PNC Infratech Water Treatment Plant Engineer Interview Questions and Answers

Only 1 set of cube sample is taken at a casting of concrete of 5 or less than 5 Meter cube to save cost and time.

• Taking multiple samples would increase the cost of testing.

• The strength of concrete is usually consistent within a small volume.

• ASTM C31 allows for only 1 set of samples for small volume concrete.

• If the first set of samples fails, additional samples can be taken for verification.

Slump for casting of concrete is measured using a cone. Slump value may decrease as height increases in high rise buildings.

• Slump is measured using a cone and the difference between the height of the cone and the height of the concrete after it settles is the slump value.

• As height increases in high rise buildings, the pressure on the concrete increases, which may cause the slump value to decrease.

• To maintain the desire...read more

The right bonding agent for recasting of concrete after rain would be a polymer-modified cementitious bonding agent.

• The surface should be cleaned and dried before applying the bonding agent.

• The bonding agent should be applied in a thin layer using a brush or roller.

• The recasting of concrete should be done within the specified time frame mentioned by the bonding agent manufacturer.

• Examples of polymer-modified cementitio...read more

Shear force is the force perpendicular to the beam and bending moment is the torque that causes bending of the beam.

• Shear force is calculated by finding the algebraic sum of all the forces acting on one side of the beam.

• Bending moment is calculated by finding the algebraic sum of all the moments acting on one side of the beam.

• Shear force and bending moment diagrams are used to visualize the distribution of these forces...read more

CMDI and HDPE are two different types of plastic materials used in various applications.

• CMDI stands for Chlorinated Polyethylene Modified Polyethylene and is a thermoplastic elastomer used in wire and cable insulation, automotive parts, and roofing membranes.

• HDPE stands for High-Density Polyethylene and is a thermoplastic polymer used in packaging, pipes, and construction materials.

• CMDI has better resistance to chemica...read more