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More due to the impedance levels in the generator

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13y ago

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What is critical resistance of the field circuit of a DC generator?

The value of resistance of shunt field winding beyond which the shunt generator fails to build up its voltage is known as " critical resistance at a given speed it is the maximum field resistance with which the shunt generator excite.


How will a shunt generator behave if the field resistance is greater than the critical resistance?

the shunt generator wont be started .hehe


What is external critical resistance of shunt generator?

it is the resistance with which the generatoe just excite.


What happens to the generated voltage of a self excited generator if shunt field resistance is greater than the critical resistance?

it doesn't develop emf ..........


What are the differences of Long shunt vs short shunt generator?

In long shunt the shunt field winding is in parallel to both generator and series field. In short shunt the shunt field is in parallel to generator only.


Why dc shunt generator does not have armature resistance?

It does have armature resistance.


What are probable causes for not have build up voltage in a shunt generator?

1. Field Flashing. 2. Resistance of the filed winding should be less than critical field resistance. 3. Speed of the motor should be greater than critical speed. 4. Interchange the field connections. 5. Check the commutator surface and brush.


What are the possible reasons for failing the voltage of a dc shunt generator to build up during starting?

Possible reasons for failure of voltage buildup... 1) No residual Magnetism, 2) Field connection may be in reverse manner, 3) Field resistance is greater than critical resistance, 4) Speed is less than Critical speed.


Does series field winding have more resistance or a shunt field winding?

shunt field winding have more resistance than series field winding ************sai ganesh ************269*******


Theory for load test on dc shunt generator?

load test on dc shunt generator is a test to plot the internal and external characteristics of the generator.


What is the difference between a seperately excited DC generator and DC shunt generator?

The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.


Can you use the separately excited shunt generator machine as self excited generator?

You have a seperately excited generator and then you have a shunt generator which has the field winding in parallel with the armature terminals. In DC machines a separately excited generator could be run as a shunt generator provided the field winding is designed to work on the generated voltage. A separately excited alternator needs a DC supply for the field winding. In car alternators that is taken from the main winding via a rectifier and a voltage regulator.