1. The movement of ships and boats in water is due to
Correct : B. Jet propulsion
2. The inlet orifices are at what angle with the motion of the ship?
Correct : D. 90
3. Which among the following is a formula for force when it acts perpendicular to the direction of flow?
Correct : A. pav2 SinθCosθ
4. Which among the following is the formula for relative velocity?
Correct : A. V + u
5. Component of velocity in direction of jet is -VCosθ. What does ‘θ’ indicate?
Correct : C. Angle made by jet and inlet tip
6. Principle of fluid mechanics works on the utilization of
Correct : C. Work
7. The force analysis on a curved vane is understood using
Correct : A. Velocity triangles
8. How is absolute velocity at inlet denoted?
Correct : B. V1
9. The relative velocity is obtained by the equation
Correct : A. u – V1
10. If the friction is neglected, then
Correct : C. Vr1 = Vr2
11. If the pressure remains a constant, then
Correct : C. Vr1 = Vr2
12. Jet propulsion of ship is less efficient than screw propeller due to
Correct : C. Frictional losses
13. Jet propulsion of ship in a very shallow water is needed to
Correct : B. Avoid damage of the propeller
14. A turbojet does not consist of which of the following component?
Correct : D. Air filter
15. Which among the following is not a type of jet engine?
Correct : D. Propulsive jet
16. Hydraulic energy is converted into another form of energy by hydraulic machines. What form
of energy is that?
Correct : A. Mechanical Energy
17. Which principle is used in Hydraulic Turbines?
Correct : B. Newton’s second law
18. Buckets and blades used in a turbine are used to:
Correct : A. Alter the direction of water
19. is the electric power obtained from the energy of the water.
Correct : D. Hydroelectric power
20. Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft?
Correct : A. Mechanical Energy
21. Hydraulic Machines fall under the category :
Correct : D. Roto-dynamic machinery
22. Which kind of turbines changes the pressure of the water entered through it?
Correct : A. Reaction turbines
23. Which type of turbine is used to change the velocity of the water through its flow?
Correct : C. Impulse turbines
24. Which type of turbine is a Francis Turbine?
Correct : C. Reaction turbine
25. How many types of Reaction turbines are there?
Correct : A. 5
26. Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be?
Correct : D. 6
27. The overall efficiency of a reaction turbine is the ratio of
Correct : A. Actual work available at the turbine to the energy imparted to the wheel
28. In a reaction turbine, the draft tube is used to
Correct : A. To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race
29. In reaction turbine hydraulic efficiency is_
Correct : B. Ratio of work done on the wheel to energy that is supplied to the turbine.
30. Consider an inward flow reaction turbine, here, water
Correct : B. Enters the wheel at the outer periphery and then flows towards the centre of the wheel
31. The working of which of the following hydraulic units is based on Pascal’s law?
Correct : C. Hydraulic press
32. Which kind of turbine is a Pelton Wheel turbine?
Correct : A. Tangential flow turbine.
33. IN what type of turbine water enters in radial direction and leaves axial direction?
Correct : D. Mixed flow turbine
34. How many types of turbines can you classify on the basis of direction of flow through runner?
Correct : C. 4
35. Into how many types can you classify radial flow turbines?
Correct : D. 2
36. Into how many types can you classify turbines on basis of head at inlet?
Correct : A. 3
37. Among the following which turbine requires more head?
Correct : A. Pelton Turbine
38. Total head of turbines is_
Correct : D. Pressure head + Kinetic head + Static head
39. Head under which Kaplan turbine is operated
Correct : A. 10-70 meters
40. Head under which Francis turbine is operated
Correct : D. 40 -600 meters
41. The turbine is preferred for 0 to 25 m head of water?
Correct : B. Kaplan turbine
42. Under what head is Pelton turbine operated?
Correct : B. 15-2000 meters
43. is difference between head race and tail race
Correct : A. Gross head
44. The head available at inlet of turbine
Correct : C. Net head
45. Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock and” k” is constant and its value is
Correct : C. 4
46. The difference between gross head and friction losses is
Correct : A. Net head
47. is defined as ratio between power delivered to runner and power supplied at inlet of turbine.
