dc motor Quiz Practice Quiz | DC motor

Q: What is the primary function of a DC motor?

To convert electrical energy into mechanical energy. — DC motors are designed to use electrical energy to produce rotational motion.

Q: What is the component of a DC motor that reverses the current direction in the armature winding?

Commutator — The commutator is a crucial part, ensuring continuous torque.

Q: What type of motor has the armature and field windings connected in parallel?

Shunt motor — Shunt motors offer relatively constant speed characteristics.

Q: In a DC motor, what is the role of the brushes?

To connect the armature winding to the external circuit. — Brushes maintain the electrical connection to the rotating armature.

Q: What is back EMF in a DC motor?

The voltage generated in the armature due to its rotation. — Back EMF opposes the applied voltage, regulating motor speed.

Q: Which of the following motors has the highest starting torque?

Series motor — Series motors draw large current at startup providing high torque.

Q: What is the speed of a DC motor proportional to?

Both b and c — Motor speed is affected by both voltage and field strength.

Q: What happens to the speed of a DC shunt motor if the field flux is increased?

Speed decreases — Increasing flux reduces the speed.

Q: Which motor is NOT a type of DC motor?

Synchronous motor — Synchronous motors are AC motors.

Q: What is the function of the armature winding in a DC motor?

To carry the current and experience torque. — Armature windings interact with the magnetic field for torque generation.

Question 1 of 15

What is the primary function of a DC motor?

DC motors are designed to use electrical energy to produce rotational motion.

Question 2 of 15

What is the component of a DC motor that reverses the current direction in the armature winding?

The commutator is a crucial part, ensuring continuous torque.

Question 3 of 15

What type of motor has the armature and field windings connected in parallel?

Shunt motors offer relatively constant speed characteristics.

Question 4 of 15

In a DC motor, what is the role of the brushes?

Brushes maintain the electrical connection to the rotating armature.

Question 5 of 15

What is back EMF in a DC motor?

Back EMF opposes the applied voltage, regulating motor speed.

Question 6 of 15

Which of the following motors has the highest starting torque?

Series motors draw large current at startup providing high torque.

Question 7 of 15

What is the speed of a DC motor proportional to?

Motor speed is affected by both voltage and field strength.

Question 8 of 15

What happens to the speed of a DC shunt motor if the field flux is increased?

Increasing flux reduces the speed.

Question 9 of 15

Which motor is NOT a type of DC motor?

Synchronous motors are AC motors.

Question 10 of 15

What is the function of the armature winding in a DC motor?

Armature windings interact with the magnetic field for torque generation.

Question 11 of 15

What causes the armature to rotate in a DC motor?

Torque is generated due to the interaction of current and magnetic field.

Question 12 of 15

What is the primary factor that determines the direction of rotation of a DC motor?

Reversing current or flux direction reverses rotation.

Question 13 of 15

In a DC motor, what is the purpose of the field winding?

Field windings create the magnetic field that interacts with the armature.

Question 14 of 15

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

Speed is inversely proportional to field flux.

Question 15 of 15

What is the common unit for measuring the speed of a DC motor?

RPM is the most widely used unit for speed.

dc motor Quiz