Ques 45. The best method to increase the
starting torque of a 3-phase slip ring
induction motor is
1. Rotor Resistance
2. Supply voltage
3. Supply Frequency
4. None of the above
Answers
Answer:
The stating torque of the slip ring induction motor can be increased by adding
A. External inductance to the rotor.
External resistance to the rotor.
External capacitance to the rotor.
Both resistance and inductance to rotor.
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The stating torque
The best method to increase the starting torque of a 3-phase slip ring
induction motor is 1. Rotor Resistance.
Rotor Resistance:
A star-connected variable resistance is connected to the rotor circuit via slip-rings in a rotor resistance starter. The rotor resistance starter can produce a lot of starting torque.
Explanation for incorrect answer:
2. Supply voltage:
The voltage that is commonly available for all appliances, instruments, and machines is referred to as supply voltage. So it cannot be used to increase the starting torque of a 3-phase slip ring induction motor.
3. Supply Frequency:
The frequency of the AC power supply system is 50 Hz or 60 Hz, depending on the application. o it cannot be used to increase the starting torque of a 3-phase slip ring induction motor.
4. None of the above:
Rotor resistance is used to increase the starting torque of a 3-phase slip ring induction motor. So none of the above is the wrong answer.
As a result, the best way to increase the starting torque of a 3-phase slip ring induction motor is to use Rotor Resistance.