Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

1, 4

2, 3 , 5

2, 4 ,5

1, 3, 5

1, 4

2, 3 , 5

2, 4 ,5

1, 3, 5

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Electrical Machines
Slip rings of an induction motors are made of

aluminium.

carbon.

phosphor bronze.

stainless steel.

aluminium.

carbon.

phosphor bronze.

stainless steel.

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Electrical Machines
Which of the following is the largest conversion device?

Synchronous machine

Induction machine

DC machine

All of these

Synchronous machine

Induction machine

DC machine

All of these

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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, 4

1, 2, 3

2, 3 ,5

2, 3, 4, 5

2, 3, 4

1, 2, 3

2, 3 ,5

2, 3, 4, 5

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

None of above.

Field current.

Armature current.

Line current.

None of above.

Field current.

Armature current.

Line current.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

Can't be determined.

None of these.

15 N.

20 N.

Can't be determined.

None of these.

15 N.

20 N.

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Electrical Machines

Electrical Machines Slip rings of an induction motors are made of

Electrical Machines Which of the following is the largest conversion device?

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

Electrical Machines Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

Electrical Machines A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

Electrical Machines
Slip rings of an induction motors are made of

Electrical Machines
Which of the following is the largest conversion device?

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

Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?