MCQOPTIONS
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MCQOPTIONS
This section includes 31 Mcqs, each offering curated multiple-choice questions to sharpen your Energy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
__________ is used to determine the reservoir capacity required to produce a yield equal to the average discharge of the stream |
| A. | Mass Curve |
| B. | Double Mass Curve |
| C. | Hydrograph |
| D. | Hyetograph |
| Answer» B. Double Mass Curve | |
| 2. |
Kirpich equation is used to determine which one of the following? |
| A. | Runoff from a given rainfall |
| B. | Base time for unit hydrograph |
| C. | Time of concentration in runoff hydrograph |
| D. | None of the above |
| Answer» D. None of the above | |
| 3. |
A hydrograph is a plot of |
| A. | Rainfall intensity against time |
| B. | Stream discharge against time |
| C. | Cumulative rainfall against time |
| D. | Cumulative runoff against time |
| Answer» C. Cumulative rainfall against time | |
| 4. |
Muskingum’s method is connected to which of the following? |
| A. | Unit Hydrograph |
| B. | Flood routing |
| C. | Design Flood estimation |
| D. | Infiltration capacity |
| Answer» C. Design Flood estimation | |
| 5. |
A catchment area of 80 hectares has a run-off coefficient of 0.5. A storm of duration larger than the time of concentration of the catchment and of intensity 3.6 cm/hr creates peak discharge of |
| A. | 0.04 m3/sec |
| B. | 0.40 m3/sec |
| C. | 4.00 m3/sec |
| D. | 40.0 m3/sec |
| Answer» D. 40.0 m3/sec | |
| 6. |
An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is PI and the time of occurrence of the peak is tI. The peak flow of the outflow hydrograph is P0 and the time of occurrence of the peak is t0.Which one of the following statements is correct? |
| A. | PI < P0 and tI > t0 |
| B. | PI > P0 and tI > t0 |
| C. | PI < P0 and tI < t0 |
| D. | PI > P0 and tI < t0 |
| Answer» E. | |
| 7. |
A 4-hour rainfall in a catchment of 250 sq. km, produces rainfall depths of 6.2 cm and 5.0 cm in successive 2-hour unit period. Assuming the φ index of the soil to be 1.2 cm per hour, the runoff volume in hectare meter will be |
| A. | 16 |
| B. | 22 |
| C. | 1600 |
| D. | 2200 |
| Answer» D. 2200 | |
| 8. |
Drainage density is the |
| A. | Sum of length of the streams per unit drainage area within the basin |
| B. | stream discharge per unit drainage area |
| C. | annual runoff per unit drainage area |
| D. | number of streams per unit drainage area |
| Answer» B. stream discharge per unit drainage area | |
| 9. |
If area of the catchment is 62.5 sq.mm and axial length of the catchment is 10 mm, the form factor will be: |
| A. | 0.625 |
| B. | 0.31 |
| C. | 6.25 |
| D. | 1 |
| Answer» B. 0.31 | |
| 10. |
A plot of rainfall intensity versus time is called as: |
| A. | Isohyet |
| B. | Hydrograph |
| C. | Mass curve |
| D. | Hyetograph |
| Answer» E. | |
| 11. |
One of the basic assumptions made in unit hydrograph theory is |
| A. | Rainfall is uniform all over the catchment |
| B. | Base flow is considered |
| C. | Rainfall varies with time |
| D. | All the above |
| Answer» B. Base flow is considered | |
| 12. |
An isolated 3-h rainfall event on a small catchment produces a hydrograph peak and point of inflection on the falling limb of the hydrograph at 7 hours and 8.5 hours respectively, after the start of the rainfall. Assuming, no losses and no base flow contribution, the time of concentration (in hours) for this catchment is approximately |
| A. | 8.5 |
| B. | 7 |
| C. | 6.5 |
| D. | 5.5 |
| Answer» E. | |
| 13. |
An IUH is a direct runoff hydrograph ? |
| A. | of one cm magnitude due to rainfall excess of 1-h duration |
| B. | that occurs instantaneously due to a rainfall excess of 1-h duration |
| C. | of unit rainfall excess precipitating instantaneously over the catchment |
| D. | occurring at any instant in long duration |
| Answer» D. occurring at any instant in long duration | |
| 14. |
Imaginary lines joining equal ___________ is known as isohyets |
| A. | height |
| B. | humidity |
| C. | rainfall |
| D. | pressure |
| Answer» D. pressure | |
| 15. |
An instantaneous unit hydrograph is a direct run-off hydrograph: |
| A. | of 12 cm magnitude due to a rainfall excess of 1-h duration |
| B. | that occurs instantaneously due to a unit rainfall excess of duration 'D' h |
| C. | of unit rainfall excess precipitating instantaneously over the catchment |
| D. | occurring at any instant in a long storm |
| Answer» D. occurring at any instant in a long storm | |
| 16. |
