Question 1Electricity/Electronics - Assistant Engineer70% to pass
A degree of control over the speed of a slip ring induction motor can be obtained by what means?
AI Explanation
The correct answer is C) inserting resistance into the rotor circuit.
The speed of a slip ring induction motor can be controlled by inserting resistance into the rotor circuit. This changes the slip, which is the difference between the synchronous speed and the actual speed of the motor. Increasing the rotor resistance reduces the speed of the motor, while decreasing the resistance increases the speed.
The other options are incorrect because: A) inserting resistance into the stator circuit does not control the motor speed, B) adjusting the governor linkage is for controlling the speed of a governor, not a slip ring induction motor, and D) changing the number of phases does not provide a means of speed control for this type of motor.
Related Questions
#2 What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup? #3 As shown in the illustrated wound-rotor induction motor, what statement is true concerning motor lead connections? Illustration EL-0148 #4 What type of AC motor would use a rheostat in the rotor circuit to vary the speed of the motor?