McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 51. |
Which of the following assumptions are true in case of GVF? |
| A. | flow is not steady |
| B. | stream lines are parallel |
| C. | pressure distribution is not hydrostatic |
| D. | channel has varying alignment and shape |
| Answer» B. stream lines are parallel | |
| 52. |
What happens to depth of flow when there is obstruction in path |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | flow stops |
| Answer» B. increases | |
| 53. |
Calculate the value of Froud’s number if the ratio of rate of change of specific energy and rate of
|
| A. | 0.29 |
| B. | 0.30 |
| C. | 0.31 |
| D. | 0.32 |
| Answer» C. 0.31 | |
| 54. |
If the difference between specific energies is 2m, calculate the rate of change of specific
|
| A. | 6.6x10-5m |
| B. | 7.6 x10-5m |
| C. | 8.6 x10-5m |
| D. | 9.6 x10-5m |
| Answer» B. 7.6 x10-5m | |
| 55. |
When gravitational force is equal to the friction drag, what type of depth is formed? P |
| A. | ge 9 of 11a) critical depth |
| B. | normal depth |
| C. | cylindrical depth |
| D. | conical depth |
| Answer» B. normal depth | |
| 56. |
Determine the length of backwater curve if E1=2.8m, E2=5.6m, S0=0.00009, Sf= 0.00004. |
| A. | 26000m |
| B. | 36000m |
| C. | 46000m |
| D. | 56000m |
| Answer» D. 56000m | |
| 57. |
Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length of
|
| A. | 2.28x 10-5 |
| B. | 3.28 x10-5 |
| C. | 4.28 x10-5 |
| D. | 5.28 x10-5 |
| Answer» D. 5.28 x10-5 | |
| 58. |
calculate the frictional slope of a triangular channel having depth 2.5m and side slope of 1H:2V.
|
| A. | 5.53 x10-4m |
| B. | 6.53 x10-4m |
| C. | 7.53 x10-4m |
| D. | 8.53 x10-4m |
| Answer» C. 7.53 x10-4m | |
| 59. |
The force exerted by jet of the water on stationary vertical plate in the direction of the jet is given by |
| A. | fx= ??av2sin2?? |
| B. | fx= ??av2(1+cos??) |
| C. | fx= ??av2 |
| D. | none of the above |
| Answer» C. fx= ??av2 | |
| 60. |
The force exerted by jet of the water on stationary inclined plate in the direction of the jet is given by |
| A. | fx= ??av2 |
| B. | fx= ??av2sin2?? |
| C. | fx= ??av2 (1+cos??) |
| D. | fx= ??av2 (1+sin??) |
| Answer» B. fx= ??av2sin2?? | |
| 61. |
The force exerted by jet of the water on stationary curved plate in the direction of the jet is given by |
| A. | fx = ??av2sin2?? |
| B. | fx = ??av2(1+cos??) |
| C. | fx = ??av2 |
| D. | fx = ??av2 (1+sin??) |
| Answer» B. fx = ??av2(1+cos??) | |
| 62. |
The force exerted by jet of the water having velocity V on a vertical plate moving with a velocity u is
|
| 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» B. fx = ??a(v-u) 2 | |
| 63. |
The force exerted by jet of the water having velocity V on a series of vertical plate moving with a
|
| A. | fx= ??av2. |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??avu. |
| D. | none of the above. |
| Answer» A. fx= ??av2. | |
| 64. |
Efficiency of the jet of the water having velocity V & Striking a series if vertical plates moving with a velocity u is given by, |
| A. | [2v(v-u)]/u2 |
| B. | [2u(v-u)]/v2 |
| C. | u2/[v2(v-u)] |
| D. | none of the above. |
| Answer» B. [2u(v-u)]/v2 | |
| 65. |
Efficiency off the jet of the water having velocity V & Striking a series of vertical plates moving with
|
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» D. none of the above | |
| 66. |
For a series o curved radial vanes, the work done per second per unit weight is equal to |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» C. 1/g[vw1u1??vw2u2.] | |
| 67. |
The work done by centrifugal pump on water per second per unit weight of water is given by |
| A. | 1/g[vw1u1] |
| B. | 1/g[vw2u2] |
| C. | 1/g[vw2u2-vw1u1] |
| D. | none of the above |
| Answer» B. 1/g[vw2u2] | |
| 68. |
The manometric head Hm of a centrifugal pump is given by |
