Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

1 and 3

2 and 3

1 and 2

1 alone

1 and 3

2 and 3

1 and 2

1 alone

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Electrical Machines
Slot wedges in a dc machine is made up of

cast iron.

mild steel.

fibre.

silicon steel.

cast iron.

mild steel.

fibre.

silicon steel.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

equal to core loss.

more than core loss.

less than core loss.

zero.

equal to core loss.

more than core loss.

less than core loss.

zero.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

31.9 Ω

31.1 Ω

15.9 Ω

15.1 Ω

31.9 Ω

31.1 Ω

15.9 Ω

15.1 Ω

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

474 V

6 V

234 V

240 V

474 V

6 V

234 V

240 V

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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

The speed will increase in proportion to reduction in load.

The speed will increase gradually.

The speed will remains almost constant.

The speed will increase abruptly.

The speed will increase in proportion to reduction in load.

The speed will increase gradually.

The speed will remains almost constant.

The speed will increase abruptly.

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Electrical Machines

Electrical Machines Slot wedges in a dc machine is made up of

Electrical Machines A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

Electrical Machines
Slot wedges in a dc machine is made up of

Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?