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NEW QUESTION # 29
Refractories chemically and physically stable at
- A. Average temperatures
- B. None of the above
- C. High temperatures
- D. Low temperatures
Answer: C
NEW QUESTION # 30
Blanket, Module, Bulk paper, rope, and vacuum formed shaped are:
- A. Shaped refractory
- B. Unshaped refractory
- C. All of the above
- D. Refractory fibers
Answer: D
NEW QUESTION # 31
Section of transfer line in which flow is in a downward direction is called
- A. Riser of FCCU
- B. None of the above
- C. Transfer line of FCCU
- D. Standpipe of FCCU
Answer: D
NEW QUESTION # 32
For the qualification of the applicator/installer, they shall demonstrate their ability to install the refractory:
- A. by using the technique prescribed by the manufacturer no matter which material is used.
- B. free of visible voids, laminations on the hot face or working surface only for gunned lining.
- C. free of visible voids, laminations on the hot face or working surface only of the refractory lining.
- D. to meet the specified quality standards utilized for the installation of work.
Answer: D
Explanation:
API 936 clearly states that applicators/installers must be qualified to demonstrate the ability to install refractory linings in accordance with the specified project quality standards. This includes using the correct methods, achieving proper material density, and avoiding defects like voids and laminations.
Reference:API Std 936, Section 4.2 - Installer Qualifications: "Installers shall demonstrate their ability to install the refractory system to meet the specified quality standards prior to beginning production work."
NEW QUESTION # 33
A pigment shall be used in the curing compound in order to:
- A. help the lining retain heat.
- B. help the lining retain moisture.
- C. prevent ultraviolet light damage.
- D. indicate full coverage.
Answer: D
Explanation:
Pigment in curing compounds serves a visual function to verify that the applied coating has achieved full and even coverage across the refractory surface. This aids inspectors in confirming compliance with curing requirements.
Reference:API Std 936, Section 6.3.2 - Curing Requirements: "A pigment shall be included in the curing compound to provide visual confirmation of coverage during application."
NEW QUESTION # 34
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. Regenerator of FCCU
- B. None of the above
- C. Reactor of FCCU
- D. Cyclones of FCCU
Answer: A
NEW QUESTION # 35
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. 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 elevation and build up gradually to full thickness in complete rings
- 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 # 36
The standard size of a fabricated test panel for pneumatic gunning qualification is
- A. (500 mm x 500 mm)
- B. None of the above
- C. (700 mm x 700 mm)
- D. (600 mm x 600 mm) 24 " x 24"
Answer: D
NEW QUESTION # 37
Additives used to facilitate moisture removal of refractory linings during dry out are called
- A. None of the above
- B. Organic fiber
- C. Metal fiber
- D. Mineral fiber
Answer: B
NEW QUESTION # 38
If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be:
- A. cut back within 30 minutes.
- B. immediately cut back to the shell between anchors.
- C. cut back to the shell in a straight line.
- D. cut back within 1 hour.
Answer: B
Explanation:
When installation is interrupted, the partially installed refractory must becut back to the shell between anchorswhile it is still workable. This ensures a clean, rough bonding surface free from weak or partially set material. API 936 requires this method for bothhydraulic bondedandchemically bondedsystems to preserve lining integrity and avoid delamination between old and new material.
Reference:
API Std 936, Section 6.2.3 - "When work is interrupted, material shall be cut back to the shell between anchors while still plastic."
NEW QUESTION # 39
Which of the following is a correct condition for gunned material test panels used for CCS and PLC testing?
- A. Test panels must be 24 in. × 24 in. × 6 in. thick and shot vertically.
- B. The minimum gunned thickness shall be 2 in., with a tolerance of ±0.25 in.
- C. A vibrating screed must be used during panel finishing.
- D. Test panels must be dried at 400°F (204°C) for 6 hours before specimen extraction.
Answer: B
Explanation:
API Std 936 specifies in Section 6.6.1.1 that the test panels for pneumatic gunning must be cast to a minimum thickness of 2 inches with an acceptable tolerance:
"The minimum gunned thickness shall be 2 in. (50 mm), and the final thickness shall be within ±0.25 in. (6 mm) of the target."
- API Std 936, Section 6.6.1.1
NEW QUESTION # 40
As per API recommended practice 936, the standard test method for reheat change of refractory brick is
- A. C 133 - 97
- B. None of the above
- C. C113 - 02
- D. C 181 - 91
Answer: C
NEW QUESTION # 41
Forms (types) of refractory
- A. Unshaped
- B. All above
- C. Refractory (ceramic) fibers
- D. Shaped
Answer: B
NEW QUESTION # 42
Ceramic fiber batten strips shall be:
- A. anchored with staples.