| A. | pressure head at the outlet of the pump – pressure head at the inlet |
| B. | total head at inlet – total head at outlet |
| C. | total head at outlet - total head at inlet |
| D. | none of the above |
| Answer» C. total head at outlet - total head at inlet | |
| 69. |
The manometric efficiency (ηman) of a centrifugal pump is given by |
| A. | hm/gvw2u2 |
| B. | ghm/vw2u2 |
| C. | vw2u2/ghm |
| D. | gvw2u2/hm |
| Answer» B. ghm/vw2u2 | |
| 70. |
Mechanical efficiency (ηmech) of a centrifugal pump is given by |
| A. | (power at the impeller)/ s.h.p. |
| B. | s.h.p/ power at the impeller |
| C. | power possessed by water/ power at the impeller |
| D. | power possessed by water/ s.h.p |
| Answer» A. (power at the impeller)/ s.h.p. | |
| 71. |
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» B. in series | |
| 72. |
To discharge a large quantity of liquid by multi-stage centrifugal pump, the impellers are connected |
| A. | in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» A. in parallel | |
| 73. |
Specific speed of a pump is the speed at which a pump runs when |
| A. | head developed is unity and discharge is one cubic meter |
| B. | head developed is unity and shat horse power is also unity |
| C. | discharge is one cubic meter and shaft horse power is unity |
| D. | none of the above |
| Answer» A. head developed is unity and discharge is one cubic meter | |
| 74. |
The specific speed (Ns) of aa pump is given by thee expression |
| A. | ns= [n√q]/[hm5/4] |
| B. | ns= [n√p]/[hm3/4] |
| C. | ns= [n√q]/[hm3/4] |
| D. | ns= [n√p]/[hm5/4] |
| Answer» C. ns= [n√q]/[hm3/4] | |
| 75. |
Cavitation will take place if the pressure of the flowing fluid at any point is P |
| A. | ge 4 of 7a) more than vapor pressure of the fluid |
| B. | equal to vapor pressure of the fluid |
| C. | is less than vapor pressure of the fluid |
| D. | none of the above |
| Answer» C. is less than vapor pressure of the fluid | |
| 76. |
Cavitation can take place in case of |
| A. | pelton wheel |
| B. | francis turbine |
| C. | reciprocating pump |
| D. | centrifugal pump |
| Answer» B. francis turbine | |
| 77. |
Air vessel in reciprocating pump is used |
| A. | to obtain continuous supply of water at uniform rate |
| B. | to reduce suction head |
| C. | to increase the delivery head |
| D. | none of the above |
| Answer» A. to obtain continuous supply of water at uniform rate | |
| 78. |
During suction stroke of a reciprocating pump, the separation may take place |
| A. | at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» C. in the beginning of the suction stroke | |
| 79. |
During delivery stroke of a reciprocating pump, the separation may take place P |
| A. | ge 5 of 7a) at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» A. ge 5 of 7a) at the end of the suction stroke | |
| 80. |
14 Discharge of centrifugal pump is |
| A. | directly proportional to diameter of its impeller |
| B. | inversely proportional to diameter of its impeller |
| C. | directly proportional to (diameter)2 of its impeller |
| D. | inversely proportional to (diameter)2 of its impeller |
| Answer» C. directly proportional to (diameter)2 of its impeller | |
| 81. |
The ratio of quantity off liquid discharged per second from the pump to the quantity of liquid
|
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» D. volumetric efficiency | |
| 82. |
Multi-stage centrifugal pump are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» B. produce high heads | |
| 83. |
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of
|
| A. | 24.8r.p.m. |
| B. | 48.2r.p.m. |
| C. | 82.4r.p.m. |
| D. | 248r.p.m. |
| Answer» C. 82.4r.p.m. | |
| 84. |
The specific speed from a centrifugal pump indicates that the pump is |
| A. | slow speed at radial flow at outlet |
