Computer Programming MCQs

5739 MCQs  (Page 63 of 574)

The ‘cogging’ of an induction motor can be avoided by____________?
A. Proper ventilation
B. Using dol starter
C. Auto-transformer starter
D. Having number of rotor slots more or less than the number of stator slots (not equal)
Slip of an induction motor is negative when_____________?
A. Magnetic field and rotor rotate in opposite direction
B. Rotor speed is less than the synchronous speed of the field and are in the same direction
C. Rotor speed is more than the synchronous speed of the field and are in the same direction
D. None of the above
A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?
A. Will continue running burning its one phase
B. Will continue running burning its two phases
C. Will stop and carry heavy current causing permanent damage to its winding
D. Will continue running without any harm to the winding
A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?
A. Will continue running burning its one phase
B. Will continue running burning its two phase
C. Will stop and carry heavy current causing permanent damage to its winding
D. Will continue running without any harm to the winding
Low voltage at motor terminals is due to____________?
A. Inadequate motor wiring
B. Poorely regulated power supply
C. Any one of the above
D. None of the above
In an induction motor the relationship between stator slots and rotor slots is that_____________?
A. Stator slots are equal to rotor slots
B. Stator slots are exact multiple of rotor slots
C. Stator slots are not exact multiple of rotor slots
D. None of the above
Slip ring motor is recommended where____________?
A. Speed control is required
B. Frequent starting, stopping and reversing is required
C. High starting torque is needed
D. All above features are required