Why dc voltage used to excite alternator field in stead of ac?
Answer Posted / sankaranarayanan
field flux produced by dc supply is constant where as in ac
supply will not give a constant field flux
So, alternator output will not constant.
Is This Answer Correct ? | 4 Yes | 2 No |
Post New Answer View All Answers
can we start slipring motor on star delta like we start induction motor ? if yes where will we connect ?
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
bitumar
What happens when two positively charged material is placed together?
what are the standard IR values should be of R-E, Y-E, B-E, R-Y, Y-B, B-R of VCB in closed condition and in open condition for 500KVA & 1000KVA transformers. and what is the acceptable range when tested by 5000V megger.
what is the difference between directional & non directional earth fault with example please explain.
Explain Active power,reactive power,how its related to each other , & inductive ,capacitive.
Define non-touching loop.
Why hydropower stations are preferred solution for meeting peak loads in grids?
Explain what is rated speed?
how can calculation ate Amps for cabel. Ex-for 1sqmm wire hou many amps we can draw
i am going to correct power factor of 1600kw induction motor,when i calculate capacitance of capacitor it is three time more in star connection than delta. if motor is star connected which connection i shall adopt for capacitors and reason for adopt this connection
any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?
how to find out cable size if load is 2800 watts, 230 volts AC supply and load distance is 1800 meters
What are the electrical engineer roles and responsibilities in chemical plant?