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MCQs

Total Questions : 206 | Page 20 of 21 pages
Question 191. A _______ is used to measure the stator % winding temperature of the generator.
  1.    thermocouple
  2.    pyrometer
  3.    resistance thermometer
  4.    thermometer
 Discuss Question
Answer: Option C. -> resistance thermometer
Question 192. To protect most of the electrical equipment handling low power, the types of relays used are
  1.    Both of the listed here
  2.    Thermocouple
  3.    None of these
  4.    Electronic and bimetallic
 Discuss Question
Answer: Option A. -> Both of the listed here
Question 193. A fuse in a motor circuit provides protection against
  1.    overload
  2.    short-circuit and overload
  3.    None of these
  4.    open circuit, short-circuit and overload
 Discuss Question
Answer: Option B. -> short-circuit and overload
Question 194. Overheating of relay contacts or contact born out is due to
  1.    foreign matter on the contact surface
  2.    slow making and breaking of load circuit contacts
  3.    too low contact pressure
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 195. Wave trap is used to trap waves of
  1.    power frequencies
  2.    higher frequencies entering generator or transformer units
  3.    None of these
  4.    either of the above
 Discuss Question
Answer: Option B. -> higher frequencies entering generator or transformer units
Question 196. SF6 gas
  1.    is yellow in colour
  2.    has pungent small
  3.    is nontoxic
  4.    is lighter than air
  5.    None of these
 Discuss Question
Answer: Option C. -> is nontoxic
Question 197. The main function of a fuse is to
  1.    prevent excessive currents
  2.    open the circuit
  3.    protect the line
  4.    None of these
  5.    protect the appliance
 Discuss Question
Answer: Option A. -> prevent excessive currents
Question 198. A.C. network analyzer is used to solve problems of
  1.    Load flow
  2.    Load flow and stability
  3.    Load flow and short-circuit
  4.    Load flow, short-circuit and stability
 Discuss Question
Answer: Option D. -> Load flow, short-circuit and stability
Question 199. The information to the circuit breaker under fault conditions is provided by
  1.    H.R.'only
  2.    All of these
  3.    relay
  4.    rewirable fuse
 Discuss Question
Answer: Option C. -> relay
Question 200. For the protection of power station buildings against direct strokes the requirements are
  1.    None of these
  2.    interception, conduction, dissipation and reflection
  3.    interception
  4.    interception, conduction and dissipation
  5.    interception and conduction
 Discuss Question
Answer: Option D. -> interception, conduction and dissipation

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