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Question 1

Spalling of layers from the hot surface of a refractory lining is called

Options :

A : spalling

B : sheeting

C : crumbling

D : erosion

Answer: B

Question 2

Which of the following conditions must be met for test results from trial mixes of low cement castables to be accepted for qualification?

Options :

A : The water content must not vary more than ±1.0% from that recommended by the manufacturer.

B : Specimens must be fired at 1500°F (815°C) and held for a minimum of 3 hours.

C : Bulk density and CCS must exceed average values published in ASTM C401.

D : The drying process must be conducted at 220°F (104°C) for at least 48 hours before firing.

Answer: A

Question 3

How many specimens per sample are required for testing by ASTM C-704?

Options :

A : One

B : Two

C : Three

D : Four

Answer: B

Question 4

The colour of stripe for 304L alloy material of metallic anchor is

Options :

A : 1 solid black

B : 2 solid black

C : 1 solid grey

D : None of the above

Answer: B

Question 5

To compose a sample for CCS test from an equivalent number of refractory shapes the specimen should be

Options :

A : at least five

B : at least three

C : at least four

D : None of the above

Answer: A