1. The flow rate of steam is controlled by regulating the_
Correct : B. Pressure
2. If Velocity, pressure, density etc., do not change at a point with respect to time, flow is called
Correct : D. steady
3. If velocity, pressure, density etc., change at a point with respect to time, flow is called
Correct : C. unsteady
4. If the velocity in a fluid flow does not change with respect to length of direction of flow, it is called
Correct : B. uniform flow
5. If the velocity in a fluid flow change with respect to length of direction of flow, it is called
Correct : D. none of the above
6. If the density of the fluid is constant from point to point in a flow region, it is called
Correct : B. incompressible flow
7. If the density of the flow changes from point to point in a flow region, it is called
Correct : D. compressible
8. Chezy’s Formula is given as
Correct : B. v= c √(rs)
9. The discharge through the trapezoidal channel is maximum when
Correct : A. half of the top width= sloping side
10. The maximum velocity through a circular channel when depth flow is equal to
Correct : C. 0.81 x diameter
11. The maximum discharge through a circular channel takes place when depth of flow is equal to
Correct : A. 0.95 x diameter
12. The most economical section is one for which a given cross sectional area, the slope of the bed (s)
and coefficient of resistance has
Correct : B. maximum discharge
13. A hydraulically efficient trapezoidal section has a side slopes of 2 horizontal :1 vertical. The ratio of
the bed width to depth B/y in this channel is
Correct : C. 0.472
14. al to 2m and 1m respectively. If the flow is uniform and the value of Chezy’s constant is 60, the
discharge through the channel is
Correct : B. 1.5m3/s
15. A hydraulic jump takes place in a horizontal rectangular channel from a depth of 0.20m to 2.40m The
discharge in the channel in m3/s per meter width is…
Correct : A. 2.47
16. A hydraulic jump occurs at the top of a spillway. The depth before jump is 0.2m. The sequent depth
is 3.2m. What is the energy dissipated in m (approximate)?
Correct : B. 10.5
17. The hydraulic jump always occurs from
Correct : D. below critical depth to above critical depth
18. In a horizontal rectangular channel a hydraulic jump with a sequent depth ratio of 5.0 is formed. This
jump can be classified as
Correct : B. oscillating jump
19. For a given discharge in a horizontal frictionless channel two depths may have the same specific
force. These two depths are known as…
Correct : C. sequent depths
20. A turbine is a device, which converts
Correct : A. hydraulic energy into mechanical energy
21. An impulse turbine:
Correct : D. operates by initial complete conversion to kinetic head
22. An impulse turbine is installed
Correct : A. always above the tail race
23. A Pelton turbine is
Correct : D. all of the above
24. The reaction turbine is one in which the available hydraulic energy is converted to kinetic energy
before the fluid enters the runner
Correct : B. partially
25. The function of draft tube is
Correct : C. both (a) and (b)
26. A draft tube is a part of the installation of a
Correct : A. propeller turbine
27. A turbine develops 3417hp at 240 r.p.m. The torque in the shaft is
Correct : D. 100kn.m
28. A reaction turbine discharges 50m3/sec of water under a head of 7.5m with an overall efficiency
of 80%. The H.P. Developed is:
Correct : C. 4000
29. To generate 8.1 MW under a head of 81m while working at a speed of 540rpm, what type of
turbine is suitable?
