IMPORTANT NOTICE
Feedback
We have developed quality product and state-of-art service to ensure our customers interest. If you have any suggestions, please feel free to contact us at feedback@certsout.com
Support
If you have any questions about our product, please provide the following items: exam code screenshot of the question login id/email please contact us at and our technical experts will provide support within 24 hours. support@certsout.com
Copyright
The product of each order has its own encryption code, so you should use it independently. Any unauthorized changes will inflict legal punishment. We reserve the right of final explanation for this statement.
Question #:1 - [Installation Procedures]
The mock-up for vibration cast installations demonstrates the adequacy of the: (This may have more than one correct answer; please select all that apply.)
craftsman's ability to construct the forms. equipment.
means of vibrator attachment. vibration method.
Answer: B C D
Explanation
According to , Section 4.4.2, mock-ups are required prior to actual installation for vibration-cast API TR 980 materials to verify the . These adequacy of equipment, the method of vibration, and vibrator attachment mock-ups are not intended to assess the craft skill in form construction.
"Mock-up vibration-casting trials are used to demonstrate the adequacy of the equipment, the means of vibrator attachment, and the method of vibration for the particular installation geometry and refractory type."
TR 980, Section 4.4.2
Therefore:
B (equipment)is correct.
C (means of vibrator attachment)is correct.
D (vibration method)is correct.
A (craftsman’s ability to construct the forms)is not the intent of this mock-up and thus not correct.
Question #:2 - [Installation Procedures]
A pigment shall be used in the curing compound in order to:
prevent ultraviolet light damage.
help the lining retain moisture.
help the lining retain heat.
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."
Question #:3 - [Terms, Definitions, and Abbreviations]
A layer coat of refractory lining that is applied to an existing lining in an attempt to extend the lining's life is known as:
buttercoat
overlay paint
overspray
Answer: B
Explanation
The term “overlay” is defined in refractory terminology as:
“Overlay: A layer of refractory material applied over an existing lining, generally to extend service life or repair localized damage.”
— API TR 980, Section 2, Definitions
The other terms do not carry this specific meaning in the context of refractory maintenance.
Question #:4 - [Installation Procedures]
If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be:
cut back within 1 hour.
cut back within 30 minutes.
immediately cut back to the shell between anchors. cut back to the shell in a straight line.
Answer: C
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.”
Question #:5 - [Installation Procedures]
Initial heating of newly installed refractory linings shall be performed with:
(This may have more than one correct answer; please select all answers that apply.)
electrical heating elements. open torches.
portable burners. process heating devices.
Answer: A C D
Explanation
According to TR 980, direct open flame torches are not recommended for dryout because of their uneven heating and local overheating risk:
“Initial heating may be performed using portable burners, electrical heating elements, or process heating devices. Use of open torches is not recommended due to potential for localized overheating and damage.”
— API TR 980, Section 5.3.3
Therefore:
A (electrical heating elements): Acceptable
B (open torches): Not acceptable
C (portable burners): Acceptable
D (process heating devices): Acceptable
Question #:6 - [Material Requirements]
Which of the following does not apply to cold crushing strength (CCS)?
Density of sample affects testing loading rate
Testing shall be in accordance with ASTM C1113
CCS shall be determined on samples that have been fired to 1500°F (815°C)
The loading head of the testing machine shall have a spherical bearing block
Answer: B
Explanation
Cold crushing strength testing must conform to ASTM C133, not C1113. ASTM C1113 applies to thermal conductivity measurements using hot-wire techniques, not compressive strength.
“CCS shall be determined in accordance with ASTM C133. The loading surface of the test machine shall be a steel bearing block with a spherical bearing surface.”
— API Std 936, Section 6.4.2
Thus:
A is correct (density can affect rate of loading).
B is incorrect, making it the correct answer.
C and D are correct per standard testing procedures.
===========
Question #:7 - [Terms, Definitions, and Abbreviations]
Which term is used to describe a newly installed monolithic refractory lining that has not been exposed to either a dry-out or initial heating?
Castable refractory
B. C.
Wet refractory
Installed refractory
Answer: B
Explanation
The API 936 terminology section defines "green refractory" as:
“Green Refractory: A monolithic refractory that has been placed but has not yet been exposed to curing or dryout temperatures.”
— API Std 936, Section 3: Definitions
Thus, “green refractory” is the technically correct term for the unheated, freshly installed condition. ===========
Question #:8 - [Terms, Definitions, and Abbreviations]
D. A.
B. C.
calcined frits.
D. Green refractory
mineral additives. granular grog.
Answer: A
Explanation
Materials that are easily reduced to a granular or powdery condition after placement are known as: friable materials.
Per , friable materials are defined as: API Std 936
“Friable: A term applied to a material that is easily reduced to a powdery or granular state by crushing or rubbing.”
API Std 936, Section 3: Definitions
This is a key property considered in refractory evaluation because friability can indicate material weakness after installation.
Therefore: A (friable materials)is the correct and technically defined term.
The other terms refer to distinct classes of materials not defined this way.
Question #:9 - [Inspection and Testing Requirements]
For erosion service, density results are determined from which of the following specimens?
Crushing cubes and linear change bars
Abrasion plates only
Crushing cubes only
Abrasion plates and linear change bars
Answer: D
Explanation
For linings intended for erosive service, API 936 requires testing that includes specimens that experience real service wear simulation:
“For erosive service, bulk density shall be determined using the abrasion resistance test specimens and the linear change specimens.”
— API Std 936, Section 6.4.3
Thus, both abrasion plates and linear change bars are used to evaluate density in erosion-sensitive applications.
Question #:10 - [Material Requirements]
The best definition for creep is: deformation due to continuous load over time. an increase in expansion at high temperatures. shrinkage at high temperatures. cracking caused by thermal shock.
Answer: A
Explanation
Creepin refractories is the slow, time-dependentdeformation of a material under constant stressand high temperature. It is critical in applications like reformers and furnaces where the refractory is under load for extended periods. The amount of deformation is typically measured over 50–100 hours in standardized tests such as ASTM C832.
Creep is not the same as thermal expansion (which is reversible), or cracking (a sudden failure).
Reference:
API TR 981 –Thermal Expansion Under Load and Creep of Refractories, defines creep as deformation due to a sustained load over time under high temperatures
About certsout.com
certsout.com was founded in 2007. We provide latest & high quality IT / Business Certification Training Exam Questions, Study Guides, Practice Tests.
We help you pass any IT / Business Certification Exams with 100% Pass Guaranteed or Full Refund. Especially Cisco, CompTIA, Citrix, EMC, HP, Oracle, VMware, Juniper, Check Point, LPI, Nortel, EXIN and so on.
View list of all certification exams: All vendors
We prepare state-of-the art practice tests for certification exams. You can reach us at any of the email addresses listed below.
Sales: sales@certsout.com
Feedback: feedback@certsout.com
Support: support@certsout.com
Any problems about IT certification or our products, You can write us back and we will get back to you within 24 hours.