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Electrical Machines
In a DC Shunt Motor the speed can be increased by
Increasing the armature current.
Increasing the field current.
Decreasing the field current.
Increasing the field current.
Increasing the armature current.
Increasing the field current.
Decreasing the field current.
Increasing the field current.
Answer
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Related Question
Electrical Machines
The inertia constant H of a synchronous condenser is
greater than that of turbo alternator.
equal to that of the effective length of the line.
none of these.
greater than that of hydro generator.
greater than that of turbo alternator.
equal to that of the effective length of the line.
none of these.
greater than that of hydro generator.
Answer
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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would
remain the same
decrease
become zero
increase
remain the same
decrease
become zero
increase
Answer
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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch
100
10
1
50
100
10
1
50
Answer
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Electrical Machines
Thin laminations are used in a machine in order to reduce
Both 1 and 2
Hysteresis losses
Eddy current losses
Copper losses
Both 1 and 2
Hysteresis losses
Eddy current losses
Copper losses
Answer
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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as
0.5 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
0.3 mg of KOH / gm.
0.5 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
0.3 mg of KOH / gm.
Answer
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