What is the required water pressure for a three-storied building in a distribution system?

• 7 m
• 12 m
• 17 m
• 22 m

Answer explanation

A three-storied building requires 17 m of water pressure in the distribution system.

What is the function of a goose neck in a house connection?

• Measure water
• Support stop valve
• Provide flexible connection
• Regulate flow

Answer explanation

Goose neck is a small flexible curved pipe used between water main and service pipe.

Which valve is provided at the lowest points of water mains to remove silt?

• Reflux valve
• Relief valve
• Scour valve
• Sluice valve

Answer explanation

Scour valves (mud valves) are installed at dead ends or depressions to remove silt.

What type of hydrant is located below the footpath and flush with the ground?

• Post hydrant
• Flush hydrant
• Main hydrant
• Sluice hydrant

Answer explanation

Flush hydrants are located below ground level and flush with footpath or street.

What is the primary function of a reflux valve?

• Regulate pressure
• Prevent reverse flow
• Release air
• Measure flow

Answer explanation

Reflux valves allow water to flow in only one direction and prevent backflow.

Which distribution system works purely based on gravity?

• Direct pumping
• Combined
• Gravity
• Intermittent

Answer explanation

Gravity system uses natural slope for water flow without pumps.

Which plumbing pipe carries liquid waste including human excreta?

• Vent pipe
• Waste pipe
• Rainwater pipe
• Soil pipe

Answer explanation

Soil pipe carries waste water containing human excreta.

Which pipe is installed to ventilate the sewer and is of size 50 mm?

• Vent pipe
• Soil pipe
• Waste pipe
• Anti-siphonage pipe

Answer explanation

Vent pipe allows foul gases to escape and provides ventilation to sewer lines.

Which trap is used at the junction of house sewer and municipal sewer?

• Floor trap
• Gully trap
• Intercepting trap
• Bottle trap

Answer explanation

Intercepting trap is provided at the last manhole before connecting to municipal sewer.

Which trap is commonly used below wash basins?

• P trap
• Bottle trap
• Q trap
• S trap

Answer explanation

Bottle trap is commonly installed below wash basins and sinks.