In: Electrical Engineering

Three equal impedances, 60 + j30 Ω each, are delta-connected to a 230-V rms, three-phase circuit. Another three equal impedances, 40 + j10 Ω each, are wye-connected across the same circuit at the same points. Determine: (a) the line current (b) the total complex power supplied to the two loads (c) the power factor of the two loads combined

A three-phase motor is delta connected to a 415 V, 60 Hz line.
If the line current is 25 A and the motor power factor is 0.75, how
much power is consumed by the motor (a) Determine the size of the
bank of three capacitors to improve the power factor of the motor
to 0.95. The capacitors are delta connected. (b) If two of the
motors work together, what is the size of capacitors to correct the
power factor to...

An AC generator supplies an rms voltage of 230 V at 60.0 Hz. It
is connected in series with a 0.300 H inductor, a 4.30 μF capacitor
and a 256 Ω resistor.
What is the impedance of the circuit?
What is the rms current through the resistor?
What is the average power dissipated in the circuit?
What is the peak current through the resistor?
What is the peak voltage across the inductor?
What is the peak voltage across the capacitor?...

An AC generator supplies an rms voltage of 230 V at 60.0 Hz. It
is connected in series with a 0.400 H inductor, a 3.40 μF capacitor
and a 206 Ω resistor.
What is the impedance of the circuit? Tries 0/20
What is the rms current through the resistor? Tries 0/20
What is the average power dissipated in the circuit? Tries
0/20
What is the peak current through the resistor? Tries 0/20
What is the peak voltage across the inductor?...

A balanced three-phase delta-connected source has a line veltage
of 120 V. It is connected to a load via a three-wire transmission
line. The per-phase impedance of the delta-connected load is 30 +
120j (2. The impedance of each wire of the transmission line is 2 +
4j 2. How much power is dissipated by the load? By the transmission
line? What is the power factor of the load? What is the overall
power factor?

A balanced three-phase delta-connected load is connected to a
balanced three-phase delta-connected source via a transmission
line. The line-line voltage for the source is 100∟0° V/phase and
the impedance of load is (27 + j18) Ω/phase. The transmission line
has an impedance of (1 + j4) Ω/line.
a) Draw the complete schematic of the power system showing the
location of wattmeters. (Two-Wattmeter system is considered for
this problem). Phase “a” could be considered as a reference
phase.
b) What must...

A balanced positive-sequence wye-connected 60-Hz three-phase
source has line-to-line voltages of VL = 440 V
rms. This source is connected to a balanced wye-connected load.
Each phase of the load consists of a 0.5-H inductance in series
with a 50-? resistance. Assume that the phase of
Van is zero.
A) Find the line-to-neutral voltage phasor
Van.
Enter your answer using polar notation. Express argument in
degrees.
B) Find the line-to-neutral voltage phasor
Vbn.
Enter your answer using polar notation. Express...

A three-phase, 460-V,
60-Hz, six-pole Y-connected
induction motor has Rs = 0.32
Ω, R′ r = 0.18 Ω, Xs = 1.04 Ω, X′ r = 1.6 Ω,
and Xm = 18.8 Ω. The
no-load loss, Pno load,
is negligible. The
load torque, which
is proportional to
speed squared, is 180
N#m at 1180 rpm.
If the motor speed
is 850 rpm,
determine (a) the
load torque demand TL;
(b) the rotor
current I′ r; (c) the
stator supply voltage Va;...

A 3 phase 460 V, 60 Hz, 4 pole, delta connected induction motor
has the following equivalent circuit parameters. Rs = 0.42 Ω, Rr =
0.23 Ω, Xs = Xr = 0.82 Ω. Xm = 22 Ω. The no load loss = 60 W and
may be assumed constant. The rotor speed is 1750 rpm. Use the
approximate equivalent circuit ( i.e. the Xm branch is at the very
left of the circuit) determine the following
a. the synchronous speed...

Q5
A 3-phase, 60 Hz, 500 V, delta connected motor develops
mechanical output of 250 H.P., the power factor being 0·7 lagging
(without capacitors) and motor efficiency 88%. A bank of series
capacitors is connected in delta across the supply terminals. Two
similar capacitors connected in series exist in each phase. Each of
these capacitors is rated at 250 V, 800 µF. What is the new power
factor of the motor after connecting the capacitor bank, also find
out saving...

The controlled full wave rectifier is connected to the grid. The
rms grid voltage is 230 Volt at 50 Hz. 24 Volt battery will be
charged with 15A. An inductor, which is series connected to the
battery, is used to limit the current ripple. Only The second
harmonics of the output voltage is taken into account. The inductor
R/L ratio is 50. The current ripple is allowed to be 4 amp peak to
peak. Determine the firing angle and R...

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