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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
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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
165
5.
6.
(a)
(b)
This is the total charge across the entire circuit.
(c)
7.
ELTK1200
Marine Institute
Rev 2
166
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
Rev 2
187
(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
Marine Institute
Rev 2
181
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
Rev 2
141
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
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
ELTK1100
ASSIGNMENT #5
1.
Design a series voltage divider to supply 75V drawing 100mA of current from a 125V
source.
2.
Design a voltage divider to supply 75V drawing 100mA of current from a 125V
source
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #8
1.
A coil consists of 300 turns and has a current of 200 mA flowing. What is the mmf?
2.
If the reluctance of a magnetic path is 225 * 105 A$t/Wb, what value of
magnetomotive force
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #3
1.
Calculate IT, I1, I2, I3, V1, V2 and V3 for the following circuit.
2.
For the following circuit, determine:
(a)
RT
(b)
IT
(c)
I2
(d)
I3
(e)
V5
ELTK1100
Marine Institut
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #4
1.
Find the Unknown Resistances.
2.
Find the Unknown Resistances.
3.
Find the Unknown Resistances.
ELTK1100
Marine Institute
Rev 3
143
4.
Find the Unknown Resistances.
5.
How much
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #6
1.
Find the resistance (@ 20(C) of the following wires;
(a)
(b)
(c)
(d)
2.
50000 ft. of copper 0.258" in diameter.
1.5 miles of #8 aluminum.
800 m of manganin 0.259 cm. in diameter
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #2
1.
What is the value of the following D.C. Milliammeter reading if the selector switch
is set on the following settings;
(a)
(b)
(c)
(d)
10
50
2.5
100
If this was an actual reading
Assignment
ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #4
(SOLUTIONS)
1.
Series circuit, so
P (W)
V (V)
I (A)
R ()
T
600
120
5
24 2
1
280
56
51
11.2 5
2
200
40
51
83
3
120
24
51
4.8 4
Alternatively:
KVL on loop
2.
R1 and R2 are parallel, so
ELTK1100
Marine Inst
Assignment
ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #2
SOLUTIONS
1.
(a)
(b)
(c)
(d)
2.76 mA.
13.8 mA.
0.69 mA.
27.6 mA.
Analog ammeter and voltmeter readings
are most accurate when the meter reading
has the largest deflection without going off scale (usually
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #7
1.
Calculate the unknown resistor values. What percentage of the source voltage is lost
to R1.
2.
The distance between a load and a source is 100 ft. The total resistance of the
co
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #1
1.
Name the six ways to generate EMF and provide an example for each way.
2.
What is the difference between the Negative Pole and the Positive Pole of a battery
( Two words )?
3.
Would two
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ELECTROTECHNOLOGY
ELTK1100
ASSIGNMENT #9
1.
A conductor 0.5 meters in length is passed at a speed of 25 m/sec. between two
pole pieces having a flux density of 0.5 Tesla. Calculate the Vind.
2.
A coil having 1000 turns draws 10A and has