Why the transformer will burn if DC supply is given?
Latest Answer: In transformer coil introduced reactance which cause sufficient reduction of
current, but in case of DC supply frequency is 0 so the reactance hence a large
current flow which cause burning of coil as heat produced depend upon current.
Heat Energy ...
In syncronous machines, less slip is useful or more slip is useful? Why?
Latest Answer: The slip in syn. machine should remain zero , because if there is slip than it is not syn, machine.As far as slip is concerned , it is relevent in induction motors. ...
One advantage of syncronous generator is that there is no possibility of armature conductors flying off. What do you mean by flying off?
Can we recognise if motor is series or shunt by visual inspection? If yes how?
Latest Answer: Yes, we can in the lab, theire is a winding denotes on the machine panel where it is the series or shunt motor, where series motor having less no. of turns of field in seies with armature and shunt has more no. of turns of field in shunt with armature. ...
Why soft starter is provided for higher rating motor?
Latest Answer: For a high rating motor the torque is very high. We require a high starting curent in the very begining to develop this torque, so the starter is kept soft so that it does not make the motor off for increasing value of current but the process is done ...
What is the difference between Earthing and Grounding?
Latest Answer: Earthing means connecting star terminal or neutral terminal of 3 phase sytem to earth directly or through resistance in case of generator & reactance in case of motor. These are used fo transformer, generator, motor, etc.
Grounding means connecting ground ...
The ceiling fan rotates in anticlockwise direction, Why?
Latest Answer: This is basically depends upon the angle of the blades, there is no specified reasson for that, if we change the direction without changing the angle then the air will be sucked inside. ...
If the position of rheostat is changed from minimum position to maximum position in D.C shunt motors speed is increased, how?
Latest Answer: In D.C shunt machine by inserting the rheostat in the field we can increase the speed above the base speed in the ratio 3:1 but above that machine get overheated. When we increase the resistance field current get reduced due to that flux get reduced cause ...
Why ceiling fan rotates in anticlockwise direction?
The designed capacity of the transformer was 1600 watt. The utility company is in shortage of such wattage, so they used two 800 watt transformers in parrallel. The utility company uses only one circuit
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