MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
Pick out the wrong statement about cavitation. |
| A. | Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation. |
| B. | Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities. |
| C. | Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise. |
| D. | Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades. |
| Answer» E. | |
| 1102. |
To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump. |
| A. | reciprocating |
| B. | centrifugal |
| C. | volute |
| D. | rotary vacuum |
| Answer» B. centrifugal | |
| 1103. |
Path followed by water jet issuing from the bottom of a water tank will be a |
| A. | parabola (vertex being at the opening). |
| B. | hyperbola. |
| C. | horizontal straight line. |
| D. | zig-zag path (which is geometrically undefined). |
| Answer» B. hyperbola. | |
| 1104. |
The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration. |
| A. | normal |
| B. | local |
| C. | convective |
| D. | tangential |
| Answer» C. convective | |
| 1105. |
Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions. |
| A. | Re << 1, accelerating flow |
| B. | Re >> 1, accelerating flow |
| C. | Re << 1, decelerating flow |
| D. | Re >>1, decelerating flow |
| Answer» E. | |
| 1106. |
The co-efficient of discharge of an orificemeter is a function of |
| A. | Reynolds number at the orifice. |
| B. | ratio of orifice dia to pipe dia. |
| C. | both (a) and (b). |
| D. | none of the above parameters, and has a constant value of 0.61. |
| Answer» D. none of the above parameters, and has a constant value of 0.61. | |
| 1107. |
Air vessel provided in a reciprocating pump |
| A. | smoothens the flow by avoiding pulsations. |
| B. | increases the volumetric efficiency of the pump. |
| C. | saves the pump from the danger of cavitation. |
| D. | none of these. |
| Answer» E. | |
| 1108. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm2. |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 1109. |
Prandtl number is a measure of the |
| A. | heat conduction to viscosity of a fluid. |
| B. | Cp/Cv of a fluid. |
| C. | elastic force to pressure force in the fluid flow. |
| D. | inertial force to elastic force in the fluid flow. |
| Answer» B. Cp/Cv of a fluid. | |
| 1110. |
Each term of the Bernoulli's equation written in the form, , represents the total energy per unit |
| A. | mass |
| B. | volume |
| C. | specific weight |
| D. | none of these |
| Answer» B. volume | |
| 1111. |
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential. |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 1112. |
Pressure drop in a packed bed for laminar flow is given by the __________ equation. |
| A. | Kozney-Karman |
| B. | Blake-Plummer |
| C. | Leva's |
| D. | Fanning friction factor |
| Answer» B. Blake-Plummer | |
| 1113. |
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an |
| A. | pitot tube |
| B. | venturimeter |
| C. | orificemeter |
| D. | rotameter |
| Answer» B. venturimeter | |
| 1114. |
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) |
| A. | |
| B. | 2y/3 |
| Answer» C. | |
| 1115. |
The time of oscillation of a floating body is |
| A. | longer, if metacentric height is increased. |
| B. | independent of the metacentric height. |
| C. | dependent on the buoyant forces only. |
| D. | none of these. |
| Answer» E. | |
| 1116. |
f = 16/NRe, is valid for |
| A. | turbulent flow |
| B. | laminar flow through an open channel |
| C. | steady flow |
| D. | none of these |
| Answer» E. | |
| 1117. |
In turbulent flow, a rough pipe has the same friction factor as a smooth pipe |
| A. | in the zone of complete turbulence. |
| B. | when the roughness projections are much smaller than the thickness of the laminar film. |
| C. | everywhere in the transition zone. |
| D. | when the friction factor is independent of the Reynold's number. |
| Answer» C. everywhere in the transition zone. | |
| 1118. |
Cd is always __________ Cc. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | either more or less than |
| Answer» B. less than | |
| 1119. |
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to |
| A. | x |
| B. | 1/x |
| C. | x |
| D. | 1/x |
| Answer» B. 1/x | |
| 1120. |
Pick out the wrong statement pertaining to fluid flow. |
| A. | The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5. |
| B. | The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe. |
| C. | Navier-Stokes equation is applicable to the analysis of viscous flows. |
| D. | Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids. |
| Answer» B. The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe. | |
| 1121. |
The ratio of inertial forces to viscous forces is called the __________ number. |
| A. | Weber |
| B. | Mach |
| C. | Froude |
| D. | Reynold |
| Answer» E. | |
| 1122. |
With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity |
| A. | widens |
| B. | squeezes |
| C. | does not change |
| D. | unpredictable from the data |
| Answer» D. unpredictable from the data | |
| 1123. |
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 ? |
| A. | 0.5 |
| B. | 0.67 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 1124. |
Rise of liquid in a capillary tube is due to |
| A. | cohesion |
| B. | adhesion |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1125. |
Discharge in laminar flow through a pipe varies |
