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MCQs

Total Questions : 233 | Page 4 of 24 pages
Question 31. The starting winding of a single-phase motor is placed in
  1.    Armature
  2.    Field
  3.    Rotor
  4.    Stator
 Discuss Question
Answer: Option D. -> Stator
Question 32. In case of high speed universal motor which of the following needs more attention ?
  1.    End play
  2.    Air gap
  3.    Insulation in rotor
  4.    Balancing of rotor
 Discuss Question
Answer: Option D. -> Balancing of rotor
Question 33. Which of the following motors can be run on AC. as well as D.C. supply ?
  1.    Universal motor
  2.    Repulsion motor
  3.    Synchronous motor
  4.    Reluctance motor
 Discuss Question
Answer: Option A. -> Universal motor
Question 34. The purpose of stator winding in the compensated repulsion motor is to
  1.    provide mechanical balance
  2.    improve power factor and provide better speed regulation
  3.    prevent hunting in the motor
  4.    eliminate armature reaction
 Discuss Question
Answer: Option B. -> improve power factor and provide better speed regulation
Question 35. Which of the following applications always have some load whenever switched on ?
  1.    Vacuum cleaners
  2.    Fan motors
  3.    Pistol drills
  4.    All of the above
 Discuss Question
Answer: Option C. -> Pistol drills
Question 36. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
  1.    fans
  2.    blowers
  3.    sound equipment
  4.    mixer grinders
 Discuss Question
Answer: Option C. -> sound equipment
Question 37. The speed control of universal motor used for sewing machines is by
  1.    friction
  2.    varying the resistance
  3.    tapping the field
  4.    centrifugal mechanism
 Discuss Question
Answer: Option B. -> varying the resistance
Question 38. The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be
  1.    At the end connections
  2.    At the end terminals
  3.    Anywhere on the winding inside a slot
  4.    At the slot edge where coil enters or comes out of the slot
 Discuss Question
Answer: Option D. -> At the slot edge where coil enters or comes out of the slot
Question 39. The range of efficiency for shaded pole motors is
  1.    95% to 99%
  2.    80% to 90%
  3.    50% to 75%
  4.    5% to 35%
 Discuss Question
Answer: Option D. -> 5% to 35%
Question 40. Which of the following motor will give relatively high starting torque ?
  1.    Capacitor start motor
  2.    Capacitor run motor
  3.    Split phase motor
  4.    Shaded pole motor
 Discuss Question
Answer: Option A. -> Capacitor start motor

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