D59 QUIZ OF THE DAY

Which joint allows slight movement in the pipeline to accommodate expansion and contraction?

• Simplex joint
• Expansion joint
• Collar joint
• Spigot and socket joint

Answer explanation

Expansion joints accommodate pipe expansion and contraction due to temperature changes.

Which joint consists of a metal sleeve, rubber rings, and threaded rings?

• Expansion joint
• Dresser coupling
• Flanged joint

• none

Answer explanation

Dresser couplings allow joining plain pipe ends using a mechanical arrangement.

Which trap is provided at the intercepting chamber?

• Floor trap
• Intercepting trap
• Gully trap
• P trap

Answer explanation

Intercepting trap blocks entry of sewer gases into the house drainage system.

In a sewer layout, what is the direction of socket end during pipe laying?

• Upstream
• Downstream
• Facing manhole
• Facing outlet

Answer explanation

Socket end faces upstream to ensure smooth flow without obstruction.

Which test is used to detect gas leakage through joints using visual bubbles?

• Smoke test
• Soap solution test
• Water test
• Mirror test

Answer explanation

Soap solution test visually shows air bubbles if leakage exists.

What should be the bedding thickness below sewer pipes?

• 75 mm
• 100 mm
• 150 mm
• 200 mm

Answer explanation

Standard bedding thickness for laying sewer pipes is 100 mm.

Which trap is used under Indian-style water closets?

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

Answer explanation

S traps are generally used below Indian water closets to retain water seal.

Which pipe material is commonly used in sewer lines due to its corrosion resistance?

• Cast iron
• PVC
• Concrete
• Asbestos cement

Answer explanation

PVC is durable and resists corrosion, making it suitable for sewer systems.

Which test is used to check the water-tightness of newly laid sewers?

• Mirror test
• Smoke test
• Water test
• Pressure test

Answer explanation

The water test fills the sewer line and checks for any leakage over time.

Which joint is made using a rubber gasket and is commonly used in water supply pipes?

• Flanged joint

• Bell and spigot joint
• Expansion joint

• None

Answer explanation

The bell and spigot joint uses rubber rings to create a watertight seal.