RMC SWITCHGEARS Interview Questions and Answers

The density of sand, water, and aggregate varies depending on their composition and temperature.

• The density of sand ranges from 1300 to 1700 kg/m³.

• The density of water is 1000 kg/m³ at 4°C.

• The density of aggregate varies depending on its size and composition.

• The density of fine aggregate ranges from 1600 to 1800 kg/m³.

• The density of coarse aggregate ranges from 1200 to 1500 kg/m³.

OPC is Ordinary Portland Cement while PPC is Portland Pozzolana Cement.

• OPC is made from raw materials like limestone and clay while PPC is made from a mixture of pozzolanic material and OPC.

• PPC has higher durability and strength compared to OPC.

• PPC is more eco-friendly as it uses industrial waste as a raw material.

• OPC is commonly used for construction of buildings and bridges while PPC is used for marine structures, hydraulic structures, and mass concreting.

• PPC has a slower r...read more

Shuttering quantity can be calculated by determining the surface area of the formwork and multiplying it by the depth of the concrete.

• Measure the length and width of the formwork

• Calculate the surface area by multiplying the length and width

• Multiply the surface area by the depth of the concrete to get the shuttering quantity

• Account for any additional formwork needed for corners or edges

Steel quantity can be calculated by using the formula: (D^2/162) x Length of steel

• Determine the diameter of the steel

• Calculate the length of the steel required

• Use the formula (D^2/162) x Length of steel to calculate the steel quantity

• Consider wastage and additional steel required for overlaps and joints

Initial setting time is the time taken by cement to harden to a certain degree.

• Initial setting time is the time taken by cement to harden to a certain degree.

• It is the time elapsed between the moment water is added to the cement and the time when the paste starts losing its plasticity.

• The initial setting time of cement is generally around 30 minutes to 1 hour.

• It is an important property of cement as it determines the time available for mixing, transporting, and placing the ce...read more

Density of RCC is around 2500 kg/m3 and PCC is around 2400 kg/m3.

• RCC stands for Reinforced Cement Concrete and PCC stands for Plain Cement Concrete.

• Density of RCC depends on the mix design and the type of aggregates used.

• Density of PCC is lower than RCC due to absence of reinforcement.

• Density of concrete is an important factor in determining its strength and durability.

Lapping provides a smooth surface finish to the column.

• Clean the column thoroughly before lapping.

• Apply a lapping compound to the column surface.

• Use a lapping tool to rotate and move up and down the column.

• Continue lapping until the desired surface finish is achieved.

• Clean the column again after lapping to remove any residue.