API-936 PDF Dumps 2026 Exam Questions with Practice Test
Dumps for Free API-936 Practice Exam Questions
API-936 certification program is an essential tool for individuals seeking to validate their knowledge and skills in the field of refractory materials. Refractory Personnel certification program provides a recognized standard for the industry and helps to ensure that certified personnel have the necessary skills and knowledge to perform their job duties effectively.
API-936 exam is a rigorous and challenging exam that requires a thorough understanding of refractory materials and their applications. API-936 exam consists of 120 multiple-choice questions, and candidates have four hours to complete the exam. To pass the exam, candidates must achieve a score of at least 70%.
API-936 (Refractory Personnel) Certification Exam is an internationally recognized certification exam that is designed for professionals who are involved in the installation, inspection, testing, and maintenance of refractory materials in various industries such as petrochemical, power generation, and steel production. The API 936 certification validates the proficiency of the refractory personnel in the application of refractory materials as per industry standards and best practices. Refractory Personnel certification exam is developed and conducted by the American Petroleum Institute (API) and is recognized worldwide.
NEW QUESTION # 47
Test results received from cast sample mock-ups will serve to qualify the:
Answer:
Explanation:
Explanation:
mixing time
mix water levels
installation procedures
According to API Std 936 and supporting guidance from TR 980, cast sample mock-ups are used during pre-installation trials to ensure the suitability and repeatability of installation variables such as mixing procedures and water content. These mock-ups are critical to confirm that the material can be properly installed under anticipated field conditions.
From API 936:
"Mock-up cast sample trials shall be used to demonstrate the adequacy of the mixing time, water addition (mix water levels), and installation procedures prior to production installation."
- API Std 936, Section 6.3.2
This ensures that full-scale application performance is achievable using the approved methods and materials. However:
The "quality of the inspection equipment" and
"fabricator of the mock-up"
are not part of the qualification objectives defined for cast sample testing.
Correct selections:
mixing time
mix water levels
installation procedures
NEW QUESTION # 48
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. Cover all areas up to 1/2-in (13 mm) thick stud tip thickness before building to full thickness
- D. Start at the lowest level and build up gradually to full thickness in an area not more than 10 ft² (1 m²)
Answer: D
Explanation:
To minimize rebound during gunning, API TR 980 clearly instructs to:
"Begin at the lowest level of the installation and build up gradually to full thickness in a small area of approximately 10 ft² (1 m²), avoiding sweeping motions."
- API TR 980, Section 4.3.4
This method prevents rebound contamination and cold joints that could occur if a larger area is covered too quickly or in an uncontrolled pattern.
Therefore, Option C is correct, and Options A, B, and D are incorrect according to best practices outlined in API TR 980.
NEW QUESTION # 49
Apparent porosity values are reported as:
- A. inches/centimeters.
- B. pounds per square inch/kilograms per square centimeter.
- C. cubic inches/centimeters.
- D. percentages.
Answer: D
Explanation:
Apparent porosityis a measure of the volume of open pores (voids that can absorb water) within a refractory sample, relative to the total volume. It is always expressed as apercentage. Testing is done using standards such as ASTM C20, which API 936 references. This metric is crucial for understanding a material's permeability, thermal shock resistance, and mechanical integrity.
Reference:
API Std 936 - Testing Procedures section referencing ASTM C20: "Porosity shall be reported as percent volume open porosity." API TR 978 - Section on Physical Properties of Monolithic Refractories
NEW QUESTION # 50
Plastic refractories with a workability index below the manufacturer's minimum required value shall be:
- A. accepted if the material is still workable.
- B. mix with additional water or activator.
- C. subject to requalification or discard.
- D. subject to additional production sample testing.
Answer: C
Explanation:
API Std 936 is very specific about the consequences of failing workability index tests:
"Plastic refractory material that fails to meet the minimum manufacturer's workability index shall be subject to requalification testing or discarded."
- API Std 936, Section 6.4.6
No provision is made for adding water or extending mixing, as this would compromise material performance.
Thus:
A is correct.
B and C violate the standard.
D is not a prescribed corrective action in this case.
NEW QUESTION # 51
The terminology for testing refractory that was sampled during installation in order to confirm that they meet specified physical property standards is called
- A. As - installed testing
- B. Physical property test
- C. None of the above
- D. Both of the above
Answer: A
NEW QUESTION # 52
Newly applied cast linings must cure before stripping the forms per the:
- A. manufacturer's recommendations.
