In EDO ACBs what is a purpose of closing coil and motor,
what is the operation of these devices are they inetconnected.
means if we give supply to motor and by BCS we charge Closing coil,what exact is operation is and how it charge a spring of ACB.
Sir if anybody has an wiring diagram please send me the link
to operate and EDO breaker.
We normally make oil soak pits under Transformers. Oil from
soak pit goes to collection pit.
We provide granules/pebbles under transformers.
My question is weather granules/ pebbles to be filled in
soak pit or not? if yes upto what level?
give me applications of sequence bridges . (used in 3 phase
un balanced systems)
What is the instrument to check the rotating diode fuse of
alternator in running conditions?
what is the necessity of under ground cables ??
what is a types of short circuit and what is a types of
distance protection tests
hi can any body send me syllabus of rrb electrical section
and past pepar also of any board...
why is a power transformer used only occasionally?it is used
to step up at generating stations?and that needs to be done
all day long !!!!!!!
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 meant by flywheel and its role in retardation test
What is the general power factor & min. power rating of
TV,LCD type TV, CRt type TV, Scanner, printer?
Some times to change of DOR of a motor, interchange of R & B is not effected and RYB take same current, but interchange of R&Y is effected ie change the DOR. My doubt is what is the problem in motor and how it is happen.
1)what is the function of a frequency inverter?
2)If a few frequency inverter are connected onto a device
network,what are the two setting that will ensure the
frequency inverter work properly on the network.
3)whats is the name of the input sensor for weigher?
4)How to confirm that the load cellis faulty?
5)Describe briefly the steps to validate that the weigher is
6)Describe the procedure to validate the flowmeter accuracy?
7)Describe briefly the steps to validate that the tempreture
sensor/transformer is working properly.
8)what is the adjustment that need to be done when you are
calibrating the temperature transmitter ?
9)what are the safety measures to be taken before
disconnecting motor for rewinding.
10)whats is the synchronous speed in rpm of typical 4pole
11)whats is the formula for kw, ohm's law
12)if a 3phase motor is rated 3kw,415vac,what is it's rated
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