Correct : C. Hydraulic efficiency
48. Which among the following which is not an efficiency of turbine?
Correct : D. Electrical efficiency
49. The ratio of power at the shaft of turbine and power delivered by water to runner is known as?
Correct : A. Mechanical efficiency
50. The product of mechanical efficiency and hydraulic efficiency is known as?
Correct : D. Overall efficiency
51. Among the following which turbine has highest efficiency?
Correct : A. Kaplan turbine
52. In the expression for overall efficiency of turbine, which is p/(k*g*q*h), where “k” is known as
Correct : A. Density of liquid
53. The expression for maximum hydraulic efficiency of pelton turbine is given by?
Correct : A. (1+cos k)/2 where k is outlet blade angle
54. To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be
Times the inlet velocity of jet.
Correct : A. Half
55. Among the following which turbine has least efficiency?
Correct : A. Pelton turbine
56. A hydraulic coupling belongs to the category of
Correct : D. Energy transfer machines
57. The electric power which is obtained from hydraulic energy
Correct : D. Hydroelectric power
58. At present which is cheapest means of generating power_
Correct : C. Hydroelectric power
59. Pipes of largest diameter which carry water from reservoir to the turbines is known as_
Correct : D. Pen stock
60. Pen stocks are made up of
Correct : A. Steel
61. is an inward radial flow reaction turbine?
Correct : C. Francis turbine
62. The important type of axial flow reaction turbines are
Correct : D. Propeller and Kaplan turbines
63. is a axial flow reaction turbines, if vanes are fixed to hub of turbine
Correct : A. Propeller turbine
64. Francis and Kaplan turbines are known as
Correct : B. Reaction turbine
65. Specific speed of reaction turbine is between?
Correct : B. 10 and 100
66. Impulse turbine is generally fitted at
Correct : B. Above the tail race
67. Hydraulic turbines are classified based on
Correct : D. Energy available, Direction of flow, Head at inlet.
68. Impulse turbine and reaction turbine are classified based on ?
Correct : A. Type of energy at inlet
69. Tangential flow, axial flow, radial flow turbines are classified based on?
Correct : B. Direction of flow through runner
70. High head, low head and medium head turbines are classified based on
Correct : C. Head at inlet of turbine
71. Low specific speed, high specific speed and medium specific speed are classified based on
Correct : D. Specific speed of turbine
72. If energy available at inlet of turbine is only kinetic energy then it is classified based on
Correct : A. Type of energy at inlet
73. If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as
Correct : D. Mixed flow turbine
74. Pelton turbine is operated under
Correct : B. High head and low discharge
75. Kaplan turbine is operated under
Correct : A. Low head and high discharge
76. Medium specific speed of turbine implies
Correct : C. Francis turbine
77. High specific speed of turbine implies that it is_
Correct : D. Kaplan turbine
78. Velocity triangles are used to analyze
Correct : D. Flow of water, measure of discharge, angle of deflection.
79. In which of following turbine inlet and outlet blade velocities of vanes are equal?
Correct : C. Pelton turbine
80. Tangential velocity of blade of Pelton wheel is proportional to
Correct : A. Speed of wheel
81. In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude?
Correct : A. Pelton turbine
82. In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is
Correct : A. x- component of V(r2) – blade velocity
83. In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” then outlet whirl velocity of jet is
Correct : C. Blade velocity – x- component of V (r2)
84. In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is
Correct : D. Zero
85. In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is
Correct : A. Difference between inlet jet velocity and blade velocity
86. In Pelton wheel if angle of deflection is not mentioned then we assume it as_
Correct : C. 165 degrees
87. The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression
Correct : A. [Vw1+Vw2] u/g
88. In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as
Correct : B. Runner power
89. In Pelton turbines the expression for power delivered at inlet to runner is given by
Correct : C. W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g
90. Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94?
Correct : C. 187Kw
91. 10.The expression for water power in Pelton wheel is
Correct : A. (P*g*Q*H) Kw
92. The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to
Correct : A. V/2
93. In Pelton turbine is defined as ratio between power delivered to runner and power supplied at inlet of turbine
Correct : C. Hydraulic efficiency
94. In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as
Correct : D. Overall efficiency
95. In Pelton is ratio of volume of water actually striking the runner and volume of water supplied to turbine?
Correct : B. Volumetric efficiency
96. In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is
Correct : D. Overall efficiency
97. The expression for maximum hydraulic efficiency of Pelto turbine is given by
Correct : A. (1+cos k)/2 where k is outlet blade angle
98. In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as
Correct : B. Density of liquid
99. Design of Pelton wheel means the following data is to be determined.