- B. owner's recommendations.
- C. MSDS.
- D. inspector's recommendations.
Answer: A
Explanation:
The curing of newly installed refractory linings must adhere strictly to manufacturer guidelines to ensure integrity and performance:
"Forms shall not be stripped until the lining has cured per the manufacturer's recommendation."
- API Std 936, Section 5.4.2.1
The manufacturer's recommendations ensure that the product reaches sufficient strength before demolding.
NEW QUESTION # 53
In API RP 936, the referenced ASTM standard procedure for cold crushing strength and modulus of rupture is
- A. C181 - 91
- B. C 133 - 97
- C. C704 - 01
- D. None of the above
Answer: B
NEW QUESTION # 54
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. Two
- B. Four
- C. One
- D. Three
Answer: A
Explanation:
API 936 requires thata minimum of two test specimens be cast for each material, per mixing crew, per shiftduring casting applications. This ensures quality assurance through redundancy, enabling confirmation of critical physical properties like density and compressive strength. The testing must reflect real field conditions and each active crew's installation consistency.
Reference:
API Std 936, Clause 7.3.2 - "At least two samples shall be prepared per material per crew per shift for as- installed testing."
NEW QUESTION # 55
Surface preparation and welding procedures are the responsibility of the:
- A. Inspector.
- B. Contractor.
- C. Owner.
- D. Manufacturer.
Answer: B
Explanation:
According to API Std 936 - Refractory Installation Quality Control, the roles and responsibilities of each party are clearly defined. Specifically, it states:
"The contractor shall be responsible for... the preparation of the surface prior to lining, and the quality of the workmanship, including the welding of anchors and any required preheat or post-weld heat treatment."
- API Std 936, Section 5.3.1, Contractor Responsibilities
Therefore, surface preparation and welding activities, including anchor welding, fall under the Contractor's scope of work. The inspector's role is to verify compliance, not to execute procedures.
NEW QUESTION # 56
The property of matter by virtue of which heat energy is transmitted through particles in contact.
- A. Thermal conductivity
- B. Thermal shock
- C. None of the above
- D. Thermal expansion
Answer: A
NEW QUESTION # 57
Equipment used during applicator qualification testing shall be:
- A. the same as will be used for the installation.
- B. provided by the refractory manufacturer.
- C. ASTM certified for qualification testing.
- D. less than five years old.
Answer: A
Explanation:
According to API 936, duringapplicator qualification testing, the equipment used must beidentical to the equipment that will be used in the actual installation. This ensures that all conditions (air pressure, nozzles, mixers, vibration tools, etc.) accurately reflect field performance and allow for a true demonstration of the applicator's ability to meet the project's quality requirements.
This rule eliminates discrepancies between mock-up performance and production work, which might otherwise compromise the quality of the installed refractory. Testing with alternative or idealized equipment does not represent real installation challenges.
Reference:
API Std 936, Clause 5.2.2:"The same equipment that will be used for the installation shall be used during the qualification testing."
NEW QUESTION # 58
In the absence of owner specification, which party or individual sets the temperature limits for refractory and mix water?
- A. Independent refractory laboratory
- B. Contractor
- C. Inspector
- D. Manufacturer
Answer: D
Explanation:
When the owner does not provide explicit temperature criteria for mixing and placement, the refractory manufacturer's instructions prevail:
"If not specified by the owner, the refractory manufacturer's published recommendations shall be followed for temperature limits of both material and mixing water."
- API TR 980, Section 4.5.2
Thus, Option B is correct.
NEW QUESTION # 59
Conflicts in documents and/or drawings shall be resolved by the:
- A. inspector.
- B. inspector with 30 years of service/experience.
- C. engineering company.
- D. owner.
Answer: D
Explanation:
According to API Std 936, responsibilities are clearly defined when it comes to conflicts in documents or drawings:
"Where conflicts exist in documents and/or drawings, resolution shall be by the owner."
- API Std 936, Section 4.2.1 Responsibilities
Therefore, Option B is correct. Inspectors may report or note discrepancies, but only the owner has the authority to officially resolve such conflicts.
