Related Questions

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
Which of the following statements regarding repulsion-start induction motor is incorrect ?
A It requires more maintenance of commutator and other mechanical devices
B It makes quite a bit of noise on starting
C In fractional horse power motors, it has replaced the capacitor motors
D It is not easily reversed
Call me if you have any problems regarding your work.' Here 'regarding' is a/an
A gerund
B apposition
C preposition
D conjunction
I know nothing regarding this matter. Here 'regarding' is a _.
A Gerund
B Preposition
C Apposition
D Conjuction
Which is of the following data is required to draw the circle diagram for an induction motor?
A Block rotor test only
B No load test only
C Block rotor test and no-load test
D Block rotor test, no-load test and stator resistance test
For three-phase induction motors which of the following is the least efficient method of speed control?
A Cascade control
B Pole changing
C Rheostat control
D Combination of cascade and pole changing
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor?
A By changing the number of stator poles
B Rotor rheostat control
C By operating two motors in cascade
D By injecting e.m.f. in the rotor circuit
The speed characteristics of an induction motor closely resemble the speed-load characteristics of which of the following machines
A D.C. series motor
B D.C. shunt motor
C Universal motor
D None of the above
Step-less speed control of induction motor is possible by which of the following methods?
A e.m.f. injection in rotor eueuit
B Changing the number of poles
C Cascade operation
D None of the above
Which of the following single-phase induction motors is generally used in time phonographs?
A Resistance start
B Capacitor start capacitor run
C Shaded pole
D Universal

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