Motor realated Quiz Practice Quiz | Motor Related

Q: In a three-phase induction motor, if the supply frequency is increased, which of the following parameters primarily decreases?

Developed torque — Increasing frequency reduces the developed torque due to impedance and flux changes.

Q: What is the purpose of a commutator in a DC motor?

To reverse the current direction in the armature conductors. — The commutator reverses current in the armature coils at appropriate times to maintain continuous torque.

Q: Which type of motor is typically used in applications requiring high starting torque and relatively constant speed?

Series DC motor — Series DC motors have high starting torque. Shunt motors maintain more constant speed.

Q: What is 'slip' in an induction motor?

The difference between synchronous speed and rotor speed. — Slip is a measure of the speed difference between the rotating magnetic field and rotor's actual rotation.

Q: How can the speed of a DC shunt motor be controlled effectively?

By varying the applied voltage to the armature. — Controlling the armature voltage directly affects the back EMF and consequently, the motor's speed.

Question 1 of 5

In a three-phase induction motor, if the supply frequency is increased, which of the following parameters primarily decreases?

Increasing frequency reduces the developed torque due to impedance and flux changes.

Question 2 of 5

What is the purpose of a commutator in a DC motor?

The commutator reverses current in the armature coils at appropriate times to maintain continuous torque.

Question 3 of 5

Which type of motor is typically used in applications requiring high starting torque and relatively constant speed?

Series DC motors have high starting torque. Shunt motors maintain more constant speed.

Question 4 of 5

What is 'slip' in an induction motor?

Slip is a measure of the speed difference between the rotating magnetic field and rotor's actual rotation.

Question 5 of 5

How can the speed of a DC shunt motor be controlled effectively?

Controlling the armature voltage directly affects the back EMF and consequently, the motor's speed.

Motor realated Quiz