
Load characteristics of DC motors, losses and efficiency in DC m
Quiz
•
Physics
•
1st Grade
•
Hard

monika t
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the two main components of the armature and field circuit in a DC motor?
Armature and Field Circuit
Shaft and Gear
Rotor and Stator
Battery and Switch
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the function of brushes in a DC motor.
To cool down the motor
To transfer electrical power to the rotating armature
To provide support for the motor casing
To generate electricity for the motor
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the differences between brush and brushless DC motors?
Type of the motor
Size of the motor
Color of the motor
Presence of brushes
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does copper loss occur in a DC motor?
Because of the high efficiency of the copper windings in the armature and field coils.
Due to the resistance of the copper windings in the armature and field coils.
Due to the presence of aluminum windings in the armature and field coils.
As a result of the low resistance of the copper windings in the armature and field coils.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of iron losses in a DC motor?
Decrease in motor efficiency
Significant impact on motor efficiency and heating
Increase in motor speed
No impact on motor performance
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is efficiency calculated in a DC machine?
Output power divided by input power
Voltage multiplied by current
Efficiency is not calculated in a DC machine
Input power divided by output power
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the speed-torque characteristics of a DC motor.
The speed-torque characteristics of a DC motor show the relationship between the motor's weight and the torque it produces.
The speed-torque characteristics of a DC motor show the relationship between the motor's size and the torque it produces.
The speed-torque characteristics of a DC motor show the relationship between the motor's speed and the torque it produces.
The speed-torque characteristics of a DC motor show the relationship between the motor's color and the torque it produces.
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What factors affect the speed-torque characteristics of a DC motor?
Temperature of the surrounding environment
Color of the motor casing
Supply voltage, armature resistance, and magnetic field strength
Number of screws in the motor
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