- B. the same grade as hot face material.
- C. a maximum length 3 ft (0.9 m).
- D. anchored with Lock Studs.
Answer: C
Explanation:
According to API 936, ceramic fiber batten strips are used in fiber lining applications to secure joints or protect against gas penetration. The specification sets a strict requirement on their length:
"Ceramic fiber batten strips shall be a maximum length of 3 ft (0.9 m)."
- API Std 936, Section 5.3.2.3
Other anchoring methods such as lock studs or staples may apply in different contexts or materials, but they are not prescribed for ceramic fiber batten strips per this specific requirement.
NEW QUESTION # 43
The application of monolithic refractories by means of air placement guns is
- A. Placing
- B. Casting
- C. Pouring
- D. Gunning
Answer: D
NEW QUESTION # 44
For modules of rupture test of brick and shapes, the preferred test specimen shall be standard
- A. None of the above
- B. 200 x 150 x 76mm
- C. 228 x 114 x 64 or 76mm
- D. 150 x 114 x 76mm
Answer: C
NEW QUESTION # 45
Based on screen analysis the fines (cement, fumed silica, fine alumina) in typical modern castable is
- A. None of the above
- B. 40 - 50%
- C. 30 - 40%
- D. 20 - 30%
Answer: C
NEW QUESTION # 46
For air-setting phosphate bonded, erosion-resistant refractories mixing, the mixer's paddles, and bowls shall be
- A. Aluminium
- B. None of the above
- C. Carbon
- D. Steel
Answer: D
NEW QUESTION # 47
Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:
- A. air cured, uncovered.
- B. heat cured, covered.
- C. air cured, covered.
- D. heat cured, uncovered.
Answer: A
Explanation:
Air-setting, phosphate-bonded castables rely on a chemical bonding mechanism that activates when exposed to ambient moisture and carbon dioxide. API 936 outlines that these materials should becured in ambient air without being covered, as covering can trap moisture and inhibit the proper development of the chemical bond. Covering or artificially heating during this early curing stage may lead to defects such as cracking or uneven setting.
Theminimum 24-hour air curingperiod ensures sufficient evaporation of excess water and the development of mechanical integrity before any handling, heat exposure, or further processing. Covering these castables may interfere with the air-bonding mechanism and is not recommended.
Reference:
API Std 936, Section 6.3.1: "Air-setting phosphate-bonded refractories shall be air cured, uncovered for at least 24 h." API TR 980, Section on Air-Setting Castables: Emphasizes the importance of allowing unrestricted air exposure during initial set.
NEW QUESTION # 48
Metallic anchor made from rod or bar and usually used for dual layer linings that are configured in
- A. V shape
- B. U shape
- C. All of the above
- D. Y shape
Answer: D
NEW QUESTION # 49
The maximum angle permitted for gunning below the horizontal is:
- A. 30°.
- B. 45°.
- C. 60°.
- D. 15°.
Answer: A
Explanation:
According to API Std 936, when applying refractory via pneumatic gunning, the angle below the horizontal must be controlled to avoid rebound and poor bonding.
"For downward gunning, the maximum angle below the horizontal shall be 30°."
- API Std 936, Section 6.6.2.1
This restriction ensures proper adherence and consolidation of refractory materials.
NEW QUESTION # 50
Which of the following steps are required to apply to thin-layer erosion-resistant linings?
(This may have more than one correct answer; please select all answers that apply.)
- A. Overfill will be removed until flush with the tops of the hexmetal
- B. Mix times will be determined during the material qualification testing
- C. Water slicking of the lining surface is permitted
- D. The refractory will be fully compacted in and around the anchor supports
Answer: A,B,D
Explanation:
According to API TR 980, specific practices are required during the installation of erosion-resistant refractory linings:
"Thin-layer linings shall be installed so that overfill is trimmed flush to the hexmetal..."
"Mixing procedures, including mix times and water ratios, shall be defined during material qualification testing..."
"The refractory shall be fully compacted in and around the anchor supports."
- API TR 980, Section 4.3.2
Additionally, slicking (Option A) is not permitted as it interferes with mechanical bond development.
NEW QUESTION # 51
The destructive chemical reaction between refractories and external agencies at high temperatures, resulting in the formation of a liquid is called
- A. Dusting of refractories
- B. Slumping of refractories
- C. None of the above
- D. Slagging of refractories
Answer: D
NEW QUESTION # 52
The most commonly used binder for refractory concrete is
- A. calcium aluminate cement
- B. all of the above
- C. cements
- D. silicates
Answer: A
NEW QUESTION # 53
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