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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately
parabola
any of the above
linearised
hyperbola
parabola
any of the above
linearised
hyperbola
Answer
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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm
0.25Ω.
0.23Ω.
0.5Ω.
1Ω.
0.25Ω.
0.23Ω.
0.5Ω.
1Ω.
Answer
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Electrical Machines
Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ?
3 and 5
2, 3 and 4
1, 2 and 5
1 and 4
3 and 5
2, 3 and 4
1, 2 and 5
1 and 4
Answer
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Electrical Machines
Which single phase motor is used for a refrigerator?
Universal.
Split phase.
Capacitor run.
Repulsion.
Universal.
Split phase.
Capacitor run.
Repulsion.
Answer
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Electrical Machines
In a DC generator the actual flux distribution depends upon
all of above.
clearance between tips of the adjacent pole shoes.
shape of the pole shoe.
size of air gap.
all of above.
clearance between tips of the adjacent pole shoes.
shape of the pole shoe.
size of air gap.
Answer
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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as
2 at 90°C.
0.5 at 90°C.
1 at 90°C.
3 at 90°C.
2 at 90°C.
0.5 at 90°C.
1 at 90°C.
3 at 90°C.
Answer
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