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

Question: The armature current of the synchronous motor:

• 1. has large values for low excitation i niy
• 2. has large values for high excitation only
• 3. has large values for low and high excitation
• 4. any of the above

Question: Exciters of synchronous machines are______________?

• 1. d.c. series machines
• 2. d.c. shunt machines
• 3. d.c. compound machines
• 4. any of the above

Question: The duration of sudden snort-circuit test on a synchronous motor is usually about_____________?

• 1. one hour
• 2. one minute
• 3. one second
• 4. none of the above

Question: The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?

• 1. slip torque
• 2. pull-out torque
• 3. breaking torque
• 4. synchronising torque

Question: Which of the following motors is non-self starting ?

• 1. DC series motor
• 2. synchronous motor
• 3. Squirrel cage induction motor
• 4. Wound round induction motor