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WorksheetsDC Motor Quiz
Total questions: 10
Worksheet time: 5mins
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
