Drafting

Question 1

Perfect vacuum, max height

Answer 1

33.9 feet

Question 2

Practical limit of draft

Answer 2

22 2/3 feet

Question 3

Water will rise ___ for each pound of pressure removed from the pump.

Answer 3

2.304 feet

Question 4

Weight of one cubic inch of mercury is

Answer 4

.49 psi

Question 5

Hg needed =

Answer 5

.885(height)

Question 6

Atmospheric pressures reduced approx ____ for each ___ of elevation above sea level.

Answer 6

1/2 pound / 100

Question 7

Elevation above sea level = Loss of lift

1000 feet =

Answer 7

1.22 feet

Question 8

Elevation above sea level = Loss of lift

2000 feet =

Answer 8

2.38 feet

Question 9

Elevation above sea level = Loss of lift

3000 feet =

Answer 9

3.50 feet

Question 10

Elevation above sea level = Loss of lift

4000 feet =

Answer 10

4.75 feet

Question 11

Elevation above sea level = Loss of lift

5000 feet =

Answer 11

5.80 feet

Question 12

Elevation above sea level = Loss of lift

6000 feet =

Answer 12

6.80 feet

Question 13

Elevation above sea level = Loss of lift

7000 feet =

Answer 13

7.70 feet

Question 14

Power generated by internal combustion engines decreases about ____ for each 1000 feet of elevation.

Answer 14

3 1/2%

Question 15

An engine which was just adequate at sea level would be about ___ deficient at ____ altitude.

Answer 15

25% / 7000 ft

Question 16

Rainy weather is accompanied by a ____

Answer 16

reduction of atmospheric pressure

Question 17

A __ should be used at the bottom, next to the strainer, hitch must be separated, so as to be placed on both sides of the male coupling lugs

Answer 17

clove hitch

Question 18

With the other end of the rope, tie a ____ on the first coupling above the strainer end, when removing the suction from the water, pull on the rope attached to first coupling above the strainer.

Answer 18

running bowline

Question 19

Pumps are rated at capacity using a ____ and a lift of ___.

Answer 19

6” suction / 10 feet

Question 20

None of our pumps are able to deliver rated rapacity when suction lift exceeds ___ and a single ____ is used.

Answer 20

8 feet / 4” suction hose

Question 21

The restriction imposed on capacity by the 4” suction hose can be partially offset by using ____ .

Answer 21

two sets of 4” hard suctions.

Question 22

Two sets of 4” suction are equivalent to a _____.

Answer 22

single suction of 5.6 inches.

Question 23

Transfer valve should be in ____ because the air will be evacuated from the pump quicker and more completely.

Answer 23

Volume

Question 24

At draft maintain approximately ___ discharge pressure to avoid losing prime.

Answer 24

35 psi

Question 25

When water is subject to reduced pressure, the boiling point is lowered. If water is too warm (over ____), sufficient air and water vapor may be given off to affect the maximum capacity of the pump.

Answer 25

85º F

Question 26

Dry Vacuum Test: This should be at least ___ of vacuum.

Answer 26

20” of vacuum

Question 27

Dry Vacuum Test:

Should not drop more than ____ in ____.

Answer 27

10” Hg in 5 minutes.

Question 28

Securing Hard Suctions :
Clove hitch at ____ next to strainer; hitch separated to be on both side of male coupling lugs of suction. With the OTHER end of the rope, tie a ____ on the first coupling above the strainer. Secure center of rope to apparatus or any convenient place on the wharf.

Answer 28

bottom / bowline

Question 29

In most cases, ____ will not be sufficient to reach the water supply.

Answer 29

one 10’ length of suction hose

Question 30

_____ should normally be considered as minimum and in many cases it will be necessary to use ___.

Answer 30

Two 10’ lengths / three lengths

Question 31

The suction strainer will be submerged at least ___ below the level of the water.

Answer 31

Two feet

Question 32

The water should be at least ___ deep where the strainer is located to provide clearance below and sufficient depth above it.

Answer 32

Four feet