A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

more than 6 V

zero

less than 6 V

6 V

more than 6 V

zero

less than 6 V

6 V

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Tappings of a transformer are provided

at the phase end of hv side

at the middle of hv side

at the phase end of lv side

at the neutral side end of hv side

at the phase end of hv side

at the middle of hv side

at the phase end of lv side

at the neutral side end of hv side

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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

start working as induction motor.

continue to work as synchronous motor with same direction of rotation.

continue to work as alternator but the direction of rotation will reverse.

come to stand still.

start working as induction motor.

continue to work as synchronous motor with same direction of rotation.

continue to work as alternator but the direction of rotation will reverse.

come to stand still.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

provide starting torque only.

prevent hunting and provide the starting torque.

reduce the eddy currents.

reduce noise level only.

provide starting torque only.

prevent hunting and provide the starting torque.

reduce the eddy currents.

reduce noise level only.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

0.649.

0.512.

0.443.

0.573.

0.649.

0.512.

0.443.

0.573.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

increase.

None of these

either of these.

decrease.

increase.

None of these

either of these.

decrease.

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Electrical Machines

Electrical Machines Tappings of a transformer are provided

Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

Electrical Machines In synchronous motor, the damper winding is generally used to

Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

Electrical Machines In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

Electrical Machines
Tappings of a transformer are provided

Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

Electrical Machines
In synchronous motor, the damper winding is generally used to

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs