A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

36.36% increase

36.36% decrease

18.18% increase

36.36% increase

36.36% decrease

18.18% increase

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

0°

less than 90°

Greater than 90°

90°

0°

less than 90°

Greater than 90°

90°

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Electrical Machines
Type of single phase motor having highest power factor at full load is

capacitor start.

capacitor run.

shaded pole type.

split phase.

capacitor start.

capacitor run.

shaded pole type.

split phase.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

consists of short-circuited copper bars embedded in the field pole faces.

both (A) and (B).

are provided in a synchronous motor to make it self starting.

are provided on the stator for improving power factor.

consists of short-circuited copper bars embedded in the field pole faces.

both (A) and (B).

are provided in a synchronous motor to make it self starting.

are provided on the stator for improving power factor.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

PZL/4Sp²

PZL/ 4Sa

PZL/4Sa²

PZL/4S

PZL/4Sp²

PZL/ 4Sa

PZL/4Sa²

PZL/4S

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Electrical Machines
A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

0.70 Hz.

0.75 Hz.

0.65 Hz.

60 Hz.

0.70 Hz.

0.75 Hz.

0.65 Hz.

60 Hz.

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Electrical Machines

Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines In salient pole synchronous machine, maximum power occurs at a load angle of

Electrical Machines Type of single phase motor having highest power factor at full load is

Electrical Machines The damper windings also called the squirrel cage windings or damper grids

Electrical Machines For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

Electrical Machines A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

Electrical Machines
Type of single phase motor having highest power factor at full load is

Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

Electrical Machines
A 3 - ÃŽÂ¦, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?