MCQOPTIONS
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MCQOPTIONS
This section includes 131 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
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 |
| A. | 0.25 |
| B. | 0.50 |
| C. | 1.0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 52. |
In which of the following the friction drag is generally larger than pressure drag? |
| A. | a circular disc or plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | an airfoil |
| Answer» E. | |
| 53. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» C. Remain same | |
| 54. |
Which of the following turbine is preferred 0 to 25m head of water? P |
| A. | ge 4 of 11a) pelton wheel |
| B. | kaplan turbine |
| C. | francis turbine |
| D. | none of the above |
| Answer» C. francis turbine | |
| 55. |
Calculate the value of rate of change of specific energy for a triangular channel having depth3.5m and the side slope is 1H:2V. Given: V=2.5m/s, dy/dx= 8.6x10-4 |
| A. | 3.74x10-4m |
| B. | 4.47 x10-4m |
| C. | 5.47 x10-4m |
| D. | 6.47 x10-4m |
| Answer» D. 6.47 x10-4m | |
| 56. |
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. |
| A. | 5.53 x10-4m |
| B. | 6.53 x10-4m |
| C. | 7.53 x10-4m |
| D. | 8.53 x10-4m |
| Answer» D. 8.53 x10-4m | |
| 57. |
If the difference between specific energies is 2m, calculate the rate of change of specificenergies if the length of backwater curve is 26314 m. |
| A. | 6.6x10-5m |
| B. | 7.6 x10-5m |
| C. | 8.6 x10-5m |
| D. | 9.6 x10-5m |
| Answer» C. 8.6 x10-5m | |
| 58. |
Calculate the value of Sf for trapezoidal channel having depth 2m, width 5m and side slope of1H:1.5V. Given: dy/dx= 1.18x10-3, S0= 1 in 1000, C= 50. |
| A. | 0.00001 |
| B. | 0.00002 |
| C. | 0.00003 |
| D. | 0.00004 |
| Answer» B. 0.00002 | |
| 59. |
Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 60. |
Hydraulic energy is converted into another form of energy by hydraulic machines. What form of energy is that? |
| A. | Mechanical Energy |
| B. | Electrical Energy |
| C. | Nuclear Energy |
| D. | Elastic Energy |
| Answer» B. Electrical Energy | |
| 61. |
To produce a high head by multistage centrifugal pumps, the impellers are connected P |
| A. | ge 3 of 7a) in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» C. in parallel and in series both | |
| 62. |
The ratio of quantity off liquid discharged per second from the pump to the quantity of liquidpassing per second through the impeller is known as |
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» E. | |
| 63. |
The speed ratio of an impulse turbine operating under a head off 400m is 0.46. The p.c.d ofturbine wheel is 22.25m then rotational speed, in rpm is |
| A. | 245 |
| B. | 346 |
| C. | 692 |
| D. | 946 |
| Answer» C. 692 | |
| 64. |
The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. 1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine? |
| A. | 26.124 m/s |
| B. | 40 m/s |
| C. | 36.124 m/s |
| D. | 60 m/s |
| Answer» D. 60 m/s | |
| 65. |
A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be |
| A. | less than 1 m/sec |
| B. | 1 m/sec |
| C. | 1.5 m/sec |
| D. | 2 m/sec |
| Answer» C. 1.5 m/sec | |
| 66. |
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is |
| A. | constant |
| B. | dependent only on Reynolds number |
| C. | a function of Reynolds number and relative roughness |
| D. | dependent on relative roughness only |
| Answer» C. a function of Reynolds number and relative roughness | |
| 67. |
The force exerted by jet of the water having velocity V on a vertical plate moving with a velocity u isgiven by |
| A. | fx = ??a(v-u) 2sin2?? |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??a(v-u) 2 [1+cos??] |
| D. | none of the above |
| Answer» C. fx = ??a(v-u) 2 [1+cos??] | |
| 68. |
The force exerted by jet of the water having velocity V on a series of vertical plate moving with avelocity u is given by, |
| A. | fx= ??av2. |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??avu. |
| D. | none of the above. |
| Answer» B. fx = ??a(v-u) 2 | |
| 69. |
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is |
| A. | at the centroid of the submerged area |
| B. | always above the centroid of the area |
| C. | always below the centroid of the area |
| D. | none of the above |
| Answer» D. none of the above | |
| 70. |
The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m3/s)? |
| A. | 90 |
| B. | 111 |
| C. | 125 |
| D. | 168 |
| Answer» C. 125 | |
| 71. |
Efficiency off the jet of the water having velocity V & Striking a series of vertical plates moving with a velocity u, is maximum when |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» E. | |
| 72. |
Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 73. |
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is |
| A. | less than 1 |
| B. | between 1 and 100 |
| C. | 160 |
| D. | 200 |
| Answer» D. 200 | |
| 74. |
The relation between hydraulic efficiency ( h), mechanical efficiency ( m) and overall efficiency( o) is |
| A. | ??h= ??o x ??m |
| B. | ??o= ??h x ??m |
| C. | ??o= ??m/??h |
| D. | none off the above |
| Answer» C. ??o= ??m/??h | |
| 75. |
If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as |
| A. | x |
| B. | x |
