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Electrical Machines
Hysteresis loss is proportional to
f2.
f1.5.
f.
f3.
f2.
f1.5.
f.
f3.
Answer
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Related Question
Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes
decrease in speed demanding less armature current.
decrease in speed but armature current remains the same.
increase in speed demanding more armature current.
increase in speed but armature currnet remains the same.
decrease in speed demanding less armature current.
decrease in speed but armature current remains the same.
increase in speed demanding more armature current.
increase in speed but armature currnet remains the same.
Answer
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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is
5.7 Ω
1.9 Ω
6 Ω
2.2 Ω
5.7 Ω
1.9 Ω
6 Ω
2.2 Ω
Answer
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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will
None of these
either increase or decrease
increase
decrease
None of these
either increase or decrease
increase
decrease
Answer
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Electrical Machines
If input of a transformer is square wave the output will be
triangular wave.
pulsed wave.
sine wave.
square wave.
triangular wave.
pulsed wave.
sine wave.
square wave.
Answer
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Electrical Machines
In a step down transformer which one of the following statements is true?
Number of secondary turns is more than that of primary.
Secondary current is less than primary current.
Secondary power is less than primary power.
Number of secondary turns is less than primary turns.
Number of secondary turns is more than that of primary.
Secondary current is less than primary current.
Secondary power is less than primary power.
Number of secondary turns is less than primary turns.
Answer
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