NEW QUESTION # 60
All newly installed air-setting, hydraulic, and chemically bonded linings should be allowed to cure at the proper temperature before initial heating for a minimum of:
- A. 48 hours
- B. 18 hours
- C. 12 hours
- D. 24 hours
Answer: D
Explanation:
The cure period before initiating the dryout process is a critical phase of installation:
"Newly installed air-setting, hydraulic, and chemically bonded materials shall be allowed to cure for a minimum of 24 hours at 60 °F (16 °C) or above prior to initial heating."
- API TR 980, Section 6.2.1
This condition ensures chemical bonding processes are complete before exposure to thermal stress.
NEW QUESTION # 61
To compose a sample for the CCS test from an equivalent number of refractory shapes the specimen should be
- A. At least four
- B. At least five
- C. At least three
- D. None of the above
Answer: B
NEW QUESTION # 62
Section of transfer line in which flow is in an upward direction is called
- A. Cyclone of FCCU
- B. Riser of FCCU
- C. Plenum of FCCU
- D. None of the above
Answer: B
NEW QUESTION # 63
A typical example of hexalt anchor is
- A. S-bar
- B. Curl and Tacko anchors
- C. Hexcel
- D. All of the above
Answer: D
NEW QUESTION # 64
Refractories that are resistant to chemical attack by both acid and basic slags, refractories, or fluxes at high temperature is
- A. Basic
- B. Acid
- C. Neutral
- D. None of the above
Answer: C
NEW QUESTION # 65
Who is responsible for the accuracy of installation records?
- A. inspector
- B. owner
- C. contractor
- D. refractory manufacturer
Answer: C
Explanation:
API 936 clearly designates responsibility for records:
"The contractor shall maintain records to document installation parameters and results. These records shall be complete, legible, and available for review."
- API Std 936, Section 9.3
The inspector may verify the accuracy but is not accountable for creating or maintaining them. Thus, Option C is correct.
NEW QUESTION # 66
Hydration is the process that causes refractory concrete to:
- A. develop green strength.
- B. resist heat.
- C. become formable.
- D. dry out.
Answer: A
Explanation:
Hydrationrefers to the chemical reaction between water and cement components in refractory concretes (hydraulic bonded castables), resulting in the formation ofcalcium-aluminate hydrates, which are responsible for initial strength-known asgreen strength. This strength enables the lining to be demolded and eventually dried without mechanical failure.
Hydration is not related to final heat resistance or dryout; those come later during the firing or heat-up stages.
It is distinct from setting in air-setting refractories or sintering in ceramic-bonded types.
Reference:
API TR 978 - Section on Hydraulic Bonded Castables and Cement Chemistry: "Hydration develops green strength necessary for handling and pre-dryout stages."
NEW QUESTION # 67
The most commonly used binder for refractory concrete is
- A. silicates
- B. all of the above
- C. cements
- D. calcium aluminate cement
Answer: D
NEW QUESTION # 68
Based on screen analysis the fines (cement, fumed silica, fine alumina) in typical modern castable is
- A. 40 - 50%
- B. 20 - 30%
- C. None of the above
- D. 30 - 40%
Answer: D
NEW QUESTION # 69
The vessel downstream of the reactor used to separate different product fractions is called
- A. Transfer line of FCCU
- B. Standpipe of FCCU
- C. Fractionator of FCCU
- D. None of the above
Answer: C
NEW QUESTION # 70
For non-erosive service, what is the required number of test specimens per sample for cold crushing strength?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
According to API Std 936, cold crushing strength tests for non-erosive service require:
"For non-erosive service, a minimum of two specimens per sample shall be tested for cold crushing strength."
- API Std 936, Section 6.4.2, Cold Crushing Strength
This ensures adequate verification of mechanical integrity without the more stringent criteria used for erosive applications. Therefore, Option B is correct.
NEW QUESTION # 71
If the refractory lining is required before pressure testing, all pressure-retaining welds shall:
- A. include additional anchors.
- B. remain unlined and exposed to test medium.
- C. be lined with coal tar epoxy.
- D. be gunned with no needles.
Answer: B
Explanation:
API 936 requires that if a refractory lining must be installed before pressure testing, then pressure-retaining welds must be left exposed to allow for adequate inspection and testing:
"If lining is required before pressure testing, pressure-retaining welds shall be left unlined and exposed to the test medium."
- API Std 936, Section 5.3.2.2
This ensures that the integrity of welds can be assessed without interference from refractory materials.
NEW QUESTION # 72
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