MCQOPTIONS
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MCQOPTIONS
This section includes 136 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
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… |
| A. | 2.47 |
| B. | 12.0 |
| C. | 3.2 |
| D. | 0.08 |
| Answer» B. 12.0 | |
| 102. |
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)? |
| A. | 27 |
| B. | 10.5 |
| C. | 15 |
| D. | 42 |
| Answer» C. 15 | |
| 103. |
In a horizontal rectangular channel a hydraulic jump with a sequent depth ratio of 5.0 is formed. This jump can be classified as |
| A. | weak jump |
| B. | oscillating jump |
| C. | strong jump |
| D. | steady jump |
| Answer» C. strong jump | |
| 104. |
The hydraulic jump always occurs from |
| A. | a m2 curve to a m1 curve |
| B. | a h3 curve to a h1 curve |
| C. | below normal depth to above normal depth |
| D. | below critical depth to above critical depth |
| Answer» E. | |
| 105. |
For a given discharge in a horizontal frictionless channel two depths may have the same specific force. 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 | |
| 106. |
A turbine is a device, which converts |
| A. | hydraulic energy into mechanical energy |
| B. | mechanical energy into hydraulic energy |
| C. | kinetic energy into mechanical energy |
| D. | electrical energy into mechanical energy |
| Answer» B. mechanical energy into hydraulic energy | |
| 107. |
An impulse turbine is installed |
| A. | always above the tail race |
| B. | always submerged |
| C. | depends on flow situation |
| D. | partly submerged |
| Answer» B. always submerged | |
| 108. |
A Pelton turbine is |
| A. | an impulse turbine |
| B. | a tangential flow |
| C. | high had and low specific speed turbine |
| D. | all of the above |
| Answer» E. | |
| 109. |
An impulse turbine: |
| A. | is always operates submerged |
| B. | is makes use of draft tube |
| C. | is most suited for low head installation |
| D. | operates by initial complete conversion to kinetic head |
| Answer» E. | |
| 110. |
A draft tube is a part of the installation of a |
| A. | propeller turbine |
| B. | pelton turbine |
| C. | turbine impulse wheel |
| D. | all the turbines |
| Answer» B. pelton turbine | |
| 111. |
The reaction turbine is one in which the available hydraulic energy is converted to kinetic energy before the fluid enters the runner |
| A. | fully |
| B. | partially |
| C. | fully or partially |
| D. | fully and partially |
| Answer» C. fully or partially | |
| 112. |
The function of draft tube is |
| A. | recuperation of energy |
| B. | to make it possible to establish the turbine above tail race |
| C. | both (a) and (b) |
| D. | none |
| Answer» D. none | |
| 113. |
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» C. pressure distribution is not hydrostatic | |
| 114. |
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. |
| 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 | |
| 115. |
What happens to depth of flow when there is obstruction in path |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | flow stops |
| Answer» C. decreases | |
| 116. |
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» E. | |
| 117. |
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» D. none of the above | |
| 118. |
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» C. cylindrical depth | |
| 119. |
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» C. 1/g[vw2u2-vw1u1] | |
| 120. |
The manometric efficiency (ηman) of a centrifugal pump is given by |
| A. | hm/gvw2u2 |
| B. | ghm/vw2u2 |
| C. | vw2u2/ghm |
| D. | gvw2u2/hm |
| Answer» C. vw2u2/ghm | |
| 121. |
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» D. none of the above | |
| 122. |
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 | |
| 123. |
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» B. s.h.p/ power at the impeller | |
| 124. |
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» B. head developed is unity and shat horse power is also unity | |
| 125. |
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» D. ns= [n√p]/[hm5/4] | |
| 126. |
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» B. to reduce suction head | |
| 127. |
Cavitation can take place in case of |
| A. | pelton wheel |
| B. | francis turbine |
| C. | reciprocating pump |
| D. | centrifugal pump |
| Answer» C. reciprocating pump | |
| 128. |
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» D. none of the above | |
| 129. |
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» B. in the middle of the suction stroke | |
| 130. |
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 |
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» E. | |
| 131. |
Multi-stage centrifugal pump are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» C. pump viscous fluids | |
| 132. |
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» D. non off the above | |
| 133. |
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» B. inversely proportional to n | |
| 134. |
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» E. | |
| 135. |
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 |
| A. | 24.8r.p.m. |
| B. | 48.2r.p.m. |
| C. | 82.4r.p.m. |
| D. | 248r.p.m. |
| Answer» D. 248r.p.m. | |
| 136. |
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» D. 25o to 30o | |