1.Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds

2. Which one is in a state of failure?

3. In which device the momentum generated by one fluid is used for moving another fluid

4. Which element would regain its original shape if a small shear force is applied on it and then removed

5. The normal stress is the same in all directions at a point in a fluid, when the fluid is

6. N. second/m2 is

7. If a person studies about a fluid which is at rest, what will you call his domain of study?

8. The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime ?

9. Dimension of absolute viscosity is

10. Which one of the following is the dimension of mass density?

11. Due to which property the mercury does not wet the glass

12. Head developed by a centrifugal pump depends on its

13. The head loss in turbulent flow in a pipe varies

14.Most commonly used joint in the underground pipe lines is the

15.Schedule number of a pipe, which is a measure of its wall thickness, is given by

16. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

17. With increasing flow rate, the hydraulic efficiency of a centrifugal pump

18.During a weak jump, the value of Froude lies in between________

19.The velocity profile for turbulent flow through a closed conduit is

20. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. What property will be same for both if 2 pipes of same hydraulic roughness are compared

21. In which type of matter, one won’t find a free surface?

22. Molten soap mass is transported by a __________ pump.

23. Which of the following denotes the effect of compressibility in fluid flow ?

24. The specific volume of a liquid is the reciprocal of

25. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

26. The terminal velocity of a small sphere settling in a viscous fluid varies as the

27. If the discharge of a centrifugal pump is throttled, then its suction lift

28. Foot valves provided in pumps are __________ valves.

29. At high Reynolds number

30. Power loss in an orificemeter is __________ that in a venturimeter.

31. What is the normal range of exit cone angle of a venturimeter ?

32. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. What will be the settling velocity of a particle B having diameter of 20 microns in the same oil

33. The pitot static tube does not measure the __________ pressure.

34. In fluid flow, cavitation is caused, if the

35. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

36. The drag coefficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 106m2/s).

37. For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

38. The maximum delivery pressure of compressors can be upto __________ atmospheres.

39. Dimension of surface tension is(where, F = force, L = length)

40. Which of the following is not a dimensionless parameter ?

41. Coefficient of velocity is __________ the coefficient of discharge.

42. All pipes of a particular nominal size have the same

43. For the transfer of solution of thick slurry, the pump used is a __________ pump.

44. Which one of the following is the dimension of specific gravity of a liquid?

45. Which of the following is not concerned with the fluidparticle interaction ?

46. Pick out the wrong statement.

47. Pressure drag does not depend upon the

48. Which one of the following is the dimension of specific weight of a liquid?

49. __________ pumps are axial flow pumps.

50. During settling of a particle in a fluid for what range of particle size (in microns) would the Brownian movement be prominent

51. For a particle settling in water at its terminal settling velocity, which of the following is true ?

52. A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 103 m. If the top most plate moves at 1 m/s then the shear stress on the plate would be

53. Pick out the correct statement.

54. Shear stress in a fluid flowing in a round pipe

55. Which material is used for making resistance wire used in a hot wire anemometer

56. Two dimensional stream function

57. What causes cavitation in centrifugal pump ?

58. Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.

59. A hydraulic ram acts as a/an __________ pump.

60. What is the ratio of avg. fluid velocity to max velocity in a laminar flow of a Newtonion fluid

61. Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively).

62. The discharge through a venturimeter depends upon

63. The line of action of the buoyant force passes through the centre of gravity of the

64. The friction factor for turbulent flow in a hydraulically smooth pipe

65. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and

66. Which among the following is formula for force when it acts along the direction of flow?

67. What causes convective acceleration in fluid flow ?

68. The Stoke's stream function applies to the

69. Slugging in a fluidised bed can be avoided by using

70. The ratio of width to depth for the most economical rectangular section in open channel flow is

71. The simple pitot tube measures the __________ pressure.

72. The mass of water per sec striking the plate is_________

73. Capacity of a hydraulic accumulator is defined in terms of maximum

74. With diminishing crosssectional area in case of subsonic flow in a converging nozzle, the

75. If “Re” denotes Reynolds number then the boundary layer separation would be characterised by which condition

76. Manometers measure the __________ pressure.

77. Which of the following fluid forces are not considered in the NavierStoke's equation?

78. Which of the following may be termed as a variable orifice flowmeter ?

79. If the fluid has specific weight of 10N/m^{3} for a volume of 100dm^{3} on a planet which is having acceleration due to gravity, g=20m/s^{2} then what will be its specific weight on a planet having a value of g= 4m/s^{2}

