api API-936 Exam Questions

Questions for the API-936 were updated on : Nov 21 ,2025

Page 1 out of 6. Viewing questions 1-15 out of 85

Question 1

[Acceptance Criteria]
Which of the following is a valid acceptance criterion for cold crushing strength of castable used in
erosive service?

  • A. CCS must be no less than 80% of the manufacturer’s advertised maximum.
  • B. CCS test values must average within ±10% of the manufacturer’s mean value.
  • C. All individual values must exceed 75% of the manufacturer’s minimum published CCS.
  • D. The lowest result must exceed 90% of ASTM C401 average for gunned materials.
Answer:

C

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Question 2

[Curing and Dryout]
In accordance with TR 980, when curing a high-purity, low-cement castable for a high-temperature
unit, which of the following sequences ensures minimum cracking risk?

  • A. Steam curing for 48 hours followed by firing at 1500°F
  • B. Air curing for 24 hours, followed by controlled heating ramp of 50°F/h up to 600°F
  • C. Accelerated drying using forced air at 400°F for 12 hours
  • D. Dryout using open flame burners after form removal
Answer:

B

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Question 3

[Inspection and Testing Requirements]
Which of the following is a correct condition for gunned material test panels used for CCS and PLC
testing?

  • A. Test panels must be 24 in. × 24 in. × 6 in. thick and shot vertically.
  • B. The minimum gunned thickness shall be 2 in., with a tolerance of ±0.25 in.
  • C. A vibrating screed must be used during panel finishing.
  • D. Test panels must be dried at 400°F (204°C) for 6 hours before specimen extraction.
Answer:

B

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Question 4

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

  • 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

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Question 5

[Inspection and Testing Requirements]
Abrasion resistance of a material is reported as loss of:

  • A. density.
  • B. mass.
  • C. volume.
  • D. area.
Answer:

C

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Question 6

[Material Requirements]
The best definition for creep is:

  • A. deformation due to continuous load over time.
  • B. an increase in expansion at high temperatures.
  • C. shrinkage at high temperatures.
  • D. cracking caused by thermal shock.
Answer:

A

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Question 7

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

  • A. 1 hour.
  • B. 2 hours.
  • C. 8 hours.
  • D. 24 hours.
Answer:

A

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Question 8

[Inspection and Testing Requirements]
What abrading media is required in the ASTM C-704 abrasion-resistant test?

  • A. Alumina grit
  • B. Silicon nitride
  • C. Silicon carbide
  • D. FCCU catalyst
Answer:

C

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Question 9

[Inspection and Testing Requirements]
What is the ASTM test designation for cold crush strength?

  • A. C-417
  • B. C-704
  • C. C-113
  • D. C-133
Answer:

D

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Question 10

[Installation Procedures]
Which party or individual is responsible for submitting a dryout procedure for a new lining?

  • A. Contractor
  • B. Inspection company
  • C. Refractory manufacturer
  • D. Dry-out company
Answer:

A

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Question 11

[Inspection and Testing Requirements]
For as-installed testing in casting applications, what is the minimum number of cast samples required
by each mixing crew per material per shift?

  • A. One
  • B. Two
  • C. Three
  • D. Four
Answer:

B

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Question 12

[Responsibilities and Qualifications]
Which of the following is the inspector responsible for?

  • A. Hammer testing newly installed linings
  • B. Providing compliance data sheets
  • C. Testing water to be used
  • D. Qualification testing
Answer:

A

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Question 13

[Responsibilities and Qualifications]
The installation contractor is required to secure an advance agreement that concerns all the
installation details from the:

  • A. Engineering company.
  • B. Inspector.
  • C. Owner.
  • D. Manufacturer.
Answer:

C

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Question 14

[Installation Procedures]
If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining
shall be:

  • A. cut back within 1 hour.
  • B. cut back within 30 minutes.
  • C. immediately cut back to the shell between anchors.
  • D. cut back to the shell in a straight line.
Answer:

C

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Question 15

[Inspection and Testing Requirements]
A change in the length of a specimen measured before and after heating to a specific temperature is
referred to as:

  • A. Modulus of rupture.
  • B. Permanent linear change.
  • C. Modulus of elasticity.
  • D. Pyrometric cone equivalent.
Answer:

B

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