151. For a given fluid flow rate, which of the following incurs maximum head loss ?
152. Which of the following assumptions enables the Euler's equation of motion to be integrated ?
153. In case of a pipe exit fitted with a nozzle, the
154. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
155. Which of the following is the most common pump for pumping either raw sewage or sludge ?
156. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.
157. For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is
158. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have
159. Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)
160. Which of the following pipe bends will incur the largest head loss ?
161. Which is the most efficient and best for measuring very small flow rate of gases ?
162. When the water is warm, the height to which it can be lifted by a pump
163. Pipes having diameter 14 inches or more are designated by their
164. Viscosity of water at 40°C lies in the range of
165. A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Head = 8 metres
Flow = 1000 litres/minutes.
If its speed is halved, the new discharge will be __________ litres/minute.
166. The dimension of kinematic viscosity is
167. A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is
168. Turbulent flow generally occurs for cases involving
169. Lower BWG means __________ of the tube.
170. For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.
171. The Prandtl mixing length is
172. N2Re/NFr is called the __________ number.
173. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis". The centre of pressure of a rectangular surface (of width 'w') immersed vertically in a static mass of fluid is at a depth of(where, y = depth of the liquid)
174. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1
175. Self-priming centrifugal pump can be used for