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More Questions on This Topic :

Question 1. Lubricant used for ball bearing is usually
  1.    Graphite
  2.    Grease
  3.    Mineral oil
  4.    Molasses
Answer: Option B

Question 2. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
  1.    In the opposite direction as the direction of the rotating field
  2.    In the same direction as the direction of the field
  3.    In any direction depending upon phase sequence of supply
  4.    None of these
Answer: Option B

Question 3. For which motor the speed can be controlled from rotor side?
  1.    Squirrel-cage induction motor
  2.    Slip-ring induction motor
  3.    Both (A) and (B)
  4.    None of the above
Answer: Option B

Question 4. A squirrel cage induction motor is not selected when
  1.    Initial cost is the main consideration
  2.    Maintenance cost is to be kept low
  3.    Higher starting torque is the main consideration
  4.    All above considerations are involved
Answer: Option C

Question 5. The number of slip rings on a squirrel cage induction motor is usually
  1.    Two
  2.    Three
  3.    Four
  4.    None
Answer: Option D

Question 6. The shaft of an induction motor is made of
  1.    High speed steel
  2.    Stainless steel
  3.    Carbon steel
  4.    Cast iron
Answer: Option C