Quiz questions Flashcards
Hydro provides a 3 wire service to your house, what colour of wires would they be? Also , what would they be called and which wire is grounding to earth?
Black , White , Red
L1 , Neutral , L2
White
What happens to loads if a balanced circuits neutral becomes open?
Nothing changes
What happens to the loads of an unbalanced circuit neutral becomes open?
The voltage changes
Solid wire is normal found in smaller wires of what size?
No. 8 and smaller
Why is stranded wire used in large wires?
More flexibility
Name 3 types of stranding wire?
bunched, concentric, and rope stranded
The amount of voltage a wire will withstand before breaking down is a measurement of its?
Dielectric strength
What is dialectric strength?
the amount of voltage a wire will withstand before breaking down
What is the purpose of insulating conductors?
To prevent unwanted current flow
What colours in a 4 conductor cable?
Red, White, Blue, Green, Black
How to recognize cross-link insulation?
It is marked XLPE or XPE
The amount of stress a wire will withstand before breaking down is a measurement of its?
ultimate strength
Extra low voltages operate at _________ or less?
30v
If two wires have the same length and same cross-sectional area, but one is copper and the other is aluminum, which has the lower resistance?
They remain the same
How would the resistance of a copper wire be affected if it’s:
a) length were doubled
b) cross sectional area were doubled
c) length and cross-sectional area were doubled
a) resistance would double
b) resistance cut in half
c) remains the same
