
DC CIRCUIT: BASIC PRINCIPLES

Quiz
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Other
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University
•
Easy
Arthur Leywin
Used 1+ times
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22 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The substation bus bar is made up of 2 inches round copper bars 20 ft long. What is the resistance of each bar if resistivity is 1.724 x 10-6 ohm-cm.
7.21 x 10-5 Ω
13.8 x 10-6 Ω
5.185 x 10-5 Ω
2.96 x 10-5 Ω
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Determine the resistance of a busbar made of copper if the length is 10 meters long and the cross section is a 4 x 4 cm2 . Use 1.7241 micro ohm-cm as the resistivity.
2.121 x 10-4 Ω
4.312 x 10-4 Ω
3.431 x 10-5 Ω
1.078 x 10-4 Ω
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A copper wire of unknown length has a resistance of 0.80 ohm. By successive passes through drawing dies, the length of the wire is increased by 2 ½ times its original value. Assuming that resistivity remains unchanged during the drawing process, determine the new value of its resistance.
4 ohms
3 ohms
5 ohms
6 ohms
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A one-meter rod of 2-cm diameter is drawn until its resistance is 100 times the initial resistance. Its length afterwards is?
10m
100m
12.5m
5m
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the size in square millimeter (mm2 ) is the cable of 250 MCM size?
118.656 mm^2
126.675 mm^2
112.565 mm^2
132.348 mm^2
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The resistance of a copper wire at 30°C is 50 ohms. If the temperature coefficient of copper at 0°C is 0.00427, what is the resistance at 100°C?
72.26 ohms
54.25 ohms
63.24 ohms
58.15 ohms
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The resistance of a wire is 126.48 Ω at 100°C and 100 Ω at 30°C. Determine the temperature coefficient of copper at 0°C.
0.00427/°C
0.00423/°C
0.0256/°C
0.0258/°C
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