A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

1.8 9 Ω

1.79 Ω

3.1 Ω

2 .1 Ω

1.8 9 Ω

1.79 Ω

3.1 Ω

2 .1 Ω

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these

On yoke in the pole faces.

On armature.

On yoke in the inter pole gap.

None of these

On yoke in the pole faces.

On armature.

On yoke in the inter pole gap.

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

3.5 mWb.

1.2 mWb.

1.4 mWb.

2.7 mWb.

3.5 mWb.

1.2 mWb.

1.4 mWb.

2.7 mWb.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

large and thin

less and thick

large and thick

less and thin

large and thin

less and thick

large and thick

less and thin

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Electrical Machines
Cross magnetization effects which of the following?

commutation

both 2 and 3

reduction in main field flux

reduces the terminal voltage

commutation

both 2 and 3

reduction in main field flux

reduces the terminal voltage

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

Depends on other factor.

Remain unchanged.

Increase by 5%.

Reduce by 5%.

Depends on other factor.

Remain unchanged.

Increase by 5%.

Reduce by 5%.

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Electrical Machines

Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines Compensating windings is placed in which part of a D.C motor?

Electrical Machines A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

Electrical Machines Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

Electrical Machines Cross magnetization effects which of the following?

Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
Compensating windings is placed in which part of a D.C motor?

Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

Electrical Machines
Cross magnetization effects which of the following?

Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will