DC Motor Quiz

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

• Converts DC to AC

• Ensures current flows in one direction

• Increases motor speed

• Reduces motor torque

Which DC motor is best suited for high starting torque applications like cranes or electric trains?

• DC Shunt Motor

• DC Series Motor

• Compound Motor

• Universal Motor

What is a key disadvantage of a DC series motor?

• Low starting torque

• Poor speed control

• High maintenance costs

• Cannot operate with AC

What happens if a DC series motor is run without a load?

• It maintains a constant speed

• It operates efficiently

• It can "run away" and cause damage

• It shuts down automatically

Which type of DC motor maintains a constant speed regardless of load changes?

• DC Series Motor

• Universal Motor

• DC Shunt Motor

• Compound Motor

In a compound wound motor, what is the purpose of the series winding?

• To provide high starting torque

• To maintain constant speed

• To reduce current flow

• To increase efficiency

What is a key characteristic of a short compound motor?

• Both windings are connected in parallel

• Provides significant torque boost under heavy loads

• Difficult to control speed

• Operates only on AC

What distinguishes a universal motor from other DC motors?

• Operates on both AC and DC

• Has a higher efficiency

• Requires less maintenance

• Is larger in size

Which motor type is ideal for applications requiring stable speed with occasional load changes?

• DC Series Motor

• Compound Motor

• DC Shunt Motor

• Universal Motor

What is the primary drawback of a DC shunt motor?

• Low starting torque

• High maintenance cost

• Inconsistent speed under load

• Unsuitable for industrial applications