3-PHASE INDUCTION MOTOR - 2
3-Phase Induction Motor Quiz
Test your knowledge on 3-phase induction motors with this comprehensive quiz! Whether you're a student, engineer, or simply interested in electrical machines, this quiz will challenge your understanding of induction motor concepts.
Explore topics such as:
- Starting torque and its implications
- Speed control methods
- Motor types and their characteristics
11. The starting torque of a squirrel cage induction motor is ________
Low
Negligible
Same as full load torque
Slightly more than full load torque
12. A double squirrel cage induction motor has__________
two rotors moving in opposite directions
Two parallel windings in stator
Two parallel windings in rotor
Two series windings in stator
13. Star-delta starting of motors is not possible in case of _________
Single phase motors
Variable speed motots
Low horse power motors
High speed motors
14. In case of the induction motors the torque is ___________
Inversely proportional to (√slip )
Directly proportional to (slip)2
Inversely proportional to slip
Directly propotional to slip
15. An induction motor with 1000 r.p.m. Speed will have
8 poles
6 poles
4 poles
2 poles
16. The good power factor of an induction motor can be achieved if the average flux density in the air gap is ___________
Absent
Small
Large
Infinity
17. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor?
By changing the number of stator poles
Rotor rheostat control
By operating two motors in cascade
By injecting e.m.f. In the rotor circuit
18. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type _____________
Star connected only
Delta connected only
Both a & b
None of the above
19. It is advisable to avoid line-starting of induction motor and use starter because ______
Motor takes five to seven times its full load current
It will pick-up very high speed and may go out of step
It will run in reverse direction
Starting torque is very high
20. Rotor rheostat control method of speed control is used for __________
Squirrel-cage induction motors only
Slip ring induction motors only
Both a & b
None of the above
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