This article is about Plumbing QC Inspector CBT Exam Questions, Question Answering with technical reasoning in details with answers.
Plumbing QC Inspector Aramco CBT Exam Questions
Q.34 What is the typical range of spacing between fins for an evaporator and a condenser? Which of the following options provides the closest estimate?
a) 12 per sq. inch b) 9 per sq. inch c) 16 per sq. inch d) 10 per sq. inch
Q.35 What is the angle at which the first mixer should be positioned in a clockwise direction from the inlet nozzle? Which of the following options is the correct angle?
a) 22-1/2 degrees b) 21 degrees c) 12-1/4 degrees d) None of the above
Q.36 What color is used to identify Type L copper pipes? Choose the correct answer from the following options:
a) Blue b) Red c) Green d) Yellow
Q.37 What is the recommended depth for jointing pipes outside a trench?
a) 2 meters b) 0.5 meters c) 4 meters d) 1 meter
Q.38 What is the recommended width of the collar to which a flexible duct should be attached?
a) 50 mm (2 inches) b) 25 mm (1 inch) c) 45 mm (1.5 inches) d) 35 mm (3 inches)
Q.39 What is the recommended minimum efficiency rating for internal air circulation filters?
a) 0.85 b) 0.65 c) 0.45 d) 0.75
Q.40 What is the minimum temperature rating required for the fusible link of a fire damper?
a) 175°F b) 170°F c) 160°F d) None of the above
Q.41 What does the term “DX System” refer to?
a) Direct Expansion System b) Dielectric System
c) Damper Expansion System d) None of the above
Q.42 Is it permissible to recirculate air in Battery Rooms, Toilets, TERs (Transformer Equipment Rooms) and Kitchens?
a) FALSE b) TRUE
Q.43 What is the maximum temperature for unattended electrical substations?
a) 32 DEG. C+ b) 28 DEG C+- c) 26 DEG C+- d) 29 DEG C+-
Q-44. If a valve is connected from a metallic pipe to a non-metallic pipe, what will be the appropriate flange rating for the non-metallic pipe?
a) Volt torquing choice b) Support to prevent sagging c) Die Electric System d) None of the above
Q-45. HVAC Equipment should have foundation of for Unpaved area.
a) 150 mm ht b) 100 mm ht c) 200 mm ht d) 50 mm ht
Q.46 Is it appropriate to use Variable Air Volume (VAV) terminal boxes for air balancing purposes?
a) TRUE b) FALSE
Q.47 What is the appropriate angle for a 1/8 bend, based on its size?
a) 45 Deg b) 90 Deg c) 120 Deg d) 85 Deg
Q.48 What is the maximum distance allowed between two main sewer holes in a plumbing system?
a) 90 Mts b) 50 Mts c) 100 Mts d) 80 Mts
Q.49 What is the maximum flow rate allowed for a shower head in gallons per minute (GPM) at 80 pounds per square inch (PSI) or 552 kilopascals (KPa)?
a) 2.5 gallon b) 3.5 gallon c) 5.5 gallon d) 4.5 gallon
Q.50 What does the standard SAES-S-010 refer to?
a) Sanitary Sewers b) Oily Water Drainage Systems c) Storm Water Drainage Systems d) Non of the above
Q.51 What is the maximum area that a sprinkler head can cover in a fire protection system?
a) 400 sq.ft / 3.7 mtr² b) 200 sq.ft / 3.3 mtr² c) 300 sq.ft / 2.7 mtr² d) 100 sq.ft / 3.9 mtr²
Q.52 What is the minimum height requirement for outdoor air intakes in pressurized buildings?
a) 4.5 mts ht b) 6.5 mts ht c) 5.5 mts ht d) 8.5 mts ht
Q.53 What is the required insulation thickness and density for the casing of an Air Handling Unit (AHU)?
a) 2” thk with 48 kg/density. b) 1” thk with 36 kg/density. c) 1/2” thk with 42 kg/density. d) Non of the above
Q.54 What does the standard SAES-S-060 refer to?
a) Saudi Aramco Plumbing Code b) Oily Water Drainage Systems c) Storm Water Drainage Systems d) Non of the above
Q.55 According to the standard practice, are all sprinkler systems required to be arranged for flushing, and should all cross mains and branch lines have readily removable fittings?
a) *TRUE b) *FALSE
Q.56 What is the minimum height required for a funnel?
a) 8mm (3”ht) b) 4mm (1.5”ht) c) 16mm (6”ht) d) Non of the above
Q.57 What is the maximum aspect ratio allowed for ducts according to standard practices?
a) 0.167361111111111 b) 0.168055555555556 c) 0.170138888888889 d) Non of the above
Q.58 What is the minimum distance required for a vent termination from a vertical surface?
