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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?
Shunt motor.
Cumulative compound motor.
Series motor.
Differential compound motor.
Shunt motor.
Cumulative compound motor.
Series motor.
Differential compound motor.
Answer
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Related Question
Electrical Machines
What is power factor of a 3 - φ induction motor at no load?
Equal to 1.
High.
Low.
Same as full load.
Equal to 1.
High.
Low.
Same as full load.
Answer
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Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are
1, 2, 3 and 5
1, 2 and 3
1 and 3
1, 3 and 5
1, 2, 3 and 5
1, 2 and 3
1 and 3
1, 3 and 5
Answer
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Electrical Machines
The polarity of a DC generator can be reversed by
any of above.
reversing the field current.
increasing field current.
reversing field electric current as well as direction of rotation.
any of above.
reversing the field current.
increasing field current.
reversing field electric current as well as direction of rotation.
Answer
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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where
All of above.
The accuracy in speed control is required.
The speed in both the direction is required.
Very fine speed control over the whole range from zero to normal speed is required.
All of above.
The accuracy in speed control is required.
The speed in both the direction is required.
Very fine speed control over the whole range from zero to normal speed is required.
Answer
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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is
300 W
400W
500 W
250 W
300 W
400W
500 W
250 W
Answer
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