| A. | as the square of the radius. |
| B. | inversely as the pressure drop. |
| C. | inversely as the viscosity. |
| D. | as the square of the diameter. |
| Answer» B. inversely as the pressure drop. | |
| 1126. |
A fluid is a substance, that |
| A. | has to be kept in a closed container. |
| B. | is almost incompressible. |
| C. | has zero shear stress. |
| D. | flows when even a small shear is applied to it. |
| Answer» E. | |
| 1127. |
A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ? |
| A. | Inertial and drag forces are important. |
| B. | Drag, gravitational and buoyancy forces are impportant. |
| C. | Drag force and gravitational forces are important. |
| D. | None of the above. |
| Answer» C. Drag force and gravitational forces are important. | |
| 1128. |
Ratio of inertial forces to surface tension forces is called the __________ number. |
| A. | Euler |
| B. | Froude |
| C. | Mach |
| D. | Weber |
| Answer» E. | |
| 1129. |
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter. |
| A. | 0.5 |
| B. | 5 |
| C. | 50 |
| D. | 100 |
| Answer» D. 100 | |
| 1130. |
A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be |
| A. | 100 |
| B. | 200 |
| C. | 320 |
| D. | 160 |
| Answer» C. 320 | |
| 1131. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft3/sec. |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 1132. |
In power law, , then the fluid is |
| A. | Newtonian |
| B. | dilatant |
| C. | thixotropic |
| D. | rheopectic |
| Answer» B. dilatant | |
| 1133. |
Sewage sludge is __________ type of non-Newtonion fluid. |
| A. | dilatant |
| B. | Bingham plastic |
| C. | Pseudo plastic |
| D. | none of these |
| Answer» C. Pseudo plastic | |
| 1134. |
A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is |
| A. | 5 |
| B. | 14.1 |
| C. | 56.22 |
| D. | 28.2 |
| Answer» E. | |
| 1135. |
Which of the following properties of a fluid is responsible for offering resistance to shear ? |
| A. | Surface tension. |
| B. | Viscosity. |
| C. | Specific gravity. |
| D. | All (a), (b), and (c). |
| Answer» C. Specific gravity. | |
| 1136. |
In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is |
| A. | 0.44 |
| B. | 0.044 |
| C. | 4.4 |
| D. | 44 |
| Answer» B. 0.044 | |
| 1137. |
Fanning friction factor equation applies to the __________ fluid flow. |
| A. | non-isothermal condition of |
| B. | compressible |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» E. | |
| 1138. |
Choose the set of pressure intensities that are equivalent. |
| A. | 4.33 psi, 10 ft. of water, 8.83 inches of Hg. |
| B. | 4.33 psi, 10 ft. of water, 20.7 inches of Hg. |
| C. | 10 psi, 19.7 ft. of water, 23.3 inches of Hg. |
| D. | 10 psi, 19.7 ft. of water, 5.3 inches of Hg. |
| Answer» B. 4.33 psi, 10 ft. of water, 20.7 inches of Hg. | |
| 1139. |
In fluid flow, the stagnation point is defined as a point, where the __________ is zero. |
| A. | flow velocity |
| B. | pressure |
| C. | total energy |
| D. | all (a), (b) and (c) |
| Answer» B. pressure | |
| 1140. |
The bulk modulus of elasticity of a liquid |
| A. | is zero for incompressible liquid. |
| B. | decreases with pressure. |
| C. | is independent of temperature & pressure. |
| D. | increases with pressure. |
| Answer» E. | |
| 1141. |
Low specific speed of a pump implies that, it is a/an __________ pump. |
| A. | axial flow |
| B. | centrifugal |
| C. | mixed flow |
| D. | none of these |
| Answer» C. mixed flow | |
| 1142. |
A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by |
| A. | decreasing the size of the inlet pipe. |
| B. | increasing the size of the inlet pipe. |
| C. | lowering the pump position. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1143. |
Each term in Bernaulli's equation represents the __________ of the fluid. |
| A. | energy per unit mass |
| B. | energy per unit weight |
| C. | force per unit mass |
| D. | none of these |
| Answer» C. force per unit mass | |
| 1144. |
The buoyant force acting on a floating body is dependent on the |
| A. | viscosity of the liquid. |
| B. | weight of the liquid displaced. |
| C. | depth of immersion of the body. |
| D. | surface tension of the liquid. |
| Answer» C. depth of immersion of the body. | |
| 1145. |
Drag is defined as the force exerted by the |
| A. | fluid on the solid in a direction opposite to flow. |
| B. | fluid on the solid in the direction of flow. |
| C. | solid on the fluid. |
| D. | none of these. |
| Answer» C. solid on the fluid. | |
| 1146. |
Pipes having diameter 14 inches or more are designated by their |
| A. | outside diameter |
| B. | inside diameter |
| C. | schedule number |
| D. | none of these |
| Answer» B. inside diameter | |
| 1147. |
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid. |
| A. | dilatant |
| B. | pseudoplastic |
| C. | Bingham plastic |
| D. | Newtonion |
| Answer» B. pseudoplastic | |
| 1148. |
For the same flow rate of a fluid, the pressure drop is the least for |
| A. | venturimeter |
| B. | orificemeter |
| C. | flow-nozzle |
| D. | Δp is same for all |
| Answer» B. orificemeter | |
| 1149. |
What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ? |
| A. | Penstock |
| B. | Siphon |
| C. | Tunnel |
| D. | Pressure pipeline |
| Answer» C. Tunnel | |
| 1150. |
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | increases linearly |
| Answer» D. increases linearly | |