2. The ratio of pitch diameter of Pelton wheel to diameter of jet is known as
Correct : B. Jet ratio
3. Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm.
Correct : A. 1.25 meters
4. The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is
Correct : B. 85mm
5. In most of cases the value of jet ratio is
Correct : C. 12
6. Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet)
Correct : A. 15 + D/2d
7. is obtained by dividing total rate of flow through the turbine by rate of flow through single jet.
Correct : A. Number of jets
8. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets.
Correct : D. 425mm
9. If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is
Correct : D. 102mm
10. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately
Correct : D. 25
11. Radial flow reaction turbines are those turbines in which water flows
Correct : A. Radial direction
12. Main parts of radial flow reaction turbines are
Correct : D. All of the mentioned
13. Radial flow reaction turbines contain spiral casing which area
Correct : B. Gradually decreases
14. consists of stationary circular wheel all around the runner of turbine
Correct : B. Guide mechanism
15. The casing of radial flow reaction turbine is made of spiral shape, so that water may
enter the runner
Correct : D. Constant velocity
16. allow the water to strike the vanes fixed on runner without shock at inlet
Correct : B. Guide vanes
17. Runner blades are made up of
Correct : A. Cast steel
18. The pressure at the exit of runner of reaction turbine is generally than atmospheric pressure
Correct : B. Lesser
19. is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race
Correct : C. Draft tube
20. and of radial flow reaction turbine are always full of water.
Correct : A. Casing and runner
21. governs the flow of water entering the runner blades.
Correct : B. Guide vanes
22. Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner_
Correct : B. Radially inward
23. Which of following is inward radial flow reaction turbine?
Correct : B. Francis turbine
24. In Inward radial flow reaction turbine which is not required?
Correct : D. Breaking jet
25. The main difference between reaction turbine and inward radial flow reaction turbine is
water flows
Correct : B. Radially inward
26. In Inward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as
Correct : B. Flow ratio
27. In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity
Correct : A. Speed ratio
28. In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is
Correct : B. Radial outlet discharge
29. In which of following turbine whirl component is zero?
Correct : B. Inward radial flow reaction turbine
30. Discharge in inward flow reaction turbine
Correct : B. Decreases
31. Speed control of Outward flow reaction turbine is
Correct : B. Moderate
32. Centrifugal head in inward flow reaction turbine
Correct : B. Decreases
33. Tendency of wheel to race is almost nil in turbine
Correct : A. Inward flow reaction turbine
34. The formation of vapour cavities is called
Correct : B. Cavitation
35. What is the degree of reaction denoted as?
Correct : B. R
36. Voids are created due to
Correct : C. Liquid free layers
37. Cavitation usually occurs due to the changes in
Correct : A. Pressure
38. Degree of reactions are most commonly used in
Correct : A. Turbomachinery
39. At high pressure, the voids can generate
Correct : C. Shock waves
40. Voids that implode near metal surface develops a
Correct : B. Cyclic stress
41. In case of gas turbines and compressors, degree of reaction is
Correct : C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage
42. The velocities of the blade angles can be found out using
Correct : C. Velocity triangles
43. Which among the following velocities cannot be found using the velocity triangle?
Correct : D. Parabolic
44. Hydrodynamic cavitation is due to the process of
Correct : A. Vaporisation
45. The process of bubble generation leads to
Correct : C. High energy densities
46. Degree of reaction turbine is the ratio of?
Correct : A. Pressure energy to total energy
47. Which of these options are best suited for the total energy change inside the runner per unit weight?
Correct : B. Degree of reaction
48. Which of these ratios are termed to be hydraulic efficiency?
Correct : D. Runner power to water power
49. When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed?
Correct : B. Pressure energy
50. For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum?
Correct : A. 90
51. Discharge through a reaction flow reaction turbine is given by, Q =
Correct : A. Pi*d*b*Vf1
52. When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration?
Correct : A. Pi*d – n*t
53. means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero.
