The complex power absorbed by a load is S= 850∠-25⁰. This means
the load is ________...
The complex power absorbed by a load is S= 850∠-25⁰. This means
the load is ________ and pf is___________(a) Inductive , lagging(b)
Inductive, leading(c) Capacitive, lagging(d) Capacitive,
leading
1) A 25 kVA transformer supplies a
load of 12 kW at power factor of 0.6 lagging. How much kVA can be
added before the transformer is at rated load
a)when the added load is at 1.0
pf?
b)when the added load is at 0.866 pf
leading?
a.) Define constant power load (CPL) and constant voltage load
(CVL). Are power electronics devices constant power loads? If so,
explain why.
b) How can Zener diodes work as voltage stabilizer?
c) Mention the typical value of resistance (Ohm-m) and
conductance (Siemens/meter) for conductors, semiconductors and
insulators.
The power supply frequency is 60Hz.
a) What is the power factor of the load?
b) What is the active power [W] and reactive power
[VAR] consumed by the resistors and inductances?
c) Connect capacitor C to points a and b to set the
power factor of the entire load to 1. What is the capacitance [F]
of the capacitor?
Since there is no picture, just tell me how to solve
it.
THESE ARE QUESTION FROM THE TOPIC VARIABLE LOAD ON POWER
STATIONS FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS PLEASE DO THE
QUESTIONS STEP BY STEP AND IN NEAT HAND WRITTING THE ANSWERS ARE
GIVEN WITH THE QUESTIONS
1) A generating station has a connected load of 40 MW and a
maximum demand of 20 MW : the units generated being 60 × 106.
Calculate (i) the demand factor (ii) the load factor.
ANS [(i) 0·5 (ii) 34·25%]
2) A 100 MW...
A 1.095 L sample of HCl gas at 25 C and 732.0 mmHg was absorbed
completely in an aqueous solution that contained 7.152 g of Na2CO3
and 268.5 g of water.
1) What is the pH of the solution?
2) What is the freezing point of the solution?
3) What is the vapor pressure of the solution? (The vapor
pressure of pure water at 25 C is 23.76 mmHg.)
If you can show work that would be great.
The power dissipated in a resistor is given by P=V2/R , which
means power decreases if resistance increases. Yet this power is
also given by P=I2R , which means power increases if resistance
increases. Explain why there is no contradiction here.
Parasitic power theft:
A power line running East-West at 150kVAC carrying a 75
MWatt load is 10 meters overhead. A thief makes a 100 turn loop of
insulated copper wire around a plastic garbage can with a 70cm
diameter. The voltage generated in this coil is used to charge
batteries for a fish-finder, lights and radio in his fish hut. The
battery charger is electrically equivalent to a 5 ohm
resistor.
a) What orientation of the garbage pail winding will...
distinction between active and real power?
distinction between complex and apparent power?
distinction between effective and rms value of a voltage or
current?
what are three applications of transformer?