Question

1.In a ∆ − ? system, a phase voltage of 120 V produces a line voltage of:

a. 207.8460 V

b. 120 V

c. 110 V

d. 141 V

Answer #1

A wye connected three-phase source is delivering a line voltage
of 480 V at a line current of 25 amperes.
Find
a) the phase voltage
b) the phase current
c) the line voltage
d) the line current
e) the total power delivered.

The magnitude of the phase voltage of an ideal balanced
three-phase Y-connected source is 110 V . The source is connected
to a balanced Y-connected load by a distribution line that has an
impedance of 0.1+0.8i Ω/ϕ . The load impedance is 20.2+14.8i Ω/ϕ .
The phase sequence of the source is acb. Use the a-phase voltage of
the source as the reference.
Part A: Specify the magnitude and phase angle of the line
current IaA.
Part B: Specify the...

A balanced three-phase Y-? system has Vab = 380
V rms and Z?=? If the line
impedance per phase is (0.1 + j0.4)? and total complex power
delivered to the load (8+7j)KVA
a) find line current
b) find the voltage load
c) find the current load
d) find Z?
f) simulation for this circuit on the
MULTISIM

A three phase balanced resistive load has a line voltage VL =
381.05 V and line current IL = 30 A. Calculate 1) the total power
taken by the load 2) the power taken by each phase of the load.

Calculate the sequence components of line to line
voltage of 380 V balanced system.

Given the data:
Accelerating voltage = 120 V
Deflecting voltage = 32 V
Deflection = 2.4 cm
What will the deflection of an electron beam in a cathode ray
tube be changed to if the accelerating voltage is increased to 480
V and the deflecting voltage remains at 32 V?

A 3- phase, 2 pole Y-connected synchronous machines has a
line-line voltage of 6,000V in 60Hz power line, has an armature
reactance of 2ohms/ phase and negligible armature resistance.
Compute the following
A) In case of generating action if the line current is 385 A at
a leading power factor of 0.8, the armature voltage per phase is
3464V, Compute the voltage per phase and power angle.
B) Draw the phasor diagram.
C) If the losses in the machine is...

Three single phase transformers having a 15:1 ratio are
wye-connected to a 2400 V three phase line as a step-down
transformer. What is the line voltage of each transformer? What is
the secondary voltage of each transformer if they are delta
connected to the same line?

The no-load (line) voltage of a 6-pole, 72-slot, 1200-rpm,
three-phase, Y-connected, synchronous generator is 1732 V. There
are 10 conductors per slot. For a series connection, determine (a)
the frequency of the induced emf and (b) the flux per pole.

1- A 69-kV, three-phase short transmission
line is 16 km long. The line has a per
phase series impedance of 0.125 +
j0.4375 ohm per km. Determine the sending
end voltage, voltage regulation, the
sending end power, and the transmission
efficiency when the line delivers
a. 70 MVA, 0.8 lagging power factor at 64 kV
b. 120 MW, unity power factor at 64 kV
2-three-phase, completely transposed 345-kV, 200 km
line has two 795,000-
cmil 26/2 ACSR conductor per bundle...

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