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MCQs

Total Questions : 206 | Page 9 of 21 pages
Question 81. On which of the following effects of electric current a fuse operates?
  1.    Photoelectric effect
  2.    Electrostatic effect
  3.    Heating effect
  4.    Magnetic effect
 Discuss Question
Answer: Option C. -> Heating effect
Question 82. Fault diverters are basically
  1.    fuses
  2.    relays
  3.    fast switches
  4.    circuit breakers
 Discuss Question
Answer: Option C. -> fast switches
Question 83. Relays can be designed to respond to changes in
  1.    resistance, reactance or impedance
  2.    voltage and current
  3.    light intensity
  4.    temperature
  5.    all above
 Discuss Question
Answer: Option E. -> all above
Question 84. On which of the following routine tests are conducted ?
  1.    Oil circuit breakers
  2.    Air blast circuit breakers
  3.    Minimum oil circuit breakers
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 85. Relays are used for phase faults on long line.
  1.    Impedance
  2.    Reactance
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option A. -> Impedance
Question 86. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
  1.    Radiation
  2.    Convection
  3.    Conduction
  4.    All of the above
 Discuss Question
Answer: Option C. -> Conduction
Question 87. The relay operating speed depends upon
  1.    the spring tension
  2.    the rate of flux built up
  3.    armature core air gap
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 88. The fuse blows off by
  1.    burning
  2.    arcing
  3.    melting
  4.    none of the above
 Discuss Question
Answer: Option C. -> melting
Question 89. Oil switches are employed for
  1.    low currents circuits
  2.    low voltages circuits
  3.    high voltages and large currents circuits
  4.    all circuits
 Discuss Question
Answer: Option C. -> high voltages and large currents circuits
Question 90. If the fault occurs near the impedance relay, the VII ratio will be
  1.    constant for all distances
  2.    lower than that of if fault occurs away from the relay
  3.    higher than that of if fault occurs away from the relay
  4.    none of the above
 Discuss Question
Answer: Option B. -> lower than that of if fault occurs away from the relay

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