80. In turbulent flow, a rough pipe has the same friction factor as a smooth pipe

81. Air vessel provided in a reciprocating pump

82. Bernoulli's equation is dependent on the

83.The capacity of an accumulator is the maximum

84. With increase in the temperature, viscosity of a liquid

85. Venacontracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'

86. The value of the surface tension of an ideal fluid is

87. The pump impeller and the turbine runner in a hydraulic torque converter

88. If two fluids 1 and 2 have mass densities of p1 and p2 and specific volumes v1 and v2 then

89. Reciprocating pumps compared to centrifugal pumps

90. The fluid property which matters for falling rain drops to acquire spherical shape is its

91. We cannot use a pitot tube to measure

92. Boundary layer separation occurs when the

93. The head loss in turbulent flow in a pipe varies

94. The actual velocity at the vena contracta during flow thru an orifice from a reservoir is

95. For the free settling of a spherical particle through a fluid, the slope of, CDlog NRe , plot is

96. A centrifugal pump loses prime after starting. The reason of this trouble may be

97. A jet strikes a curved plate at its ______

98. Venturimeter and orificemeter measures the __________ of the fluid.

99. Surge tanks are provided in high pressure water pipelines to

100. Working principle of manometer comprises of balancing a column of liquid against the pressure to be measured. Which pressure is measured by inclined tube manometer

101. Isotropic turbulence occurs

102. The coefficient of drag and lift for an incompressible fluid depends on the

103. Which one of the following is the dimension of specific volume of a liquid?

104. Euler's equation of motion states, that at every point, the

105. Navier Stokes equation is used in law of conservation of

106. Hydraulic intensifier is used for increasing the

107. Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of

108. Euler's equation of motion is a statement expressing

109. During ageing of fluid carrying pipes, the

110. Pick out the wrong statement.

111. Mass velocity is independent of temperature & pressure, when the flow is

112. Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

113. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).

114. A differential pressure cell is used for

115. Which one of the following is the unit of specific weight?

116. If more than two branches of pipes are to be connected at the same point, then use a/an

117. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.

118. Acceleration head in a reciprocating pump

119. The ratio of inertial forces to elastic forces is called the __________ number.

120. The value of the viscosity of an ideal fluid is

121. Which one of the following is the unit of mass density?

122. Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.

123. The temperature in isentropic flow

124. If there is bucket full of oil and bucket full of water and you are asked to lift them, which one of the two will require more effort given that volume of buckets remains same?

125. A fluid element has a velocity V = y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is

126. Drag force acting on a body does not depend upon the

127. Centrifugal pump is normally classified on the basis of the

128. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

129. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature )

130. Check valves are used

131. Velocity distribution for flow between two fixed parallel plates

132. Priming is needed in a __________ pump.
132. Priming is needed in a __________ pump.

133. An ideal nozzle design aims at

134. Which of the fluid forces are not considered in the Reynold's equation of flow ?

135. For ideally incompressible fluid, the Mach number will be

136. A mono pump is a __________ pump.

137. Higher specific speed (200500) of a centrifugal pump indicates that the pump is of __________ flow type.

138. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure
Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

139. An ideal fluid is

140. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)

141. Boundary layer separation is caused by the

142. With increase in temperature, the vapor pressure of liquids

143. The ratio of wall drag to total drag in the Stoke's law range is

144. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

145. A pitchedblade turbine draws __________ a straight blade turbine.

146. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a

147. A centrifugal pump is called a turbine pump, if it is having a

148. Remote control valve is a __________ valve.

149. Calculate the specific weight and weight of 20dm3 of petrol of specific gravity 0.6.

150. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?

151. Centre of pressure in an immersed body is __________ the centre of gravity.

152. The centre of pressure is

153. The uniformity of a gas fluidised bed depends upon the __________ of the solid particles.

154. Pascal law is not applicable for a/an __________ fluid.

155. In a fluidised bed reactor

156. A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific weight of the liquid will be

157. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.

158. A perfect gas

159. In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.

160. Speed of sound in an ideal gas depends on its

161. If 200m3 of fluid has a weight of 1060N measured on the planet having acceleration due to gravity 6.625m/s2, what will be it’s specific volume?

