MCQOPTIONS
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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.
| 951. |
For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are |
| A. | h1 > h2 < h3 |
| B. | h1 > h2 > h3 |
| C. | h2 < h1 < h3 |
| D. | h1 < h2 < h3 |
| Answer» B. h1 > h2 > h3 | |
| 952. |
A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 953. |
Which of the following facilitates close control of flow of fluids ? |
| A. | Gate valve |
| B. | Globe valve |
| C. | Butterfly valve |
| D. | Check valve |
| Answer» C. Butterfly valve | |
| 954. |
For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is |
| A. | 0.5 |
| B. | 1 |
| C. | 0.66 |
| D. | < 0.5 |
| Answer» C. 0.66 | |
| 955. |
The most serious disadvantage of an orificemeter is that |
| A. | it is not very accurate. |
| B. | it is very costly. |
| C. | most of the pressure drop is not recoverable. |
| D. | it is not suitable for measuring gas flow. |
| Answer» D. it is not suitable for measuring gas flow. | |
| 956. |
The simple pitot tube does not measure the |
| A. | static pressure. |
| B. | dynamic pressure. |
| C. | velocity at the stagnation point. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 957. |
Euler's equation of motion is a statement expressing |
| A. | conservation of mass. |
| B. | conservation of energy. |
| C. | Newton's first law of motion. |
| D. | Newton's second law of motion. |
| Answer» B. conservation of energy. | |
| 958. |
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is |
| A. | 4(Ro-Ri) |
| B. | Ro-Ri |
| C. | 2(Ro-Ri) |
| D. | Ro + Ri |
| Answer» D. Ro + Ri | |
| 959. |
Turbine impeller |
| A. | produces only radial current. |
| B. | produces only tangential current. |
| C. | is effective over wide range of viscosities. |
| D. | does not produce tangential current. |
| Answer» D. does not produce tangential current. | |
| 960. |
What is the maximum theoretical suction lift (metres) of a reciprocating pump ? |
| A. | 5 |
| B. | 10 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 961. |
The __________ is measured by a piezometric opening. |
| A. | dynamic pressure |
| B. | static pressure |
| C. | total pressure |
| D. | point velocity |
| Answer» D. point velocity | |
| 962. |
Small pressure differences in liquids is measured using a/an |
| A. | U-tube manometer. |
| B. | inclined tube manometer. |
| C. | pitot tube. |
| D. | none of these. |
| Answer» C. pitot tube. | |
| 963. |
Reciprocating pumps compared to centrifugal pumps |
| A. | deliver liquid at uniform pressure. |
| B. | can handle slurries more efficiently. |
| C. | are not subject to air binding. |
| D. | can be operated with delivery valve closed. |
| Answer» D. can be operated with delivery valve closed. | |
| 964. |
The exit cone angle in case of a standard venturimeter is __________ the entrance cone angle. |
| A. | smaller than |
| B. | greater than |
| C. | equal to |
| D. | either (a) or (b) |
| Answer» B. greater than | |
| 965. |
Plunger pumps are used for |
| A. | higher pressure |
| B. | slurries |
| C. | viscous mass |
| D. | none of these |
| Answer» B. slurries | |
| 966. |
One dimensional fluid flow implies the |
| A. | flow in straight lines only. |
| B. | uniform flow. |
| C. | steady uniform flow. |
| D. | flow in which transverse components are zero. |
| Answer» E. | |
| 967. |
In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter. |
| A. | inverse |
| B. | square root |
| C. | second power |
| D. | first power |
| Answer» C. second power | |
| 968. |
Pick out the wrong statement about a streamline. |
| A. | It is always parallel to the main direction of the fluid flow. |
| B. | It is a line across which there is no flow and it is equivalent to a rigid boundary. |
| C. | Streamlines intersect at isolated point of zero velocity and infintie velocity. |
| D. | The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity. |
| Answer» B. It is a line across which there is no flow and it is equivalent to a rigid boundary. | |
| 969. |
N. second/m2 is |
| A. | the S.I. unit of dynamic viscosity. |
| B. | the S.I. unit of kinematic viscosity. |
| C. | equivalent to one poise. |
| D. | equivalent to one stoke. |
| Answer» B. the S.I. unit of kinematic viscosity. | |
| 970. |
The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the |
| A. | static submergence. |
| B. | net positive suction head (NPSH). |
| C. | cavitation sensitivity. |
| D. | priming. |
| Answer» C. cavitation sensitivity. | |
| 971. |
The velocity for subsonic flow in a pipeline |
| A. | increases in the downstream direction. |
| B. | is constant. |
| C. | decreases in the downstream direction. |
| D. | is independent of the area of flow. |
| Answer» B. is constant. | |
| 972. |
Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | none of these |
| Answer» C. same as | |
| 973. |
Pick out the correct statement pertaining to venturimeter. |
| A. | A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward. |
| B. | The co-efficient of contraction of a venturimeter is always unity. |
| C. | For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected. |
| D. | none of these. |
| Answer» E. | |
| 974. |
Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics ? |
| A. | Archimedes principle. |
| B. | Newton's second law of motion. |
