Refractory Personnel - API-936 Exam Practice Test

Question 1

Size distribution of aggregate particles is determined by:

A. porosity.

B. screen analysis.

C. expansion allowance.

D. rebound.

Correct Answer: B

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Question 2

Before application of a curing compound the hydraulic bond castable surface shall not be allowed to air dry longer than:

A. 8 hours.

B. 2 hours.

C. 24 hours.

D. 1 hour.

Correct Answer: D

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Question 3

The contractor on a field vibration casting job is preparing for a continuous pour that will last for three 12- hour shifts. The weather report predicts a nighttime low temperature of 35°F (2°C). How should the contractor be prepared?

A. Have the castable dry mix heated to >50°F (10°C)

B. Keep the install material and shell >50°F (10°C)

C. Be ready to stop pouring if the temperature drops below 35°F (2°C)

D. Make no special preparations

Correct Answer: B

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Question 4

The maximum angle permitted for gunning below the horizontal is:

A. 60°.

B. 30°.

C. 45°.

D. 15°.

Correct Answer: B

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Question 5

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

A. One

B. Four

C. Three

D. Two

Correct Answer: D

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Question 6

Who is responsible to approve refractory dryout procedures that have more than one heat source?

A. Owner

B. Manufacturer

C. Inspector

D. Contractor

Correct Answer: A

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Question 7

When water is used for refractory installed on a carbon steel surface with a stainless steel anchorage, the chloride content of the potable water shall not exceed:

A. 200 ppm

B. 100 ppm

C. 50 ppm

D. 250 ppm

Correct Answer: C

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Question 8

For linings that use a surface layer of refractory plastic or a ramming mix, when should trimming, jointing, and venting be done?

A. Never; these steps are not required when refractory plastics or ramming mixes are used

B. After the entire installation is complete

C. Before stopping work for the day or shift

D. After water curing for 24 hours

Correct Answer: C

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Question 9

Which of the following statements regarding curing of hydraulic bonded castables is true?

A. Apply a manufacturer approved membrane-type curing compound before the surface is dry to the touch

B. The membrane curing compound shall burn off at a temperature not less than 500°F (260°C)

C. After remaining in place for 24 hours, forms shall be removed and a curing compound applied within 1 hour of form removal

D. No part of the lining shall be allowed to air dry more than 3 hours before application of a curing compound

Correct Answer: D

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API Refractory Personnel - API-936 Exam Practice Test

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