Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / raja
kVA is the unit for apparent power. Apparent power consists
of active and reactive power. Active power is the share of
the apparent power which transmits energy from the source
(generator) to the user. Reactive power is the share of the
apparent power which represents a useless oscillation of
energy from the source to the user and back again.
It occurs when on account of some inertia in the system
there is a phase shift between voltage and current. This
means that the current does not change polarity synchronous
with the voltage. But the heat generated in a winding as
well as the eddy current losses generated in a transformer
core depend on the current only regardless of whether it
aligns with the voltage or not.
Therefore the heat is always proportional to the square of
the current amplitude irrespective of the phase angle (the
shift between voltage and current). So a transformer has to
be rated (and selected) by apparent power.
| Is This Answer Correct ? | 9 Yes | 2 No |
Post New Answer View All Answers
Difference between a pilot wire and a normal conductor?
What is nyquist contour?
what is meant by power and distribution transformer ?
What is the effect of solar radiation on the design of an Isolated Phase Busduct?
can i able to get bhel previous exam question paper?
Does magnetomonopoles exists? one maxwell equation strongly suggests no, but how about their existance in plasma?
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 types domain of laplace transforms? What behavior can laplace transform predict how the system work?
how to define tell me about self
how to carried out tan delta test in 11 KV alternator ?
What is the gross weight to copper ratio in slip ring induction motor of 4000 HP,6.6 kv, 372amp, 992 rpm GE motor.
What is Control & Relay Panel? And Remote Control Center?
What is principle of Floroscent tube 36watt.
why booster transformer is used in sumpners test conducted on transformer????
State The Difference Between Generator And Alternator?
