Sewerage Systems MCQ with answer and solution

Concept

Collar joints are used for large-diameter sewers (above 600 mm). Spigot and socket joints are used for smaller pipes.

Step-by-step solution

1. Spigot and socket joints are common for small-diameter sewers. 2. For large-diameter concrete sewers (above 600 mm), collar joints are preferred. 3. Bandage joints are mainly used for repairs or special cases. 4. So the answer is collar joint.

Explanation

For large concrete sewer pipes, a collar is placed over the two pipe ends and the gap is filled with mortar. This gives a strong joint for big pipes. Spigot and socket joints suit smaller pipes.

Why the other options are wrong

A: Spigot and socket joints are preferred for smaller diameters. C: Bandage joints are used for repairs or special cases, not as the standard for large sewers. D: Mechanical joints are mainly used for cast iron pressure pipes.

Shortcut

Large sewer (>600 mm) = collar joint.

Common mistake

Choosing spigot and socket because it is the most common sewer joint.