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MCQs

Total Questions : 206 | Page 19 of 21 pages
Question 181. 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
Question 182. In a single bus-bar system there will be complete shut down when
  1.    fault occurs on the bus itself
  2.    fault occurs with respect to earthing
  3.    fault occurs on neutral line
  4.    two or more faults occur simultaneously
 Discuss Question
Answer: Option A. -> fault occurs on the bus itself
Question 183. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
  1.    insulate the contacts from switch body
  2.    lubricate the contacts
  3.    All of these
  4.    extinguish the arc
  5.    None of these
 Discuss Question
Answer: Option D. -> extinguish the arc
Question 184. To limit short-circuit current in a power system are used
  1.    H.R. fuses
  2.    reactors
  3.    isolators
  4.    earth wires
 Discuss Question
Answer: Option B. -> reactors
Question 185. The power loss is an important factor for the design of
  1.    generator
  2.    motor
  3.    transmission line
  4.    feeder
 Discuss Question
Answer: Option C. -> transmission line
Question 186. A differential relay measures the vector difference between
  1.    two voltages
  2.    two currents
  3.    None of these
  4.    two or more similar electrical quantities
 Discuss Question
Answer: Option D. -> two or more similar electrical quantities
Question 187. An efficient and a well designed protective relaying should have
  1.    high speed and selectivity
  2.    economy and simplicity
  3.    All of these
  4.    good selectivity and reliability
 Discuss Question
Answer: Option C. -> All of these
Question 188. For which of the following protection from negative sequence currents is provided ?
  1.    Motors
  2.    Generators
  3.    Transformers
  4.    Transmission line
 Discuss Question
Answer: Option B. -> Generators
Question 189. A switchgear is device used for
  1.    switching and controlling an electrical circuit
  2.    switching, controlling and protecting the electrical circuit and equipment
  3.    interrupting an electrical circuit
  4.    switching an electrical circuit 111
 Discuss Question
Answer: Option B. -> switching, controlling and protecting the electrical circuit and equipment
Question 190. Distance relays are generally
  1.    none of these
  2.    split-phase relays
  3.    impedance relays
  4.    reactance relays
 Discuss Question
Answer: Option A. -> none of these

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