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

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

15.1 Ω

31.9 Ω

15.9 Ω

31.1 Ω

15.1 Ω

31.9 Ω

15.9 Ω

31.1 Ω

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

remains constant.

decreases.

decreases

increases.

remains constant.

decreases.

decreases

increases.

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Electrical Machines
Sparkless commutation can be achieved by employing

inter poles.

any one or more of the above methods.

high resistance carbon brushes.

compensating winding.

inter poles.

any one or more of the above methods.

high resistance carbon brushes.

compensating winding.

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Electrical Machines
In a 3 - ÃŽÂ¦ induction motor

power factor at starting is high as compared to that while running.

power factor at starting is low as compared to that while running.

power factor at starting in the same as that while running.

none of them.

power factor at starting is high as compared to that while running.

power factor at starting is low as compared to that while running.

power factor at starting in the same as that while running.

none of them.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

Mica.

Glass.

Vacuum.

Oil impregnated paper.

Mica.

Glass.

Vacuum.

Oil impregnated paper.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

50 %.

10 %.

25 %.

15 %.

50 %.

10 %.

25 %.

15 %.

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Electrical Machines

Electrical Machines In a DC Shunt Motor if the load current increases then field flux

Electrical Machines Sparkless commutation can be achieved by employing

Electrical Machines In a 3 - ÃŽÂ¦ induction motor

Electrical Machines What type of dielectric material is used in capacitors used for fans and for power factor correction?

Electrical Machines The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

Electrical Machines
Sparkless commutation can be achieved by employing

Electrical Machines
In a 3 - ÃŽÂ¦ induction motor

Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.