Pumps Last updated November 12, 20161. API Standard for "Centrifugal Pumps for Petroleum, Heavy Duty Chemical and Gas Industry Services" is API 674 API 617 API 610 API 6182. NPSH Stands for Negative potential solids handling Net pressure suction head Net positive suction head Normal pump suction horsepower3. Priming operation is required for Centrifugal Pump Reciprocating Pump Gear Pump Diaphragm Pump4. Gear Pump is used for High Flow Application Slurry Pumping High Viscous Application High Pressure Application5. Plunger Pump is used for High Flow Application Slurry Pumping High Viscous Application High Pressure Application6. Diaphragm Pump is used for High Flow Application Slurry Pumping High Viscous Application High Pressure Application7. Need for Relief valve in Reciprocating Pump Discharge is to Control Discharge Pressure Protect the Pump from Excess Pressure Reduce the Discharge Pressure Regulate the Discharge Flow8. In this type of Impeller the fluid leaves perpendicular to the pump shaft center line giving high head and low flow rate Radial Flow Axial Flow Mixed Flow None of the above9. Specific Speed of the Pump is Higher in Radial Flow Axial Flow Mixed Flow None of the above10. According to Centrifugal Pump Affinity Laws - Flow Does not Change with respect to Speed Changes Directly proportional to the Square of the change in Speed Changes directly proportional to the Cube of the change in Speed Changes Directly to the change in Speed11. Minimum Thermal Flow in Centrifugal Pump is Point at which highest possible efficiency is achieved Flow at which the Power consumption of the Pump is Minimum Operating Point of the Pump The lowest flow at which the pump can operate without its operation being impaired by the temperature rise o f the pumped liquid12. To avoid Cavitation of the pump Net Positive Suction Head Available must be Less than the Net Positive Suction Head Required Net Positive Suction Head Available must be equal to the Net Positive Suction Head Required Net Positive Suction Head Available must be greater than the Net Positive Suction Head Required None of the above13. In a Centrifugal Pump, Head curve Will fall for increased flow rates Starts from zero at zero flow and goes like a trajectory having a Best Efficiency point and then starts falling for increased flow rates is Simple straight line. Rises with the flow None of these14. Increase in Viscosity of the fluid in Centrifugal Pump Increases the Efficiency Decreases the Efficiency Does not affects the Efficiency None of the above15. With Increase in Operating Speed, Centrifugal Pumps NPSH requirement Increases Decreases Remains Unaltered Can either increase or decrease depending on other parameters16. Draining of Shallow pits is done using Sump pump which is a ......... Plunger Pump Single Stage Vertical Pump Multi Stage Centrifugal Pump Peristaltic Pump17. The capacity of the Centrifugal Pump is increased by increasing the Impeller Diameter Speed Number of pumps and joining them in Parallel All of the Above18. Pump used for Pumping of Shear sensitive materials is Plunger Pump Centrifugal Pump Progressive cavity pump Vacuum Pumps19. For Pumping Liquids operating near to their vapor pressure (Eg: Condensate Extraction Pumps in Power Plants ) ......... pump is used. Vertical Pump Piston Pump Diaphragm Pump Centrifugal Pump20. Most commonly used pump for Boiler feed water pumping application is Single Stage Centrifugal Pump Vertical Pump Multi Stage Centrifugal Pump Plunger Pump21. Pump which is employed for High Viscous Fuel oil Transfer Application is...... Gear Pump Plunger Pump Centrifugal Pump Vertical Pump22. For pulsation free and precise dispersion of fluids for lubrication applications ....... is installed in the discharge of the lube oil pumps Accumulator Relief Valve Restriction Orifice None of these23. Liquid evaporates when Suction Pressure is ........ Vapor pressure of the liquid at pumping temperature. Greater than Less than Equal to None of these24. Centrifugal Pump Maintains Constant ...... even the density of the pumping liquid changes. Head Pressure Flow All of the Above25. Integrally geared pumps are used for ......... application Low Head and High flow High Head and Low flow High Head and High Flow Low Head and Low Flow26. In a Rotary Lobe pump two rotors mounted on different shaft will rotate in ....... direction Same Opposite27. For Positive Displacement at Highest RPM .......... is used Plunger Pump Piston Pump Screw Pump Diaphragm Pump28. Rotary Pumps can maintain Higher Volumetric Efficiency at lower operating speeds when pumping ......... liquids High Viscous Less Viscous29. Commonly used pump for Metering pumps is ....... Gear Pump Centrifugal Pump Piston Pump None of the above30. Purpose of Foot Valve.... Installed at Suction side of suction lift pump to avoid flow reversal Installed at Discharge side to avoid flow reversal Installed to Prevent entry of foreign body to pump through suction pipe Both (a) and (c)