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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by interchanging supply terminals.
Rotation can be changed by reversing main winding terminals.
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by interchanging supply terminals.
Rotation can be changed by reversing main winding terminals.
Answer
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Related Question
Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will
not start at all.
rotate in direction opposite to that before maintenance.
get heated and damaged.
rotate in the same direction as before maintenance.
not start at all.
rotate in direction opposite to that before maintenance.
get heated and damaged.
rotate in the same direction as before maintenance.
Answer
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Electrical Machines
Which of the following rotor requires damper winding?
Salient pole rotor.
Cylindrical rotor.
None of these
Both type rotor.
Salient pole rotor.
Cylindrical rotor.
None of these
Both type rotor.
Answer
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Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is
2, 3, 5
1, 4
1, 4, 5
2,3
2, 3, 5
1, 4
1, 4, 5
2,3
Answer
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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.
10 %.
50 %.
25 %.
15 %.
10 %.
50 %.
25 %.
15 %.
Answer
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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?
10%
21%
41%
11%
10%
21%
41%
11%
Answer
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