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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.
| 1001. |
The head developed by a centrifugal pump is largely determined by the |
| A. | power of the pump. |
| B. | nature of the liquid being pumped. |
| C. | angle of the vanes and the speed of the tip of the impeller. |
| D. | vapour pressure of the liquid. |
| Answer» D. vapour pressure of the liquid. | |
| 1002. |
The unit of dynamic viscosity in SI unit is |
| A. | kg/m . sec |
| B. | N/m2 |
| C. | m2 /sec. |
| D. | m/N. sec. |
| Answer» B. N/m2 | |
| 1003. |
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity. |
| A. | directly proportional to |
| B. | inversely proportional to |
| C. | inversely proportional to the square root of |
| D. | independent of |
| Answer» C. inversely proportional to the square root of | |
| 1004. |
A centrifugal pump loses prime after starting. The reason of this trouble may be |
| A. | incomplete priming. |
| B. | too high a suction lift. |
| C. | low available NPSH and air leaks in the suction pipe. |
| D. | all (a), (b), and (c). |
| Answer» E. | |
| 1005. |
In isotropic turbulence, the __________ are equal to each other. |
| A. | temporal velocity components |
| B. | mean square of velocity fluctuations in the three co-ordinate directions |
| C. | root mean square of velocity fluctuations in the three co-ordinate directions |
| D. | none of these |
| Answer» C. root mean square of velocity fluctuations in the three co-ordinate directions | |
| 1006. |
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is |
| A. | Q/2 |
| B. | Q/4 |
| C. | Q/8 |
| D. | Q/16 |
| Answer» E. | |
| 1007. |
Lower BWG means __________ of the tube. |
| A. | lower thickness |
| B. | lower cross-section |
| C. | outer diameter |
| D. | inner diameter |
| Answer» C. outer diameter | |
| 1008. |
Volume of liquid displaced by a floating body is equivalent to its |
| A. | own weight |
| B. | submerged weight |
| C. | own volume |
| D. | submerged volume |
| Answer» B. submerged weight | |
| 1009. |
The pipe wall thickness is minimum for a pipe of given nominal size having schedule number |
| A. | 160 |
| B. | 120 |
| C. | 80 |
| D. | 40 |
| Answer» E. | |
| 1010. |
Steady uniform flow is represented by flow through a/an |
| A. | long pipe at constant rate. |
| B. | long pipe at decreasing rate. |
| C. | expanding tube at constant rate. |
| D. | none of these. |
| Answer» B. long pipe at decreasing rate. | |
| 1011. |
Viscosity of water at 40°C lies in the range of$ |
| A. | 1 x 10-3 to 2 x 10-3 kg/m.s |
| B. | 0.5 x 10-3 to 1 x 10-3 kg/m.s |
| C. | 1 to 2 kg/m.s |
| D. | 0.5 to 1 kg/m.s |
| Answer» C. 1 to 2 kg/m.s | |
| 1012. |
Which of the following is used for very accurate measurement of flow of gas at low velocity ? |
| A. | Pitot tube |
| B. | Rotameter |
| C. | Segmental orificemeter |
| D. | Hot wire annemometer |
| Answer» E. | |
| 1013. |
Isotropic turbulence occurs |
| A. | where there is no velocity gradient. |
| B. | at higher temperatures. |
| C. | only in Newtonion fluids. |
| D. | none of these. |
| Answer» B. at higher temperatures. | |
| 1014. |
In the complete turbulence zone (in rough pipes), the |
| A. | rough and smooth pipes have the same friction factor. |
| B. | laminar film covers the roughness projections. |
| C. | friction factor depends upon NRe only. |
| D. | friction factor is independent of the relative roughness. |
| Answer» E. | |
| 1015. |
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$ |
| A. | 1 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 1016. |
N2Re/NFr is called the __________ number. |
| A. | Brinkman |
| B. | Galileo |
