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MCQs

Total Questions : 473 | Page 4 of 48 pages
Question 31. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
  1.    Will continue running burning its one phase
  2.    Will continue running burning its two phases
  3.    Will stop and carry heavy current causing permanent damage to its winding
  4.    Will continue running without any harm to the winding
 Discuss Question
Answer: Option A. -> Will continue running burning its one phase
Question 32. Blocked rotor test on induction motors is used to find out
  1.    Leakage reactance
  2.    Power factor on short circuit
  3.    Short-circuit current under rated voltage
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 33. A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor
  1.    Will continue running burning its one phase
  2.    Will continue running burning its two phase
  3.    Will stop and carry heavy current causing permanent damage to its winding
  4.    Will continue running without any harm to the winding
 Discuss Question
Answer: Option C. -> Will stop and carry heavy current causing permanent damage to its winding
Question 34. Star-delta starting of motors is not possible in case of
  1.    Single phase motors
  2.    Variable speed motors
  3.    Low horse power motors
  4.    High speed motors
 Discuss Question
Answer: Option A. -> Single phase motors
Question 35. In an induction motor the relationship between stator slots and rotor slots is that
  1.    Stator slots are equal to rotor slots
  2.    Stator slots are exact multiple of rotor slots
  3.    Stator slots are not exact multiple of rotor slots
  4.    None of the above
 Discuss Question
Answer: Option C. -> Stator slots are not exact multiple of rotor slots
Question 36. A 3-phase slip ring motor has
  1.    Double cage rotor
  2.    Wound rotor
  3.    Short-circuited rotor
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Wound rotor
Question 37. Low voltage at motor terminals is due to
  1.    Inadequate motor wiring
  2.    Poorly regulated power supply
  3.    Any one of the above
  4.    None of the above
 Discuss Question
Answer: Option C. -> Any one of the above
Question 38. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6-poles. The slip of the machine will be
  1.    0.01
  2.    0.02
  3.    0.03
  4.    0.04
 Discuss Question
Answer: Option D. -> 0.04
Question 39. It is advisable to avoid line starting of induction motor and use starter because
  1.    It will run in reverse direction
  2.    It will pick up very high speed and may go out of step
  3.    Motor takes five to seven times its full load current
  4.    Starting torque is very high
 Discuss Question
Answer: Option C. -> Motor takes five to seven times its full load current
Question 40. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor?
  1.    By changing the number of stator poles
  2.    Rotor rheostat control
  3.    By operating two motors in cascade
  4.    By injecting e.m.f. in the rotor circuit
 Discuss Question
Answer: Option A. -> By changing the number of stator poles

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