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Unit 122/124 Scratch/Floating Coats

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

Which one of the following is applied to an internal wall to even out suction?

a)

Dubbing out.

b)

Setting coat.

c)

Pricking up coat.

d)

Scratch coat.

2.

Which one of the following materials improves workability of a mix for scratch coats?

a)

Lime.

b)

Sand.

c)

Cement.

d)

Retarder.

3.

Which one of the following is a general purpose cement for a scratch coat?

a)

High alumina cement.

b)

White portland cement.

c)

Blended cement.

d)

Ordinary portland cement.

4.

Which of the following is the generally preferred sand:cement mix used for a scratch coat?

a)

1:1

b)

2:1

c)

4:1

d)

6:1

5.

Which one of the following tools is required to form a hard angle on a return when applying scratch coats?

a)

Gauging trowel.

b)

Plastic float.

c)

Comb scratcher.

d)

Feather edge.

6.

What is the tool is used to measure out powder?

a)

Bucket trowel.

b)

Pointing trowel.

c)

Gauging trowel.

d)

Angle trowel.

7.

The process called "scratch coat" is important because?

a)

forms a mechanical key

b)

controls the suction

c)

dubs out hollows

d)

slows down the set.

8.

What is the main reason for using a brush to apply a slurry adhesive?

a)

Consistent coverage.

b)

Reduced waste.

c)

Improved appearance.

d)

Modern method.

9.

In bonding grade plaster, the aggregate is

a)

sand

b)

cement

c)

lime

d)

vermiculite.

10.

Which of the following lightweight undercoat plasters provides the best impact resistance?

a)

Browning.

b)

Bonding.

c)

Hardwall.

d)

Renovating.

11.

When floating, at what ratio should a traditional lime based plaster be mixed?

a)

3:2

b)

4:1

c)

5:1

d)

5:2

12.

Which one of the following tools transports the material from the spot board to the wall?

a)

Hawk.

b)

Gauger.

c)

Bucket trowel.

d)

Plasterer’s trowel.

13.

Which one of the following tools is used to provide a key?

a)

Darby.

b)

Float.

c)

Devil float.

d)

Finishing trowel.

14.

Which one of the following should be used to rule a wall straight during the floating coat process?

a)

Float.

b)

Flat brush.

c)

Spirit level.

d)

Feather edge.

15.

It is important to keep tools and equipment clean to prevent contamination of the

a)

mix

b)

air

c)

water supply

d)

work area.

16.

What is identified by checking a wall with a straight edge before applying a floating coat?

a)

Suction.

b)

Key.

c)

Gauls.

d)

High points.

17.

Before applying the scratch coat, which one of the following should be applied to a stone surface with hollows in?

a)

Dubbing out.

b)

Splatter dash.

c)

Bonding coat.

d)

Stipple coat.

18.

The process used to ensure accuracy when applying a floating coat is

a)

broad screed

b)

box screed

c)

dot and screed

d)

free hand.

19.

The process used to ensure speed and straightness when floating is

a)

dot and screed

b)

broad screed

c)

reverse rule

d)

scratch coat.

20.

When making good a chase with a low suction background, which type of pre-mixed plaster should be used?

a)

Bonding.

b)

Casting.

c)

Finishing.

d)

Browning.