10+ Renganayagi Varatharaj College of Engineering Interview Questions and Answers

To edit a rung in AB PLC software RS Logix, follow these steps:

• Open the RS Logix software and select the project

• Navigate to the ladder logic editor and locate the rung to be edited

• Double-click on the rung to open the rung editor

• Make the necessary changes to the rung

• Save the changes and download the updated program to the PLC

Close loops in CFBC boiler operation are used for controlling various parameters.

• Close loop for controlling bed temperature

• Close loop for controlling air flow rate

• Close loop for controlling fuel feed rate

• Close loop for controlling steam pressure

• Close loop for controlling flue gas temperature

Turbine protection system is a safety system that protects the turbine from damage during abnormal conditions.

• It monitors various parameters like temperature, pressure, vibration, and speed.

• It triggers alarms and trips the turbine if any parameter exceeds the safe limit.

• It also includes emergency shutdown systems to prevent catastrophic failures.

• Examples of protection systems include overspeed protection, low oil pressure protection, and high exhaust temperature protection.

Transformer losses include copper losses and iron losses.

• Copper losses are caused by the resistance of the copper windings and increase with the square of the current flowing through the transformer.

• Iron losses, also known as core losses, are caused by hysteresis and eddy currents in the transformer core material.

• Other losses may include stray losses, dielectric losses, and mechanical losses.

• Total losses in a transformer are the sum of copper losses and iron losses.

The type of VCB coil is generally a copper coil.

• VCB coils are typically made of copper due to its high conductivity and durability

• Copper coils are preferred for VCBs as they provide efficient current flow and are resistant to heat

• Some VCB coils may also be made of aluminum, but copper is more common

There are different types of cement used for various purposes such as construction, repair, and decoration.

• Ordinary Portland Cement (OPC) is used for general construction purposes.

• Rapid Hardening Cement (RHC) is used for precast concrete, road construction, and repair work.

• White Cement is used for decorative purposes such as flooring, tiles, and sculptures.

• Low Heat Cement (LHC) is used for massive concrete structures such as dams and bridges.

• Portland Pozzolana Cement (PPC) is...read more

Safety in plant involves implementing measures to prevent accidents and ensure a safe working environment for employees.

• Implementing safety protocols and procedures

• Providing safety training to employees

• Regular safety inspections and audits

• Maintaining safety equipment and gear

• Promoting a safety culture among employees