Irrigation Engineering

121. The water face of the guide banks, is protected by

1. One men stone pitching
2. Two man stone pitching
3. Three man stone pitching
4. Four man stone pitching

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122. The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than

1. 10 cm
2. 20 cm
3. 30 cm
4. 40 cm

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123. The width of a meander belt is the transverse distance between

1. Apex point of one curve and apex point of the reserve curve
2. Apex point and the crossing
3. Two banks of meandering river
4. None of these

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124. To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls

1. Of R.C.C. or steel plate 8 cm thick
2. Ofheight ⅓rd to ¼th the depth of water in the main canal
3. Spaced at interval of 1½ times their heights
4. All the above

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125. To hold hydraulic jumps, baffle walls are provided in

1. Sarda type falls
2. English type falls
3. Montague type falls
4. Vertical type falls

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126. Useful soil moisture for plant growth, is

1. Capillary water
2. Gravity water
3. Hygroscopic water
4. Chemical water

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127. 'V' and 'R' are the regime mean velocity and hydraulic mean depth respectively in metres. Lacey's silt factor f is

1. 2V²/√3 R
2. 3V²/4R
3. 5V²/2R
4. 2V²/5R

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128. When a canal and a drainage approach each other at the same level, the structure so provided, is

1. An aqueduct
2. A syphon
3. A level crossing
4. Inlet and outlet

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129. When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called

1. Syphon
2. Aqueduct
3. Super passage
4. Syphon-aqueduct

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130. When a canal is carried over a natural drainage, the structure provided, is known as

1. Syphon
2. Aqueduct
3. Super passage
4. Syphon-aqueduct

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