Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

1, 2 and 3

1, 2, 3 and 5

1, 3 and 5

1 and 3

1, 2 and 3

1, 2, 3 and 5

1, 3 and 5

1 and 3

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

changes to three times the original value

changes to 1.5 times the original value

changes to 0.5 times the original value

remain the same as the original

changes to three times the original value

changes to 1.5 times the original value

changes to 0.5 times the original value

remain the same as the original

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

magnetizing electric current and back emf.

None of these

the rotating stator flux and rotor flux.

the supply voltage and the back emf.

magnetizing electric current and back emf.

None of these

the rotating stator flux and rotor flux.

the supply voltage and the back emf.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these

power factor and dc excitation at constant load

power factor and supply voltage during hunting

supply voltage and field current at constant excitation

All of these

power factor and dc excitation at constant load

power factor and supply voltage during hunting

supply voltage and field current at constant excitation

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Electrical Machines
A shaded pole single phase induction motor can be used for

food mixers

wet grinders

personal computers as cooling fan

tape recorders

food mixers

wet grinders

personal computers as cooling fan

tape recorders

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

any of the above.

leading power factor.

lagging power factor.

unity power factor.

any of the above.

leading power factor.

lagging power factor.

unity power factor.

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Electrical Machines

Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines The torque angle, in a synchronous motor, is the angle between

Electrical Machines An inverted V-curve of synchronous motor shows the variation of

Electrical Machines A shaded pole single phase induction motor can be used for

Electrical Machines When excitation is increased (over excitation), the synchronous generator operates at

Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines
The torque angle, in a synchronous motor, is the angle between

Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

Electrical Machines
A shaded pole single phase induction motor can be used for

Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at