WPIL Site Engineer Interview Questions and Answers

Q1. Pipline, laying and jointing, trench excavation and restoration and testing, different type of pipes and class, specification of trench and bach filling
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Q2. Different types of pipes
Ans. 
There are various types of pipes used in construction such as PVC, HDPE, GI, CPVC, PEX, etc.
• PVC pipes are commonly used for water supply and drainage systems

• HDPE pipes are used for gas and water supply systems

• GI pipes are used for water supply and irrigation systems

• CPVC pipes are used for hot and cold water supply systems

• PEX pipes are used for radiant heating and cooling systems
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Q3. Specification of trench
Ans. 
Trench specification includes depth, width, slope, and backfill material.
• Depth of trench should be as per design and should not exceed the specified limit.

• Width of trench should be sufficient for workers to move and work comfortably.

• Slope of trench should be maintained to prevent collapse and ensure worker safety.

• Backfill material should be of appropriate quality and compacted properly.

• Trench should be properly marked
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Q4. Hydrotesting of pipeline
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Hydrotesting is a process of testing pipelines for leaks and strength by filling them with water or other fluids.
• The pipeline is filled with water or other fluids under pressure to check for leaks.

• The pressure is maintained for a specified duration to check the strength of the pipeline.

• The test is conducted before the pipeline is put into service to ensure its integrity.

• Hydrotesting is also done periodically to check f...read more
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Hydrtesting of pipeline, construction of Ground level reservior and installation of specialis