McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 1. |
If Velocity, pressure, density etc., do not change at a point with respect to time, flow is called |
| A. | uniform |
| B. | incompressible |
| C. | non-uniform |
| D. | steady |
| Answer» D. steady | |
| 2. |
If velocity, pressure, density etc., change at a point with respect to time, flow is called |
| A. | uniform |
| B. | compressible |
| C. | unsteady |
| D. | incompressible |
| Answer» C. unsteady | |
| 3. |
If the velocity in a fluid flow does not change with respect to length of direction of flow, it is called |
| A. | steady flow |
| B. | uniform flow |
| C. | incompressible |
| D. | rotational |
| Answer» B. uniform flow | |
| 4. |
If the velocity in a fluid flow change with respect to length of direction of flow, it is called |
| A. | unsteady flow |
| B. | compressible flow |
| C. | irrotational flow |
| D. | none of the above |
| Answer» D. none of the above | |
| 5. |
If the density of the fluid is constant from point to point in a flow region, it is called |
| A. | steady flow. |
| B. | incompressible flow |
| C. | uniform flow |
| D. | rotational flow. |
| Answer» B. incompressible flow | |
| 6. |
If the density of the flow changes from point to point in a flow region, it is called |
| A. | steady flow. |
| B. | unsteady flow |
| C. | non uniform |
| D. | compressible |
| Answer» D. compressible | |
| 7. |
Chezy’s Formula is given as |
| A. | v= s√(rc) |
| B. | v= c √(rs) |
| C. | v= r √(cs) |
| D. | none of the above. |
| Answer» B. v= c √(rs) | |
| 8. |
The discharge through the trapezoidal channel is maximum when |
| A. | half of the top width= sloping side |
| B. | top width= half of the sloping side |
| C. | top width= 1.5 x sloping side |
| D. | none of the above |
| Answer» A. half of the top width= sloping side | |
| 9. |
The maximum velocity through a circular channel when depth flow is equal to |
| A. | 0.95 x diameter |
| B. | 0.5 x diameter |
| C. | 0.81 x diameter |
| D. | none of the above |
| Answer» C. 0.81 x diameter | |
| 10. |
The maximum discharge through a circular channel takes place when depth of flow is equal to |
| A. | 0.95 x diameter |
| B. | 0.3 x diameter |
| C. | 0.81 x diameter |
| D. | 0.5 x diameter |
| Answer» A. 0.95 x diameter | |
| 11. |
The most economical section is one for which a given cross sectional area, the slope of the bed (s)
|
| A. | maximum wetted perimeter |
| B. | maximum discharge |
| C. | maximum depth of flow |
| D. | none of the above |
| Answer» B. maximum discharge | |
| 12. |
A hydraulically efficient trapezoidal section has a side slopes of 2 horizontal :1 vertical. The ratio of
|
| A. | 4.94 |
| B. | 2.19 |
| C. | 0.472 |
| D. | 0.236 |
| Answer» C. 0.472 | |
| 13. |
al to 2m and 1m respectively. If the flow is uniform and the value of Chezy’s constant is 60, the
|
| A. | 1.0 m3/s |
| B. | 1.5m3/s |
| C. | 2.0m3/s |
| D. | 3.0m3/s |
| Answer» B. 1.5m3/s | |
| 14. |
A hydraulic jump takes place in a horizontal rectangular channel from a depth of 0.20m to 2.40m The
|
| A. | 2.47 |
| B. | 12.0 |
| C. | 3.2 |
| D. | 0.08 |
| Answer» A. 2.47 | |
| 15. |
A hydraulic jump occurs at the top of a spillway. The depth before jump is 0.2m. The sequent depth
|
| A. | 27 |
| B. | 10.5 |
| C. | 15 |
| D. | 42 |
| Answer» B. 10.5 | |
| 16. |
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» D. below critical depth to above critical depth | |
| 17. |
In a horizontal rectangular channel a hydraulic jump with a sequent depth ratio of 5.0 is formed. This
|
| A. | weak jump |
| B. | oscillating jump |
| C. | strong jump |
| D. | steady jump |
| Answer» B. oscillating jump | |
| 18. |
For a given discharge in a horizontal frictionless channel two depths may have the same specific
|
| A. | sudden depth |
| B. | conjugate depths |
| C. | sequent depths |
| D. | normal and critical depths |
| Answer» C. sequent depths | |
| 19. |
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» A. hydraulic energy into mechanical energy | |
| 20. |
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» D. operates by initial complete conversion to kinetic head | |
| 21. |
An impulse turbine is installed |
| A. | always above the tail race |
| B. | always submerged |
| C. | depends on flow situation |
| D. | partly submerged |
| Answer» A. always above the tail race | |
| 22. |
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» D. all of the above | |
| 23. |
The reaction turbine is one in which the available hydraulic energy is converted to kinetic energy
|
| A. | fully |
| B. | partially |
| C. | fully or partially |
| D. | fully and partially |
| Answer» B. partially | |
| 24. |
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» C. both (a) and (b) | |
| 25. |
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» A. propeller turbine | |
| 26. |
A turbine develops 3417hp at 240 r.p.m. The torque in the shaft is |
