why 30kva ups buzzing(hamming) sound?
Answer Posted / rancho
due to corona effect
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
WHICH SIZE A.B.CABLE IS USED FOR 11KV.
What are IR values and what it should be for coil and for insulator
Mention the disadvantages of low power factor?
If one lamp connects between two phases it will glow or not?
what is efficient motors and how it is different from normal induction motors
In control room of our one plant there is a continuously the incoming power goes to PC is vary,means in stabilizer it continuously indicate from high input to low and low input to high. what is the reason and its solution.
Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault
why magnet has north and south poles only why not east and west and why we are considering as north and south poles? why cant we consider as east and west?
What is the function of attenuator in cro?
orifice sizing how done, checking & selection
with help of neat sketch explain principle of TIG welding process
What is ferro-resonance in electrical system? Why it occurs and what are measures to prevent it?
What are the relays in ACB and VCB
What is the phase relationship between the primary and secondary voltages of a transformer?
How I can Compare 120v/60Hz versus 220v/50Hz ? Please tell me both advantage and disadvantage ......