Question: Which of the following motor will have relatively higher power factor ?

• 1. Capacitor run motor
• 2. Shaded pole motor
• 3. Capacitor start motor
• 4. Split phase motor

Question: In a shaded pole motor, the shading coil usually consist of___________?

• 1. a single turn of heavy wire which is in parallel with running winding
• 2. a single turn of heavy copper wire which is short-circuited and carries only induced current
• 3. a multilayer fine gauge copper wire in parallel with running winding
• 4. none of the above

Question: The rotor developed by a single-phase motor at starting is___________?

• 1. more than i.he rated torque
• 2. rated torque
• 3. less than the rated torque
• 4. zero

Question: In a split phase motor____________?

• 1. the starting winding is connected through a centrifugal switch
• 2. the running winding is connected through a centrifugal switch
• 3. both starting and running windings are connected through a centrifugal switch
• 4. centrifugal switch is used to control supply voltage

Question: If the capacitor of a single-phase motor is short-circuited_________?

• 1. the motor will not start
• 2. the motor will run
• 3. the motor will run in reverse direction
• 4. the motor will run in the same direction at reduced r.p.m

Question: In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?

• 1. improve power factor
• 2. increase overload capacity
• 3. reduce fluctuations in torque
• 4. to improve torque

Question: In a split phase motor, the running winding should have?

• 1. high resistance and low inductance
• 2. low resistance and high inductance
• 3. high resistance as well as high inductance
• 4. low resistance as well as low inductiance

Question: In capacitor start single-phase motors____________?

• 1. current in the starting winding leads the voltage
• 2. current in the starting winding lags the voltage
• 3. current in the starting winding is in phase with voltage in running winding
• 4. none of the above

Question: In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?

• 1. 10°
• 2. 30°
• 3. 60°
• 4. 90°

Question: 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