| C. | Archimedes |
| D. | Euler |
| Answer» C. Archimedes | |
| 1017. |
Potential flow is characterised by the |
| A. | irrotational and frictionless flow. |
| B. | irrotational and frictional flow. |
| C. | one in which dissipation of mechanical energy into heat occurs. |
| D. | formation of eddies within the stream. |
| Answer» B. irrotational and frictional flow. | |
| 1018. |
Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | data insufficient to predict pressure drop |
| Answer» B. decrease | |
| 1019. |
Fluid resistance to shear depends upon its |
| A. | rate of transfer of molecular momentum. |
| B. | cohesion. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1020. |
The continuity equation in ideal fluid flow states that |
| A. | net rate of inflow into any small volume must be zero. |
| B. | energy is not constant along a streamline. |
| C. | energy is constant along a streamline. |
| D. | there exists a velocity potential. |
| Answer» B. energy is not constant along a streamline. | |
| 1021. |
A Newtonion fluid is that |
| A. | which follows Newton's law of motion. |
| B. | which needs a minimum shear, before it starts deforming. |
| C. | for which shear & deformation are related as |
| D. | none of these. |
| Answer» D. none of these. | |
| 1022. |
The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe. |
| A. | hyperbola |
| B. | parabola |
| C. | semi-circle |
| D. | semi-ellipse |
| Answer» C. semi-circle | |
| 1023. |
Laminar flow is characterised by the nonexistence of |
| A. | pressure fluctuation. |
| B. | eddies. |
| C. | deviating velocities. |
| D. | all (a), (b)&(c). |
| Answer» E. | |
| 1024. |
In which of the following body shapes, the pressure drag is large compared to the friction drag ? |
| A. | Stream line body |
| B. | Two dimensional body |
| C. | Bluff body |
| D. | None of these |
| Answer» D. None of these | |
| 1025. |
The unit of velocity head is |
| A. | ft-lb/sec |
| B. | ft-lb/ft3 |
| C. | ft-lbf/lb |
| D. | ft-lbf/sec. |
| Answer» D. ft-lbf/sec. | |
| 1026. |
A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid. |
| A. | Newtonion |
| B. | viscous |
| C. | dilatant |
| D. | non-viscous |
| Answer» D. non-viscous | |
| 1027. |
Rubber latex is an example of __________ fluid. |
| A. | dilatent |
| B. | Newtonion |
| C. | pseudoplastic |
| D. | Bingham plastic |
| Answer» D. Bingham plastic | |
| 1028. |
Which is not a variable head meter ? |
| A. | Venturimeter |
| B. | Pitot tube |
| C. | Rotameter |
| D. | None of these |
| Answer» D. None of these | |
| 1029. |
Which of the following may be termed as a variable orifice flowmeter ? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | V-notch |
| D. | All (a), (b) and (c) |
| Answer» B. Pitot tube | |
| 1030. |
In case of a pipe exit fitted with a nozzle, the |
| A. | conversion of kinetic head to pressure head is facilitated. |
| B. | conversion of pressure head to kinetic head is facilitated. |
| C. | power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head. |
| D. | both (b) and (c) |
| Answer» E. | |
| 1031. |
A venturimeter can not be used for the direct measurement of |
| A. | datum difference in the stretch of pipeflow |
| B. | pressure difference in the flow throughpipeline. |
| C. | friction loss in pipe flow. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1032. |
Stoke's equation is valid in the Reynolds number range |
| A. | 0.01 to 0.1 |
| B. | 0.1 to 2 |
| C. | 2 to 10 |
| D. | 10 to 100 |
| Answer» B. 0.1 to 2 | |
| 1033. |
Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency)$ |
| A. | ηma x ηm x ηv = ηo |
| B. | ηm = ηv . ηma |
| C. | ηma = ηm x ηv |
| D. | ηv = ηm x ηma |
