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, 250 rpm.

541.67V, 200 rpm.

2166.67V, 230 rpm.

2166.67V, 270 rpm.

541.67V, 250 rpm.

541.67V, 200 rpm.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Around 90 %

Around 100 %.

Any where between 75 % and 90 %.

Less than 50 %

Around 90 %

Around 100 %.

Any where between 75 % and 90 %.

Less than 50 %

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

changing the field excitation.

varying the speed.

varying the applied voltage.

changing the load.

changing the field excitation.

varying the speed.

varying the applied voltage.

changing the load.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

Shaded pole

Resistance split phase

Capacitor start

Capacitor run

Shaded pole

Resistance split phase

Capacitor start

Capacitor run

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

either increase or decrease

decrease

None of these

increase

either increase or decrease

decrease

None of these

increase

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Electrical Machines
A 220 V DC machine has an armature resistance 1ÃŽÂ©. If the full load current is 20 A, the difference of induced voltage and generator is

60 V.

0 V.

20 V.

40 V.

60 V.

0 V.

20 V.

40 V.

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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 In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

Electrical Machines Which of the following motor has the highest power factor at full load?

Electrical Machines In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

Electrical Machines A 220 V DC machine has an armature resistance 1ÃŽÂ©. If the full load current is 20 A, the difference of induced voltage and generator is

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
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

Electrical Machines
Which of the following motor has the highest power factor at full load?

Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

Electrical Machines
A 220 V DC machine has an armature resistance 1ÃŽÂ©. If the full load current is 20 A, the difference of induced voltage and generator is