Correct : D. Radial discharge
54. In a Francis turbine, degree of reaction lies between
Correct : A. 0 and 1
55. The water from penstocks enters the which is spiral in shape which the area of cross section of casing goes on decreasing gradually
Correct : C. casing
56. If the water flows from inwards to outwards, the turbine is known as
Correct : D. Outward flow turbine
57. In general, reaction turbines consist of which types of energies?
Correct : C. kinetic energy and pressure energy
58. is a circular wheel on which a series of smooth, radial curved vanes are fixed.
Correct : B. Runner
59. In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as
Correct : B. Flow ratio
60. In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is
Correct : A. Speed ratio
61. Discharge in an outward flow reaction turbine
Correct : A. Increases
62. An outward radial reaction turbine has
Correct : A. u1 < u2
63. An outward flow reaction turbine,
Correct : B. D1 < D2
64. is ratio of pressure energy change inside runner to total energy change inside runner
Correct : A. Degree of reaction
65. Degree of reaction for impulse turbine
Correct : A. 0
66. Degree of reaction for reaction turbine is
Correct : A. 1- cot x /2(cot x –cot y )
67. A turbine is a
Correct : A. Rotary mechanical device
68. Turbine converts
Correct : B. Energy to work
69. Turbine extracts energy from
Correct : C. Fluid flow
70. Inward flow reaction turbine enter through
Correct : A. Outer periphery
71. A turbine is a
Correct : A. Turbomachinery
72. Centrifugal flow is imparted when the_
Correct : C. Efficiency is 100 percent
73. Where is the turbine not used?
Correct : A. Solar power
74. In an inward flow reaction turbine the discharge
Correct : B. Decreases
75. In impulse turbines with moving blades, there is no in blades of the turbine.
Correct : A. Pressure change
76. In impulse turbines with stationary blades, there is in blades of the turbine.
Correct : A. Pressure change
77. In an outward flow reaction turbine the discharge
Correct : A. Increases
78. Before reaching the turbine, the acceleration of the fluid takes place through the
Correct : B. Nozzle
79. The Pelton wheel extracts energy from
Correct : B. Moving fluid
80. The outward radial flow reaction turbine is a turbine in which direction of water flow is
Correct : C. Radially outward
81. The energy available at inlet for outward reaction flow turbine is
Correct : D. Pressure energy and Kinetic energy
82. Centrifugal head in Outward flow reaction turbine
Correct : A. Increases
83. Discharge in outward flow reaction turbine
Correct : A. Increases
84. Speed control of Outward flow reaction turbine is
Correct : D. Very difficult
85. Tendency of wheel to race is predominant in turbine
Correct : B. Outward flow reaction turbine
86. Outward flow reaction turbine will quite suitable for_
Correct : B. Medium head
87. In outward flow reaction turbine tangential velocity at inlet is always_ than outlet velocity.
Correct : B. Less
88. In outward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at inlet is
Correct : A. Radial inlet discharge
89. The main difference between reaction turbine and outward radial flow reaction turbine is water flows
Correct : B. Radially inward
90. In outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as
Correct : B. Flow ratio
91. Conical diffuser draft tube is also called
Correct : A. Straight divergent tube
92. The simple elbow draft tube is placed close to the_
Correct : B. Tail race
93. Turbine that consists of moving nozzles and with fixed nozzles is called as
Correct : D. Reaction turbine
94. An example of reaction turbine is_
Correct : A. Parsons turbine
95. When we arrange turbine blades in multiple stages it is called
Correct : C. Compounding
96. Compounding is needed to
Correct : D. Increase efficiency
97. Which among the following is not a type of compounding?
Correct : B. Temperature
98. Newtons second law describes the transfer of energy through impulse turbines.
Correct : A. True
99. Inner radial flow extracts energy from
Correct : B. Moving fluid
100. Reaction turbines develop torque by reacting to the gas or fluids pressure or mass.