Question 456Electricity/Electronics - Assistant Engineer70% to pass
What statement is true concerning speed control of a shunt wound DC motor?
AI Explanation
The correct answer is C.
For a shunt wound DC motor, the speed control can be achieved through either armature rheostat control or field rheostat control. In armature rheostat control, increasing the resistance in the armature circuit decreases the motor speed. In field rheostat control, increasing the resistance in the field circuit decreases the field strength, which in turn increases the motor speed. Therefore, the statement in option C accurately describes the relationship between resistance and speed for both armature and field rheostat control.
The other options are incorrect because they either reverse the relationship between resistance and speed, or they mix up the effects of armature and field rheostat control.
Related Questions
#454 Referring to figure "B" of the illustration, what statement is true? Illustration EL-0020 #455 In a series circuit, which value will remain unchanged at all places in the circuit? #457 What type of DC motor has relatively low starting torque, but has excellent inherent speed regulation? #458 In a shunt wound DC motor, how is the shunt field connected? #459 What are the characteristics of the field winding of a shunt wound motor?