Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

2 and 3

1, 2 and 3

1 and 2

1 and 3

2 and 3

1, 2 and 3

1 and 2

1 and 3

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

decreased.

remains same.

kept constant to certain value.

increased.

decreased.

remains same.

kept constant to certain value.

increased.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

It will rotates in normal operation.

Either short circuit or open circuit occurs.

It will rotates in reverse direction.

Fail to start.

It will rotates in normal operation.

Either short circuit or open circuit occurs.

It will rotates in reverse direction.

Fail to start.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

condition of bushings.

condition of transformer.

condition of transformer oil.

condition of bushing stud.

condition of bushings.

condition of transformer.

condition of transformer oil.

condition of bushing stud.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

541.67V, 250 rpm.

2166.67V, 230 rpm.

541.67V, 200 rpm.

2166.67V, 270 rpm.

541.67V, 250 rpm.

2166.67V, 230 rpm.

541.67V, 200 rpm.

2166.67V, 270 rpm.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Rotating part of DC motor is known as

Carbone brush.

Pole.

Starter.

Armature.

Carbone brush.

Pole.

Starter.

Armature.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines Dissolve gas analysis of transformer oil is carried out to determine

Electrical Machines An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

Electrical Machines Rotating part of DC motor is known as

Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

Electrical Machines
Rotating part of DC motor is known as