162. A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).

163. If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

164. In fluid flow, the boundary layer separation can not occur

165. For a given fluid flow rate, which of the following incurs maximum head loss ?

166. Which of the following assumptions enables the Euler's equation of motion to be integrated ?

167. Which among the following is the formula for Force when it strikes the plate?

168. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.

169. Which of the following is the most common pump for pumping either raw sewage or sludge ?

170. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter

171. 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

172. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have

173. To derive pav^{2}, we take final velocity minus the initial velocity.

174. Which of the following pipe bends will incur the largest head loss ?

175. Which is the most efficient and best for measuring very small flow rate of gases ?

176. When the water is warm, the height to which it can be lifted by a pump

177. Specific gravity is what kind of property?

178. Pipes having diameter 14 inches or more are designated by their

179. Viscosity of water at 40°C lies in the range of

180. 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.

181. An compressible fluid’s specific gravity was measured on earth, on a planet having acceleration due to gravity 5.5 times that of earth, and in space at STP. Where will it be having highest value?

182. The dimension of kinematic viscosity is

183. 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

184. Turbulent flow generally occurs for cases involving

185. Lower BWG means __________ of the tube.

186. 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.

187. Which among the following is a formula for force when it acts perpendicular to the direction of flow?

188. The Prandtl mixing length is

189. N2Re/NFr is called the __________ number.

190. 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

191. Selfpriming centrifugal pump can be used for

192. Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

193. Bernoull's equation does not apply to the functioning of a/an

194. What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'Vavg'?

195. Pascal's law is valid, only when the fluid is

196. The pressure head of a flow meter remains constant for

197. A venturimeter can not be used for the direct measurement of

198. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double

199. Which of the following is used for very accurate measurement of flow of gas at low velocity ?

200. The rate of shear versus the shear stress curves are time dependent for __________ fluid.

201. In Newton's law range, the drag coefficient for the motion of spherical particle in a stationary fluid is

202. The velocity component after striking the surface will be________

203. A pressure of 10 m head of water is equivalent to __________ kN/m2.

204. A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be

205. The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is

206. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship.

207. Maintenance cost of a __________ pump for a particular duty is the least.

208. Choking in case of pipe flow means that a

209. Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.

210. The nominal size of a hose pipe is specified by its

211. At what angle does the jet deflect after striking a stationery vertical plate?

212. Transition from laminar flow to turbulent flow is aided by the

213. For flow of fluids through packed bed, the superficial velocity is

214. Cd is always __________ Cc.

215. Which of the following is an undesirable property of a manometric liquid ?

216. Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

217. In a stationery vertical plate, the jet after striking the plate will move _______

218. The speed of sound in an ideal gas varies as the

219. The maximum head that can be developed by a single impeller is __________ ft.

220. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

221. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?

222. Foot valve provided in the pump is a __________ valve.

223. Force exerted by a jet on a moving plate happens in how many cases?

224. The discharge coefficient for an orificemeter does not depend upon the

225. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

226 .An equipotential line is __________ to the velocity vector at every point.

227. Path followed by water jet issuing from the bottom of a water tank will be a

228. Which of the following produces maximum pressure difference for transportation of gases ?

230. Drag coefficient in hindered settling is __________ that in free settling.

231. Efficiency of power transmission (η) through a circular pipe is given by (ht  hf)/ht, which has a maximum value of __________ percent.

232. One dimensional fluid flow implies the

233. __________ forces act on a particle moving through a stationary fluid.

234. Hydraulic radius is the ratio of

235. The unit of bulk modulus of elasticity for a liquid in S.I. unit is

236. Power requirement of fans having constant wheel diameter varies __________ fan speed.

237. In the low Reynolds number region, the drag force on a sphere is proportional to

v238. The continuity equation

239. The value of the Bulk Modulus of an ideal fluid is

240. Experimental study of laminar fluid flow through a circular tube was conducted by

241. The most economical flow control valve for use with large diameter pipes is a

242. Each term in Bernaulli's equation represents the __________ of the fluid.

243. Which of the following is a dimensionless parameter ?

244. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will

245. Buoyant force

246. For the laminar flow of a fluid in a circular pipe of radius R, the HagenPoisseule equation predicts the volumetric flow rate to be proportional to

247. Interstage coolers are provided in a multistage compressor to

248. Reynolds number is the ratio of

249. The value of the compressibility of an ideal fluid is
