PHEP Chapter 1

Question 1

What is a molecule

Answer 1

unlike atoms bound chemically

Question 2

water is a …

Answer 2

compound

Question 3

What is air composed of

Answer 3

21% oxygen 79% nitrogen

Question 4

pressure at sea level?

Answer 4

14.7 psi

Question 5

when are the molecules of matter costly bound together

Answer 5

solid state

Question 6

What do liquids do

Answer 6

offer high resistance to force tending to change their volume

Question 7

what happens to a substance as its temperature increases

Answer 7

expands and becomes less dense

Question 8

what happens to a substance as pressure is reduced

Answer 8

it expands and becomes less dense

Question 9

when is specific gravity useful

Answer 9

in find weight of objects that cannot be weighed on scales

Question 10

how do we calculate absolute pressure

Answer 10

4.91 psi + 14.7 psi

Question 11

what is needed to move liquid through a siphon

Answer 11

force of static head and friction head

Question 12

what are the units of magnetic lines of flux

Answer 12

maxwells

Question 13

how is the direction of conductor motion reversed?

Answer 13

by reversed polarity of magnetism or a reversed current flow in the conductor

Question 14

when is a piece of iron saturated

Answer 14

it cannot hold any more flux regardless of how many ampere turns used

Question 15

what is permeability the reciprocol of

Answer 15

reluctivity

Question 16

what can produce cutting of magnetic flux lines

Answer 16

movement of flux, movement of conductor, change in current