Correct : B. francis turbine
30. A turbine works at 20 m head and speed of 500 rpm. Its 1:2 scale model to be tested at same
head should have a rotational speed of
Correct : D. 250rpm
31. The speed ratio of an impulse turbine operating under a head off 400m is 0.46. The p.c.d of
turbine wheel is 22.25m then rotational speed, in rpm is
Correct : B. 346
32. Mechanical efficiency of a turbine is the ratio of
Correct : B. power at the shaft to the power given to the runner
33. The overall efficiency of the turbine is the ratio of
Correct : C. power at the shaft to the power at the inlet of turbine
34. The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency
(ηo) is
Correct : B. ??o= ??h x ??m
35. Specific speed of the turbine is defined as the speed at which the turbine runs when
Correct : B. working under unit head and develops unit horse power
36. The Unit speed is the speed of a turbine when it is working
Correct : C. under unit head
37. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as
_____________ efficiency.
Correct : B. mechanical
38. Which of the following turbine is preferred 0 to 25m head of water?
P
Correct : B. kaplan turbine
39. A Francis turbine is used when the available head of water is
Correct : C. above 250m
40. The unit discharge through the turbine is
Correct : A. q/√h
41. The differential equation of the gradually varied flow can be written by using Manning’s Formula
for the case off a wide rectangular channel as (dy/dx) =
Correct : A. s0{[1-(yn/y)3.33]/[1-(yn/y)3]}
42. If E = specific energy at a section in a gradually varied flow, then (dE/dx) =
Correct : B. s0-sf
43. ation
Select the correct answer using the codes given below:
Correct : A. 1,2 and 3
44. Calculate the value of rate of change of specific energy for a triangular channel having depth
3.5m and the side slope is 1H:2V. Given: V=2.5m/s, dy/dx= 8.6x10-4
Correct : C. 5.47 x10-4m
45. Calculate the value of Sf for trapezoidal channel having depth 2m, width 5m and side slope of
1H:1.5V. Given: dy/dx= 1.18x10-3, S0= 1 in 1000, C= 50.
Correct : A. 0.00001
46. When S0 is equal to zero, it is called -----
Correct : B. horizontal slope
47. Hydraulic radius for wide rectangular channel section is---
Correct : C. y
48. Specific energy in GVF changes only under which of the following conditions:
Correct : A. difference between bed slope and slope of the energy line
49. When Yn is greater than Yc and So greater than 0, it is called as ----
Correct : D. mild
50. A slope based on the culvert bottom is called----
Correct : A. hydraulic slope
51. When S0 greater than 0 and Yn less than Yc it is called as
Correct : D. steep
52. Which of the following assumptions are true in case of GVF?
Correct : B. stream lines are parallel
53. What happens to depth of flow when there is obstruction in path
Correct : B. increases
54. Calculate the value of Froud’s number if the ratio of rate of change of specific energy and rate of
change of depth is 0.9.
Correct : C. 0.31
55. If the difference between specific energies is 2m, calculate the rate of change of specific
energies if the length of backwater curve is 26314 m.
Correct : B. 7.6 x10-5m
56. When gravitational force is equal to the friction drag, what type of depth is formed?
P
Correct : B. normal depth
57. Determine the length of backwater curve if E1=2.8m, E2=5.6m, S0=0.00009, Sf= 0.00004.
Correct : D. 56000m
58. Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length of
backwater curve is 104166.67m. If E1-E2= 3m.
Correct : D. 5.28 x10-5
59. calculate the frictional slope of a triangular channel having depth 2.5m and side slope of 1H:2V.
If the rate of change of specific energy is 1.6 x10-5m/s, If V= 1.57 m/s.
Correct : C. 7.53 x10-4m
60. The force exerted by jet of the water on stationary vertical plate in the direction of the jet is given by
Correct : C. fx= ??av2
61. The force exerted by jet of the water on stationary inclined plate in the direction of the jet is given by
Correct : B. fx= ??av2sin2??
62. The force exerted by jet of the water on stationary curved plate in the direction of the jet is given by
Correct : B. fx = ??av2(1+cos??)
63. The force exerted by jet of the water having velocity V on a vertical plate moving with a velocity u is
given by
Correct : B. fx = ??a(v-u) 2
64. The force exerted by jet of the water having velocity V on a series of vertical plate moving with a
velocity u is given by,
Correct : A. fx= ??av2.
