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Electrical Machines
The synchronous reactance( Xs) is the
reactance due to leakage flux
combined reactance due to armature reaction and leakage flux
reactance due to armature reaction of the machine
reactance either due to armature reaction or leakage flux
reactance due to leakage flux
combined reactance due to armature reaction and leakage flux
reactance due to armature reaction of the machine
reactance either due to armature reaction or leakage flux
Answer
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Related Question
Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is
1/4.
4.
8.
1/2.
1/4.
4.
8.
1/2.
Answer
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Electrical Machines
What are slot wedges in a DC machine made of?
Fibre.
Mild steel.
Cast iron.
Silicon steel.
Fibre.
Mild steel.
Cast iron.
Silicon steel.
Answer
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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by
Connecting an additional resistance in stator circuit.
Connecting an additional resistance in the armature circuit.
Any of the above.
Connecting an additional resistance in the field circuit.
Connecting an additional resistance in stator circuit.
Connecting an additional resistance in the armature circuit.
Any of the above.
Connecting an additional resistance in the field circuit.
Answer
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Electrical Machines
Slip rings of an induction motors are made of
stainless steel.
phosphor bronze.
aluminium.
carbon.
stainless steel.
phosphor bronze.
aluminium.
carbon.
Answer
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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
160.
150.
170.
180.
160.
150.
170.
180.
Answer
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