Hydraulic Machines Multiple Choice Questions and Answers

11. In a reciprocating pump, air vessels are used to

1. Reduce the flow
2. Increase the delivery head
3. Smoothen the flow
4. Reduce the acceleration head

12. In a centrifugal pump casing, the flow of water leaving the impeller, is

1. rectilinear flow
2. radial flow
3. free vortex motion
4. forced vortex

13. Pressure intensifier increases the pressure in proportion to

1. ratio of diameters
2. square of ratio of diameters
3. inverse ratio of diameters
4. square of inverse ratio of diameters

14. In axial flow fans and turbines, fluid enters and leaves as follows

1. radially, axially
2. axially, radially
3. axially, axially
4. radially, radially

15. In a centrifugal pump casing, the flow of water leaving the

1. radial
2. radial
3. centrifugal
4. vortex

16. Low specific speed of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

17. Medium specific speea of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

18. High specific speed of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

19. The specific speed of turbine is defined as the speed of a unit

1. of such a size that it delivers unit dis-charge at unit head
2. of such a size that it delivers unit dis-charge at unit power
3. of such a size that it requires unit power per unit head
4. of such a size that it produces unit horse power with unit head

20. Any change in load is adjusted by adjusting following parameter on turbine

1. net head
2. absolute velocity
3. blade velocity
4. flow