Irrigation Engineering MCQ Questions & Answers

61

A land is known as waterlogged

A) when the permanent wilting point is reached B) when gravity drainage has ceased C) capillary fringe reaches the root zone of plants D) none of the above

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Answer & Solution

Answer: Option C

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62

When the reservoir is full, the maximum compressive force in a gravity dam is produced

A) at the toe B) at the heel C) within the middle third of base D) at centre of base

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Answer: Option A

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63

The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is

A) 8 cm B) 10 cm C) 12 cm D) 14 cm

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Answer: Option C

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64

Fundamental momentum equation for a hydraulic jump, is

A) $${\text{D}}_1^2 - {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_1} - {{\text{V}}_2}} \right)$$ B) $${\text{D}}_2^2 - {\text{D}}_1^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_1} - {{\text{V}}_2}} \right)$$ C) $${\text{D}}_1^2 - {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_2} - {{\text{V}}_1}} \right)$$ D) $${\text{D}}_1^2 + {\text{D}}_2^2 = \frac{{2{\text{q}}}}{{\text{g}}}\left( {{{\text{V}}_2} - {{\text{V}}_1}} \right)$$

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Answer & Solution

Answer: Option B

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65

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

A) 20 m³/sec B) 25 m³/sec C) 30 m³/sec D) 35 m³/sec

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Answer: Option B

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66

The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by

A) 0.99¹⁰ B) 1 - 0.99¹⁰ C) 0.9¹⁰⁰ D) 1 - 0.9¹⁰⁰

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Answer: Option B

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67

Solution of Laplacian equation in three dimensions $$\frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{x}}^2}}} + \frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{y}}^2}}} + \frac{{{{\text{d}}^2}\varphi }}{{{\text{d}}{{\text{z}}^2}}} = 0$$ of water in a syphon, is done by

A) Analytical method B) Khosla's method C) Method of relaxation D) Unwin's method

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Answer: Option C

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68

In case of a trapezoidal notch fall

A) Top width of the notch is kept between $${\frac{3}{4}^{{\text{th}}}}$$ of full water depth above the sill of the notch B) Top length of the piers should not be less than their thickness C) Splay upstream from the notch section is 45° D) Splay downstream from the notch section is $$22{\frac{1}{2}^ \circ }$$ E) All the above

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Answer: Option E

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Irrigation Engineering MCQ Questions & Answers | Civil Engineering