Deccan Fine Chemicals Senior Instrument Engineer Interview Questions and Answers

Star/Delta starter is used to reduce the starting current of a motor.

• Star connection provides high starting torque but high starting current

• Delta connection provides low starting torque but low starting current

• Star/Delta starter uses both connections to reduce starting current and provide sufficient starting torque

• Used for large motors to prevent damage to motor and electrical system

CV calculation of control valve involves determining the valve's flow coefficient.

• CV is calculated using the formula: CV = Q / (SG * sqrt(dP))

• Q is the flow rate, SG is the specific gravity of the fluid, and dP is the pressure drop across the valve.

• CV is used to select the appropriate valve size for a given application.

• Factors such as valve type, trim size, and pressure drop affect the CV value.

• CV calculation is importa...read more