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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with
constant supply voltage V, starting torque Tst decreases
constant V, Tst increases
None of these
either of these
constant supply voltage V, starting torque Tst decreases
constant V, Tst increases
None of these
either of these
Answer
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Related Question
Electrical Machines
_____________ types of induction motor are widely used.
Slip ring IM.
Three phase IM.
Single phase IM.
Squirrel cage IM.
Slip ring IM.
Three phase IM.
Single phase IM.
Squirrel cage IM.
Answer
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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be
3.05+j5.08 ohms
53+j85 ohms
3.5+j5.8 ohms
8+j13 ohms
3.05+j5.08 ohms
53+j85 ohms
3.5+j5.8 ohms
8+j13 ohms
Answer
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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?
1.4.
1.5.
1.2.
1.8.
1.4.
1.5.
1.2.
1.8.
Answer
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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is
series.
differential compound.
shunt.
cumulative compound.
series.
differential compound.
shunt.
cumulative compound.
Answer
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Electrical Machines
Methods of synchronizing of alternator may be done by
one dark two bright.
all of these.
all bright lamp method.
all dark lamp method.
one dark two bright.
all of these.
all bright lamp method.
all dark lamp method.
Answer
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