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.
| 1201. |
The valve commonly used in pipes larger than 2" dia is a |
| A. | globe valve |
| B. | plug-cock |
| C. | gate valve |
| D. | check valve |
| Answer» D. check valve | |
| 1202. |
Which of the following flow measuring devices is an area meter ? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Anemometer |
| D. | Rotameter |
| Answer» E. | |
| 1203. |
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance). |
| A. | V/Vmax = (x/r)1/7 |
| B. | V/Vmax = (r/x)1/7 |
| C. | V/Vmax = (x.r)1/7 |
| D. | none of these |
| Answer» B. V/Vmax = (r/x)1/7 | |
| 1204. |
Net positive suction head (NPSH) of a centrifugal pump must be |
| A. | greater than the vapour pressure of the liquid. |
| B. | less than the vapour pressure of the liquid. |
| C. | equal to the vapour pressure of the liquid. |
| D. | less than barometric pressure. |
| Answer» B. less than the vapour pressure of the liquid. | |
| 1205. |
Reynolds number is the ratio of |
| A. | viscous forces to gravity forces. |
| B. | inertial forces to viscous forces. |
| C. | viscous forces to inertial forces. |
| D. | inertial forces to gravity forces. |
| Answer» C. viscous forces to inertial forces. | |
| 1206. |
The dimension of kinematic viscosity is |
| A. | ML-2T-1 |
| B. | L2T-1 |
| C. | ML-2T-2 |
| D. | none of these |
| Answer» C. ML-2T-2 | |
| 1207. |
Piezometric head is the sum of the __________ heads. |
| A. | elevation & kinetic energy |
| B. | elevation & pressure |
| C. | kinetic energy & pressure |
| D. | none of these |
| Answer» C. kinetic energy & pressure | |
| 1208. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is |
| A. | 4.4 KPa |
| B. | 2.94 KPa |
| C. | 3.7 KPa |
| D. | none of these |
| Answer» B. 2.94 KPa | |
| 1209. |
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. | |
| 1210. |
A piezometer opening measures the __________ fluid pressure. |
| A. | static |
| B. | undisturbed |
| C. | total |
| D. | dynamic |
| Answer» C. total | |
| 1211. |
For pipes that must be broken at intervals for maintenance, the connector used should be a/an |
| A. | union |
| B. | tee |
| C. | reducer |
| D. | elbow |
| Answer» B. tee | |
| 1212. |
The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is.....the mean velocity of flow. |
| A. | directly proportional to |
| B. | directly proportional to square of |
| C. | inversely proportional to |
| D. | inversely proportional to square of |
| Answer» C. inversely proportional to | |
| 1213. |
It is possible to integrate an automatic flow controller to a |
| A. | flow nozzle |
| B. | venturimeter |
| C. | rotameter |
| D. | none of these |
| Answer» D. none of these | |
| 1214. |
Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump. |
| A. | reciprocating |
| B. | plunger |
| C. | electromagnetic |
| D. | gear |
| Answer» D. gear | |
| 1215. |
A pressure of 10 m head of water is equivalent to __________ kN/m2. |
| A. | 98 |
| B. | 147 |
| C. | 196 |
| D. | 49 |
| Answer» B. 147 | |
| 1216. |
The discharge co-efficient for an orificemeter does not depend upon the |
| A. | pipe length. |
| B. | ratio of pipe diameter to orifice diameter. |
| C. | type of orifice & the Reynolds number. |
| D. | pipe diameter. |
| Answer» B. ratio of pipe diameter to orifice diameter. | |
| 1217. |
A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).$ |
| A. | less head & capacity |
| B. | more head |
| C. | more capacity |
| D. | less head & more capacity |
| Answer» B. more head | |
| 1218. |
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics. |
| A. | piston |
| B. | gear |
| C. | positive displacement |
| D. | sump |
| Answer» C. positive displacement | |
| 1219. |
Which of the fluid forces are not considered in the Reynold's equation of flow ? |
| A. | Viscous forces |
| B. | Turbulent forces |
| C. | Pressure forces |
| D. | Compressibility forces |
| Answer» E. | |
| 1220. |
__________ flow means the flow of incompressible fluid with no shear. |
| A. | Potential |
| B. | Streamline |
| C. | Creep |
| D. | Boundary layer |
| Answer» B. Streamline | |
| 1221. |
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. | |
| 1222. |
Minimum porosity for fluidisation is |
| A. | that corresponding to static bed. |
| B. | that corresponding to completely fluidised bed. |
| C. | the porosity of the bed when true fluidisation begins. |
| D. | less than that of the' static bed. |
| Answer» D. less than that of the' static bed. | |
| 1223. |
The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density. |
| A. | directly as |
| B. | inversely as square root of |
| C. | inversely as |
| D. | as square of |
| Answer» B. inversely as square root of | |
| 1224. |
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller. |
| A. | speed of |
| B. | diameter of |
| C. | fluid velocity leaving |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1225. |
For flow of fluids through packed bed, the superficial velocity is |
| A. | less than the average velocity through channels. |
| B. | more than the average velocity through channels. |
| C. | dependent on the pressure drop across the bed. |
| D. | same as the average velocity through channels. |
| Answer» B. more than the average velocity through channels. | |
| 1226. |
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure. |
| A. | increase |
| B. | decrease |
| C. | not change |
| D. | exponentially decrease |
