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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will
improve and the speed falls.
improve and the speed rises.
deteriorate and the speed falls.
deteriorate and the speed rises.
improve and the speed falls.
improve and the speed rises.
deteriorate and the speed falls.
deteriorate and the speed rises.
Answer
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Related Question
Electrical Machines
In a DC generator if field winding attains the critical resistance
machine will generate maximum power.
field winding will burn.
the voltage generated will be zero.
machine will generate maximum voltage.
machine will generate maximum power.
field winding will burn.
the voltage generated will be zero.
machine will generate maximum voltage.
Answer
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Electrical Machines
In electric locomotive which of the following motor are used ?
Synchronous motor.
Shunt motor.
Separately compound motor.
DC series motor.
Synchronous motor.
Shunt motor.
Separately compound motor.
DC series motor.
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 %.
15 %.
50 %.
25 %.
10 %.
15 %.
50 %.
25 %.
Answer
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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is
2, 3 ,5
1, 2, 3
2, 3, 4, 5
2, 3, 4
2, 3 ,5
1, 2, 3
2, 3, 4, 5
2, 3, 4
Answer
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Electrical Machines
Hunting in a synchronous cannot be due to
windage friction.
variable supply voltage.
variable frequency.
variable load.
windage friction.
variable supply voltage.
variable frequency.
variable load.
Answer
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