# help needed to solve two problems in electrical engineering!!!

• posted
hi,
I am an undergraduate student of engineering technology. I need help
to solve the following
2 questions for an electrical engineering assignment. I am studying
through correspondence
while holding a full time job and don't have access to a library. The
prescribed text does not
help much. I did some research on the Internet and was able to solve
two other questions relating
to power factor correction but not these.
Can somebody help me to answer these questions?
Q1.
Show with a the aid of a phasor diagram that for both star and delta
the active power is (root 3 VI Cos phi) where V and I are line
quantities.
Q2.
A 200 KVA transformer has 800 turns on the primary and 160 turns on
the secondary.
the primary and secondary resistances are 0.3 ohms and 0.02 ohms, the
corresponding
leakage reactance are 1.1 ohm and 0.07 ohm respectively. If supply
voltage is 2200V,
calculate equivalent impedence referred to secondary and voltage
regulation at
3/4 full load having a p.f of i) 0.85 lag and ii) 0.6 lead
Also,
Are there other resources on the net to help people like me studying
on their own?
(in general, not limited to electrical engineering alone)
I will be very grateful to all who can help.