3-PHASE INDUCTION MOTOR - 3
Mastering 3-Phase Induction Motors
Test your knowledge of 3-phase induction motors with our comprehensive quiz designed for engineers and students alike. Dive deep into the principles of induction motors, their operation, and characteristics.
Whether you're looking to refine your skills or gain a better understanding, this quiz covers key topics such as:
- Motor control techniques
- Power factor behavior
- Starting methods
- Impact of load changes
21. If any two phases for an induction motor are interchanged __________
The motor will run in reverse direction
The motor will run at reduced speed
The motor will not run
The motor will burn
22. In a three-phase induction motor, the number of poles in the rotor winding is always ___________
Zero
More than the number of poles in stator
Less than the number of poles in stator
Equal to the number of poles in stator
23. DOL starting of induction motor is usually restricted to ___________
Low horse power motors
Variable speed motors
High horse power motors
High speed motors
24. The speed of a squirrel-cage induction motor can be controlled by all of the following except ____________
Changing supply frequency
Changing number of poles
Changing winding resistance
Reducing supply voltage
25. The power factor of an induction motor under no-load conditions will be closer to __________
0.2 lagging
0.2 leading
0.5 leading
Unity
26. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor ____________
Will continue running burning its one phase
Will continue running burning its two phase
Will stop and carry heavy current causing permanent damage to its winding
Will continue running without any harm to the winding
27. Slip ring motor is recommended where?
Speed control is required
Frequent starting, stopping and reversing is required
High starting torque is needed
All above features are required
28. As load on an induction motor goes on increasing ____________
The power factor goes on decreasing
The power factor remains constant
The power factor goes on increasing even after full load
The power factor goes on increasing upto full load and then it falls again
29. The speed characteristics of an induction motor closely resemble the speed-load characteristics of which of the following machines ?
D.C series motor
D.C. Shunt motor
Universal motor
None of the above
30. Which type of bearing is provided to small induction motors to support the rotor shaft?
Ball bearings
Cast iron bearings
Bush bearings
None of the above
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