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MCQs

Total Questions : 1232 | Page 4 of 124 pages
Question 31. Dummy coil should not be used in
  1.    small machines
  2.    large machines
  3.    either (A) or (B)
  4.    none of the above
 Discuss Question
Answer: Option B. -> large machines
Question 32. Which of the following essential features is possessed by an indicating instrument ?
  1.    Deflecting device
  2.    Controlling device
  3.    Damping device
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 33. The surge phenomenon is particularly important in case of
  1.    low voltage transformers
  2.    medium voltage transformers
  3.    high voltage transformers
  4.    any of the above
 Discuss Question
Answer: Option C. -> high voltage transformers
Question 34. Impose limitation on design.
  1.    Saturation
  2.    Temperature rise
  3.    Efficiency
  4.    Power factor
  5.    All above
 Discuss Question
Answer: Option E. -> All above
Question 35. Multilayer helical windings are commonly used in the transformers as high voltage windings
  1.    upto 20 kV
  2.    upto 50 kV
  3.    upto 80 kV
  4.    for 110 kV and above
 Discuss Question
Answer: Option D. -> for 110 kV and above
Question 36. Cylindrical windings using circular conductors, employed in transformers, are
  1.    single layered
  2.    double layered
  3.    multi-layered
  4.    none of the above
 Discuss Question
Answer: Option C. -> multi-layered
Question 37. The pointer of an indicating instrument should be
  1.    very light
  2.    very heavy
  3.    either (A) or (B)
  4.    neither (A) nor (B)
 Discuss Question
Answer: Option A. -> very light
Question 38. The ratio of maximum displacement deviation to full scale deviation of the instrument is called
  1.    static sensitivity
  2.    dynamic deviation
  3.    linearity
  4.    precision or accuracy
 Discuss Question
Answer: Option C. -> linearity
Question 39. Electrical machines having a power output up to about 750 W may be called_______machines.
  1.    small size
  2.    medium size
  3.    large size
  4.    any of the above
 Discuss Question
Answer: Option A. -> small size
Question 40. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
  1.    conduction
  2.    convection
  3.    radiation
  4.    any of the above
 Discuss Question
Answer: Option C. -> radiation

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