In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

shift forward by less than 90°

coincide with the GNA

shift forward by 90°

shift forward by more than 90°

shift forward by less than 90°

coincide with the GNA

shift forward by 90°

shift forward by more than 90°

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

Vt = Ea + Iara+ ILrs

Vt= Ea– Iara

Vt= Ea + Iara

Vt = Ea + Ia(ra + rs)

Vt = Ea + Iara+ ILrs

Vt= Ea– Iara

Vt= Ea + Iara

Vt = Ea + Ia(ra + rs)

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

1000.

0.

500.

2000.

1000.

0.

500.

2000.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

150 V.

223.V.

300 V.

200 V.

150 V.

223.V.

300 V.

200 V.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

Starting torque, operating speed, full load current.

Operating speed.

Starting torque.

Full load current.

Starting torque, operating speed, full load current.

Operating speed.

Starting torque.

Full load current.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

2 mg of KOH / gm.

0.5 mg of KOH / gm.

0.3 mg of KOH / gm.

1 mg of KOH / gm.

2 mg of KOH / gm.

0.5 mg of KOH / gm.

0.3 mg of KOH / gm.

1 mg of KOH / gm.

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Electrical Machines

Electrical Machines In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines The volt-ampere euation for a long-shunt compound motor is given by

Electrical Machines A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

Electrical Machines Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

Electrical Machines If the source voltage of a DC motor is increased, which of the following will decrease?

Electrical Machines Maximum allowable acidity level of power transformer insulating oil is generally taken as

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as