φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

970 RPM

960 RPM

940 RPM

920 RPM

970 RPM

960 RPM

940 RPM

920 RPM

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

40 A.

44 A.

400 A.

440 A.

40 A.

44 A.

400 A.

440 A.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
From no load to full load the slip will

slightly decrease.

slightly increase.

None of these

not change.

slightly decrease.

slightly increase.

None of these

not change.

ANSWER DOWNLOAD EXAMIANS APP

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

Paraffin based insulating oil.

Olefin based insulating oil.

Aromatics based insulating oil.

Naphtha based insulating oil.

Paraffin based insulating oil.

Olefin based insulating oil.

Aromatics based insulating oil.

Naphtha based insulating oil.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

improve with rise in terminal voltage.

deteriorate with fall of terminal voltage.

improve with fall of terminal voltage.

deteriorate with rise in terminal voltage.

improve with rise in terminal voltage.

deteriorate with fall of terminal voltage.

improve with fall of terminal voltage.

deteriorate with rise in terminal voltage.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In case of IM the torque is

directly proportional to slip.

directly proportional to slip2.

inversely proportional to slip.

inversely proportional to Ã¢Ë†Å¡slip.

directly proportional to slip.

directly proportional to slip2.

inversely proportional to slip.

inversely proportional to Ã¢Ë†Å¡slip.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

Electrical Machines From no load to full load the slip will

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

Electrical Machines In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

Electrical Machines In case of IM the torque is

Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

Electrical Machines
From no load to full load the slip will

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

Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

Electrical Machines
In case of IM the torque is