why induction motors are rated at 0.8 power factor.

0 Answers   Bhel, TN,

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Can u explain : how capacitor act when the supply is given is a.c and d.c. I know that when d.c supply is given then the capacitor charges and becomes open circuited. But please say about when a.c is given. I have seen that when a.c supply is given ,it charges and discharges, But when we plug in capacitor to our daily supply and take it out ,then we join those wires spark will appear,which seems charge is present ,but when a.c is given it should charge and discharge

3 Answers  

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what are the values to be accepted on 3 core 185sq mm for 11000volts on insulation resistance between conductors and between conductors and earthed?

3 Answers  

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How conventional fire alarm system works?

1 Answers  

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who to select a swicth fuse unit......?

2 Answers  

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Sir, why generating power plant operating at above 0.9 lag? detail explaination?

1 Answers   Kirloskar, L&T,

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what is diffrence between primary & secondry transformer?

3 Answers  

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what type of current supply is given to house holds?

7 Answers  

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What id difference between power and energy?

0 Answers  

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In a Synchronous generator, Can AC voltage be used instead of DC voltage in field winding of rotor to produce AC power?

10 Answers   NTPC, Windia,

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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.

0 Answers  

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What happen if we re-start H.T motor whose rotor is running at 40% rated speed. Is it will damage motor winding?

1 Answers  

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