| C. | Hooke's law. |
| D. | Newton's third law of motion. |
| Answer» D. Newton's third law of motion. | |
| 975. |
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type. |
| A. | axial |
| B. | radial |
| C. | mixed |
| D. | none of these |
| Answer» B. radial | |
| 976. |
For the same terminal conditions and fitting size, the least friction loss is incurred in a/an |
| A. | T-joint |
| B. | union |
| C. | 45° elbow |
| D. | 90°bend |
| Answer» C. 45¬∞ elbow | |
| 977. |
A piezometer provided in the pipe measures |
| A. | friction factor |
| B. | static pressure |
| C. | dynamic pressure |
| D. | none of these |
| Answer» C. dynamic pressure | |
| 978. |
Manometers measure the __________ pressure. |
| A. | vacuum as well as the atmospheric |
| B. | difference in |
| C. | absolute |
| D. | gage |
| Answer» C. absolute | |
| 979. |
Deformation drag, which is caused by widespread deformation of fluid around the immersed body |
| A. | occurs when NRe is very small. |
| B. | is primarily a friction drag. |
| C. | is independent of body length. |
| D. | depends mainly on cross-sectional shape. |
| Answer» B. is primarily a friction drag. | |
| 980. |
At low Reynolds number |
| A. | viscous forces are unimportant. |
| B. | viscous forces control. |
| C. | viscous forces control and inertial forces are unimportant. |
| D. | gravity forces control. |
| Answer» D. gravity forces control. | |
| 981. |
Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter. |
| A. | two |
| B. | three |
| C. | four |
| D. | eight |
| Answer» D. eight | |
| 982. |
Which of the following produces maximum pressure difference for transportation of gases ? |
| A. | Vaccum pumps |
| B. | Blowers |
| C. | Fans |
| D. | Compressors |
| Answer» E. | |
| 983. |
Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg. |
| A. | 1 |
| B. | 0.1 |
| C. | 0.01 |
| D. | 0.001 |
| Answer» D. 0.001 | |
| 984. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is$ |
| A. | 12 mm/s |
| B. | 16 mm/s |
| C. | 24 mm/s |
| D. | 28 mm/s |
| Answer» C. 24 mm/s | |
| 985. |
The specific speed of a pump is defined as the speed of a unit of such a size, that it |
| A. | delivers unit discharge at unit head. |
| B. | requires unit power for unit head. |
| C. | delivers unit discharge at unit power. |
| D. | none of these. |
| Answer» B. requires unit power for unit head. | |
| 986. |
With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the |
| A. | velocity increases |
| B. | pressure decreases |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 987. |
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | be quadrupled |
| Answer» B. decrease | |
| 988. |
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ? |
| A. | Rotational |
| B. | Unsteady |
| C. | Turbulent |
| D. | Non-uniform |
| Answer» E. | |
| 989. |
Surge tanks are provided in high pressure water pipelines to |
| A. | store a definte quantity ofwater all the time, |
| B. | reduce the water hammer. |
| C. | facilitate easy dismantling of pipeline for cleaning and maintenance. |
| D. | none of these. |
| Answer» C. facilitate easy dismantling of pipeline for cleaning and maintenance. | |
| 990. |
Boundary layer separation occurs when the |
| A. | pressure reaches a minimum. |
| B. | cross-section of the channel is reduced. |
| C. | valve is closed in a pipeline. |
| D. | velocity of sound is reached. |
| Answer» C. valve is closed in a pipeline. | |
| 991. |
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively). |
| A. | G is above B |
| B. | B is above G |
| C. | B & coincide |
| D. | none of these |
| Answer» C. B & coincide | |
| 992. |
A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is |
| A. | 200 N |
| B. | 400 N |
| C. | 2000 N |
| D. | 4000 N |
| Answer» E. | |
| 993. |
What is the speed of sound (m/sec) in ordinary water ? |
| A. | 1500 |
| B. | 330 |
| C. | 1000 |
| D. | 3000 |
| Answer» B. 330 | |
| 994. |
With increase in temperature, the vapor pressure of liquids |
| A. | increases |
| B. | increases linearly |
| C. | decreases |
| D. | remains constant |
| Answer» B. increases linearly | |
| 995. |
The pressure head of a flow meter remains constant for |
| A. | venturimeter |
| B. | orificemeter |
| C. | rotameter |
| D. | pitot tube |
| Answer» D. pitot tube | |
| 996. |
The value of critical Reynolds number for pipe flow is |
| A. | 1300 |
| B. | 10000 |
| C. | 100,s000 |
| D. | none of these. |
| Answer» B. 10000 | |
| 997. |
The most economical flow control valve for use with large diameter pipes is a |
| A. | butterfly valve |
| B. | globe valve |
| C. | needle valve |
| D. | none of these |
| Answer» B. globe valve | |
| 998. |
The line of action of the buoyant force passes through the centre of gravity of the |
| A. | submerged body. |
| B. | displaced volume of the fluid. |
| C. | volume of fluid vertically above the body. |
| D. | horizontal projection of the body. |
| Answer» C. volume of fluid vertically above the body. | |
| 999. |
__________ pump is the most suitable device for discharging a liquid against a pressure of ‚â• 1500 kgf/cm2.$ |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 1000. |
In a fully turbulent flow (Re > 105) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is |
| A. | d |
| B. | d2 |
| C. | d2.5 |
| D. | d4 |
| Answer» D. d4 | |