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MCQs

Total Questions : 1232 | Page 2 of 124 pages
Question 11. If an insulating material is operated beyond the maximum allowable temperature, its life is
  1.    drastically increased
  2.    drastically reduced
  3.    unaffected
  4.    none of the above
 Discuss Question
Answer: Option B. -> drastically reduced
Question 12. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?
  1.    Copper
  2.    Aluminium
  3.    Steel
  4.    Cast-iron
 Discuss Question
Answer: Option D. -> Cast-iron
Question 13. Standard resistor is made from
  1.    platinum
  2.    maganin
  3.    silver
  4.    nichrome
 Discuss Question
Answer: Option B. -> maganin
Question 14. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to
  1.    improve its ventilation
  2.    eliminate creeping at no load
  3.    increase its deflecting torque
  4.    increase its braking torque
 Discuss Question
Answer: Option B. -> eliminate creeping at no load
Question 15. A dynamometer wattmeter can be used for
  1.    both D.C. and A.C.
  2.    D.C. only
  3.    A.C. only
  4.    any of the above
 Discuss Question
Answer: Option A. -> both D.C. and A.C.
Question 16. An induction wattmeter can be used for
  1.    both D.C. and A.C.
  2.    D.C. only
  3.    A.C. only
  4.    any of the above
 Discuss Question
Answer: Option C. -> A.C. only
Question 17. A potentiometer may be used for
  1.    measurement of resistance
  2.    measurement of current
  3.    calibration of ammeter
  4.    calibration of voltmeter
  5.    all of the above
 Discuss Question
Answer: Option E. -> all of the above
Question 18. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
  1.    short pitch
  2.    full pitch
  3.    either of the above
  4.    none of the above
 Discuss Question
Answer: Option B. -> full pitch
Question 19. Basically a potentiometer is a device for
  1.    comparing two voltages
  2.    measuring a current
  3.    comparing two currents
  4.    measuring a voltage
  5.    none of the above
 Discuss Question
Answer: Option A. -> comparing two voltages
Question 20. Which of the following methods may be adopted to reduce the effects of armature reaction?
  1.    Increase in length of air gap at pole tips
  2.    Increasing reluctance of pole tips
  3.    Compensating windings
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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