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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 linearised
 hyperbola
 any of the above

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 start automatically without trouble.
 not start automatically.
 develop very low starting torque.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 3, 5
 1, 2, 5
 1, 2, 3, 4
 2, 3, 4

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
None of these
 decrease
 either increase or decrease

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 torque but not the voltage
 neither the voltage nor the torque
 voltage but not the torque

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

  1 at 90°C.
 2 at 90°C.
 3 at 90°C.
 0.5 at 90°C.

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