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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is
0.5.
Greater than 1.
near to 1.
0.25.
0.5.
Greater than 1.
near to 1.
0.25.
Answer
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Related Question
Electrical Machines
What is the highest possible speed of turbo alternators?
1000 rpm
3000 rpm
1500 rpm
4000 rpm
1000 rpm
3000 rpm
1500 rpm
4000 rpm
Answer
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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as
T ∝ √P.
T ∝ P.
T is independent of P.
T2 ∝ P3.
T ∝ √P.
T ∝ P.
T is independent of P.
T2 ∝ P3.
Answer
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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would
increase.
not change.
decrease.
None of above.
increase.
not change.
decrease.
None of above.
Answer
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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by
sf / 2.
sf.
f / s.
s2.
sf / 2.
sf.
f / s.
s2.
Answer
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Electrical Machines
For an ideal transformer the winding should have
maximum resistance on primary side and least resistance on secondary side
no ohmic resistance on either side
equal resistance on primary and secondary side
minimum resistance on primary side and maximum resistance on secondary side
maximum resistance on primary side and least resistance on secondary side
no ohmic resistance on either side
equal resistance on primary and secondary side
minimum resistance on primary side and maximum resistance on secondary side
Answer
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