api api-936 practice test

Refractory Personnel

Last exam update: Nov 18 ,2025
Page 1 out of 6. Viewing questions 1-15 out of 85

Question 1

[Material Requirements]
Which of the following is false per the requirements of API Standard 936?

  • A. Cold crush strength is determined using two 4-1/2 in. (144 mm) × 4-1/2 in. (114 mm) × 4-1/2 in. (114 mm) cubes.
  • B. Density shall be determined using cubes or erosion plates and linear change bars.
  • C. Abrasion resistance is determined using two 4-1/2 in. (114 mm) × 4-1/2 in. (144 mm) × 1 in. (25 mm) specimens.
  • D. Permanent linear change is determined with one 2 in. (50 mm) × 2 in. (50 mm) × 9 in. (230 mm) specimen.
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Answer:

A

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Question 2

[Installation Procedures]
The mock-up for vibration cast installations demonstrates the adequacy of the: (This may have more
than one correct answer; please select all that apply.)

  • A. craftsman's ability to construct the forms.
  • B. equipment.
  • C. means of vibrator attachment.
  • D. vibration method.
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Answer:

B,C,D

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Question 3

[Terms, Definitions, and Abbreviations]
Materials that are easily reduced to a granular or powdery condition after placement are known as:

  • A. friable materials.
  • B. calcined frits.
  • C. mineral additives.
  • D. granular grog.
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Answer:

A

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Question 4

[Responsibilities and Qualifications]
Conflicts in documents and/or drawings shall be resolved by the:

  • A. inspector.
  • B. owner.
  • C. engineering company.
  • D. inspector with 30 years of service/experience.
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Answer:

B

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Question 5

[Terms, Definitions, and Abbreviations]
The vessel in which the cracking reaction occurs or is completed, and in which the product gases are
separated from coke and/or catalyst particulate, is the:

  • A. stripper.
  • B. reactor.
  • C. regenerator.
  • D. stand pipe.
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Answer:

B

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Question 6

[Material Requirements]
Each sample tested in accordance with ASTM C181 for workability index shall consist of how many
specimens?

  • A. 1
  • B. 2
  • C. 3
  • D. 5
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Answer:

C

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Question 7

[Responsibilities and Qualifications]
Surface preparation and welding procedures are the responsibility of the:

  • A. Owner.
  • B. Contractor.
  • C. Inspector.
  • D. Manufacturer.
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Answer:

B

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Question 8

[Terms, Definitions, and Abbreviations]
Which of the following is the term for aggregate and/or cement that bounces away from a surface
against which refractory is being projected by gunning?

  • A. Slurry
  • B. Trimmings
  • C. Rebound
  • D. Overspray
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Answer:

C

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Question 9

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

  • A. Contractor
  • B. Owner
  • C. Manufacturer
  • D. Inspector
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Answer:

B

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Question 10

[Installation Procedures]
During gunning, inclusion of rebound is minimized by which of the following techniques?

  • A. Begin gunning at the lowest level and work around to full thickness in a spiral pattern
  • B. Start at the lowest level elevation and build up gradually to full thickness in complete rings
  • C. Start at the lowest level and build up gradually to full thickness in an area not more than 10 ft² (1 m²)
  • D. Cover all areas up to 1/2-in (13 mm) thick stud tip thickness before building to full thickness
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Answer:

C

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Question 11

[Inspection and Testing Requirements]
Which of the following is the appropriate term for testing refractory that was sampled during project
site installation in order to confirm that it meets specified physical property standards?

  • A. Hammer testing
  • B. Pre-qualification testing
  • C. As-installed testing
  • D. Visual testing
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Answer:

C

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Question 12

[Material Requirements]
The quantity of manufactured refractory that has the same formulation as that prepared in an
uninterrupted manufacturing operation is called a:

  • A. pallet
  • B. test sample
  • C. production run
  • D. bag
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Answer:

C

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Question 13

[Inspection and Testing Requirements]
Which of the following is a quality control element?
(This may have more than one correct answer; please select all answers that apply.)

  • A. As-installed testing
  • B. Initial Inspection
  • C. Installation monitoring
  • D. Report writing
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Answer:

A,B,C

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Question 14

[Installation Procedures]
If the refractory lining is required before pressure testing, all pressure-retaining welds shall:

  • A. be lined with coal tar epoxy.
  • B. include additional anchors.
  • C. remain unlined and exposed to test medium.
  • D. be gunned with no needles.
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Answer:

C

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Question 15

[Material Requirements]
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. 50 ppm
  • B. 100 ppm
  • C. 200 ppm
  • D. 250 ppm
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Answer:

A

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