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NEW QUESTION # 32
The formation of slag takes place by chemical action and fusion at furnace operating temperature in the way of
- A. In smelting operation, through the combination of a flux, such as limestone, with the gangue or waste portion of the ore
- B. By chemical reaction between refractories and fluxing agents such as coal ash, or between two different types of refractories
- C. In the refining of metals by substances such as lime added for the purpose of affecting or aiding the refining
- D. All of the above
Answer: A
NEW QUESTION # 33
As per API recommended practice 936, the standard test method for reheat change of refractory brick is
- A. None of the above
- B. C 133 - 97
- C. C 181 - 91
- D. C113 - 02
Answer: D
NEW QUESTION # 34
Refractories chemically and physically stable at
- A. None of the above
- B. High temperatures
- C. Average temperatures
- D. Low temperatures
Answer: B
NEW QUESTION # 35
Newly applied cast linings must cure before stripping the forms per the:
- A. manufacturer's recommendations.
- B. MSDS.
- C. inspector's recommendations.
- D. owner'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 # 36
Which of the following is the inspector responsible for?
- A. Testing water to be used
- B. Providing compliance data sheets
- C. Hammer testing newly installed linings
- D. Qualification testing
Answer: C
Explanation:
Theinspector's responsibilities, as defined in API 936, include visual and mechanical inspection of installed linings.Hammer testingis one such non-destructive method used to detect delamination, voids, and rebound areas by listening for variations in sound. It is a practical method during and after installation.
Other tasks like providing compliance documentation or water testing are typically done by the contractor or laboratory personnel.
Reference:
API Std 936, Section 7.1 - "Inspectors shall perform hammer testing as part of surface inspection to detect voids and delamination."
NEW QUESTION # 37
Test panels for pneumatic gunning are inclined above the horizontal at an angle of
- A. None of the above
- B. 60?
- C. 30?
- D. 45?
Answer: D
NEW QUESTION # 38
As installed testing is the terminology for testing refractory that was sampled during installation in order to confirm that they meet specified.
- A. None of the above
- B. Physical property standards
- C. Both as above
- D. Chemical property standards
Answer: B
NEW QUESTION # 39
Refractory failure mechanisms are.
- A. Erosion and corrosion
- B. Overheating and chemical attack
- C. Thermal shock and mechanical abuse
- D. All of the above
Answer: D
NEW QUESTION # 40
What is the ASTM test designation for cold crush strength?
- A. C-417
- B. C-133
- C. C-113
- D. C-704
Answer: B
Explanation:
The correct ASTM designation for testingcold crushing strength (CCS)of refractory materials isASTM C133.
This test determines the load at which a sample fails under compressive stress and is essential for assessing the structural integrity of castable and formed refractories.
ASTM C113 relates to permanent linear change.
ASTM C704 is for abrasion resistance.
ASTM C417 is not related to CCS in this context.
Reference:
API Std 936 references ASTM C133 as the governing method for determining cold crushing strength of refractory samples.
Also validated in API TR 978 -Monolithic Refractories: Properties and Selection
NEW QUESTION # 41
Based on screen analysis the fines (cement, fumed silica, fine alumina) in typical modern castable is
- A. None of the above
- B. 30 - 40%
- C. 40 - 50%
- D. 20 - 30%
Answer: B
NEW QUESTION # 42
1 solid black is the color of the stripe for the alloy material
- A. None of the above
- B. 304L
- C. 0
- D. 1
Answer: C
NEW QUESTION # 43
Refractories that are resistant to chemical attack by both acid and basic slags, refractories, or fluxes at high temperature is
- A. None of the above
- B. Basic
- C. Neutral
- D. Acid
Answer: C
NEW QUESTION # 44
Who is responsible for ensuring that the material and applicator qualification test results are fully documented?
- A. Inspector
- B. Owner
- C. Contractor
- D. Manufacturer
Answer: C
Explanation:
According to API 936, thecontractoris the entity responsible for overseeing and implementing the quality control system for refractory installation, which includes the documentation of all material and applicatorqualification test results. This responsibility includes maintaining traceability, ensuring compliance with testing protocols, and presenting evidence of conformity for review.
