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
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

240 V

234 V

474 V

6 V

240 V

234 V

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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 _____________.

15 %.

10 %.

25 %.

50 %.

15 %.

10 %.

25 %.

50 %.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

stator winding.

None of these

either stator winding or rotor winding.

rotor winding.

stator winding.

None of these

either stator winding or rotor winding.

rotor winding.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

970 RPM

920 RPM

940 RPM

960 RPM

970 RPM

920 RPM

940 RPM

960 RPM

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Electrical Machines
which of the following type of brush and their application is/are correct

carbon brush → normal ratings

electro graphite → large ratings

All of these

copper graphite → low voltage high current density

carbon brush → normal ratings

electro graphite → large ratings

All of these

copper graphite → low voltage high current density

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

silicon steel.

cast iron.

mild steel.

fibre.

silicon steel.

cast iron.

mild steel.

fibre.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

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 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 Rotating magnetic field is produced in an induction motor because of

Electrical Machines φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines which of the following type of brush and their application is/are correct

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

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
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
Rotating magnetic field is produced in an induction motor because of

Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines
which of the following type of brush and their application is/are correct

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