| C. | x |
| D. | x/7 |
| Answer» B. x | |
| 76. |
A reaction turbine discharges 50m3/sec of water under a head of 7.5m with an overall efficiencyof 80%. The H.P. Developed is: |
| A. | 5000 |
| B. | 300 |
| C. | 4000 |
| D. | 400 |
| Answer» D. 400 | |
| 77. |
The main difference between reaction turbine and inward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» C. Radially outward | |
| 78. |
The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner |
| A. | Variable acceleration |
| B. | Constant acceleration |
| C. | Variable velocity |
| D. | Constant velocity |
| Answer» E. | |
| 79. |
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called |
| A. | Continuity equation |
| B. | Bernoulli's equation |
| C. | Pascal's law |
| D. | Archimedes s principle |
| Answer» C. Pascal's law | |
| 80. |
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is |
| A. | d > m > e |
| B. | d > e > m |
| C. | e > m > d |
| D. | e > d > m |
| Answer» E. | |
| 81. |
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because |
| A. | It is easier to see through the glass tube |
| B. | Glass tube is cheaper than a metallic tube |
| C. | It is not possible to conduct this experiment with any other tube |
| D. | All of the above |
| Answer» B. Glass tube is cheaper than a metallic tube | |
| 82. |
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» E. | |
| 83. |
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on |
| A. | a circular disc of plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | a streamlined body |
| Answer» B. a sphere | |
| 84. |
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant) |
| A. | A M m1/2 i2/3 |
| B. | A M m2/3 i1/2 |
| C. | A1/2 M2/3 m i |
| D. | A2/3 M1/3 m i |
| Answer» C. A1/2 M2/3 m i | |
| 85. |
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is |
| A. | 0 |
| B. | 1 |
| C. | 4/3 |
| D. | 2 |
| Answer» C. 4/3 | |
| 86. |
The most economical section is one for which a given cross sectional area, the slope of the bed (s)and coefficient of resistance has |
| A. | maximum wetted perimeter |
| B. | maximum discharge |
| C. | maximum depth of flow |
| D. | none of the above |
| Answer» C. maximum depth of flow | |
| 87. |
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) = |
| A. | s0{[1-(yn/y)3.33]/[1-(yn/y)3]} |
| B. | s0{[1-(yc/y)3.33]/[1-(yc/y)3]} |
| C. | s0{[1-(yn/y)3]/[1-(yn/y)3]} |
| D. | s0{[1-(yo/yc)3]/[1-(yn/y)3.33]} |
| Answer» B. s0{[1-(yc/y)3.33]/[1-(yc/y)3]} | |
| 88. |
For a given discharge in a horizontal frictionless channel two depths may have the same specificforce. These two depths are known as |
| A. | sudden depth |
| B. | conjugate depths |
| C. | sequent depths |
| D. | normal and critical depths |
| Answer» D. normal and critical depths | |
| 89. |
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle ' '. Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | Sin |
| B. | 1/Sin |
| C. | Cos |
| D. | 1/Cos |
| Answer» C. Cos | |
| 90. |
The increase in meta centric heighti) increases stabilityii) decreases stabilityiii) increases comfort for passengersiv) decreases comfort for passengersThe correct answer is |
| A. | (i) and (iii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 91. |
ationSelect the correct answer using the codes given below: |
| A. | 1,2 and 3 |
| B. | 1 and 3 only |
| C. | 1 and 2 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 3 only | |
| 92. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as_____________ efficiency. |
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| D. | none of the above |
| Answer» C. overall | |
| 93. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» E. | |
| 94. |
In the figure shown below, which of the following type of runners has the blade curvature as shown in the above figure (The arrow denotes direction of blade motion)? |
| A. | Information insufficient to determine |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» C. Medium Runner | |
| 95. |
Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length ofbackwater curve is 104166.67m. If E1-E2= 3m. |
| A. | 2.28x 10-5 |
| B. | 3.28 x10-5 |
| C. | 4.28 x10-5 |
| D. | 5.28 x10-5 |
| Answer» E. | |
| 96. |
A hydraulically efficient trapezoidal section has a side slopes of 2 horizontal :1 vertical. The ratio ofthe bed width to depth B/y in this channel is |
| A. | 4.94 |
| B. | 2.19 |
| C. | 0.472 |
| D. | 0.236 |
| Answer» D. 0.236 | |
| 97. |
A hydraulic jump takes place in a horizontal rectangular channel from a depth of 0.20m to 2.40m Thedischarge in the channel in m3/s per meter width is |
| A. | 2.47 |
| B. | 12.0 |
| C. | 3.2 |
| D. | 0.08 |
| Answer» B. 12.0 | |
| 98. |
In a horizontal rectangular channel a hydraulic jump with a sequent depth ratio of 5.0 is formed. Thisjump can be classified as |
| A. | weak jump |
| B. | oscillating jump |
| C. | strong jump |
| D. | steady jump |
| Answer» C. strong jump | |
| 99. |
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» B. 100 kg | |
| 100. |
Total head of turbines is_ |
| A. | Pressure head + Static head |
| B. | Kinetic head + Static head |
| C. | Static head + Pressure head |
| D. | Pressure head + Kinetic head + Static head |
| Answer» E. | |