| Answer» B. decrease | |
| 1227. |
Centre of pressure in an immersed body is __________ the centre of gravity. |
| A. | above |
| B. | below |
| C. | at |
| D. | either above or below; depends on the liquid density |
| Answer» C. at | |
| 1228. |
Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid |
| A. | lies above the centroid of the plane surface. |
| B. | is independent of the specific weight of the fluid. |
| C. | is different for different fluids. |
| D. | is at the centroid of the plane surface. |
| Answer» C. is different for different fluids. | |
| 1229. |
Foot valve provided in the pump is a __________ valve. |
| A. | direction control |
| B. | back pressure |
| C. | relief |
| D. | pressure reduction |
| Answer» C. relief | |
| 1230. |
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 | |
| 1231. |
A gas |
| A. | signifies absence of density. |
| B. | can resist shearing action. |
| C. | is incompressible. |
| D. | is a supercritical vapor. |
| Answer» E. | |
| 1232. |
Fanning friction factor for laminar flow of fluid in a circular pipe is |
| A. | not a function of the roughness of pipe wall. |
| B. | inversely proportional to Reynolds number. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1233. |
For laminar flow through a closed conduit |
| A. | Vmax = 2Vav |
| B. | Vmax = Vav |
| C. | Vmax = 1.5Vav |
| D. | Vmax = 0.5Vav |
| Answer» B. Vmax = Vav | |
| 1234. |
Volute of a centrifugal pump should be designed in a fashion, such that the |
| A. | kinetic head gets converted into static head. |
| B. | moving stream gradually reduces velocity. |
| C. | mean velocity remains constant. |
| D. | none of these. |
| Answer» B. moving stream gradually reduces velocity. | |
| 1235. |
The losses in open channel flow generally vary as the |
| A. | inverse of the roughness. |
| B. | first power of the roughness. |
| C. | square of the velocity. |
| D. | inverse square of hydraulic radius. |
| Answer» C. square of the velocity. | |
| 1236. |
Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficientCc = co-efficient of contractionCv = co-efficient of velocity) |
| A. | Cd = Cc/Cv |
| B. | Cd = Cc.Cv |
| C. | Cd = Cv/cc |
| D. | none of these |
| Answer» C. Cd = Cv/cc | |
| 1237. |
The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid. |
| A. | Newtonion |
| B. | dilatant |
| C. | pseudoplastic |
| D. | non-Newtonion |
| Answer» B. dilatant | |
| 1238. |
In an incompressible fluid, the density is |
| A. | greatly affected by moderate changes in pressure. |
| B. | greatly affected only by moderate changes in temperature. |
| C. | not affected with moderate change in temperature & pressure. |
| D. | sensible to changes in both temperature & pressure. |
| Answer» D. sensible to changes in both temperature & pressure. | |
| 1239. |
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed. |
| A. | spouted |
| B. | sluggish |
| C. | boiling |
| D. | teeter |
| Answer» B. sluggish | |
| 1240. |
What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» B. 1 | |
| 1241. |
Buoyant force |
| A. | for non-symmetrical bodies is not vertical. |
| B. | depends on the depth of the submergence of the floating body. |
| C. | depends on the weight of the floating body. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1242. |
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent.D. Fluid is compressible.E. Fluid is incompressible. |
| A. | A, C, D |
| B. | B, D, E |
| C. | A, B, E |
| D. | A, D, E |
| Answer» D. A, D, E | |
| 1243. |
Gradually varied flow in open channel is a/an __________ flow. |
| A. | steady uniform |
| B. | steady non-uniform |
| C. | unsteady uniform |
| D. | unsteady non-uniform |
| Answer» C. unsteady uniform | |
| 1244. |
Purpose of air lift pump is to |
| A. | compress air. |
| B. | lift compressed air. |
| C. | lift water from a well by using compressed air. |
| D. | lift air under negative pressure. |
| Answer» D. lift air under negative pressure. | |
| 1245. |
At a constant speed of the centrifugal pump . it __________ the impeller diameter. |
| A. | capacity varies directly with |
| B. | head varies as the square of |
| C. | horsepower varies as the cube of |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1246. |
Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head. |
| A. | elevation |
| B. | pressure |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 1247. |
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of |
| A. | powder & grannular solids |
| B. | liquids |
| C. | low melting point semi-solids |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 1248. |
Air vessel fitted to a reciprocating pump |
| A. | increases the work done. |
| B. | decreases the work done. |
| C. | causes cavitation. |
| D. | results in non-uniform discharge. |
| Answer» C. causes cavitation. | |
| 1249. |
In case of coutte flow, the fluid flow is between two large flat parallel plates with |
| A. | top plate moving and the bottom plate fixed. |
| B. | bottom plate moving and the top plate fixed. |
| C. | both the plates fixed. |
| D. | both the plates moving. |
| Answer» B. bottom plate moving and the top plate fixed. | |
| 1250. |
Momentum correction factor used in fluid flow problems accounts for the |
| A. | change in direction of flow. |
| B. | change in total energy. |
| C. | change in pressure. |
| D. | non uniform direction of velocities at inlet & outlet sections. |
| Answer» E. | |