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

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, 5

1, 4

2,3

2, 3, 5

1, 4, 5

1, 4

2,3

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

the flux waveform is improved with reduction in harmonics

the inequality of air-gap flux on the top and bottom halves of the armature is removed

a counter-emf is induced in the coil undergoing commutation

the interpoles produce additional flux to augment the developed torque

the flux waveform is improved with reduction in harmonics

the inequality of air-gap flux on the top and bottom halves of the armature is removed

a counter-emf is induced in the coil undergoing commutation

the interpoles produce additional flux to augment the developed torque

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Electrical Machines
The frame of an induction motor is made of

closed grained cast iron.

aluminium.

stainless steel.

silicon steel.

closed grained cast iron.

aluminium.

stainless steel.

silicon steel.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

any one of the connection.

series.

parallel.

no resistance is connected.

any one of the connection.

series.

parallel.

no resistance is connected.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

None of above.

Semi closed slots.

Open slots.

Closed slots.

None of above.

Semi closed slots.

Open slots.

Closed slots.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

more than 30 W

zero watt

30 W

less than 30 W

more than 30 W

zero watt

30 W

less than 30 W

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Electrical Machines

Electrical Machines The introduction of interpoles in between the main poles improves the performance of a dc machine, because

Electrical Machines The frame of an induction motor is made of

Electrical Machines If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

Electrical Machines Which slots are used in the rotor of an induction motor?

Electrical Machines 1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

Electrical Machines
The frame of an induction motor is made of

Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

Electrical Machines
Which slots are used in the rotor of an induction motor?

Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be