a) False. The speed of a DC motor is proportional to the applied voltage, not the main magnetic flux.
b) True. Series motors have variable speeds.
c) True. The torque produced by a series motor is proportional to the square of the armature current.
d) False. Shunt motors are typically not high-torque motors, they are better suited for applications where a constant speed is required.
e) True. The speed of a motor will decrease with a decrease in the main magnetic flux, as the back EMF generated is reduced.
True or false, explain if false
a) The speed of DC motor is proportional to the main magnetic flux.
b) Series motors are variable-speed motors.
c) The torque produced by a series motor is proportional to the square of armature current.
d) Shunt motors are high-torque motors.
e)The speed of a motor will decrease with a decrease in the main magnetic flux.
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