Question

The expression 0.01E+0.003E^2 the thickness in millimeters (mm) of the insulation needed for a high voltage cable.E is the number of kilovolts carried by the cable. What thickness of insulation material is needed for 7 kilovolt cable?

a)0.091mm
b)1.54mm
c)0.217mm
d)0.847mm

Answer 1

Putting 7 into E in the equation for thickness:
Thickness = 0.01(7) + 0.003(7)²
= 0.217 mm
The answer is C.

Answer 2

Answer: The correct answer is option (c).

Step-by-step explanation:

The thickness of the insulation needed for a wire with voltage E, th expression is given as:

`0.01E+0.003E^2 mm`

The thickness of the insulation required for the 7 kilovolts : E=7 kilovolts

`0.01(7)+0.003(7)^2=0.217 mm`

0.217 mm thickness of insulation material is needed for 7 kilovolt cable.

Hence, the correct option is (c).