Rainfall hyetograph shows the variation of ______. |
| A. | Cumulative rainfall with time |
| B. | Rainfall intensity with time |
| C. | Rainfall depth over with an area |
| D. | Rainfall intensity with the cumulative rainfall |
| Answer» C. Rainfall depth over with an area | |
| 17. |
A peak flow of a flow of a flood hydrograph due to a six-hour storm is 470 m3/s. The corresponding average depth of rainfall is 8 cm.Assume an infiltration loss of 0.25 cm/hour and a constant base flow of 15 m3/s. What is the peak discharge of 6 hour unit hydrograph for this catchment? |
| A. | 60 m3/s |
| B. | 70 m3/s |
| C. | 80 m3/s |
| D. | 90 m3/s |
| Answer» C. 80 m3/s | |
| 18. |
A unit hydrograph for a watershed is triangular in share with a base period of 20 hours. The area of the watershed is 500 ha What is the peak discharge in m3 /hr? |
| A. | 4000 |
| B. | 5000 |
| C. | 6000 |
| D. | 7000 |
| Answer» C. 6000 | |
| 19. |
Bernard’s distribution graph is a plot of time on x-axis and |
| A. | total run-off on the y-axis |
| B. | run-off on the y-axis |
| C. | percentage of total surface run-off on y-axis |
| D. | percentage of total surface run-off during uniform time interval on y-axis |
| Answer» E. | |
| 20. |
If two 2-hour unit hydrograph are staggered by 2 hours and added graphically, the resulting hydrograph will be |
| A. | 2- hour unit hydrograph |
| B. | 4- hour unit hydrograph |
| C. | 2- hour unit hydrograph with 2 cm runoff |
| D. | 4- hour unit hydrograph with 2 cm runoff |
| Answer» E. | |
| 21. |
A hydrograph represents |
| A. | Variations of snowfall over time |
| B. | Variations of river discharge over time |
| C. | Variations of sediment concentration against river discharge |
| D. | Variations of water temperature against discharge |
| E. | Variations in a hydraulic jump |
| Answer» C. Variations of sediment concentration against river discharge | |
| 22. |
A triangular direct runoff hydrograph due to a storm has a time base of 90 hours. The peak flow of 60 m3/s occurs at 20 hours from the start of the storm, the area of catchment is 300 km2. The rainfall excess of the storm (in cm), is |
| A. | 2 |
| B. | 3.24 |
| C. | 5.4 |
| D. | 6.48 |
| Answer» C. 5.4 | |
| 23. |
A unit hydrograph has one unit of |
| A. | Peak discharge |
| B. | Rainfall duration |
| C. | Direct runoff |
| D. | Base time |
| Answer» D. Base time | |
| 24. |
A 3-hour storm hydrograph has 7 units of direct runoff. The 3-hour unit hydrograph for this storm can be obtained by dividing the ordinates of the storm hydrograph by: |
| A. | 3 |
| B. | 7 |
| C. | 3/7 |
| D. | 7/3 |
| Answer» C. 3/7 | |
| 25. |
Base flow separation is used in connection with |
| A. | Seepage flow |
| B. | Infiltration |
| C. | Evaporation |
| D. | Stream flow |
| Answer» E. | |
| 26. |
In the given hydrograph the peak or crest segment is indicated by:- |
| A. | BP |
| B. | BC |
| C. | AB |
| D. | PC |
| Answer» C. AB | |
| 27. |
An instantaneous unit hydrograph is a hydrograph of |
| A. | unit duration and infinitely small rainfall excess |
| B. | infinitely small duration and of unit rainfall excess |
| C. | infinitely small duration and of unit rainfall excess of an infinitely small area |
| D. | unit rainfall excess on infinitely small area |
| Answer» C. infinitely small duration and of unit rainfall excess of an infinitely small area | |
| 28. |
Dalton's law is given as: |
| A. | EL = C[es + ea] |
| B. | EL = C[ea - es] |
| C. | EL = C[es - ea] |
| D. | EL = C[es + ew] |
| Answer» D. EL = C[es + ew] | |
| 29. |
A station rating curve is a graph of |
| A. | discharge versus stage for a given point on a stream, usually at the gauging station |
| B. | velocity versus stage for a given point on a stream, usually at the gauging station |
| C. | discharge versus velocity for a given point on a stream, usually at the gauging station |
| D. | gauge height versus critical velocity of a stream, usually at the gauging station |
| Answer» B. velocity versus stage for a given point on a stream, usually at the gauging station | |
| 30. |
In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrograph |
| A. | lies outside the plotted inflow hydrograph |
| B. | lies on the recession limb of the plotted inflow hydrograph |
| C. | lies on the peak of the inflow hydrograph |
| D. | is higher than the peak of the plotted inflow hydrograph |
| Answer» C. lies on the peak of the inflow hydrograph | |
| 31. |
For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydrograph is |
| A. | 0.2 x 106 |
| B. | 0.6 x 106 |
| C. | 2.4 x 106 |
| D. | 7.2 x 106 |
| Answer» B. 0.6 x 106 | |