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
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

field resistance was higher than critical resistance

there was no residual magnetism in the field circuit

field winding was wrongly connected

there was a break in the armature circuit

field resistance was higher than critical resistance

there was no residual magnetism in the field circuit

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Electrical Machines
A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

½ ( ф - фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in two diametrically opposite quadrants and ½ ( ф - фᵢ ) in the remaining two Quadrants

½ ( ф + фᵢ ) in two adjacent quadrants and ½ ( ф - фᵢ ) in the remaining two quadrants

½ ( ф - фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in all the four quadrants

½ ( ф + фᵢ ) in two diametrically opposite quadrants and ½ ( ф - фᵢ ) in the remaining two Quadrants

½ ( ф + фᵢ ) in two adjacent quadrants and ½ ( ф - фᵢ ) in the remaining two quadrants

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Electrical Machines
The brushes of a DC machine should be placed on the

commutator in the inter polar axis.

commutator in the polar axis.

armature in the polar axis.

armature midway between poles.

commutator in the inter polar axis.

commutator in the polar axis.

armature in the polar axis.

armature midway between poles.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

4 KVA

0 KVA

6 KVA

10 KVA

4 KVA

0 KVA

6 KVA

10 KVA

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

Power factor and field current.

Armature current and field current.

Torque and field current.

Armature current and torque.

Power factor and field current.

Armature current and field current.

Torque and field current.

Armature current and torque.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

It will becomes four times.

It will be doubled.

It will be halved.

It will remain the same.

It will becomes four times.

It will be doubled.

It will be halved.

It will remain the same.

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Electrical Machines

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 A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

Electrical Machines The brushes of a DC machine should be placed on the

Electrical Machines A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

Electrical Machines In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

Electrical Machines If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

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
A bipolar dc machine with interpoles has a main-pole flux of ф per pole and an interpole flux of Фᵢ per pole. The yoke of the machine is devide into four quadrants by the main-pole axis and The commutation axis. The flux-distribution in the quadrants will be

Electrical Machines
The brushes of a DC machine should be placed on the

Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?