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WorksheetsDay 13 DC Motor(Generation)
Total questions: 21
Worksheet time: 11mins
Which part of the DC motor converts electrical energy into mechanical energy?
Field assembly
Armature assembly
Brush assembly
Commutator
The rotating part of the motor containing copper windings and a commutator is called the:
End frame
Field assembly
Armature assembly
Starter generator
What is the purpose of the commutator in a DC motor?
Generate electricity
Reduce noise
Reverse current direction in the armature
Increase speed
A voltage that opposes the applied voltage and increases with motor speed is known as:
Torque
Electromagnetism
Counter Electromotive Force (EMF)
Resistance
Which type of brush is rectangular and suited for larger motors?
Tube type
Box type
Graphite type
Parallel type
Field coils in a DC motor are responsible for:
Generating current
Cooling the motor
Creating a magnetic field
Lubricating moving parts
The brush assembly is made of:
Aluminum fins
Steel wires
Graphite carbon blocks
Plastic brackets
Which term describes the force that causes rotation in a motor?
Resistance
Torque
Voltage
Laminated iron cores are used in motors to:
Increase friction
Prevent overheating and energy loss
Reduce speed
Support the brush assembly
Torque
Prevents current reversal
Causes the motor's coil to rotate
Maintains electrical insulation
Increases resistance in the field coil
12. Brush Assembly
Creates the stationary magnetic field
Transfers current to the rotating armature
Acts as the external frame
Supports the commutator shaft
Counter EMF
Helps reduce voltage to the armature
Is created by the commutator
Is a voltage that opposes the applied voltage
Heats the motor to operating temperature
Field Assembly
Reverses armature rotation
Converts mechanical energy into electrical energy
Creates the magnetic field for the motor
Transfers current to the shaft
Starter Generator
A cooling fan for turbine engines
A device that acts as both a starter and a generator
A type of fuel pump
A brushless motor controller
Commutator
Guides current away from the motor
Creates resistance
Switches current direction in the armature
Absorbs heat from the windings
Series Motor
Armature and field windings in parallel
Field winding only
Armature and field windings in series
Armature-only rotation
Shunt Motor
Good for high torque applications only
Connects field windings in parallel with the armature
Commonly used in generators
Contains no commutator
Compound Motor
Field winding only
Used for light-load applications
Combines series and shunt windings
Not suitable for speed regulation
Which type of loss occurs from friction in bearings and moving parts?
Copper loss
Mechanical loss
Iron loss
Counter EMF
What is the main reason motors use laminated iron cores?
What brush type is most suitable for compact, light-duty applications(smaller surface area)?
Box type
Tube type
Silver alloy
