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.

541.67V, 250 rpm.

2166.67V, 270 rpm.

541.67V, 200 rpm.

2166.67V, 230 rpm.

541.67V, 250 rpm.

2166.67V, 270 rpm.

541.67V, 200 rpm.

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Electrical Machines
A DC generator beyond critical resistance will generate

maximum power.

no voltage.

maximum voltage.

maximum current.

maximum power.

no voltage.

maximum voltage.

maximum current.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

double.

4 times.

one fourth.

half.

double.

4 times.

one fourth.

half.

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

there was no residual magnetism in the field circuit

there was a break in the armature circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was no residual magnetism in the field circuit

there was a break in the armature circuit

field resistance was higher than critical resistance

field winding was wrongly connected

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

increases the hysteresis loss.

None of these

increases the electrical resistivity of iron.

reduces the saturation magnetization.

increases the hysteresis loss.

None of these

increases the electrical resistivity of iron.

reduces the saturation magnetization.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these

AC.

DC.

both of above.

None of these

AC.

DC.

both of above.

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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 A DC generator beyond critical resistance will generate

Electrical Machines Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron

Electrical Machines The emf induced in a conductor rotating in a bipolar field 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
A DC generator beyond critical resistance will generate

Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is