Updated Nov-2025 Exam API-936 Dumps - Pass Your Certification Exam
Latest Real API API-936 Exam Dumps Questions
NEW QUESTION # 31
Test panels for pneumatic gunning are inclined above the horizontal at an angle of
- A. 60?
- B. 45?
- C. 30?
- D. None of the above
Answer: B
NEW QUESTION # 32
The surface of a refractory section not exposed to the source of heat
- A. Smooth face
- B. Hot face
- C. Cold face
- D. None of the above
Answer: C
NEW QUESTION # 33
The color of stripe for Inconel 600 alloy material of metallic anchor is
- A. 2 solid black
- B. 2 solid blue
- C. None of the above
- D. 1 solid black
Answer: B
NEW QUESTION # 34
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. Chemically bonded
- C. Cement bonded
- D. Hydraulic bonded
Answer: B
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 # 35
In API RP 936, the referenced ASTM standard procedure for cold crushing strength and modulus of rupture is
- A. C181 - 91
- B. C704 - 01
- C. C 133 - 97
- D. None of the above
Answer: C
NEW QUESTION # 36
What is the size of a test specimen for permanent linear change of refractories?
- A. 2 in. (50 mm) x 2 in. (50 mm) x 4 in.(100 mm)
- B. 2-1/2 in. (64 mm) x 2-1/2 in. (64 mm) x 2 in. (50 mm)
- C. 2 in. (50 mm) x 2 in. (50 mm) x 9 in. (230 mm)
- D. 2 in. (50 mm) x 2-1/2 in. (64 mm) x 9 in. (230 mm)
Answer: C
Explanation:
The standard specimen size for conducting tests on Permanent Linear Change (PLC) of refractories is2 in. x 2 in. x 9 in. (50 mm x 50 mm x 230 mm). This dimension is consistent with ASTM C113, which is referenced in API 936 for evaluating the dimensional stability of refractory materials after heat treatment.
Permanent Linear Change testing is essential to determine the expansion or shrinkage behavior of refractories when exposed to high temperatures, a critical property for ensuring dimensional compatibility in service.
Reference:API Std 936 - Clause on Inspection and Testing RequirementsReferenced Standard: ASTM C113 (Standard Test Method for Reheat Change of Refractory Brick)
NEW QUESTION # 37
What temperature is required to form a permanent bond in phosphate-bonded plastic refractory?
- A. 50°F to 100°F (10°C and 38°C)
- B. 500°F to 700°F (260°C and 370°C)
- C. 300°F to 500°F (150°C and 260°C)
- D. 100°F to 300°F (38°C and 150°C)
Answer: B
Explanation:
Phosphate-bonded plastic refractories develop their final bonding during high-temperature exposure. As described in TR 980:
"Phosphate-bonded plastics require temperatures between 500°F and 700°F (260°C and 370°C) to form a permanent ceramic bond."
- API TR 980, Section 5.2.3
NEW QUESTION # 38
The application of monolithic refractories by means of air placement guns is
- A. Placing
- B. Casting
- C. Pouring
- D. Gunning
Answer: D
NEW QUESTION # 39
The functions of refractories include resistance to other destructive influences such as abrasion, pressure, chemical attack, and or rapid changes in temperature is called.
- A. Primary function
- B. Tertiary function
- C. Secondary function
- D. None of the above
Answer: C
NEW QUESTION # 40
If the refractory lining is required before pressure testing, all pressure-retaining welds shall:
- A. remain unlined and exposed to test medium.
- B. be lined with coal tar epoxy.
- C. be gunned with no needles.
- D. include additional anchors.
Answer: A
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 # 41
Conflicts in documents and/or drawings shall be resolved by the:
- A. inspector with 30 years of service/experience.
- B. inspector.
- 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 # 42
Arrange for testing at either an independent laboratory or the manufacturer's plant is
- A. Manufacturer responsibility
- B. Contractor responsibility
- C. Inspector responsibility
- D. Owner responsibility
Answer: B
NEW QUESTION # 43
The standard test method for abrasion resistance of refractory materials at room temperature is
- A. C 704 - 01
- B. C 133 - 97
- C. C 181 - 91
- D. None of the above
Answer: A
NEW QUESTION # 44
Which of the following is a valid acceptance criterion for cold crushing strength of castable used in erosive service?
- A. The lowest result must exceed 90% of ASTM C401 average for gunned materials.
- B. All individual values must exceed 75% of the manufacturer's minimum published CCS.
- C. CCS must be no less than 80% of the manufacturer's advertised maximum.
- D. CCS test values must average within ±10% of the manufacturer's mean value.
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 # 45
Before refractory installations, all surfaces to be lined shall be cleaned to meet:
- A. SSPC-SP 10
- B. SSPC-SP 7/NACE 4
- C. ASTM C-113
- D. API 510
Answer: B
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 # 46
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. 200 ppm
- B. 100 ppm
- C. 250 ppm
- D. 50 ppm
Answer: D
Explanation:
According to API Standard 936, water used in the preparation of refractory mixes is subject to quality limitations, especially when stainless steel anchors are embedded in or come into contact with the refractory that is installed on a carbon steel surface. High chloride concentrations in the mixing water may promote corrosion in stainless steel anchoring systems.
API 936 explicitly states:
"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 50 ppm."
- API Std 936, Section 5.1.2
This clause is intended to protect the integrity of stainless steel anchors from chloride-induced stress corrosion cracking or pitting, which can compromise the mechanical support of the refractory lining.
Therefore, Option A (50 ppm) is the only correct and code-compliant answer.
NEW QUESTION # 47
In accordance with TR 980, when curing a high-purity, low-cement castable for a high-temperature unit, which of the following sequences ensures minimum cracking risk?
- A. Dryout using open flame burners after form removal
- B. Steam curing for 48 hours followed by firing at 1500°F
- C. Accelerated drying using forced air at 400°F for 12 hours
- D. Air curing for 24 hours, followed by controlled heating ramp of 50°F/h up to 600°F
Answer: D
Explanation:
TR 980 outlines curing and dryout best practices for monolithic refractories. For high-purity low-cement castables, gradual heat-up is necessary to avoid thermal shock and cracking:
"A minimum 24-hour air cure at ambient temperature should be followed by a controlled dryout ramp not exceeding 50°F (28°C) per hour up to 600°F (316°C)."
- TR 980, Section 6.4.2
NEW QUESTION # 48
During gunning, inclusion of rebound is minimized by which of the following techniques?
- A. Start at the lowest level elevation and build up gradually to full thickness in complete rings
- B. Cover all areas up to 1/2-in (13 mm) thick stud tip thickness before building to full thickness
- C. Start at the lowest level and build up gradually to full thickness in an area not more than 10 ft² (1 m²)
- D. Begin gunning at the lowest level and work around to full thickness in a spiral pattern
Answer: C
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
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