Question 2Electricity/Electronics - Assistant Engineer70% to pass
What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?
AI Explanation
The correct answer is D) relatively high starting torque and low stator current.
When a wound-rotor induction motor has a high resistance inserted in series with the rotor winding at startup, it results in a high starting torque and low stator current. The high resistance in the rotor circuit limits the rotor current, which in turn increases the torque developed by the motor. This high resistance also reduces the stator current drawn by the motor during the starting process, as the rotor impedance is effectively increased.
The other options are incorrect because they do not accurately describe the characteristics of a wound-rotor induction motor with a high resistance in the rotor circuit at startup. A low starting torque and low stator current (option A) or a low starting torque and high stator current (option B) would not be the correct behavior. A high starting torque and high stator current (option C) is also incorrect, as the high resistance in the rotor circuit limits the stator current.
Related Questions
#1 A degree of control over the speed of a slip ring induction motor can be obtained by what means? #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? #5 Which of the following physical characteristics does a three-phase wound-rotor induction motor possess that a squirrel-cage induction motor does not?