A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

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Electrical Machines
In alternator, the rotary part is

none of these.

armature.

magnetic field poles.

core.

none of these.

armature.

magnetic field poles.

core.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

Olefin based insulating oil.

Paraffin based insulating oil.

Naphtha based insulating oil.

Aromatics based insulating oil.

Olefin based insulating oil.

Paraffin based insulating oil.

Naphtha based insulating oil.

Aromatics based insulating oil.

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

lap-wound machine will have more rated voltage and more current

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated current and more voltage

wave-wound machine will have more rated voltage and less current

lap-wound machine will have more rated voltage and more current

lap-wound machine will have more rated voltage and less current

wave-wound machine will have more rated current and more voltage

wave-wound machine will have more rated voltage and less current

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

Blv.

Bl2v.

Bl2v2.

Blv2.

Blv.

Bl2v.

Bl2v2.

Blv2.

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Electrical Machines
A generator may loose residual magnetism due to

over excitation.

any of these.

vibrations.

heating.

over excitation.

any of these.

vibrations.

heating.

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Electrical Machines

Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines In alternator, the rotary part is

Electrical Machines Which of the following transformer insulating oil generally used in India?

Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

Electrical Machines A generator may loose residual magnetism due to

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
In alternator, the rotary part is

Electrical Machines
Which of the following transformer insulating oil generally used in India?

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

Electrical Machines
A generator may loose residual magnetism due to