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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is
0 Hz
25 Hz
100 Hz
50 Hz
0 Hz
25 Hz
100 Hz
50 Hz
Answer
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Related Question
Electrical Machines
Compensating windings is placed in which part of a D.C motor?
On yoke in the inter pole gap.
On yoke in the pole faces.
None of these
On armature.
On yoke in the inter pole gap.
On yoke in the pole faces.
None of these
On armature.
Answer
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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be
250 V.
zero.
very small, say about 2 or 3 V.
about 100 V.
250 V.
zero.
very small, say about 2 or 3 V.
about 100 V.
Answer
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Electrical Machines
Armature reaction in DC generators will result in
increase in slip.
reduction in generated emf.
open circuit.
short circuit.
increase in slip.
reduction in generated emf.
open circuit.
short circuit.
Answer
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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%.
940 RPM
970 RPM
960 RPM
920 RPM
940 RPM
970 RPM
960 RPM
920 RPM
Answer
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Electrical Machines
When maximum starting torque is obtained, rotor power is
Answer
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