What is a rotating magnetic field?

Understanding Three-Phase Motors

Quiz
•
Engineering
•
1st Grade
•
Medium
RanjanKumar Naik
Used 1+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
A static magnetic field that does not change over time.
A magnetic field created by permanent magnets only.
A magnetic field that only exists in a vacuum.
A rotating magnetic field is a magnetic field that changes direction and magnitude over time, typically produced by alternating currents in coils.
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How many phases does a three-phase motor have?
5
3
4
2
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What creates the rotating magnetic field in a motor?
The flow of direct current in the rotor.
The mechanical rotation of the rotor itself.
The presence of permanent magnets in the stator.
The interaction of alternating current in the stator windings.
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is torque in a three-phase motor?
Torque is the amount of current flowing through the motor.
Torque is the voltage supplied to the motor.
Torque is the rotational force produced by the electromagnetic interaction in a three-phase motor.
Torque is the speed of the motor's rotation.
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How is torque measured in motors?
Torque is measured in Newton-meters (Nm) or pound-feet (lb-ft).
Torque is measured in joules (J)
Torque is measured in kilograms (kg)
Torque is measured in watts (W)
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What happens to torque when the load increases?
Torque decreases with an increase in load.
Torque remains constant regardless of load changes.
Torque is unaffected by the load applied.
Torque increases with an increase in load.
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
What is slip in an induction motor?
Slip is the difference between synchronous speed and rotor speed, expressed as a percentage.
Slip is the speed at which the motor operates under full load.
Slip is the torque produced by the motor at synchronous speed.
Slip is the maximum speed of the rotor in an induction motor.
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