| Answer» C. Œ∑ma = Œ∑m x Œ∑v | |
| 1034. |
A venturimeter measures the |
| A. | velocity head |
| B. | pressure |
| C. | point velocity |
| D. | none of these |
| Answer» E. | |
| 1035. |
Steady non-uniform flow is exemplified by flow through a/an |
| A. | long pipe at constant rate. |
| B. | long pipe at decreasing rate. |
| C. | expanding tube at increasing rate. |
| D. | expanding tube at constant rate. |
| Answer» E. | |
| 1036. |
Delivery of insufficient quantity of liquid by a pump may be caused by |
| A. | air leak in the inlet |
| B. | low rpm |
| C. | too high a lift |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1037. |
Fluid flow at increasing rate through a diverging pipe is an example of __________ flow. |
| A. | steady uniform |
| B. | non-steady uniform |
| C. | steady non-uniform |
| D. | non-steady non-uniform |
| Answer» E. | |
| 1038. |
The Prandtl pitot tube measures the |
| A. | velocity at a point in the flow. |
| B. | pressure at a point. |
| C. | average flow velocity. |
| D. | pressure difference in pipe flow. |
| Answer» B. pressure at a point. | |
| 1039. |
Nature of fluid flow during the opening of a valve in a pipeline is |
| A. | laminar |
| B. | unsteady |
| C. | steady |
| D. | uniform |
| Answer» C. steady | |
| 1040. |
Disc compensators are provided in large diameter fuel gas carrying pipelines to |
| A. | keep the pipe in proper orientation. |
| B. | make the pipe joint leak-proof. |
| C. | account for contraction/expansion of pipe due to temperature changes of the surroundings. |
| D. | account for the pressure variation side the pipeline. |
| Answer» D. account for the pressure variation side the pipeline. | |
| 1041. |
For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to(where, μ = fluid viscosity )$ |
| A. | μ |
| B. | 1/μ |
| C. | μ |
| D. | 1/μ |
| Answer» C. Œº | |
| 1042. |
Dimension of kinematic viscosity is |
| A. | MLT-1 |
| B. | L2 . T-1 |
| C. | L2T |
| D. | L2 . T-2 |
| Answer» C. L2T | |
| 1043. |
A pitched-blade turbine draws __________ a straight blade turbine. |
| A. | less power than |
| B. | more power than |
| C. | same power as |
| D. | data insufficient to predict |
| Answer» B. more power than | |
| 1044. |
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | data insufficient to predict relative pressure drop. |
| Answer» C. remain unchanged | |
| 1045. |
The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and |
| A. | moving |
| B. | static |
| C. | cold |
| D. | hot |
| Answer» B. static | |
| 1046. |
Hydraulic radius of 6" x 12" cross-section, is __________ inches. |
| A. | 2 |
| B. | 0.5 |
| C. | 1.5 |
| D. | none of these |
| Answer» B. 0.5 | |
| 1047. |
In laminar flow through a round tube, the discharge varies |
| A. | linearly as the viscosity. |
| B. | inversely as the pressure drop. |
| C. | inversely as the viscosity. |
| D. | as the square of the radius. |
| Answer» D. as the square of the radius. | |
| 1048. |
Which of the following can be used to create a flow of gas, where no significant compression is required ? |
| A. | Reciprocating compressor |
| B. | Blower |
| C. | Axial flow compressor |
| D. | Centrifugal compressor |
| Answer» C. Axial flow compressor | |
| 1049. |
Centrifugal pumps as compared to reciprocating pumps |
| A. | run at a lower speed for the same discharge. |
| B. | do not need priming. |
| C. | deliver fluid with pulsating/fluctuating discharge. |
| D. | can be run with discharge line valve closed for a short interval. |
| Answer» E. | |
| 1050. |
The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by |
| A. | Cv . 2gH |
| B. | Cc . 2gH |
| C. | Cd . 2gH |
| D. | Cv . Va |
| Answer» B. Cc . 2gH | |