Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

high initial and maintenance cost

For starting an axial flow pump, its delivery valve should be

depends on starting condition and flow desired

The efficiency of a centrifugal pump is maximum when its blades are

bent forward first and then backward

bent backward first and then forward.

In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

trimming the impeller size to the required size by machining

some other alterations in the impeller

Indicator diagram of a reciprocating pump is a graph between

pressure in cylinder vs swept volume

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

relative velocity of flow at inlet.

Runaway speed of a hydraulic turbine is

the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

the speed at which turbine runner will be damaged

the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

the speed corresponding to maximum overload permissible

A turbine pump is basically a centrifugal pump equipped additionally with

totally submerged operation facility.

In reaction turbine, draft tube is used

to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

to transport water downstream without eddies

to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

resultant force and tangential force.

Francis turbine is best suited for

medium head application from 24 to 180 m

low head installation up to 30 m

high head installation above 180 m

The flow rate in gear pump

more or less remains constant with in-crease in pressure

increases with increase in pressure

decreases with increase in pressure

more or less remains constant with in-crease in pressure

Impulse turbine is generally fitted

about 2.5 m above the tail race to avoid cavitation

about 2.5 m below the tail race to avoid cavitation.

The discharge through a reaction turbine with increase in unit speed

first increases and then decreases

first decreases and then increases.

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

combination of axial and radial.

Hydraulic Machines MCQ Interview Questions and Answers Quiz

32.

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

of such a size that it delivers unit dis-charge at unit head

of such a size that it delivers unit dis-charge at unit power

of such a size that it requires unit power per unit head

of such a size that it produces unit horse power with unit head

none of the above.

1. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

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

3. Head developed by a centrifugal pump depends on

4. For starting an axial flow pump, its delivery valve should be

5. The efficiency of a centrifugal pump is maximum when its blades are

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

7. Centrifugal pump is started with its delivery valve

8. Axial flow pump is started with its delivery valve

9. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

10. One horsepower is equal to

11. Multistage centrifugal pumps are used to obtain

12. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

13. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

14. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

15. The horse power required in above case will be

16. Low specific speed of a pump implies it is

17. The optimum value of vane exit angle for a centrifugal pump impeller is

18. In a centrifugal pump, the liquid enters the pump

19. For small discharge at high pressure, following pump is preferred

20. In centrifugal pumps, maximum efficiency is obtained when the blades are

21. Motion of a liquid in a volute casing of a centrifugal pump is an example of

22. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred

23. Medium specific speed of a pump implies it is

24. High specific speed of a pump implies it is

25. Indicator diagram of a reciprocating pump is a graph between

26. Low specific speed of turbine implies it is

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

28. Runaway speed of a hydraulic turbine is

29. The maximum number of jets generally employed in impulse turbine without jet interference is

30. Medium specific speea of turbine implies it is

31. High specific speed of turbine implies it is

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

33. Puck up the wrong statement about centrifugal pump

34. A turbine pump is basically a centrifugal pump equipped additionally with

35. Casting of a centrifugal pump is designed so as to minimize

36. In reaction turbine, draft tube is used

37. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

38. Francis turbine is best suited for

39. The flow rate in gear pump

40. Impulse turbine is generally fitted

41. Francis, Kaplan and propeller turbines fall under the category of

42. Reaction turbines are used for

43. The discharge through a reaction turbine with increase in unit speed

44. The angle of taper on draft tube is

45. Specific speed for reaction turbines ranges from

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

47. Which place in hydraulic turbine is most susceptible for cavitation

48. Air vessels in reciprocating pump are used to

49. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

50. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

51. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

52. According to fan laws, for fans having constant wheel diameter, the pressure varies

53. According to fan laws, for the fans having constant wheel diameters, the power demand varies

54. According to fan laws, at constant speed and capacity, the pressure and power vary

55. According to fan laws, at constant pressure, the speed capacity and power vary

56. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

57. Pressure intensifier increases the pressure in proportion to

58. A hydraulic accumulator normally consists of

59. A hydraulic intensifier normally consists of

60. Hydraulic accumulator is used for

61. Maximum impulse will be developed in hydraulic ram when

Time

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1.

Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

2.

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

3.

Head developed by a centrifugal pump depends on

4.

For starting an axial flow pump, its delivery valve should be

5.

The efficiency of a centrifugal pump is maximum when its blades are

6.

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

7.

Centrifugal pump is started with its delivery valve

8.

Axial flow pump is started with its delivery valve

9.

When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

10.

One horsepower is equal to

11.

Multistage centrifugal pumps are used to obtain

12.

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

13.

In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

14.

If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

15.

The horse power required in above case will be

16.

Low specific speed of a pump implies it is

17.

The optimum value of vane exit angle for a centrifugal pump impeller is

18.

In a centrifugal pump, the liquid enters the pump

19.

For small discharge at high pressure, following pump is preferred

20.

In centrifugal pumps, maximum efficiency is obtained when the blades are

21.

Motion of a liquid in a volute casing of a centrifugal pump is an example of

22.

For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred

23.

Medium specific speed of a pump implies it is

24.

High specific speed of a pump implies it is

25.

Indicator diagram of a reciprocating pump is a graph between

26.

Low specific speed of turbine implies it is

27.

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

28.

Runaway speed of a hydraulic turbine is

29.

The maximum number of jets generally employed in impulse turbine without jet interference is

30.

Medium specific speea of turbine implies it is

31.

High specific speed of turbine implies it is

32.

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

33.

Puck up the wrong statement about centrifugal pump

34.

A turbine pump is basically a centrifugal pump equipped additionally with

35.

Casting of a centrifugal pump is designed so as to minimize

36.

In reaction turbine, draft tube is used

37.

Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

38.

Francis turbine is best suited for

39.

The flow rate in gear pump

40.

Impulse turbine is generally fitted

41.

Francis, Kaplan and propeller turbines fall under the category of

42.

Reaction turbines are used for

43.

The discharge through a reaction turbine with increase in unit speed

44.

The angle of taper on draft tube is

45.

Specific speed for reaction turbines ranges from

46.

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

47.

Which place in hydraulic turbine is most susceptible for cavitation

48.

Air vessels in reciprocating pump are used to

49.

Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

50.

Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

51.

According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

52.

According to fan laws, for fans having constant wheel diameter, the pressure varies

53.

According to fan laws, for the fans having constant wheel diameters, the power demand varies

54.

According to fan laws, at constant speed and capacity, the pressure and power vary

55.

According to fan laws, at constant pressure, the speed capacity and power vary

56.

According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

57.

Pressure intensifier increases the pressure in proportion to

58.

A hydraulic accumulator normally consists of

59.

A hydraulic intensifier normally consists of

60.

Hydraulic accumulator is used for

61.

Maximum impulse will be developed in hydraulic ram when