a) 12 foot b) 16 foot c) 10 foot d) 14 foot
Q.59 What is the color code for Copper Pipe Type M?
a) Red b) Blue c) Green d) Yellow
Q.60 Do fire dampers need to be installed in walls with a fire rating of more than 3 hours or less than 3 hours?
a) TRUE b) FALSE
Answers:
| 34 | C |
| 35 | B |
| 36 | B |
| 37 | C |
| 38 | A |
| 39 | C |
| 40 | C |
| 41 | C |
| 42 | A |
| 43 | C |
| 44 | B |
| 45 | B |
| 46 | A |
| 47 | B |
| 48 | B |
| 49 | A |
| 50 | C |
| 51 | A |
| 52 | B |
| 53 | A |
| 54 | B |
| 55 | A |
| 56 | C |
| 57 | C |
| 58 | B |
| 59 | C |
| 60 | A |
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Questions Technical Reasoning
Ans: 41 The correct answer is a) Direct Expansion System, which is a type of HVAC system that uses a refrigerant to directly cool the air that is circulated throughout a building. The refrigerant is evaporated in an indoor coil, and the resulting cooled air is distributed through ductwork to provide cooling comfort.
Ans: 42 The correct answer is a) FALSE. Air recirculation may not be allowed in these areas due to the potential presence of hazardous gases or odors, fire hazards, and health and safety concerns. It is important to consult the relevant codes and regulations to ensure proper ventilation and air quality in these areas.
Ans: 43 The correct answer is a) 32 DEG. C+. Unattended electrical substations are those that are not continuously manned, and the temperature within the substation should not exceed the maximum allowable temperature to ensure safe operation of the electrical equipment. The specific maximum temperature may vary based on the relevant codes and standards.
Ans: 45 The correct answer is b) 100 mm ht. HVAC equipment should be installed on a solid, stable, and level foundation that is capable of supporting the weight of the equipment and any vibration or movement. For unpaved areas, the foundation should be at least 100 mm high to provide a stable base and prevent settling or shifting. The foundation should also be sloped to ensure proper drainage and prevent water accumulation.
Ans: 46 The correct answer is a) Variable Air Volume (VAV) terminal boxes are designed to regulate the amount of air flow in a space, based on the temperature and occupancy needs of the area. However, they should not be used for air balancing purposes.
Ans: 47 Answer: B) 90 Deg
A 1/8 bend is a type of plumbing fitting that is used to change the direction of a piping system by 22.5 degrees. This fitting is commonly used in plumbing systems to create small turns or changes in direction.
The appropriate angle for a 1/8 bend is 90 degrees, regardless of its size. This means that the fitting will create a 22.5-degree angle within the piping system, allowing for a slight change in direction without creating too much resistance or obstruction in the flow of fluid or gas.
Option A (45 degrees) is not the correct answer as it represents the angle for a 1/4 bend. Option C (120 degrees) and option D (85 degrees) are not commonly used angles for any type of bend in a plumbing system. Therefore, the correct answer is B (90 degrees).
Ans: 49 Explanation:
The flow rate of a shower head is the amount of water that passes through it in a certain amount of time, typically measured in gallons per minute (GPM) or liters per minute (LPM). In order to conserve water and energy, many plumbing codes and standards specify a maximum flow rate for shower heads.
Ans:51 Explanation: Answer: A) 400 sq.ft / 3.7 mtr²
In a fire protection system, sprinkler heads are installed to automatically discharge water when a fire is detected in order to control or extinguish the fire. To ensure that the water is distributed evenly and effectively, the coverage area of each sprinkler head is regulated by plumbing codes and standards.
As per the standard plumbing codes and practices, the maximum area of coverage of any sprinkler head in a fire protection system should not exceed 400 square feet (37.16 square meters). This means that if the total area to be protected exceeds 400 square feet, additional sprinkler heads must be installed to provide adequate coverage.
Option B (200 square feet), option C (300 square feet), and option D (100 square feet) are not correct, as they represent coverage areas that are less than the maximum limit allowed by plumbing codes and standards. Therefore, the correct answer is A) 400 sq.ft / 3.7 mtr².
Ans:52 B) 6.5 mts ht Explanation:
Pressurized buildings, such as cleanrooms, laboratories, and hospitals, require a continuous supply of clean and fresh air to maintain a controlled environment and protect occupants from airborne contaminants. The outdoor air intake system plays a critical role in delivering this air supply, and its design and installation are regulated by plumbing codes and standards.
As per the standard plumbing codes and practices, outdoor air intakes for pressurized buildings must be located at a minimum height of 6.5 meters (21.3 feet) above the ground level. This is to ensure that the air supply is not contaminated by exhaust gases, dust, or other pollutants that may be present at ground level.
