Glencoe: 13

Question 1

Before using a stepladder

Answer 1

Always be certain the feet are firmly supported and the spreader is locked into position

Question 2

What is a spreader:

Answer 2

holds the ladder open and prevents it from closing accidentally.

Question 3

Steps to set up a straight ladder:

Answer 3

1. Brace lower end against step or object
2. Grasp rung at upper end with both hands
3. Lift the upper end and walk forward, grasping rungs as you proceed.
4. When ladder is erect, lean it forward
5. Check angle, height, and stability at top and bottom.

Question 4

Ladder should extend above roof:

Answer 4

3’

Question 5

Extension Ladder overlap amounts:
3’:
4’:
5’:

Answer 5

for total extended lengths up to 32’
for total lengths of 32’ to 35’
for total lengths of 36’ to 47’

Question 6

2 Ladder accessories for safety:

Answer 6

Ladder stabilizer, horizontal arms 4’ across at top.

Leg levelers can be attached to feet.

Question 7

Lifeline:

Answer 7

is a rope intended to prevent a worker from falling

Question 8

Lifelines must support minimum deadweight of Xlbs

Answer 8

5,400lbs

Question 9

Lifelines that are subject to abraision or cutting must be

Answer 9

wire core

Question 10

Lifelines must prevent a worker from falling no more than

Answer 10

6’

Question 11

Concrete:

Answer 11

material made by mixing cement, coarse aggregate, fine aggregate, and water.

Question 12

Hydration:

Answer 12

chemical reaction that occurs when water combines with cement. This reaction generates heat.

Question 13

Grout or Mortar:

Answer 13

if coarse aggregate is missing from concrete mix it is just grout or mortar.

Question 14

Concrete has tremendous:

Answer 14

Compression strength

Question 15

Concrete is X to chemicals

Answer 15

resistant

Question 16

Concrete hardens even:

Answer 16

underwater

Question 17

When concrete is properly cured it withstands:

Answer 17

extreme heat and cold

Question 18

Concrete can be formed:

Answer 18

into almost any shape

Question 19

Concrete is widely :

Answer 19

available and inexpensive

Question 20

What did cement variant did the Romans use?

Answer 20

Romans obtained natural cement from pumice, a mineral deposited on the slopes of volcanoes. When mixed with water it formed a hard durable substance.

Question 21

Cement used in modern concrete:

Answer 21

Portland cement.

Question 22

How is portland cement made:

Answer 22

Manufactured using heat.

Question 23

Why is it called portland cement

Answer 23

It got its name from being similar in color to portland stone.

Question 24

Types of portland cement:

Answer 24

1. Standard. Most general. Economical with long setting time
2. Modified. Most general. Less heat than 1, resists breaking down when exposed to sulfates
3. High strength, Used where forms must be removed quickly or concrete used quickly. Gains strength faster.
4. Low heat. Used for large projects
5. Sulfate-resistant. Used where exposed to high alkaline conditions.

Question 25

Portland cement ingredients:

Answer 25

Lime, silica, alumina