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
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?

2166.67V, 230 rpm.

2166.67V, 270 rpm.

541.67V, 200 rpm.

541.67V, 250 rpm.

2166.67V, 230 rpm.

2166.67V, 270 rpm.

541.67V, 200 rpm.

541.67V, 250 rpm.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

Oil impregnated paper.

Glass.

Vacuum.

Mica.

Oil impregnated paper.

Glass.

Vacuum.

Mica.

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

Any of above.

Inserting resistance to armature circuit and field circuit.

Inserting an additional resistance in the field circuit.

Inserting an additional resistance in the armature circuit.

Any of above.

Inserting resistance to armature circuit and field circuit.

Inserting an additional resistance in the field circuit.

Inserting an additional resistance in the armature circuit.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

Constant.

Proportional to the square of armature current.

Inversely proportional to armature current.

Proportional to armature current.

Constant.

Proportional to the square of armature current.

Inversely proportional to armature current.

Proportional to armature current.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

112.5 W

75 W

168.75 W

50 W

112.5 W

75 W

168.75 W

50 W

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

Series motor.

Shunt motor.

Cumulative compound motor.

Differential compound motor.

Series motor.

Shunt motor.

Cumulative compound motor.

Differential compound motor.

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Electrical Machines

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 What type of dielectric material is used in capacitors used for fans and for power factor correction?

Electrical Machines Which of the following is done in speed control of DC motor by field flux control?

Electrical Machines For higher values of armature, the speed of a DC series motor is

Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

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
What type of dielectric material is used in capacitors used for fans and for power factor correction?

Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

Electrical Machines
For higher values of armature, the speed of a DC series motor is

Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?