Explanation: Large size motors use open slots, so that already prepared and properly insulated coils can be inserted in open slots. Small size induction motors use semiclosed slots, so as to reduce the effective gap length between stator and rotor. 2. In which of the following applications, wound rotor type of induction motor is used?
A. where the driven load requires speed control
B. where high starting torque is required
C. when external resistance is to be inserted
D. any of the mentioned
Answer:A
Explanation: Large size motors use open slots, so that already prepared and properly insulated coils can be inserted in open slots. Small size induction motors use semiclosed slots, so as to reduce the effective gap length between stator and rotor. 2. In which of the following applications, wound rotor type of induction motor is used?
A. where the driven load requires speed control B. where high starting torque is required C. when external resistance is to be inserted D. any of the mentioned
Explanation: Only in wound rotor type of induction motor, external resistance can be inserted in series with the rotor winding, for speed and starting torque control. 3. For an induction motor,