Question 1

According to API 936, test specimens are required to be held at oven dry temperature for how many hours?

Options :

A : 1

B : 3

C : 5

D : 12

Answer: D

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

The application of monolithic refractories by means of air placement guns is

Options :

A : gunning

B : placing

C : pouring

D : casting

Answer: A

Question 4

Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:

Options :

A : air cured, covered.

B : heat cured, uncovered.

C : air cured, uncovered.

D : heat cured, covered.

Answer: C

Question 5

The most commonly used binder for refractory concrete is

Options :

A : calcium aluminate cement

B : cements

C : silicates

D : all of the above

Answer: A

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