Understanding DC Motors Quiz

Which of the following is NOT a type of DC motor?

• Shunt DC Motor

• Series DC Motor

• Compound DC Motor

• Synchronous DC Motor

What is the main function of a commutator in a DC motor?

• To increase the speed of the motor

• To reverse the direction of current in the armature winding

• To reduce friction

• To cool the motor

Which type of DC motor is best suited for applications requiring high starting torque?

• Shunt DC Motor

• Series DC Motor

• Compound DC Motor

• Permanent Magnet DC Motor

The working principle of a DC motor is based on which law?

• Faraday’s Law of Electromagnetic Induction

• Lenz’s Law

• Fleming’s Left Hand Rule

• Ohm’s Law

Which of the following is a common application of a shunt DC motor?

• Electric traction

• Lifts and hoists

• Lathe machines

• Cranes

What is the main reason for regularly lubricating the bearings of a DC motor?

• To increase the weight of the motor

• To reduce electrical resistance

• To minimise friction and wear

• To increase the voltage

Which part of a DC motor is responsible for producing the magnetic field?

• Armature

• Commutator

• Field winding

• Shaft

In a DC series motor, the field winding is connected in:

• Parallel with the armature

• Series with the armature

• Both series and parallel

• Not connected at all

Which of the following is NOT a maintenance task for DC motors?

• Checking brush wear

• Cleaning commutator

• Replacing field windings every month

• Lubricating bearings

What is the unit of torque produced by a DC motor in the SI system?

• Newton-metre

• Pound-foot

• Joule

• Watt