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
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%.

940 RPM

970 RPM

960 RPM

920 RPM

940 RPM

970 RPM

960 RPM

920 RPM

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

270.

45.

30.

180.

270.

45.

30.

180.

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Electrical Machines
Which of the following will vary the maximum torque?

rotor reactance X

rotor resistance R

both 1 and 2

None of these

rotor reactance X

rotor resistance R

both 1 and 2

None of these

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

Sandwiched lv and hv discs on each core limb

Half hv inside and half lv outside on each core limb

Half lv inside and half hv outside on each core limb

Lv on one core limb and hv on the other

Sandwiched lv and hv discs on each core limb

Half hv inside and half lv outside on each core limb

Half lv inside and half hv outside on each core limb

Lv on one core limb and hv on the other

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

pure capacitive load

pure inductive load

pure resistive load

None of these

pure capacitive load

pure inductive load

pure resistive load

None of these

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

180.

150.

160.

170.

180.

150.

160.

170.

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Electrical Machines

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 In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

Electrical Machines Which of the following will vary the maximum torque?

Electrical Machines Which is the arrangement of windings in a core type single phase transformer?

Electrical Machines For which of the following loads, armature reaction is magnetizing in nature?

Electrical Machines A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

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
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

Electrical Machines
Which of the following will vary the maximum torque?

Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight