411_HW5B
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School
University of Texas *
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Course
411
Subject
Electrical Engineering
Date
Feb 20, 2024
Type
Pages
9
Uploaded by DoctorRhinoceros2814
1.
Award: 3.12 points
3.12 points
2.
Award: 3.12 points
3.12 points
An ac motor with impedance
Z
L
= (5.6 + j
2.40) Ω
is supplied by an RMS value of 220-V, 60-Hz source.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this
part.
References
References
Section Break
Section Break
Di
ffi
culty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Find the power factor, the average power, and the reactive power. The power factor of the given ac motor is .
The average power of the given ac motor is kW.
The reactive power of the given ac motor is kVAR.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
3.
Award: 3.12 points
3.12 points
Determine the capacitor required to be connected in parallel with the motor so that the power
factor is corrected to unity. The required value of the capacitor is μ
F.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
A 110-V rms, 60-Hz source is applied to a load impedance Z
. The apparent power entering the load is
120 VA at a power factor of 0.707 lagging. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this
part.
References
References
Section Break
Section Break
Di
ffi
culty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Calculate the complex power.
The complex power is + j
VA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
4.
Award: 3.12 points
3.12 points
5.
Award: 3.12 points
3.12 points
6.
Award: 3.12 points
3.12 points
Find the rms current supplied to the load. The rms current supplied to the load is A rms.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Determine the value of impedance Z
. The value of Z = + j
Ω
.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Assuming that , find the values of R
and L
. (Round the final answer to two decimal
places.)
Z
=
R
+
j
L
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7.
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The values of R
and L
are Ω
and mH, respectively.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
If P
= 269 W and Q
= 165 VAR (capacitive), find the complex power. The complex power is (
– j
) VA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Given that Q
= 2050 VAR and pf = 0.9 (leading), find the complex power.
The complex power is – j
kVA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
9.
Award: 3.12 points
3.12 points
10.
Award: 3.12 points
3.12 points
11.
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3.12 points
Determine the complex power if S
= 600 VA and Q
= 525 VAR (inductive).
The complex power is (
+ j
) VA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
Determine the complex power for the following: V
rms
= 220 V, P
= 0.6 kW, |
Z
| = 40 Ω
(inductive)
The complex power is (
+ j
) kVA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
For the network in the figure, find the complex power absorbed by each element. Take V
s
= 11
∠
−
20° V rms.
The complex power supplied by the source is + j
(
) VA.
The complex power absorbed by the capacitor is −
j
(
) VA.
The power absorbed by the resistor is W.
The complex power absorbed by the inductor is j
(
) VA.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand apparent
power (complex power), power, and
reactive power and power factor.
A voltage source of 436 Vrms, 60Hz is supplied to the given circuit.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this
part.
References
References
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12.
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13.
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14.
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3.12 points
Section Break
Section Break
Di
ffi
culty: Medium
Learning Objective: Understand power
factor correction and the importance of its
use.
What is the power factor? The power factor is .
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand power
factor correction and the importance of
its use.
What is the average power dissipated? The average power dissipated is kW.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand power
factor correction and the importance of
its use.
15.
Award: 3.12 points
3.12 points
What is the value of the capacitance that will give a unity power factor when connected to the
load? The value of the capacitance that will give a unity power factor when connected to the load is μ
F.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand power
factor correction and the importance of
its use.
Two loads connected in parallel draw a total of 2.4 kW at 0.8 lagging pf from 130-Vrms, 60-Hz line.
One load absorbs 1.5 kW at a 0.707 lagging pf.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this
part.
References
References
Section Break
Section Break
Di
ffi
culty: Medium
Learning Objective: Understand power
factor correction and the importance of its
use.
Determine the pf of the second load. The pf of the second load is .
References
16.
Award: 3.20 points
3.20 points
Numeric
Response
Difficulty: Medium
Learning Objective: Understand power
factor correction and the importance of
its use.
Determine the parallel element required to correct the pf to 0.9 lagging for the two loads. The parallel element required to correct the pf to 0.9 lagging for the two loads is μ
F.
References
Numeric
Response
Difficulty: Medium
Learning Objective: Understand power
factor correction and the importance of
its use.
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