In electrical locomotive engines, the DC series motors is
being used as traction motor. But in new engines like in
WAP7 & WAG9 the 3-phase squiral cage induction motors has
replaced them. So can someone tell me the advantages of
induction motor over dc seris motor in engines points of
could an induction motor be used for regenerative braking in
electric-train control? in this type of application would
some scheme have to be devised to obtain low synchronous
speeds while braking? would induction-motor drive,
therefore, be suitable for passenger service?
sir,in our plant we r using SATEC PM172E power reading
meeters in HT panel side it is monitoring the MB data smart
viewer(sever).but last one week we did not get readings
inthe server only available in meeter.tell me how
communicate meter and server. and also what steps we take
state the working principle of incondenscent tube?
redundant connection in contactor?
Witch do depand of Power factor and theory of power factor?
what is meant by residual over voltage & residual earth
What is the procedure/activities to be taken to inject the
current more than 2000A by using 2000A Loading Transformer?
The loads are connected with phase and ground then why current
flow as the loads ?
how does WTI work ?
7- What is the Dissipation Factor and the difference
between it and Insulation Resistance Test?
8- What is the task (function) of DC and AC reactors in
9- What is the task (function) of (open delta with
earthed) in some types in transformers?
10- What is the base of the selection of the vector group
11- What is the zig-zag transformer and its function by
drawing in large detail?
12- What is the polarity ?
13- Why we make short between phase(R) in high side and
phase (r) in low side in vector group test?
Where High Side ( R ,S and T ) and Low Side (
r ,s and t ).
14- What are the time on delay and time off delay?
15- What is the vector group?
15- What is the task (function) of different types of
vector group such as Dyn11 , Dd0 , YNd1,……..,?
it is possible to measurement of tension of slipring
induction motor(SRIM)carbon brushes, any maesuring
instruments are available in the markets.
Why do we apply both Differential and REF (HV and LV)
protection schemes on YNyn configuration of a transformer?
Why do we avoid electrical conduits in floors at apartments?