A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

3.1 Ω

2 .1 Ω

1.79 Ω

1.8 9 Ω

3.1 Ω

2 .1 Ω

1.79 Ω

1.8 9 Ω

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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, 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.

2166.67V, 230 rpm.

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Electrical Machines
Voltage regulation of transformer is given by

(E2 - V2) / E2

(V2 - E2) / E2

(V2 - E2) / V2

(E2 - V2) / V2

(E2 - V2) / E2

(V2 - E2) / E2

(V2 - E2) / V2

(E2 - V2) / V2

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

36°

30°

18°

72°

36°

30°

18°

72°

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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

field winding was wrongly connected

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

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Electrical Machines
What is the function of inter pole in DC generator?

To serve the economical aspects.

Both option B and C.

To neutralize the distortion of main field flux due to armature reaction.

To get a superior commutation.

To serve the economical aspects.

Both option B and C.

To neutralize the distortion of main field flux due to armature reaction.

To get a superior commutation.

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Electrical Machines

Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

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 Voltage regulation of transformer is given by

Electrical Machines To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

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 What is the function of inter pole in DC generator?

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

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
Voltage regulation of transformer is given by

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

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
What is the function of inter pole in DC generator?