65. Efficiency of the jet of the water having velocity V & Striking a series if vertical plates moving with a velocity u is given by,
Correct : B. [2u(v-u)]/v2
66. Efficiency off the jet of the water having velocity V & Striking a series of vertical plates moving with
a velocity u, is maximum when
Correct : D. none of the above
67. For a series o curved radial vanes, the work done per second per unit weight is equal to
Correct : C. 1/g[vw1u1??vw2u2.]
68. The work done by centrifugal pump on water per second per unit weight of water is given by
Correct : B. 1/g[vw2u2]
69. The manometric head Hm of a centrifugal pump is given by
Correct : C. total head at outlet - total head at inlet
70. The manometric efficiency (ηman) of a centrifugal pump is given by
Correct : B. ghm/vw2u2
71. Mechanical efficiency (ηmech) of a centrifugal pump is given by
Correct : A. (power at the impeller)/ s.h.p.
72. To produce a high head by multistage centrifugal pumps, the impellers are connected…
P
Correct : B. in series
73. To discharge a large quantity of liquid by multi-stage centrifugal pump, the impellers are connected
Correct : A. in parallel
74. Specific speed of a pump is the speed at which a pump runs when
Correct : A. head developed is unity and discharge is one cubic meter
75. The specific speed (Ns) of aa pump is given by thee expression
Correct : C. ns= [n√q]/[hm3/4]
76. Cavitation will take place if the pressure of the flowing fluid at any point is
P
Correct : C. is less than vapor pressure of the fluid
77. Cavitation can take place in case of
Correct : B. francis turbine
78. Air vessel in reciprocating pump is used
Correct : A. to obtain continuous supply of water at uniform rate
79. During suction stroke of a reciprocating pump, the separation may take place
Correct : C. in the beginning of the suction stroke
80. During delivery stroke of a reciprocating pump, the separation may take place
P
Correct : A. ge 5 of 7a) at the end of the suction stroke
81. 14 Discharge of centrifugal pump is
Correct : C. directly proportional to (diameter)2 of its impeller
82. The ratio of quantity off liquid discharged per second from the pump to the quantity of liquid
passing per second through the impeller is known as
Correct : D. volumetric efficiency
83. Multi-stage centrifugal pump are used to
Correct : B. produce high heads
84. The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of
15 meters at 725r.p.m., is
Correct : C. 82.4r.p.m.
85. The specific speed from a centrifugal pump indicates that the pump is
Correct : D. high speed with axial flow at outlet
86. Discharge of a centrifugal pump is (where N= speed of the pump impeller)
Correct : A. directly proportional to n
87. For a centrifugal pump impeller, the maximum value of the vane exit angle is
Correct : C. 20o to 25o
88. Pascal-second is the unit of
Correct : C. dynamic viscosity
89. An ideal fluid is
Correct : B. frictionless and incompressible
90. The unit of kinematic viscosity is
Correct : D. cm2/sec
91. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then
the kinematic viscosity of that fluid in stokes is
Correct : C. 1.0
92. The viscosity of a gas
Correct : B. increases with increase in temperature
93. Newton’s law of viscosity relates
Correct : B. shear stress and rate of angular deformation
94. An open tank contains 1 m deep water with 50 cm depth of oil of specific
gravity 0.8 above it. The intensity of pressure at the bottom of tank will be
Correct : D. 14 kN/m2
95. The position of center of pressure on a plane surface immersed vertically in
a static mass of fluid is
Correct : C. always below the centroid of the area
96. The total pressure on a plane surface inclined at an angle 9 with the
horizontal is equal to (where p is pressure intensity at centroid of area and A is area of plane surface.)
Correct : A. PA
97. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of
Correct : C. 4.2m
98. Centre of buoyancy always
Correct : B. coincides with the centroid of the volume of fluid displaced
99. If the weight of a body immersed in a fluid exceeds the buoyant force, then
the body will
Correct : B. tend to move downward and it may finally sink
100. Metacentric height for small values of angle of heel is the distance between
the