| B. | medium speed with radial flow at outlet |
| C. | high speed with radial flow at outlet |
| D. | high speed with axial flow at outlet |
| Answer» D. high speed with axial flow at outlet | |
| 85. |
Discharge of a centrifugal pump is (where N= speed of the pump impeller) |
| A. | directly proportional to n |
| B. | inversely proportional to n |
| C. | directly proportional to n2 |
| D. | inversely proportional to n2 |
| Answer» A. directly proportional to n | |
| 86. |
For a centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. | 10o to 15o |
| B. | 15o to 20o |
| C. | 20o to 25o |
| D. | 25o to 30o |
| Answer» C. 20o to 25o | |
| 87. |
Pascal-second is the unit of |
| A. | pressure |
| B. | kinematic viscosity |
| C. | dynamic viscosity |
| D. | surface tension |
| Answer» C. dynamic viscosity | |
| 88. |
An ideal fluid is |
| A. | one which obeys Newton’s law of viscosity |
| B. | frictionless and incompressible |
| C. | very viscous |
| D. | frictionless and compressible |
| Answer» B. frictionless and incompressible | |
| 89. |
The unit of kinematic viscosity is |
| A. | gm/cm-sec2 |
| B. | dyne-sec/cm2 |
| C. | gm/cm2-sec |
| D. | cm2/sec |
| Answer» D. cm2/sec | |
| 90. |
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» C. 1.0 | |
| 91. |
The viscosity of a gas |
| A. | decreases with increase in temperature |
| B. | increases with increase in temperature |
| C. | is independent of temperature |
| D. | is independent of pressure for very high pressure intensities |
| Answer» B. increases with increase in temperature | |
| 92. |
Newton’s law of viscosity relates |
| A. | intensity of pressure and rate of angular deformation |
| B. | shear stress and rate of angular deformation |
| C. | shear stress, viscosity and temperature |
| D. | viscosity and rate of angular deformation |
| Answer» B. shear stress and rate of angular deformation | |
| 93. |
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 |
| A. | 4 kN/m2 |
| B. | 10 kN/m2 |
| C. | 12 kN/m2 |
| D. | 14 kN/m2 |
| Answer» D. 14 kN/m2 | |
| 94. |
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» C. always below the centroid of the area | |
| 95. |
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.) |
| A. | PA |
| B. | pA sin 9 |
| C. | pA cos 9 |
| D. | pA tan 9 |
| Answer» A. PA | |
| 96. |
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 |
| A. | 3.75 m |
| B. | 4.0 m |
| C. | 4.2m |
| D. | 4.5m |
| Answer» C. 4.2m | |
| 97. |
Centre of buoyancy always |
| A. | coincides with the centre of gravity |
| B. | coincides with the centroid of the volume of fluid displaced |
| C. | remains above the centre of gravity |
| D. | remains below the centre of gravity |
| Answer» B. coincides with the centroid of the volume of fluid displaced | |
| 98. |
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will |
| A. | rise until its weight equals the buoyant force |
| B. | tend to move downward and it may finally sink |
| C. | float |
| D. | none of the above |
| Answer» B. tend to move downward and it may finally sink | |
| 99. |
Metacentric height for small values of angle of heel is the distance between the |
| A. | centre of gravity and centre of buoy-ancy |
| B. | centre of gravity and metacentre |
| C. | centre of buoyancy and metacentre |
| D. | free surface and centre of buoyancy |
| Answer» B. centre of gravity and metacentre | |
| 100. |
A floating body is said to be in a state of stable equilibrium |
| A. | when its metacentric height is zero |
| B. | when the metacentre is above the centre of gravity |
| C. | when the metacentre is below the centre of gravity |
| D. | only when its centre of gravity is below its centre of buoyancy |
| Answer» B. when the metacentre is above the centre of gravity | |
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