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WorksheetsExplore 3 Phase Induction Motors
Total questions: 10
Worksheet time: 10mins
What is the main function of a 3 phase induction motor?
To convert electrical energy into mechanical energy.
To generate electrical energy from mechanical energy.
To store electrical energy for later use.
To regulate voltage in electrical circuits.
How does a 3 phase induction motor start?
By using a single-phase AC supply to start the motor.
By applying a DC supply to the motor windings.
By manually rotating the rotor to initiate movement.
A 3 phase induction motor starts by applying a 3-phase AC supply, creating a rotating magnetic field that induces current in the rotor.
What happens to the speed of the motor as torque increases?
The speed of the motor fluctuates randomly with torque changes.
The speed of the motor increases as torque increases.
The speed of the motor remains constant regardless of torque.
The speed of the motor decreases as torque increases.
What is the typical application of a 3 phase induction motor?
Electric vehicles and hybrid cars.
Industrial machinery such as pumps, fans, and conveyors.
Small electronic devices such as smartphones and tablets.
Household appliances like toasters and microwaves.
What is the efficiency of a 3 phase induction motor?
100%
70% to 80%
85% to 95%
50% to 60%
What are the common losses in a 3 phase induction motor?
Stator copper losses, rotor copper losses, iron losses, stray load losses.
Bearing losses
Mechanical friction losses
Cooling system losses
What winding configuration is used in a 3 phase induction motor?
Star (Y) or Delta (Δ) configuration
Series winding configuration
Parallel winding configuration
Single-phase configuration
What is the role of the rotor in a 3 phase induction motor?
The rotor generates the electrical energy for the motor.
The rotor is responsible for cooling the motor components.
The rotor converts electrical energy into mechanical energy by rotating in response to the stator's magnetic field.
The rotor acts as a power supply for the stator.
How does the number of phases affect motor performance?
More phases decrease motor performance.
The number of phases has no impact on motor performance.
More phases generally improve motor performance.
Fewer phases always lead to better motor performance.
Why are 3 phase induction motors preferred in industrial applications?
They are less efficient under heavy loads compared to synchronous motors.
They require more complex control systems than other types of motors.
They are cheaper to manufacture than single-phase motors.
Three-phase induction motors are preferred for their efficiency, torque, load handling, and lower maintenance.
