QCM : Building Utilities and Waste Systems — 14 questions

Questions et réponses du QCM

1. Which set of services is generally included under utilities in buildings?

Electricity, gas, water, sewage, and communications services
Interior finishes, furnishings, and landscaping services
Heating, ventilation, air conditioning, and fire alarms
Structural framing, roofing, and foundation services

Electricity, gas, water, sewage, and communications services

Explication

Utilities generally refer to infrastructure services such as electricity, gas, water, sewage, and communications. The other options describe building systems or construction elements rather than utilities.

2. What is the main purpose of a potable water supply in a building?

To store rainwater for landscape irrigation only
To remove wastewater from fixtures to the sewer
To provide safe drinking and hygienic water for daily activities
To generate electricity for lighting and equipment

To provide safe drinking and hygienic water for daily activities

Explication

Potable water supply means safe drinking and hygienic water for building needs and daily use. Wastewater removal belongs to drainage, not potable supply.

3. What does a water supply system do in a building?

Ventilates plumbing shafts and prevents odors from escaping
Collects wastewater from fixtures and carries it to treatment
Brings water into the building, stores it when needed, and distributes it to fixtures
Treats sewage before it leaves the property

Brings water into the building, stores it when needed, and distributes it to fixtures

Explication

A water supply system is the arrangement that brings water into a building, stores it if needed, and distributes it to fixtures. The other options describe drainage or ventilation functions.

4. Which pipe diameter is specified for the domestic water supply in the material?

50 mm
9 mm
12 mm
20 mm

20 mm

Explication

The domestic pipe diameter is given as 20 mm, while the main distribution pipe diameter is 12 mm. The other values are associated with different topics or are not specified here.

5. Which statement best describes a cold water direct system?

It supplies fixtures directly from the mains without a storage tank
It stores water in a cistern for 12 to 24 hours of backup
It heats water centrally and sends it to hot water cylinders
It uses a storage tank and supplies floors by gravity except the kitchen sink

It supplies fixtures directly from the mains without a storage tank

Explication

A cold water direct system sends cold water directly from the mains to fixtures and does not use a storage tank. The storage-tank description belongs to the indirect system.

6. Why is a cold water indirect system useful during a mains interruption?

It provides reserved storage for about 12 to 24 hours
It prevents all contamination by removing the storage tank
It raises water temperature before supply to fixtures
It eliminates the need for any distribution pipes

It provides reserved storage for about 12 to 24 hours

Explication

The indirect system includes storage that can provide water for about 12 to 24 hours if the main is interrupted. It does use a storage tank, so the contamination-related distractor is incorrect.

7. What is the purpose of back siphonage prevention in sanitary taps?

To increase the depth of the water seal in the trap
To stop foul water from flowing back into the supply pipe
To reduce the size of the flushing cistern
To increase the temperature of water at the fixture

To stop foul water from flowing back into the supply pipe

Explication

Back siphonage prevention is a tap design feature intended to stop foul water from flowing back into the supply pipe. It is a hygiene safeguard, not a temperature or trap-depth feature.

8. What is the usual capacity of a flushing cistern mentioned in the material?

20 litre
12 litre
50 litre
9 litre

9 litre

Explication

The usual flushing cistern capacity is stated as 9 litre. The other numbers are linked to different plumbing details, such as pipe sizes or trap seals.

9. Which statement best describes a one-pipe drainage system?

It is the most expensive soil and waste disposal system
It requires separate waste stacks for appliances
It uses fewer pipes and is cheaper to install
It is used only for hot water distribution

It uses fewer pipes and is cheaper to install

Explication

The one-pipe system is described as a cheaper arrangement that uses fewer pipes and less labor. Separate waste stacks are associated with the two-pipe system.

10. What is a key feature of a two-pipes drainage system?

It combines rainwater and wastewater in one pipe only
It is cheaper than the one-pipe system
Appliances are connected to a separate waste stack
It avoids the need for any soil pipe connections

Appliances are connected to a separate waste stack

Explication

The two-pipes system requires appliances to connect to a separate waste stack and is described as the most expensive option. The other choices conflict with the stated characteristics.

11. Which waste collection system is designed for high-rise flats with inlets on each floor and collection at the bottom of a vertical shaft?

Sink grinders
Refuse bins
Garchey system
Refuse chutes

Refuse chutes

Explication

Refuse chutes are described as hollow shaft collection routes for high-rise flats, with inlets on each floor and collection at the bottom. Refuse bins are used for non-high-rise flats instead.

12. What is the purpose of a sink grinder in a solid waste collection system?

To separate ash from combustible refuse
To shred food waste into small pieces under a kitchen sink
To store refuse bags before collection
To transport waste between floors by gravity

To shred food waste into small pieces under a kitchen sink

Explication

A sink grinder is an electrically powered unit installed under a kitchen sink that shreds food waste into small pieces. The other options describe different collection or disposal functions, not a grinder.

13. Which waste disposal method is described as better than open land dumping while still involving land-based waste placement?

Sea dumping
Incineration
Controlled landfill
Wastewater treatment

Controlled landfill

Explication

Controlled landfill is presented as a better option than open land dumping, though it still uses land for waste placement. Sea dumping is described as unhygienic and environmentally risky.

14. What is a key feature of incineration as a waste disposal method?

It processes wastewater into effluent for reuse
It combusts waste while controlling emissions and managing ash
It places waste on open land with minimal treatment
It stores waste in sealed bins for later collection

It combusts waste while controlling emissions and managing ash

Explication

Incineration involves burning waste, recovering heat for energy, and controlling emissions while handling ash carefully. The other choices describe collection, wastewater treatment, or open dumping.

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Utilities — definition?

Infrastructure services provided to consumers.

Potable water supply — role?

Provides safe drinking and hygienic water.

Water entering building — divided?

Into cold water and hot water.

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