following are the questions asked in interviews:
1) Considering the short circuit fault, which switchgear is
preferable, SFU OR MCCB?
Which operates faster? whicg one is popular in Indian Market
and why?
2)Define SCPD. What is type2 coodination?
3)Why the contactor rating is higher for the fuseless
selection than for fuse selection? whether the ratinf of SFU
or MCCB remains the same in both the cases?
4)If the HP rating is known then can you calculate the
ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without
using the selection chart?
what is a tri vector meter? what are the tri vectors?
The exciting current of a transformer is non sinusoidal. why?
A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n)?
I If i have 2kv ups in which 38Amp *8battries hou many hour's back up i get from 600Watts
expansion of rccb
why capacotors burnt out
why maintain the Dg PF is 0.8? Explain?
How can we calculate the power factor of an electrical appliance ? Is there any formula ? Is there any meter around to calculate it ? And how to use that meter ? thanks
what are the necessary basic electrical topics to learn for mechanical engineer to deal practical problems.
As per BIS, Earth pit resistence value?
Define heating time constant of electric motor.
How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........