| A. | 400kn.m |
| B. | 3335kn.m |
| C. | 1000kn.m |
| D. | 100kn.m |
| Answer» D. 100kn.m | |
| 27. |
A reaction turbine discharges 50m3/sec of water under a head of 7.5m with an overall efficiency
|
| A. | 5000 |
| B. | 300 |
| C. | 4000 |
| D. | 400 |
| Answer» C. 4000 | |
| 28. |
To generate 8.1 MW under a head of 81m while working at a speed of 540rpm, what type of
|
| A. | pelton wheel |
| B. | francis turbine |
| C. | kaplan turbine |
| D. | propeller turbine |
| Answer» B. francis turbine | |
| 29. |
A turbine works at 20 m head and speed of 500 rpm. Its 1:2 scale model to be tested at same
|
| A. | 1000rpm |
| B. | 750rpm |
| C. | 500rpm |
| D. | 250rpm |
| Answer» D. 250rpm | |
| 30. |
The speed ratio of an impulse turbine operating under a head off 400m is 0.46. The p.c.d of
|
| A. | 245 |
| B. | 346 |
| C. | 692 |
| D. | 946 |
| Answer» B. 346 | |
| 31. |
Mechanical efficiency of a turbine is the ratio of |
| A. | power at the inlet to the power at the shaft of turbine |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» B. power at the shaft to the power given to the runner | |
| 32. |
The overall efficiency of the turbine is the ratio of |
| A. | power at the inlet of the turbine to the power at the shaft |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» C. power at the shaft to the power at the inlet of turbine | |
| 33. |
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency
|
| A. | ??h= ??o x ??m |
| B. | ??o= ??h x ??m |
| C. | ??o= ??m/??h |
| D. | none off the above |
| Answer» B. ??o= ??h x ??m | |
| 34. |
Specific speed of the turbine is defined as the speed at which the turbine runs when |
| A. | working under unit head and discharging one liter per second |
| B. | working under unit head and develops unit horse power |
| C. | develops unit horse power and discharges one liter per second |
| D. | none of the above |
| Answer» B. working under unit head and develops unit horse power | |
| 35. |
The Unit speed is the speed of a turbine when it is working |
| A. | under unit head and develops unit power |
| B. | under unit head and discharge one m3/sec |
| C. | under unit head |
| D. | none of the above |
| Answer» C. under unit head | |
| 36. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as
|
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| D. | none of the above |
| Answer» B. mechanical | |
| 37. |
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» B. kaplan turbine | |
| 38. |
A Francis turbine is used when the available head of water is |
| A. | 0 to 25m |
| B. | 25 to 250m |
| C. | above 250m |
| D. | none of these |
| Answer» C. above 250m | |
| 39. |
The unit discharge through the turbine is |
| A. | q/√h |
| B. | q/h |
| C. | q/h3/2 |
| D. | q/h2 |
| Answer» A. q/√h | |
| 40. |
The differential equation of the gradually varied flow can be written by using Manning’s Formula
|
| 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» A. s0{[1-(yn/y)3.33]/[1-(yn/y)3]} | |
| 41. |
If E = specific energy at a section in a gradually varied flow, then (dE/dx) = |
| A. | s0+sf |
| B. | s0-sf |
| C. | sf-s0 |
| D. | sfs0-1 |
| Answer» B. s0-sf | |
| 42. |
ation
|
| A. | 1,2 and 3 |
| B. | 1 and 3 only |
| C. | 1 and 2 only |
| D. | 2 and 3 only |
| Answer» A. 1,2 and 3 | |
| 43. |
Calculate the value of rate of change of specific energy for a triangular channel having depth
|
| A. | 3.74x10-4m |
| B. | 4.47 x10-4m |
| C. | 5.47 x10-4m |
| D. | 6.47 x10-4m |
| Answer» C. 5.47 x10-4m | |
| 44. |
Calculate the value of Sf for trapezoidal channel having depth 2m, width 5m and side slope of
|
| A. | 0.00001 |
| B. | 0.00002 |
| C. | 0.00003 |
| D. | 0.00004 |
| Answer» A. 0.00001 | |
| 45. |
When S0 is equal to zero, it is called ----- |
| A. | adverse slope |
| B. | horizontal slope |
| C. | critical slope |
| D. | mild slope |
| Answer» B. horizontal slope | |
| 46. |
Hydraulic radius for wide rectangular channel section is--- |
| A. | 3y |
| B. | 2y |
| C. | y |
| D. | y/2 |
| Answer» C. y | |
| 47. |
Specific energy in GVF changes only under which of the following conditions: |
| A. | difference between bed slope and slope of the energy line |
| B. | both bed slope and energy slope are equal |
| C. | presence of bed slope alone |
| D. | presence of energy slope alone |
| Answer» A. difference between bed slope and slope of the energy line | |
| 48. |
When Yn is greater than Yc and So greater than 0, it is called as ---- |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | mild |
| Answer» D. mild | |
| 49. |
A slope based on the culvert bottom is called---- |
| A. | hydraulic slope |
| B. | hydraulic curve |
| C. | adverse slope |
| D. | horizontal slope |
| Answer» A. hydraulic slope | |
| 50. |
When S0 greater than 0 and Yn less than Yc it is called as |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | steep |
| Answer» D. steep | |
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