MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4001. |
Check valves are used |
| A. | at high pressure. |
| B. | in bends. |
| C. | for controlling water flow. |
| D. | for unidirectional flow. |
| Answer» E. | |
| 4002. |
A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is |
| A. | rotational and incompressible |
| B. | rotational and compressible |
| C. | irrotational and compressible |
| D. | irrotational and incompressible |
| Answer» C. irrotational and compressible | |
| 4003. |
Check in a centrifugal pump is |
| A. | provided in the discharge line. |
| B. | generally a globe valve. |
| C. | provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4004. |
Drag force acting on a body does not depend upon the |
| A. | density of the fluid. |
| B. | density of the body. |
| C. | velocity of the body. |
| D. | projected area of the body. |
| Answer» C. velocity of the body. | |
| 4005. |
Centrifugal pump is normally classified on the basis of the |
| A. | rpm. |
| B. | type of casing. |
| C. | impeller blade angle. |
| D. | number of blades in impeller. |
| Answer» C. impeller blade angle. | |
| 4006. |
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'? |
| A. | At the centre |
| B. | At d/4 from the wall |
| C. | At the wall |
| D. | At d/8 from the wall |
| Answer» D. At d/8 from the wall | |
| 4007. |
Acceleration head in a reciprocating pump |
| A. | increases the work done during delivery stroke. |
| B. | decreases the work done during suction stroke. |
| C. | does not change the work requirement of the pump. |
| D. | increases the work done during suction stroke. |
| Answer» D. increases the work done during suction stroke. | |
| 4008. |
The ratio of inertial forces to elastic forces is called the __________ number. |
| A. | Reynolds |
| B. | Mach |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |
| 4009. |
The equivalent diameter for flow through a rectangular duct of width B and height H is |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-783-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-783-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-783-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-783-4.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/fluid-mechanics/60-783-4.png"> | |
| 4010. |
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. | |
| 4011. |
The temperature in isentropic flow |
| A. | does not depend on Mach number. |
| B. | depends on Mach number only. |
| C. | cannot drop and then increase again downstream. |
| D. | none of these. |
| Answer» C. cannot drop and then increase again downstream. | |
| 4012. |
The energy equation, (E = internal energy/mass), is applicable to |
| A. | perfect gases only. |
| B. | isothermal flow of gases. |
| C. | adiabatic unsteady flow of gases. |
| D. | all compressible fluids. |
| Answer» E. | |
| 4013. |
What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ? |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-623-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-623-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-623-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-623-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/44-623-3.png"> | |
| 4014. |
A differential pressure cell is used for |
| A. | measuring small pressure difference in gases. |
| B. | measuring small pressure difference in liquids. |
| C. | remote recording of pressure difference. |
| D. | measuring the difference of the impact & the static pressure. |
| Answer» D. measuring the difference of the impact & the static pressure. | |
| 4015. |
If more than two branches of pipes are to be connected at the same point, then use a/an |
| A. | elbow |
| B. | union |
| C. | tee |
| D. | none of these. |
| Answer» D. none of these. | |
| 4016. |
In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency. |
| A. | manometric |
| B. | mechanical |
| C. | volumetric |
| D. | overall |
| Answer» B. mechanical | |
| 4017. |
A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms. |
| A. | 17 |
| B. | 42 |
| C. | 84 |
| D. | 1.8 |
| Answer» B. 42 | |
| 4018. |
The centre of pressure is |
| A. | always below the centroid of the area. |
| B. | always above the centroid of the area. |
| C. | a point on the line of action of the resultant force. |
| D. | at the centroid of the submerged area. |
| Answer» D. at the centroid of the submerged area. | |
| 4019. |
The uniformity of a gas fluidised bed depends upon the __________ of the solid particles. |
| A. | size |
| B. | surface properties |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 4020. |
The ratio of wall drag to total drag in the Stoke's law range is |
| A. | 0.5 |
| B. | 1 |
| C. | 1/3 |
| D. | 2/3 |
| Answer» E. | |
| 4021. |
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 | |
| 4022. |
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 | |
| 4023. |
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a |
| A. | weir |
| B. | pitot tube |
| C. | Kennison nozzle |
| D. | V-notch |
| Answer» C. Kennison nozzle | |
| 4024. |
A centrifugal pump is called a turbine pump, if it is having a |
| A. | turbine type impeller. |
| B. | vaned diffusion casing. |
| C. | rotating vaned volute. |
| D. | none of these. |
| Answer» C. rotating vaned volute. | |
