3-PHASE INDUCTION MOTOR - 6
3-Phase Induction Motor Quiz
Test your knowledge on 3-phase induction motors with this engaging quiz designed for electrical engineering enthusiasts and professionals alike. Dive into a series of challenging questions that cover fundamental principles, operational characteristics, and technical specifics of induction motors.
- Evaluate your understanding of induction motor mechanics.
- Enhance your grasp of electrical concepts and their applications.
- Perfect for students and professionals in the electrical field.
51. Each of the following statements regarding stator flux of an induction motor is true except _________
It induces e.m.f. In the rotor bars
Its magnitude depends on the motor load
It is constant in magnitude
It revolves around the stator at synchronous speed
52. When a load on a squirrel-cage induction motor is increased from no-load to full-load, which of the following statement is incorrect?
Slip increases
The magnetizing component of the stator exiting current is increased
Stator power factor is improved
Torque developed by the motor increases till it equals the applied torque
53. The principle of operation of a 3-phase induction motor is most similar to that of ____
Transformer with a shorted secondary
Synchronous motor
Capacitor-start induction run motor
Repulsion-start induction motor
54. A squirrel cage induction motor running on no-load is loaded, which of the following statements is incorrect?
Current in the rotor bars decreases
Motor speed decreases
Torque developed by the rotor increases
Stator flux cuts the rotor bars more rapidly
55. When a double squirrel cage motor is started, the current induced in the rotor _____
Flows mostly through the upper winding
Flows mostly through the lower winding
Is directly proportional to the impedance offered by the each cage
Is equally divided between the two windings
56. Regarding single-phasing of a 3-phase induction motor under running conditions which of the following statements is incorrect?
It will stop and blow the remaining fuses
It will continue to run without damage if it is carrying half load or less
It will stop and promptly burnt out if it is heavily overloaded
It will try to keep running though over-heating of part of its winding if it is carrying full-load or slight overload
57. If ‘s’ is the slip and ‘f’ is the supply frequency, the frequency of rotor current is given by _________
S.f
S2f
S.f❄2
F❄s
58. Which of the following statements is correct about an induction motor?
It is self starting with high torque
It is self starting with zero torque
It is self starting with small torque as compared to rated torque
None of the above
59. Type of bearing used for 25 H.P. Motor is ___________
Roller bearing
Bush bearing
Needle bearing
Ball bearing
60. When an induction motor is switched on, the rotor frequency is ___________
Zero
60 HZ
Same as slip frequency
Same as supply frequency
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