FRIDAY WEEKLY EXAM (27/06/2025)

Which pipe joint is most suitable for temporary installations where frequent dismantling is required?

• Flexible joint
• Flanged joint
• Expansion joint
• Screwed joint

Answer explanation

Flanged joints are used in metal pipes where dismantling is needed, making them suitable for temporary setups.

The most commonly used sewer material for house or lateral sewers, which is cheap and durable but heavy and brittle, is:

• Vitrified clay pipe
• Cast iron pipe
• RCC pipe
• Asbestos cement pipe

Answer explanation

Vitrified clay pipes are cheap, hydraulically efficient, but heavy and brittle, commonly used in house sewers.

Which sewer section is preferred for storm water drainage and is easy to construct and economical?

• Box section
• Egg-shaped section
• Circular section
• Horse-shoe section

Answer explanation

Box section sewers are easier to construct and economical, commonly used for large storm water drainage systems.

Which of the following is NOT a function of a trap in house drainage?

• Providing water seal
• Preventing foul gas entry
• Collecting waste water
• Admitting storm water

Answer explanation

Traps do not serve the function of admitting storm water; their purpose is to maintain a water seal and prevent foul gas entry.

In sewer maintenance, which test uses a smooth ball passed through the sewer to detect blockages?

• Smoke test
• Ball test
• Air test
• Mirror test

Answer explanation

Ball test is used by passing a smooth ball through the sewer to check for obstructions and ensure clear flow.

What is the minimum recommended internal diameter for sewers according to standards?

• 10 cm
• 15 cm
• 30 cm
• 45 cm

Answer explanation

The minimum recommended internal diameter for sewers is 15 cm to ensure effective flow and maintenance access.

Match the following sewer components with their specific characteristics: A. Inverted Siphon B. Drop Manhole C. Flushing Tank D. Lamp Hole 1. Allows inspection using light insertion 2. Provides vertical connection between high and low level sewers 3. Enables sewage to pass under obstacles under pressure 4. Clears sewers near dead ends with stored water

• A-3, B-2, C-4, D-1
• A-4, B-3, C-2, D-1
• A-1, B-4, C-3, D-2
• A-2, B-1, C-4, D-3

Answer explanation

Inverted siphon passes sewage under obstacles (A-3), Drop manhole connects different levels (B-2), Flushing tanks clear dead ends (C-4), Lamp holes allow light-based inspection (D-1).

Which type of rail is known for having the best stability and is most commonly used in India?

• Flat footed rail
• Double headed rail
• Bull headed rail
• Vignoles rail

Answer explanation

Flat footed rails are the most commonly used in India due to their excellent stability.

What is the main function of a fish plate in a railway track?

• To maintain gauge distance
• To absorb shocks and vibrations
• To connect two rails in both planes
• To provide vertical support to rails

Answer explanation

Fish plates connect two rails in horizontal and vertical planes, ensuring track continuity.

Which bitumen type is preferred for use in cold weather due to its low viscosity?

• Rapid curing bitumen
• Slow curing bitumen
• Cut back bitumen
• Medium curing bitumen

Answer explanation

Cut back bitumen is preferred in cold weather as it has reduced viscosity due to volatile solvents.