A four-story office building has a required load of 60000voltamperes and single-phase 240volt feeder circuits supplying the general lighting load, Determine the minimum required current to feed the ungrounded circuit conductors.

Assertion: In an AC, only capacitor circuit has instantaneous power equal to zero at any instant of time. Reason Phase difference between current function and voltage function is 180°. (1) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (2) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (3) Assertion is true but Reason is false. (4) Both Assertion and Reason are false.

Which of the following capacitors could be used to replace a 188-microfarad, 250-volt starting capacitor? Select one: A. 188 MICROFARAD, 120 VOLT B. 259 MICROFARAD, 120 VOLT C. 200 MICROFARAD, 250 VOLT D. 300 MICROFARAD, 250 VOLT

The total kVA rating of capacitors required to raise the full-load power factor of a 3-phase,  440 V, 50 Hz induction motor  from 0.75 to 0.85 lagging is Qc = 15 KVAR. Capacitors are delta connected. (i) Determine the line current drawn by the capacitor bank  (ii) Determine the phase current of the capacitor bank  (iii) Determine the capacitive reactance per phase Xc (iv) What will be the capacitance per phase if the capacitors are delta connected ?

In a 132 kV, 3-phase, 50 Hz power system, the line to ground capacitance is 0.03 μF and the inductance is 6H. Calculate the following: (1) Voltage appearing across the breaker pole when a magnetizing current of 7 A (Instantaneous value) is interrupted. (2) Resistance to be connected across the contacts to eliminate the restriking voltage.

A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters   Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 10­­8 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot.    ii) Ignoring the phase voltage, determine the insulator voltage after 2µs.

A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 10­­8 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot.  ii) Determine the time of travel from tower top to tower foot.  iii) Determine the time of travel from cross arm to tower foot.                      iv) Draw the voltage lattice diagram with proper labels of the time.  v) Ignoring the phase voltage, determine the insulator voltage after 2µs.   b) The insulator voltage approaches a constant value after 2 µs. If the basic impulse insulation level (BlL) of the insulator for phase conductor is 150 kV, evaluate the condition of the…

I have already answer but can please help to understand calculations..i will give vote   A 240 kV, 3-phase, 50 Hz, 400 km transmission line has a capacitance to earth of 0.04 µF/km per phase. Calculate the inductance and kVA rating of the Peterson coil used for earthing the above system.

A 200 – ohm resistor, 130 millihenry inductor, and a 66 microfarad are placed in parallel across a 120 – V, 60 – Hz AC line. Calculate the following: a.) RESISTOR CURRENT b.) INDUCTOR CURRENT c.) CAPACITOR CURRENT d.) TOTAL CURRENT e.) PHASE ANGLE f.) TOTAL IMPEDANCE DRAW THE PHASOR DIAGRAM IF POSSIBLE AND ROUND OFF TO FOUR DECIMAL PLACES.