3-PHASE INDUCTION MOTOR-7
3-Phase Induction Motor Quiz
Test your knowledge about 3-phase induction motors with our engaging quiz designed for students and professionals alike. This quiz covers a range of topics related to induction motors, including their operation, components, and applications.
Key Features:
- Multiple-choice questions
- Focus on practical applications and theoretical understanding
- Score tracking and instant feedback
61. A wound rotor induction motor can be distinguished from squirrel cage induction motor by ________________
Diameter of the shaft
Size of frame
Presence of slip ring
Dircetion of rotation
62. Which of the following A.C.motors is used for industrial application?
Commutator motor
3-phase induction motor
DC series motor
Synchronous motor
63. When a squirrel cage induction motor fails to start which of the following could not be the reason for the same?
Uneven air gap
Blown fuses
Overload
One or two phase open
64. The direction of the rotation of a 3-phase induction motor can be reversed by ________
Interchanging any two leads
Supplying low voltage
Reducing load
Reducing frequency
65. Whenever any polyphase induction motor is loaded __________
Induced e.m.f. Decreases and frequency increases
Induced e.m.f. In the rotor remains constant
Induced e.m.f. In the rotor increases and its frequency also increases
Induced e.m.f. In the rotor increases and its frequency falls
66. If a three phase squirrel-cage induction motor runs slow, which of the following could not be the reason for the same?
Shorted stator coils
Low voltage
Overload
High frequency
67. The probable reason for an induction motor running too hot could be _____
Low voltage
Uneven air gap
Clogged ventilating ducts
Any of the above
68. In a 3-phase induction motor, iron loss ___________
In rotor is negligible as compared to that in stator
In stator does not occur
In rotor is equal to iron loss is stator
In rotor is much more than the iron loss in stator
69. Which of the following parameters for an induction motor varies as square of the supply voltage?
Slip
Synchronous speed
Starting current
Maximum running torque
70. In case single phasing occurs in delta connected motor _________
One phase will be seriously overloaded and two others will be slightly overloaded
Two phases will be seriously overloaded and there will be no current in the third phase
There will be no current in one phase
There will be no current in two phases
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