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API-936 certification exam is a valuable credential for professionals who work with refractory materials. It demonstrates to employers and clients that the individual has a thorough understanding of refractory materials and their applications, as well as the skills necessary to install and maintain these materials. Additionally, the certification program provides professionals with access to a network of industry experts and resources, including training materials, technical publications, and conferences.
API-936 exam was developed by the American Petroleum Institute (API) and is recognized worldwide as the standard for refractory personnel certification. API-936 exam covers a wide range of topics, including refractory materials, design and installation, quality control, and inspection techniques. It is a rigorous exam that requires a thorough understanding of refractory materials and their application in various industries.
NEW QUESTION # 35
API 936, the standard test method for the workability index of fire clay and high alumina plastic refractories are
- A. C 181 - 91
- B. C 113 - 02
- C. None of the above
- D. C 133 - 97
Answer: A
NEW QUESTION # 36
To compose a sample for the modulus of rupture test from an equivalent number of refractory shapes, the specimen should be
- A. At least five
- B. At least three
- C. At least two
- D. At least four
Answer: A
NEW QUESTION # 37
A high alumina mineral usually consists of rounded concretionary grains embedded in clay-like mass and is believed to consist essentially of alumina trihydrate (Al2O3 H2O) and alumina hydrate (Al2O3 H2O) in varying proportions is called
- A. kyanite
- B. fused alumina
- C. alusite
- D. bauxite
Answer: D
NEW QUESTION # 38
Metallic anchor made from rod or bar and usually used for dual layer linings that are configured in
- A. V shape
- B. All of the above
- C. Y shape
- D. U shape
Answer: C
NEW QUESTION # 39
Size distribution of aggregate particles is determined by:
- A. rebound.
- B. expansion allowance.
- C. porosity.
- D. screen analysis.
Answer: D
Explanation:
The correct method for determining the size distribution of aggregate particles used in refractory castables isscreen analysis. This is a standardized technique for analyzing particle size distribution by passing material through a series of sieves with progressively smaller openings.
As specified in API 936 and related technical literature such as API TR 978 and API TR 980, aggregate grading and size distribution directly affect the packing density and therefore the performance of monolithic refractories. The screen analysis is fundamental in determining if aggregates fall within the prescribed grading ranges, which is critical for workability, density, and mechanical strength.
Reference:API TR 978 -Monolithic Refractories: Manufacture, Properties, and Selection, Section on
"Aggregate Grading"API Std 936 (Installation Quality Control of Monolithic Refractories) - ASTM C136
/C136M referenced in material property section.
NEW QUESTION # 40
As per ASTM C- 704, for the erosion tests, silicon carbide grit is to be used by
- A. Three-time
- B. Two time
- C. None of the above
- D. One time
Answer: D
NEW QUESTION # 41
Sections of the lining below minimum thickness shall be:
- A. roughed and gunned to full thickness.
- B. increased in thickness with a skim coat.
- C. discussed with engineer.
- D. cut out entirely and replaced.
Answer: D
Explanation:
Per API 936, linings that fall below the minimum thickness must be removed and replaced to maintain structural integrity:
"Areas below the minimum thickness shall be cut out and replaced."
- API Std 936, Section 8.2.1, Thickness Acceptance Criteria
Applying a skim coat (option B) is not an acceptable corrective action for substandard thickness.
NEW QUESTION # 42
Refractory failure mechanisms are.
- A. Erosion and corrosion
- B. All of the above
- C. Overheating and chemical attack
- D. Thermal shock and mechanical abuse
Answer: B
NEW QUESTION # 43
Refractories chemically and physically stable at
- A. Average temperatures
- B. None of the above
- C. Low temperatures
- D. High temperatures
Answer: D
NEW QUESTION # 44
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. 12 hours
- B. 18 hours
- C. 48 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 # 45
The standard size of a fabricated test panel for pneumatic gunning qualification is
- A. (600 mm x 600 mm) 24 " x 24"
- B. (500 mm x 500 mm)
- C. None of the above
- D. (700 mm x 700 mm)
Answer: A
NEW QUESTION # 46
The application of monolithic refractories by means of air placement guns is
- A. Pouring
- B. Placing
- C. Gunning
- D. Casting
Answer: C
NEW QUESTION # 47
What abrading media is required in the ASTM C-704 abrasion-resistant test?
- A. Silicon carbide
- B. FCCU catalyst
- C. Silicon nitride
- D. Alumina grit
Answer: A
Explanation:
ASTM C704 specifiessilicon carbideas the standard abrasive media used in the abrasion resistance test for refractories. This test simulates service wear caused by mechanical erosion (e.g., in FCC units). Silicon carbide is used because of its consistent hardness, angularity, and wear characteristics that represent severe operational conditions.
Reference:
API Std 936 references ASTM C704 for erosion-resistant testing and confirms silicon carbide as the specified media.
API TR 977 also documents improvements to test reproducibility with silicon carbide use
NEW QUESTION # 48
Hex mesh supplied in flexible rolls and ready fit to a curved surfaces is called
- A. All of the above
- B. Flexmesh
- C. Hexcel
- D. Hexalt anchor
Answer: B
NEW QUESTION # 49
From each production run, the testing frequency for erosion service refractory is one sample per:
- A. 2 tons or less
- B. 3 pallets or less
- C. 1 pallet or less
- D. batch
Answer: A
Explanation:
API 936 establishes quality assurance testing frequencies based on usage, service condition, and criticality of application. Forerosion service refractory, which is subject to high-velocity particle impingement (e.g., in FCCU units), the standard testing frequency isone sample per 2 tons or less. This ensures that each significant quantity used in fabrication is represented by a test sample to verify compressive strength, density, and abrasion resistance.
Failure to meet this frequency may risk undetected variability in raw material batches or mixing inconsistencies.
Reference:
NEW QUESTION # 50
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Tested Material Used To API-936 Test Engine: https://www.latestcram.com/API-936-exam-cram-questions.html
Steps Necessary To Pass The API-936 Exam: https://drive.google.com/open?id=1tSiciPUzz2vKup93HXeDTbGgcpE7oYAj
