D59 MASTER THE DAY

Which joint uses a collar filled with 1:1 cement mortar to connect plain-ended RCC pipes?

• Flanged joint
• Collar joint
• Screwed joint
• Simplex joint

Answer explanation

Collar joint is used for plain-ended RCC pipes and uses a 1:1 cement mortar filling.

What is the purpose of a flanged joint in pipelines?

• Permanent connection
• Used in curved areas
• For high pressure and detachable connection
• Used only in water supply

Answer explanation

Flanged joints are used for high-pressure applications and can be easily dismantled.

What material is used in the collar joint for sealing?

• Bitumen
• Lime mortar
• Cement mortar (1:1)
• Asphalt

Answer explanation

A rich 1:1 cement mortar is used to seal collar joints in RCC pipes.

Which joint consists of two flanges joined by bolts with a rubber gasket in between?

• Spigot and socket joint
• Flanged joint
• Expansion joint
• Simplex joint

Answer explanation

Flanged joints consist of two flanges bolted with a rubber gasket in between.

Which pipe joint is best suited where pipe vibrations are expected?

• Simplex joint
• Flanged joint
• Dresser coupling
• Socket joint

Answer explanation

Dresser couplings are designed to accommodate pipe vibrations and minor misalignments.

Assertion: Dresser coupling is used where pipe vibration is expected. Reason: It includes middle rings, gaskets, and followers to provide flexibility.

• Both A and R are true and R is the correct explanation
• Both A and R are true but R is not the correct explanation
• A is true but R is false
• A is false but R is true

Answer explanation

Dresser coupling is flexible and used in vibrating conditions due to its special components.

Which joint is commonly used in CI pipes with threaded ends?

• Simplex joint
• Screwed joint
• Dresser coupling
• Collar joint

Answer explanation

Screwed joints are suitable for small diameter CI pipes with threading at ends.

Which type of pipe joint is most flexible and allows slight movement?

• Socket joint
• Collar joint
• Simplex joint
• Expansion joint

Answer explanation

Expansion joints allow movement due to temperature changes or pipe expansion.

Which of the following joints is preferred in temporary water supply pipe lines?

• Simplex joint
• Flanged joint
• Collar joint
• Socket joint

Answer explanation

Flanged joints are easy to dismantle and hence preferred for temporary pipelines.

Which component of dresser coupling applies pressure to the gasket?

• Middle ring
• Rubber sleeve
• Follower ring
• Packing plate

Answer explanation

The follower ring in a dresser coupling presses the gasket to ensure leak-proof sealing.