MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
If the direction of advance of a storm is the same as the direction of the resulting runoff in the drainage basin, such runoff will generally |
| A. | Be more than the ‘rational’ runoff through a short time |
| B. | Result in increased infiltration through a short time |
| C. | Be less than the ‘rational’ runoff through a short time |
| D. | Result in increased evaporation, as also transpiration, loss |
| Answer» B. Result in increased infiltration through a short time | |
| 2. |
An 8-hour storm with incremental rainfall during each successive hour is tabulated herewith. What will be the correction to total runoff when, whereas the actual ϕ index was 0.5 cm/hour, a wrong magnitude of 0.6 cm/hour was adopted in computing the total runoff?Time from start (hour)Incremental rainfall in each hour (cm)10.420.831.240.951.861.070.380.8 |
| A. | + 1.0 cm |
| B. | + 0.9 cm |
| C. | + 0.8 cm |
| D. | + 0.6 cm |
| Answer» E. | |
| 3. |
Direct runoff is made up of |
| A. | Surface runoff, prompt interflow and channel precipitation |
| B. | Surface runoff, infiltration and evapotranspiration |
| C. | Overland flow and infiltration |
| D. | Rainfall and evaporation |
| Answer» B. Surface runoff, infiltration and evapotranspiration | |
| 4. |
Rainfall of magnitude 4.3 cm, followed by 3.7 cm, occurred on two consecutive 4 h durations on a catchment area of 25 km2 and there resulted a DRH (after isolation of base flow in the flood flow hydrograph) with the following ordinates starting from the beginning of the rainfall. (Adopt trapezoidal formula)Time (hours)048121620242832364044DRH (ordinate m3/sec)0916202017.813.49.46.23.71.80 What is the ∅ index value? |
| A. | 0.149 cm/h |
| B. | 0.155 cm/h |
| C. | 0.161 cm/h |
| D. | 0.167 cm/h |
| Answer» C. 0.161 cm/h | |
| 5. |
A canal is 80 km long and has an average surface width of 15 m. If the evaporation measured in a class A pan is 0.5 cm/day, the volume of water evaporated in a month of 30 days is (in m3) |
| A. | 12600 |
| B. | 18000 |
| C. | 180000 |
| D. | 126000 |
| Answer» E. | |
| 6. |
Horton's infiltration equation was fitted to data from an infiltration test. It was found that the initial infiltration capacity was 20 mm/h, the final infiltration capacity was 5 mm/h and the exponential decay constant was 0.5 h-1. If the infiltration was at capacity rates, the total infiltration depth for a uniform atom of 10 h duration would be |
| A. | 80 mm |
| B. | 50 mm |
| C. | 30 mm |
| D. | 20 mm |
| Answer» B. 50 mm | |
| 7. |
For Western Ghats, the relation between runoff ‘R’ and rainfall ‘P’ (both in cm), given by Inglis and De Souza formula is: |
| A. | R = ks P |
| B. | R = kb P |
| C. | R = 0.85P - 30.5 |
| D. | \(R = \dfrac{1}{254} P(P-17.8)\) |
| Answer» D. \(R = \dfrac{1}{254} P(P-17.8)\) | |
| 8. |
A direct runoff hydrograph due to a storm idealized into a triangular shape has a peak flow rate of 60 m3 / s occurring at 25 hours from its start. If the base width of this hydrograph is 72 hours, and the catchment area is 777.6 km2, the runoff from the storm is |
| A. | 1 cm |
| B. | 2 cm |
| C. | 5 cm |
| D. | 10 cm |
| Answer» B. 2 cm | |
| 9. |
Maximum surface run-off is because of |
| A. | a flash storm |
| B. | Leaf shaped catchment |
| C. | Improved land management |
| D. | Presence of forest area |
| Answer» B. Leaf shaped catchment | |
| 10. |
Rain fall intensities in mm/hr at half an hour interval during a 4-hour storm were: 5, 9, 20, 13, 6, 8, 16 and 3 mm/hr. If the corresponding observed runoff is 27.45 million m3 from a basin having an area of 1830 Km2? The ϕ-index for storm is |
| A. | 6.25 mm/hr |
| B. | 6.7 mm/hr |
| C. | 7.2 mm/hr |
| D. | 7 mm/hr |
| Answer» D. 7 mm/hr | |
| 11. |
In the standard SCS-CN method of modelling runoff due to daily rainfall, if CN = 75, the runoff magnitude for a one-day rainfall of 100 mm is nearly: |
| A. | 17 mm |
| B. | 31 mm |
| C. | 41 mm |
| D. | 57 mm |
| Answer» D. 57 mm | |
| 12. |
A catchment area has 25% each of watertight roofs (impermeability factor = 0.9), areas with many buildings (impermeability factor = 0.8), Gardens ((impermeability factor = 0.1) and forest land (impermeability factor = 0.05) What is the average impermeability factor for the area? |
| A. | 0.050 |
| B. | 0.900 |
| C. | 0.800 |
| D. | 0.463 |
| E. | 0.450 |
| Answer» E. 0.450 | |