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MCQs

Total Questions : 1232 | Page 3 of 124 pages
Question 21. The heated parts of an electrical machine dissipate heat into their surroundings by which of the followingmodes of heat dissipation ?
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 22. The action of electromagnetic machines can be related to which of the following basic principles ?
  1.    Induction
  2.    Interaction
  3.    Alignment
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 23. Which of the following properties a damping oil must possess ?
  1.    Must be a good insulator
  2.    Should be non-evaporating
  3.    Should not have corrosive action upon the metal of the vane
  4.    The viscosity of the oil should not change with the temperature
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 24. In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
  1.    5 percent
  2.    10 percent
  3.    15 percent
  4.    30 percent
  5.    none of the above
 Discuss Question
Answer: Option C. -> 15 percent
Question 25. An induction meter can handle current up to
  1.    10 A
  2.    30 A
  3.    60 A
  4.    100 A
 Discuss Question
Answer: Option D. -> 100 A
Question 26. _______ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
  1.    Grey cast-iron
  2.    Cast steel
  3.    High carbon steel
  4.    Stainless steel
 Discuss Question
Answer: Option B. -> Cast steel
Question 27. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
  1.    0.1 Hz
  2.    0.25 Hz
  3.    0.5 Hz
  4.    1.5 Hz
 Discuss Question
Answer: Option C. -> 0.5 Hz
Question 28. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
  1.    10 MW
  2.    30 MW
  3.    60 MW
  4.    150 MW
 Discuss Question
Answer: Option C. -> 60 MW
Question 29. The household energy meter is
  1.    an indicating instrument
  2.    a recording instrument
  3.    an integrating instrument
  4.    none of the above
 Discuss Question
Answer: Option C. -> an integrating instrument
Question 30. The flash point of transformer oil should be higher than
  1.    40°C
  2.    60°C
  3.    80°C
  4.    104°C
 Discuss Question
Answer: Option D. -> 104°C

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