API 936 outlines that proper documentation is part of the contractor's quality assurance program and must be made available to the inspector and owner upon request. This ensures that refractory materials and installation personnel meet the project requirements before work proceeds.
Reference:
API Std 936, Clause on Quality Control Documentation: "The contractor shall maintain complete records of all material qualification tests, applicator qualifications, and inspection reports." TR 980 also supports this under pre-installation responsibilities for contractors.
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. mortar
- B. all of the above
- C. castable
- D. ceramic modules
Answer: C
NEW QUESTION # 46
Which party provides the quality requirements for hammer testing, extent of cracking, and surface voids?
- A. The owner
- B. The inspector
- C. The refractory manufacturer
- D. The contractor
Answer: A
Explanation:
API 936 specifies that:
"The owner shall provide acceptance criteria for hammer testing, visible cracking, and surface voids."
- API Std 936, Section 8.3.1
This ensures that acceptance standards align with the owner's operational and design tolerances. Option A is correct.
NEW QUESTION # 47
For modules of rupture test of brick and shapes, the preferred test specimen shall be standard
- A. None of the above
- B. 150 x 114 x 76mm
- C. 200 x 150 x 76mm
- D. 228 x 114 x 64 or 76mm
Answer: D
NEW QUESTION # 48
Fused silica aggregate is used as a raw material in a castable providing
- A. None of the above
- B. Low thermal expansion
- C. Low thermal conductivity
- D. Low thermal conductivity and low thermal expansion
Answer: D
NEW QUESTION # 49
Who is responsible to provide details of metal fiber reinforcement including dimensions, concentration, type and metallurgy?
- A. Inspector
- B. Owner
- C. Contractor
- D. Manufacturer
Answer: D
Explanation:
The manufactureris responsible for specifying the exactdimensions, type, concentration, and metallurgical propertiesof metal fiber reinforcement in castable refractories. These fibers are often integral to the formulation and performance of the material and are introduced during manufacturing (not field mixing), with characteristics tailored to improve thermal shock resistance and crack propagation control.
API 936 defers to the manufacturer's technical data for the design and quality control of any material component, including reinforcement. The contractor is responsible for verifying that materials match the manufacturer's documented specification.
Reference:
API Std 936, Section on "Material Submittals" and "Manufacturer's Technical Datasheets" API TR 978, Section on "Metallic Reinforcement in Monolithics" indicates that fiber specs are a manufacturer responsibility
NEW QUESTION # 50
Refractory abrasion is defined as the wearing away of the surface by:
- A. high-velocity gases.
- B. coke buildup.
- C. the scouring action of moving solids.
- D. high-velocity hydrocarbons.
Answer: C
Explanation:
API TR 977 defines refractory abrasion in the context of erosion resistance testing:
"Abrasion is the wearing away of the surface by the mechanical scouring action of solids moving across the surface."
- API TR 977, Section 2
This distinguishes abrasion from gas or chemical attack and aligns with ASTM C704 test context.
NEW QUESTION # 51
For fire clay and some high alumina materials, the most commonly used index of refractoriness is known as:
- A. None of the above
- B. Pyrometric cone equivalent
- C. Refractoriness under load
- D. Refractoriness
Answer: B
NEW QUESTION # 52
Applicator qualification for plastic thick layer, the test panel with an applied lining thickness and anchorage shall be
- A. None of the above
- B. 500 x 500 mm
- C. 600mm x 300 mm (24" x 12")
- D. 300 x 300 mm
Answer: C
NEW QUESTION # 53
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API-936 (Refractory Personnel) Certification Exam is a highly coveted certification that aims to recognize the technical competencies of professionals in the refractories industry. The American Petroleum Institute (API) developed the certification program to promote standardization, skill mastery, and best practices in the design, installation, inspection, testing, and repair of refractory linings for furnaces, heaters, reactors, and other high-temperature equipment.
API-936 [Mar-2026] Newly Released] Exam Questions For You To Pass: https://www.practicedump.com/API-936_actualtests.html
API API-936 Exam: Basic Questions With Answers: https://drive.google.com/open?id=1xkL1oO4_hvHgSxYXlE28ZkFdoiLkIdoL