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This set of Irrigation Engineering Multiple Choice Questions & Answers (MCQs) focuses on Irrigation Engineering Set 6
Q1 | Interception losses are due toi) evaporationii) transpirationiii) stream flowThe correct answer is
- only (i)
- (i)and(ii)
- (ii) and (iii)
- (i), (ii) and (iii)
Q2 | A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If
- 4.5 cm
- 6.0 cm
- 7.5 cm
- 9.0 cm
Q3 | Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
- slope-area method
- area-velocity method
- moving boat method
- ultra-sonic method
Q4 | To determine the discharge at a section in a stream from its rating curve, the required data arei) slope of water surface at the sectionii) stage at the sectioniii) current meter readings at the section The correct answer is
- (i) and (ii)
- (ii) and (iii)
- only (ii)
- only (iii)
Q5 | The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000)willbe
- V2 Q m3/sec
- 0.5 Q mVsec
- 2 Q m3/sec
- 4 Q m3/sec
Q6 | The stream which does not have any base flow contribution is called
- perennial stream
- intermittent stream
- ephemeral stream
- none of the above
Q7 | The flow-mass curve is graphical representation of
- cumulative discharge and time
- discharge and percentage probability of flow being equaled or exceeded
- cumulative discharge, volume and time in chronological order
- discharge and time in chronological order
Q8 | If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that
- demand cannot be met by inflow
- reservoir was not full at the beginning
- both (a) and (b)
- none of the above
Q9 | The shape of recession limb of a hydrograph depends upon
- basin characteristics only
- storm characteristics only
- both (a) and (b)
- none of the above
Q10 | Instantaneous unit hydrograph is a hydrograph ofi) unit durationii) unit rainfall excessiii) infinitely small durationiv) infinitely small rainfall excessThe correct answer is
- (i) and (ii)
- (i)and(iv)
- (ii) and (iii)
- (iii) and (iv)
Q11 | 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 hydro graph is
- 0.2 x 106
- 0.6 x 106
- 2.4 xlO6
- 7.2 xlO6
Q12 | A unit hydro graph has one unit of
- rainfall duration
- rainfall excess
- time base of direct runoff
- discharge
Q13 | The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
- 20 3/sec
- 25 m3/sec
- 30 m3/sec
- 35 m3/sec
Q14 | To estimate the magnitude of a flood with a return period of T years, Gumbel's distribution method requires the following data pertaining to annual flood seriesi) mean valueii) standard deviationiii) length of recordiv) coefficient of skewThe correct answer is
- (i) and (ii)
- (i),(ii) and (iii)
- (i), (ii) and (iv)
- (i), (ii), (iii) and (iv)
Q15 | For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is
- N/(m+l)
- m/(N+l)
- m/N
- (N+l)/m
Q16 | If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
- 1 + (0.9)010
- 1 - (0.9)°l0
- 1/(1-0.9°10)
- 1/(1+ 0.9010)
Q17 | The crest level in a barrage is kept at a
- low
- high
- moderate
Q18 | When the full supply level (F.S.L.) of the canal is much below the bed level of the drainage trough, then the cross drainage provided is called syphon aqueduct.
- Yes
- No
Q19 | A spoil bank is formed when the
- canal has steel bed slope
- canal section is too large
- volume of excavation is in excess of the embankment filling
- canal alignment is meandrous
Q20 | When the drain is over the canal, the structure provided is known as
- aqueduct
- super-passage
- canal syphon
- syphon aqueduct
Q21 | A levee on flood
- increases the water surface elevation of the river at flood
- decreases the surface slope of the stream above the leveed portion
- increases the velocity and scouring action through leveed section
- all of the above
Q22 | The primary cause of meandering is the excess of total charge during floods, when excess of turbulence is developed.
- TRUE
- FALSE
Q23 | In order to estimate the high flood discharge in fan-shaped catchment, the formula used is
- Dicken's formula
- Ryve's formula
- Inglis formula
- Fanning's formula
Q24 | The capacity of escape channel should not be less than
- 20%
- 30%
- 40%
- 50%
Q25 | The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called
- base period
- crop period
- kor period
- none of these