Irrigation Engineering - Practice Test

[#186] The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are i) Water pressure ii) Self weight iii) Uplift iv) Pressure due to earthquake The correct answer is

(A) Only (ii)

(B) (i), (ii) and (iii)

(C) (i), (ii) and (iv)

(D) (i), (ii), (iii) and (iv)

Correct Answer

(A) Only (ii)

[#187] If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is

(A) R (θ + tan θ)

(B) R (θ + cot θ)

(C) R2 (θ + tan θ)

(D) R2 (θ + cot θ)

Correct Answer

(D) R2 (θ + cot θ)

[#188] If D 1 and D 2 are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is

(A) $$frac{{{{left( {{{ ext{D}}_2} - {{ ext{D}}_1}} ight)}^3}}}{{{{ ext{D}}_1}{{ ext{D}}_2}}}$$

(B) $$frac{{{{left( {{{ ext{D}}_2} - {{ ext{D}}_1}} ight)}^3}}}{{2{{ ext{D}}_1}{{ ext{D}}_2}}}$$

(C) $$frac{{{{left( {{{ ext{D}}_2} - {{ ext{D}}_1}} ight)}^3}}}{{3{{ ext{D}}_1}{{ ext{D}}_2}}}$$

(D) $$frac{{{{left( {{{ ext{D}}_2} - {{ ext{D}}_1}} ight)}^3}}}{{4{{ ext{D}}_1}{{ ext{D}}_2}}}$$

Correct Answer

(D) $$frac{{{{left( {{{ ext{D}}_2} - {{ ext{D}}_1}} ight)}^3}}}{{4{{ ext{D}}_1}{{ ext{D}}_2}}}$$

[#189] For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

(A) Bligh's theory

(B) Electrical analogy method

(C) The relaxation method

(D) Khosla's method of independent variables

Correct Answer

(D) Khosla's method of independent variables

[#190] The main function of a divide wall is to

(A) control the silt entry in the canal

(B) prevent river floods from entering the canal

(C) separate the undersluices from weir proper

(D) provide smooth flow at sufficiently low velocity

Correct Answer

(C) separate the undersluices from weir proper

Explanation

Solution: The main function of a divide wall is to separate the undersluices from the weir proper and provide a smooth flow of water by guiding it efficiently. It helps in: - Preventing crosscurrents and turbulence that may interfere with the proper functioning of the undersluices. - Controlling sedimentation by ensuring that silt-laden water flows towards the undersluices for easy disposal. - Protecting the structural integrity of the weir by minimizing the impact of high-velocity flows.

Irrigation Engineering - Study Mode

[#186] The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are i) Water pressure ii) Self weight iii) Uplift iv) Pressure due to earthquake The correct answer is

Correct Answer

[#187] If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is

Correct Answer

[#188] If D 1 and D 2 are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is

Correct Answer

[#189] For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

Correct Answer

[#190] The main function of a divide wall is to

Correct Answer

Explanation