Hydraulic and Fluid Mechanics

161. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be

1. 2 meters of water column
2. 3 meters of water column
3. 5 meters of water column
4. 6 meters of water Column

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162. If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

1. 0.417 H^5/2
2. 1.417 H^5/2
3. 4.171 H^5/2
4. 7.141 H^5/2

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163. If the depth of water in an open channel is greater than the critical depth, the flow is called

1. Critical flow
2. Turbulent flow
3. Tranquil flow
4. Torrential flow

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164. If the depth of water in an open channel is less than the critical depth, the flow is called

1. Critical flow
2. Turbulent flow
3. Tranquil flow
4. Torrential flow

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165. If the surface of liquid is convex, men

1. Cohesion pressure is negligible
2. Cohesion pressure is decreased
3. Cohesion pressure is increased
4. There is no cohesion pressure

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166. If 'w' is the specifig weight of the lequid and 'k' the depth ofany point from the surface, then pressure intensity at that point will be

1. h
2. wh
3. w/h
4. h/w

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167. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is

1. Equal to
2. One-third
3. Two-third
4. Three-fourth

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168. In a depressed nappe

1. The pressure below the nappe is atmospheric
2. The pressure below the nappe is negative
3. The pressure above the nappe is atmospheric
4. The pressure above the nappe is negative

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169. In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

1. Double
2. Four times
3. Eight times
4. Sixteen times

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170. In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

1. Double
2. Four times
3. Eight times
4. Sixteen times

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