178. The reflection co-efficient at the open circuited end of a transmission line
  1.    infinity
  2.    None of these
  3.    unity
  4.    zero
 Discuss Question
Answer: Option C. -> unity
Question 179. To reduce short circuit fault currents......... are used.
  1.    reactors
  2.    resistors
  3.    capacitors
  4.    None of these
 Discuss Question
Answer: Option A. -> reactors
Question 180. Series reactors should have
  1.    low impedance
  2.    low resistance
  3.    high resistance
  4.    high impedance
 Discuss Question
Answer: Option B. -> low resistance

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