Why DC excitation is used for alternators? Why cant it be AC?
Answer Posted / manoj kumar sahoo
DC which does not change its direction & magnitude .So dc
excitation work properly in alternator without change the
pole.And AC change its direction in 50 c/s. Therefore AC
excitation is not suitable for the alternators.
Is This Answer Correct ? | 3 Yes | 1 No |
Post New Answer View All Answers
what do you mean by plant earthing system.
how ups works ? various parts of ups and working principle
What fomula is used to calculate: 1. rated frequency withstand voltage, and 2. rated lightning impulse withstand voltage.
if 2 coil of 1000W connect in series and 200 v is applied across it . then what is the total power of coil when coil have only resistive load .
1.why we are using metal oxide gapless block in lightning arrester,2.What is minimum and maximum rating of metal oxide blocks using in india
In Power cable specification what is U0/U and Um.
How much kv gas generator is needed to run 2 hp and 1 hp airconditioners, plus a refrigerator and 4 Tvs
An active element is one which a. Supplies energy b. Absorbs energy c. Supplies energy and convert energy from one form to another
What mean by MLTP
Differentiate between magnetic field and magnetic flux?
HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.
What is the physical significance of phase.. i.e. what is exactly the meaning in layman's language.. 1 phase, 3 phase etc ???
what is zinc diffusion?
Why the field rheostat is adjusted such that the voltmeter reads 380V
Difference between On Line capacitor and Station Type capacitor.