| 4025. |
The operating pressure drop range in a bag filter is about __________ mm water gauge. |
| A. | 50-150 |
| B. | 5-10 |
| C. | 500-1500 |
| D. | 1500-2500 |
| Answer» B. 5-10 | |
| 4026. |
In chemical process equipments, the conical bottom heads used, usually has an apex angle of |
| A. | 20 |
| B. | 40 |
| C. | 60 |
| D. | 80 |
| Answer» D. 80 | |
| 4027. |
Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop. |
| A. | 25 |
| B. | 50 |
| C. | 75 |
| D. | 150 |
| Answer» D. 150 | |
| 4028. |
Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is |
| A. | more |
| B. | same |
| C. | less |
| D. | twice |
| Answer» D. twice | |
| 4029. |
Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the |
| A. | ultimate stress to breaking stress. |
| B. | ultimate stress to working stress. |
| C. | working stress to ultimate stress. |
| D. | none of these. |
| Answer» C. working stress to ultimate stress. | |
| 4030. |
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing. |
| A. | 1-5 |
| B. | 20-40 |
| C. | 100-150 |
| D. | 1000-1500 |
| Answer» C. 100-150 | |
| 4031. |
In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon |
| A. | baffle spacing |
| B. | clearance |
| C. | pitch |
| D. | none of these |
| Answer» E. | |
| 4032. |
Two iron pipes of the same nominal diameter but different schedule numbers will have the same |
| A. | inside diameter |
| B. | outside diameter |
| C. | wall thickness |
| D. | none of these |
| Answer» B. outside diameter | |
| 4033. |
Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2. C. |
| A. | 1250 |
| B. | 2500 |
| C. | 7500 |
| D. | 15000 |
| Answer» D. 15000 | |
| 4034. |
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent. |
| A. | 5 |
| B. | 20 |
| C. | 35 |
| D. | 55 |
| Answer» C. 35 | |
| 4035. |
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure ? |
| A. | At the inner surface. |
| B. | At the mid thickness of the cylindrical wall. |
| C. | At the outer surface. |
| D. | None of these. |
| Answer» B. At the mid thickness of the cylindrical wall. | |
| 4036. |
It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than |
| A. | 0.99 |
| B. | 0.95 |
| C. | 0.80 |
| D. | 0.55 |
| Answer» D. 0.55 | |
| 4037. |
A rivetted joint does not fail by __________ of rivets. |
| A. | tearing |
| B. | shearing |
| C. | tearing of the plate across a row |
| D. | none of these |
| Answer» E. | |
| 4038. |
Mass velocity is independent of temperature & pressure, when the flow is |
| A. | unsteady through unchanged cross-section. |
| B. | steady through changing cross-section. |
| C. | steady and the cross-section is unchanged. |
| D. | unsteady and the cross-section is changed. |
| Answer» D. unsteady and the cross-section is changed. | |
| 4039. |
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer. |
| A. | U-tube water. |
| B. | U-tube mercury. |
| C. | inclined tube mercury. |
| D. | inclined tube water. |
| Answer» E. | |
| 4040. |
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively). |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | either (a) or (b); depends on other factors |
| Answer» B. decrease | |
| 4041. |
Two dimensional stream function |
| A. | relates velocity and pressure. |
| B. | is constant along a stream line. |
| C. | is constant along an equipotential surface. |
| D. | none of these. |
| Answer» C. is constant along an equipotential surface. | |
| 4042. |
Differential manometer measures the |
| A. | atmospheric pressure. |
| B. | sub-atmospheric pressure. |
| C. | pressure difference between two points. |
| D. | none of these. |
| Answer» D. none of these. | |
| 4043. |
In a stabilised soap bubble, pressure inside it compared to external pressure is |
| A. | more |
| B. | less |
| C. | same |
| D. | unpredictable |
| Answer» B. less | |
| 4044. |
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 | |
| 4045. |
Power required for mixing Newtonion fluids is a function of the |
| A. | speed of impeller, diameter of impeller & viscosity. |
| B. | density & viscosity of fluid only. |
| C. | density of fluid, viscosity of fluid & impeller dia only. |
| D. | none of these. |
| Answer» E. | |
| 4046. |
Multistage compressors are used in industry, because they |
| A. | reduce the cost of compressor. |
| B. | reduce the size requirement, |
| C. | resemble closely to isothermal compression. |
| D. | are easy to control. |
| Answer» D. are easy to control. | |
| 4047. |
The hydrodynamic and thermal boundary layers will merge, when |
| A. | Prandtl number is one. |
| B. | Schmidt number tends to infinity. |
| C. | Nusselt number tends to infinity. |
| D. | Archimedes number is greater than 10000. |
| Answer» B. Schmidt number tends to infinity. | |
| 4048. |
Potential flow is the flow of |
| A. | compressible fluids with shear. |
| B. | compressible fluids with no shear. |
| C. | incompressible fluids with shear. |
| D. | incompressible fluids with no shear. |
| Answer» E. | |
| 4049. |
The value of critical Reynolds number for pipe flow is |
| A. | 1300 |
| B. | 10,000 |
| C. | 100,s000 |
| D. | none of these. |
| Answer» B. 10,000 | |
| 4050. |
Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. |
| A. | elastic |
| B. | viscous |
| C. | gravity |
| D. | none of these |
| Answer» B. viscous | |