NEW 2025 Certification Sample Questions API-936 Dumps & Practice Exam
API-936 Deluxe Study Guide with Online Test Engine
API-936 certification program is primarily intended for refractory engineers, inspectors, and other professionals working in the refractory industry. Refractory Personnel certification program provides an opportunity for individuals to demonstrate their technical knowledge and expertise in the field of refractory materials. Refractory Personnel certification is highly valued by employers in the refractory industry and is often a requirement for certain job positions.
API API-936: Refractory Personnel Exam is a certification program designed for professionals working in the field of refractory installation and inspection. The API 936 certification program is globally recognized and provides a standardized assessment of the knowledge and skills required for refractory personnel to perform their jobs effectively.
NEW QUESTION # 40
Alumina - silica refractories containing 45% or more alumina, materials used in their production include diaspore, bauxite, gibbsite, kyanite, sillimanite, alusite, and fused alumina (artificial corundum) is called
- A. high alumina refractories
- B. all of the above
- C. insulating refractories
- D. fire clay refractory
Answer: A
NEW QUESTION # 41
Apparent porosity values are reported as:
- A. percentages.
- B. pounds per square inch/kilograms per square centimeter.
- C. cubic inches/centimeters.
- D. inches/centimeters.
Answer: A
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 # 42
The physical attributes testing of manufactured bricks during pre-shipment testing shall require a minimum Acceptable Quality Limit (AQL) of:
- A. 10%
- B. 4%
- C. 5%
- D. 1%
Answer: C
Explanation:
API 936 mandates specific AQL values during pre-shipment testing:
"Physical property test results shall meet the specified requirements with a minimum AQL of 5.0 percent."
- API Std 936, Section 5.2.4
Hence, the correct AQL for physical property verification of pre-shipment brick testing is 5%.
NEW QUESTION # 43
Spalling of layers from the hot surface of a refractory lining is called
- A. Erosion
- B. Crumbling
- C. Spalling
- D. Sheeting
Answer: C
NEW QUESTION # 44
The vessel in which coke and residual hydrocarbons are burned off the catalyst and the flue gas is then separated from the catalyst is called
- A. None of the above
- B. Regenerator of FCCU
- C. Reactor of FCCU
- D. Cyclones of FCCU
Answer: B
NEW QUESTION # 45
A combination of refractory grain and suitable bonding agent that, after the addition of a proper liquid, is generally poured into place to form a refractory shape or structure which becomes rigid because of chemical action is called
- A. castable
- B. all of the above
- C. mortar
- D. ceramic modules
Answer: A
NEW QUESTION # 46
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. Both of the above
- C. Physical property test
- D. None of the above
Answer: A
NEW QUESTION # 47
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.
Answer: B
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 # 48
The quantity of manufactured refractory that has the same formulation as that prepared in an uninterrupted manufacturing operation is called a:
- A. bag
- B. pallet
- C. production run
- D. test sample
Answer: C
Explanation:
The term "production run" is defined by API 936 as follows:
"Production Run: The quantity of material manufactured using the same formulation in an uninterrupted manufacturing operation."
- API Std 936, Section 3: Terms and Definitions
This distinguishes it from a test sample (a subset), a pallet (a packaging unit), or a bag (a smaller containment unit). The production run forms the batch basis for qualification and traceability.
NEW QUESTION # 49
Refractories chemically and physically stable at
- A. None of the above
- B. Average temperatures
- C. Low temperatures
- D. High temperatures
Answer: D
NEW QUESTION # 50
The lining surface should remain uncovered and free from contact with moisture during the curing period for what type of refractory?
- A. Ceramic bonded
- B. Cement bonded
- C. Chemically bonded
- D. Hydraulic bonded
Answer: C
Explanation:
Chemically bonded refractories, such as phosphate-bonded or acid-bonded types, develop strength through chemical reactions that requireexposure to ambient air. These materials must remainuncovered and dry during curing, as moisture or covering may inhibit the required chemical bonding or lead to improper set.
Covering chemically bonded linings (e.g., with plastic sheeting or wet burlap) - practices appropriate forhydraulic bonded(cement-based) refractories - would trap moisture and interfere with the chemical reaction process in chemical bonds.
Reference:
API TR 980 -Monolithic Refractories: Installation and Dryout, Section on Chemically Bonded Refractories:
"Do not cover chemically bonded castables during the curing period. Keep surfaces exposed to air."
NEW QUESTION # 51
For air-setting phosphate bonded, erosion-resistant refractories mixing, the mixer's paddles, and bowls shall be
- A. Carbon
- B. Aluminium
- C. None of the above
- D. Steel
Answer: D
NEW QUESTION # 52
For fire clay and some high alumina materials, the most commonly used index of refractoriness is known as:
- A. Refractoriness
- B. Refractoriness under load
- C. Pyrometric cone equivalent
- D. None of the above
Answer: C
NEW QUESTION # 53
The destructive chemical reaction between refractories and external agencies at high temperatures, resulting in the formation of a liquid is called
- A. Slagging of refractories
- B. None of the above
- C. Dusting of refractories
- D. Slumping of refractories
Answer: A
NEW QUESTION # 54
Newly applied cast linings must cure before stripping the forms per the:
- A. MSDS.
- B. inspector's recommendations.
- C. manufacturer's recommendations.
- D. owner's recommendations.
Answer: C
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 # 55
Materials having refractory properties which form a refractory body when bonded into a conglomerate mass by a matrix is called
- A. Refractory aggregate
- B. None of the above
- C. Refractory mass
- D. Cementitious concrete
Answer: A
NEW QUESTION # 56
To compose a sample for the modulus of rupture 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. At least two
Answer: B
NEW QUESTION # 57
Compositions of ground refractory materials develop a strong bond at air ambient temperatures by virtue of chemical reactions within the binder phase that is usually activated by water additions. These refractories include cement and phosphate bonded castables is called:
- A. Heat setting refractories
- B. Air and heat setting refractory
- C. Air setting refractories
- D. None of the above
Answer: C
NEW QUESTION # 58
Before refractory installations, all surfaces to be lined shall be cleaned to meet:
- A. SSPC-SP 7/NACE 4
- B. API 510
- C. ASTM C-113
- D. SSPC-SP 10
Answer: A
Explanation:
API 936 requires a specific level of surface cleanliness before lining application:
"All surfaces to be lined shall be cleaned in accordance with SSPC-SP 7/NACE No. 4 (Brush-Off Blast Cleaning)."
- API Std 936, Section 5.3.2.1
This brush-off blast cleaning ensures adequate bonding without aggressive surface treatment.
NEW QUESTION # 59
Which of the following is a valid acceptance criterion for cold crushing strength of castable used in erosive service?
- A. CCS test values must average within ±10% of the manufacturer's mean value.
- B. All individual values must exceed 75% of the manufacturer's minimum published CCS.
- C. The lowest result must exceed 90% of ASTM C401 average for gunned materials.
- D. CCS must be no less than 80% of the manufacturer's advertised maximum.
Answer: B
Explanation:
API Std 936 defines the acceptance criteria for CCS under erosive service in Section 6.4.2:
"Test values for cold crushing strength shall meet or exceed 75% of the manufacturer's minimum published value for each individual specimen."
- API Std 936, Section 6.4.2
This criterion ensures that all tested samples meet a critical durability threshold before field acceptance.
NEW QUESTION # 60
Refractory failure mechanisms are.
- A. Thermal shock and mechanical abuse
- B. Overheating and chemical attack
- C. All of the above
- D. Erosion and corrosion
Answer: C
NEW QUESTION # 61
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