A. rotor conductor ends are short-circuited through slip rings
B. rotor conductors are short-circuited through end rings
C. rotor conductors are kept open
D. rotor conductors are connected to insulation
Related Mcqs:
- The starting torque of a 3-phase squirrel cage induction motor is____________?
A. twice the full load torque
B. 1.5 times the full load torque
C. equal to full load torque - The number of slip rings on a squirrel cage induction motor is usually____________?
A. two
B. three
C. four
D. none - In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?
A. reduce windage losses
B. reduce eddy currents
C. reduce accumulation of dirt and dust
D. reduce magnetic hum - The starting torque of a squirrel-cage induction motor is___________?
A. low
B. negligible
C. same as full-load torque
D. slightly more than full-load torque - A double squirrel-cage induction motor has______________?
A. two rotors moving in oppsite direction
B. two parallel windings in stator
C. two parallel windings in rotor
D. two series windings in stator - Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
A. By changing the number of stator poles
B. Rotor rheostat control
C. By operating two motors in cascade
D. By injecting e.m.f. in the rotor circuit - When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?
A. in series
B. in parallel
C. in series-parallel
D. in parallel with stator - The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?
A. changing supply frequency
B. changing number of poles
C. changing winding resistance
D. reducing supply voltage - A squirrel cage induction motor is not selected when___________?
A. initial cost is the main consideration
B. maintenance cost is to be kept low
C. higher starting torque is the main consideration
D. all above considerations are involved - Slip ring motor is preferred over squirrel cage induction motor where___________?
A. high starting torque is required
B. load torque is heavy
C. heavy pull out torque is required
D. all of the above
