Answer / r.sridharan

In generator there is nothing to limit current.Hence winding will over heat and burn.In order to protect generator we kept at maximum position.
In motor to increase torque at initial condition rheostat is kept at minimum position.

Answer / c saisandeep

GENERATOR rheostat is maximum position in order to protect the winding from high currents suddenly............
MOTOR rheostat is minimum position soo that flux increases .If flux increases the speed of the motor can be reduced....................

Answer / s.laxman

When the field rheostat is in minimum position more current will flow through field and hence more flux and therefore armature current is low and speed is less at the time of start

Answer / ram

Field rheostat is in minimum position because of the motor runs at a rated speed. If the field rheostat is maximum position the motor runs at above the rated speed

Answer / ranganath bhagavathi

At initial condition,we have high armature current,so in order to reduce that we use 3-point starter.
Then after we to kept a constant speed.so if current decreases obviously speed increses.so thats y we decrese the flux/arm current speed increses..

What is the comparision (advantages / disadvantages) of 110V, 60 Hz system to 230 V, 50 Hz system.

2 Answers  

why multiplying factor is used in wattmeter???

1 Answers   Nippon,

Why we use neutral cable just half from phase cable.Tell me briefly,please.

4 Answers  

Briefly describe three methods that are usually used by electricity suppliers to control voltage levels?

0 Answers  

What is the frequency of dc current????

4 Answers   SCS,

What is the IS standard for MCCB to be use (As per capacity of AMP)& for ACB also.

0 Answers  

what is the meaning of trippe time of circuit breaker

1 Answers  

DGs fuel and lube oil filters are not equal to one another.Why it is so.For example one MTU enginee fuel filter is one and lube oil filter-02nos other DGs are more.Please explain

1 Answers  

What do you mean by Frame 5 Gas Turbine as well as Mark II.

0 Answers  

dg earth connect only in the amf panel or not why

0 Answers  

I have a 1000 kVA Transformer(11kV/0.415kV) and a APFC panel of 400 kVAR(LT).Now if i want to remove the LT APFC panel and install a HT(11kV) APFC panel on the HT side is the HT APFC panel will work same as the LT APFC panel(improve the power factor),if yes what will be rating of the HT APFC panel?what is the formula to calculate HT APFC panel rating???

2 Answers  

Dry type transformers

0 Answers