Option A (4.5 mts ht), option C (5.5 mts ht), and option D (8.5 mts ht) are not correct, as they represent height requirements that are either below or above the minimum limit allowed by plumbing codes and standards. Therefore, the correct answer is B) 6.5 mts ht.
Answer:53 Explanation: A) 2” thk with 48 kg/density.
Air Handling Units (AHUs) are used in HVAC systems to circulate and condition air within a building. The casing of an AHU is typically insulated to prevent heat loss or gain, control condensation, and reduce noise transmission. The required insulation thickness and density for the AHU casing depend on the specific application and environmental conditions.
As per the standard plumbing codes and practices, the minimum insulation thickness for the AHU casing is 2 inches (50.8 mm), and the minimum insulation density is 48 kg/m³. This means that the insulation material used should have a density of at least 48 kilograms per cubic meter and be at least 2 inches thick to ensure adequate thermal insulation and prevent condensation.
Option B (1” thk with 36 kg/density) and option C (1/2” thk with 42 kg/density) are not correct, as they represent insulation thickness and density values that are below the minimum limit allowed by plumbing codes and standards. Therefore, the correct answer is A) 2” thk with 48 kg/density.
Answer:54 Explanation: B) Oily Water Drainage Systems
SAES-S-060 is a standard issued by the Saudi Arabian Oil Company (Saudi Aramco) that provides guidelines and requirements for the design, construction, and operation of Oily Water Drainage Systems in their facilities. Oily Water Drainage Systems are used to collect and transport water contaminated with oil and other hydrocarbons from different sources, such as tanks, process equipment, and spills, to treatment facilities or disposal sites.
The standard covers various aspects of Oily Water Drainage Systems, including system layout and components, piping materials and installation, oil-water separation and treatment, monitoring and control, and safety and environmental considerations. The aim of the standard is to ensure the safe and efficient operation of Oily Water Drainage Systems and to minimize the impact of oil and hydrocarbon releases on the environment.
Answer:55 Explanation: A) TRUE
Flushing is a process that involves the removal of debris, sediments, and microbial growth from the internal surfaces of piping systems to maintain their hydraulic performance and prevent clogging and corrosion. Flushing is especially critical for sprinkler systems, as any obstruction in the piping can significantly affect the system’s ability to deliver water to the fire.
As per standard plumbing codes and practices, all sprinkler systems must be arranged for flushing. This means that the system layout and piping design should allow for easy access to all components and facilitate the flushing process. The standard also requires that readily removable fittings be provided at the ends of all cross mains to facilitate flushing, and that all cross mains terminate in 10″ (8 mm) or larger pipe.
Answer:56 Explanation: c) 16mm (6”ht)
A funnel is a conical-shaped tool used for pouring liquids or powders into containers with small openings. In plumbing, funnels are often used for filling and draining fluids in tanks and vessels.
The minimum height required for a funnel depends on the size and type of the funnel and the application. However, in general, a minimum height of 16mm (6 inches) is recommended for a standard funnel to ensure that the liquid or powder being poured flows smoothly without splashing or spilling.
Anser:57 Explanation:
Aspect ratio is the ratio of the width of a duct or channel to its height. It is an important parameter that affects the airflow and pressure drop in the duct. A high aspect ratio can lead to increased resistance to airflow, which can affect the performance of the HVAC system.
Answer:58 Explanation: b) 16 foot
A vent termination is an opening in a building’s roof or exterior wall that allows air to flow in and out of the plumbing system. Vent terminations are required to prevent pressure buildup in the pipes, which can lead to leaks, odors, and other problems.
According to standard plumbing practices, a vent termination should be located at least 6 inches above the roof to prevent rainwater or snow from entering the vent. In addition, the vent termination should be located at least 16 feet away from any vertical surface, such as a wall or window. This distance ensures that the vented air is dispersed adequately and does not recirculate into the building.
Answer:59 Explanation: c) Green
Copper pipes are commonly used in plumbing systems because of their durability and resistance to corrosion. They come in different types, identified by letters such as Type M, Type L, and Type K. These types indicate the thickness of the pipe wall, with Type M being the thinnest.
Answer:60 Explanation: A) TRUE
Fire dampers are passive fire protection devices that are designed to prevent the spread of fire and smoke through HVAC ducts and openings in fire-rated walls and floors. They are typically required by building codes and standards to be installed in certain types of buildings and spaces, depending on the level of fire protection required.
According to most building codes and standards, fire dampers are required in walls with a fire rating of more than 3 hours or less than 3 hours. This means that fire dampers may be required in walls with a fire rating of exactly 3 hours, depending on the specific code or standard being used.
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