2025 Latest 100% Exam Passing Ratio - API-936 Dumps PDF [Q34-Q51]

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2025 Latest 100% Exam Passing Ratio – API-936 Dumps PDF

Pass Exam With Full Sureness – API-936 Dumps with 87 Questions

API-936 (Refractory Personnel) Exam is a certification program offered by the American Petroleum Institute (API) for individuals working in the refractory industry. Refractory materials are crucial components in high-temperature industrial processes such as steel manufacturing, petrochemical refining, and power generation. As such, the proper installation, maintenance, and inspection of refractories are critical to ensuring plant safety, reliability, and efficiency. The API-936 exam is designed to evaluate the knowledge and skills of refractory personnel and certify that they meet the industry standards for refractory installation, inspection, and testing.

API 936 certification exam is an essential program for refractory personnel who want to demonstrate their knowledge and skills in the installation, testing, and inspection of refractory materials. Refractory Personnel certification is globally recognized and can increase job opportunities and enhance professional reputation. Employers can also benefit from having API 936 certified personnel by ensuring that their refractory materials are installed, tested, and inspected correctly, which can prevent costly downtime and equipment failures.

Q34. For qualification testing, test panels for pneumatic gunning are inclined at a:

30° angle above the horizontal.

45° angle above the horizontal.

60° angle above the horizontal.

90° angle above the horizontal.

When qualifying materials and personnel for gunning applications, the standard test panel orientation is:
“The gunned panels shall be prepared on steel plate forms inclined at 45° to the horizontal.”
– API Std 936, Section 6.5.1, Gunning Test Panels
This standardized angle helps evaluate rebound and build-up in conditions that simulate typical applications.

Q35. The application of monolithic refractories by means of air placement guns is

Gunning

Placing

Pouring

Casting

Q36. Refractory samples cast during the mock-up are cured for a minimum of:

8 hours.

12 hours.

18 hours.

24 hours.

Mock-up installations serve as a qualification tool to verify that the installation procedures, personnel, and equipment can consistently meet quality standards. API 936 stipulates that refractory samples cast during the mock-up must becured for a minimum of 24 hoursbefore demolding or further processing. This curing period ensures full initial set and adequate strength development of the castable.
Failure to meet this curing requirement can result in incomplete hydration, premature cracking, or misleading performance test results. The 24-hour period allows for optimal moisture retention and chemical reaction completion in hydraulic-bonded castables.
Reference:
API Std 936, Section 6.3.3 – “Samples cast during the mock-up shall be cured in accordance with manufacturer’s recommendations but not less than 24 hours under standard conditions.”

Q37. According to API 936, test specimens are required to be held at oven dry temperature for how many hours?

API Std 936 specifies the drying duration for specimens prior to testing as follows:
“Test specimens shall be dried for not less than 12 hours at 230 °F to 250 °F (110 °C to 120 °C) to constant weight.”
– API Std 936, Section 6.3.1, Drying Procedure
This ensures the specimens are free of moisture and meet consistent testing conditions.

Q38. How many specimens per sample are required for testing by ASTM C-704?

One

Two

Three

Four

The ASTM C704 standard requires the use of two specimens per sample for testing abrasion resistance:
“The abrasion resistance shall be determined using two 4½ in. × 4½ in. × 1 in. (114 mm × 114 mm × 25 mm) specimens per test sample.”
– API Std 936, Section 6.4.4, Abrasion Resistance
This ensures accurate and reproducible results for quality control in refractory installations.

Q39. As per ASTM C- 704, for the erosion tests, silicon carbide grit is to be used by

One time

Two time

Three-time

None of the above

Q40. 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:

12 hours

18 hours

24 hours

48 hours

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.

Q41. The air pressure to blast the 1000 g of size graded silicon carbide grain for abrasion resistance test should be

448 KPa (65 PSi)

450 KPa

400 KPa

None of the above

Q42. The most commonly used binder for refractory concrete is

calcium aluminate cement

cements

silicates

all of the above

Q43. Based on-screen analysis, the size of Alumina – silicate aggregate in typical modern castable is

50 – 60%

60 – 70%

70 – 8-%

None of the above

Q44. Heating the new refractory too rapidly will cause

Structural deterioration

Explosive spalling

Chemical attack

None of the above

Q45. The quantity of manufactured refractory that has the same formulation as that prepared in an uninterrupted manufacturing operation is called a:

pallet

test sample

production run

bag

The term “production run” is defined by API 936 as follows:
“Production Run: The quantity of material manufactured using the same formulation in an uninterrupted manufacturing operation.”
– API Std 936, Section 3: Terms and Definitions
This distinguishes it from a test sample (a subset), a pallet (a packaging unit), or a bag (a smaller containment unit). The production run forms the batch basis for qualification and traceability.

Q46. Gunning test panels are constructed with removable backs as required for

laboratory test

visual inspection of the castable

physical property test

None of the above

Q47. Who is responsible to provide details of metal fiber reinforcement including dimensions, concentration, type and metallurgy?

Owner

Manufacturer

Contractor

Inspector

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

Q48. What characteristic shall be required for form selection?

Resist chemical attack

Resist mechanical loads

Self-supporting

Transparent

According to API TR 980, a form must be able to support its own weight and the pressure from the refractory material:
“Formwork shall be self-supporting and capable of withstanding the static and dynamic loads imposed during installation.”
– API TR 980, Section 4.2.1, Form Requirements
Transparency and chemical resistance are not required characteristics for refractory formwork in installation.

Q49. Materials that are easily reduced to a granular or powdery condition after placement are known as:

friable materials.

calcined frits.

mineral additives.

granular grog.

PerAPI Std 936, friable materials are defined as:
“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.

Q50. 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

mortar

castable

ceramic modules

all of the above

Q51. During gunning, inclusion of rebound is minimized by which of the following techniques?

Begin gunning at the lowest level and work around to full thickness in a spiral pattern

Start at the lowest level elevation and build up gradually to full thickness in complete rings

Start at the lowest level and build up gradually to full thickness in an area not more than 10 ft² (1 m²)

Cover all areas up to 1/2-in (13 mm) thick stud tip thickness before building to full thickness

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.

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