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MCQs

Total Questions : 71 | Page 4 of 8 pages
Question 31. A three-phase ∆-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I θa = 12 ∠30° A, what are the polar expressions for the other phase currents?
  1.    I θb = 12 ∠150° A, I θc = 12 ∠-90° A
  2.    I θb = 12 ∠120° A, I θc = 12 ∠30° A
  3.    I θb = 12 ∠30° A, I θc = 12 ∠120° A
  4.    I θb = 12∠ 90° A, I θc = 12 ∠90° A
 Discuss Question
Answer: Option A. -> I θb = 12 ∠150° A, I θc = 12 ∠-90° A
Question 32. In the transformer the function of a conservator is to
  1.    Provide fresh air for cooling the transformer
  2.    Supply cooling oil to transformer in time of need
  3.    Protect the transformer from damage when oil expends due to heating
  4.    None of the above
 Discuss Question
Answer: Option C. -> Protect the transformer from damage when oil expends due to heating
Question 33. Wind energy is harnessed as ______ energy with the help of windmill or turbine
  1.    Mechanical
  2.    Solar
  3.    Electrical
  4.    Heat
 Discuss Question
Answer: Option A. -> Mechanical
Question 34. Which one of the following statements is NOT true?
  1.    When the equipment is designed at low power factor it is to be designed for more kVA
  2.    When power factor is decreased, loss in the cable supplying load is decreased.
  3.    Due to reduced power factor voltage regulation of line becomes poor 
  4.    Reduced power factor reduces the efficiency of the plant 
 Discuss Question
Answer: Option B. -> When power factor is decreased, loss in the cable supplying load is decreased.
Question 35. What are the common assumptions made for the equal area criterion?
  1.    The transmission line and machine resistances are neglected
  2.    Rotor speed of the machine is constant
  3.    Mechanical input remains constant.
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 36. In which part of the power system has lowest voltage?
  1.    Generation
  2.    Distribution
  3.    Transmission
  4.    Grid
 Discuss Question
Answer: Option B. -> Distribution
Question 37. The short circuit current of an alternator when short circuited on three phases will be
  1.    Zero as time goes to infinity
  2.    Maximum when time goes to infinity
  3.    Infinity when time goes to infinity
  4.    Small as time goes to infinity but not zero
 Discuss Question
Answer: Option A. -> Zero as time goes to infinity
Question 38. What is the main source for the formation of wind?
  1.    Uneven land
  2.    Sun
  3.    Vegetation
  4.    Seasons
 Discuss Question
Answer: Option B. -> Sun
Question 39. Use of high speed circuit breaker will actually increase the system stability
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 40. Skin effect is proportional to
  1.    diameter of conductor
  2.    (diameter of conductor)1/2
  3.    (diameter of conductor )2
  4.    none
 Discuss Question
Answer: Option C. -> (diameter of conductor )2

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