Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #3
SOLUTIONS
1.
2.
(a)
(b)
3.
4.
In a purely inductive circuit, the current lags the voltage by
90. If the voltage is at 45, then 45- 90 = -45. j
5.
In a purely inductive circuit, the current always lags th

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #8
1.
A transformer is to be built that will step-up a 120V, 60Hz input to a 500V, 60Hz
output. The iron core chosen to be used will become saturated with a flux of
0.0255Wb.
(a)
(b)
(c)
2.
A 2.7kV#

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #7
1.
A lighting load operates from a 208V, 60Hz supply and is rated 1kW @ p.f.=0.707
lagging. Calculate:
(a)
Line current.
(b)
Size of the parallel capacitor to raise the power facto

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #1
1.
During an Electrotech Lab, Channel A
of the scope has the waveform
shown. If the settings on the scope
are:
Sweep Time/Div = 50s
Ch-A Volts/Div = 10V
Determine:
(a)
VPP (VPP = 60V).
(b)

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #6
1.
For the RLC series circuit shown:
(a)
(b)
(c)
2.
The following circuit is connected to a
function generator. Make the appropriate
calculations and sketch the phasor
diagram, if:

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #5
CAPACITORS IN DC CIRCUITS:
1.
A 300 pF capacitor is to be constructed with 1.1 cm x 2.1 cm plates and a dielectric
with k = 76. How much separation should be between the plates?
2.

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #4
1.
Determine the real and reactive power of a 2H ideal inductor drawing 400mA from
a 60Hz power supply.
2.
Determine the real, apparent and reactive powers
dissipated by the circui

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #2
1.
Represent the following three waveforms on a single phasor diagram. (Use the
current as the reference phasor).
2.
Convert the phasor diagram shown into instantaneous
equations.

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #5
SOLUTIONS
1.
2.
3.
4.
ELTK1200
Marine Institute
Rev 2
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5.
6.
(a)
(b)
This is the total charge across the entire circuit.
(c)
7.
ELTK1200
Marine Institute
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8.
(a)
(b)
(c)
Phasor diagram
(d)
ti

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #8
SOLUTIONS
1.
(a)
(b)
(c)
2.
(a)
(b)
(c)
3.
(a)
Full-load:
This has not changed.
ELTK1200
Marine Institute
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(b)
a Full-load
Load is a of Full-load, j current will be a of Full-load current (volta

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #7
SOLUTIONS
1.
(a)
or
(b)
or
New pf is still lagging, so
.
(c)
ELTK1200
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2.
(a)
If pf = 1, then QC = QL, QNET = 0 and S2 = P.
(b)
QL will be the same as part (a).
New pf is still

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #4
SOLUTIONS
1.
Ideal inductor with no resistance, so real power
P = 0.
2.
I has an angle of 0 and VS has an angle of 30. So the phase angle must be 30
lagging. This means that Z must be made up of a resist

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #1
SOLUTIONS
1.
(a)
From Scope:
(b)
(c)
or
(d)
From Scope:
(e)
(f)
(g)
(h)
time
radians
(i)
no time
degrees
(j)
time
radians
(k)
no time
degrees
ELTK1200
Marine Institute
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2.
(a)
(b)
(c)
(d)
time
(

Assignment
ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #2
SOLUTIONS
1.
Note: Phasors
are typically RMS quantities, but peak values
can be used
if it simplifies calculations and it is clearly indicated on documentation. But make
sure your answer is in the form a

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ELECTROTECHNOLOGY
ELTK1200
ASSIGNMENT #3
1.
Determine the inductive reactance of a 5.5 mH choke at 25 kHz.
2.
(a)
(b)
3.
When an inductor is connected to a 24V, 60 Hz supply, a current of 40 mA flows.
Determine the induct