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.
| 1301. |
Turbulent flow generally occurs for cases involving |
| A. | highly viscous fluid |
| B. | very narrow passages |
| C. | very slow motion |
| D. | none of these |
| Answer» E. | |
| 1302. |
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary |
| A. | directly as square of gas density. |
| B. | directly as gas density. |
| C. | directly as square root of gas density. |
| D. | inversely as gas density. |
| Answer» C. directly as square root of gas density. | |
| 1303. |
Slurries can be most conveniently pumped by a __________ pump. |
| A. | screw |
| B. | reciprocating |
| C. | gear |
| D. | centrifugal |
| Answer» E. | |
| 1304. |
Bernoull's equation does not apply to the functioning of a/an |
| A. | venturimeter |
| B. | orificem |
| C. | pitot tube |
| D. | none of these |
| Answer» E. | |
| 1305. |
Drag co-efficient in hindered settling is __________ that in free settling. |
| A. | less than |
| B. | equal to |
| C. | not necessarily greater than |
| D. | always greater than |
| Answer» E. | |
| 1306. |
The ratio of actual discharge to theoretical discharge through an orifice is equal to |
| A. | Cc . Cv |
| B. | Cc . Cd |
| C. | Cv . Cd |
| D. | Cd/Cv |
| Answer» B. Cc . Cd | |
| 1307. |
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is |
| A. | more |
| B. | less |
| C. | equal |
| D. | either (a) or (b); depends on the viscosity of the fluid |
| Answer» B. less | |
| 1308. |
Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the |
| A. | drag on particles |
| B. | drag on coloumn walls |
| C. | bed height |
| D. | bed voidage |
| Answer» D. bed voidage | |
| 1309. |
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 1310. |
Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density. |
| A. | shear stress |
| B. | shear force |
| C. | average drag per unit projected area |
| D. | none of these |
| Answer» D. none of these | |
| 1311. |
The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is |
| A. | parabolic |
| B. | flat |
| C. | flat near the wall and parabolic in the middle |
| D. | parabolic near the wall and flat in the middle. |
| Answer» E. | |
| 1312. |
Friction produced by the formation of wakes is called the __________ friction. |
| A. | disk |
| B. | skin |
| C. | form |
| D. | none of these |
| Answer» D. none of these | |
| 1313. |
The range of a particular rotameter can be increased by |
| A. | use of floats of different densities. |
| B. | no means. |
| C. | increasing the diameter of the float. |
| D. | decreasing the diameter of the float. |
| Answer» B. no means. | |
| 1314. |
For steady ideal fluid flow, the Bernoulli's equation states that the |
| A. | velocity is constant along a stream line. |
| B. | energy is constant throughout the fluid |
| C. | energy is constant along a stream line, but may vary across stream lines |
| D. | none of these |
| Answer» D. none of these | |
| 1315. |
Baffles in mixing tanks are provided to |
| A. | reduce swirling and vortex formation. |
| B. | increase the structural strength of the tank. |
| C. | aid in rotational flow. |
| D. | none of these |
| Answer» B. increase the structural strength of the tank. | |
| 1316. |
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 | |
| 1317. |
With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field) |
| A. | decreases. |
| B. | increases linearly. |
| C. | increases exponentially. |
| D. | remains constant. |
| Answer» C. increases exponentially. | |
| 1318. |
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. | |
| 1319. |
A tube is specified by its |
| A. | thickness only |
| B. | outer diameter only |
| C. | thickness & outer diameter both |
| D. | inner diameter |
| Answer» D. inner diameter | |
| 1320. |
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ?$ |
| A. | 0.61 - 0.63 |
| B. | 0.5 - 0.75 |
| C. | 0.75 - 0.90 |
| D. | 0.35 - 0.55 |
| Answer» B. 0.5 - 0.75 | |
| 1321. |
In case of a rotameter, the density of the float material is __________ that of the liquid it replaces. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | either (a) or (b) |
| Answer» B. less than | |
| 1322. |
A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is |
| A. | 26 |
| B. | 42 |
| C. | 269 |
| D. | 325 |
| Answer» D. 325 | |
| 1323. |
The discharge through a semi-circular weir varies as (where, H = Head of liquid.) |
| A. | H |
| B. | H2 |
| C. | H3/2 |
| D. | H1/2 |
| Answer» C. H3/2 | |
| 1324. |
Transition from laminar flow to turbulent flow is aided by the |
| A. | surface roughness and curvature (i.e.sharp corners). |
| B. | vibration. |
| C. | pressure gradient and the compressibility of the flowing medium. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1325. |
While starting a centrifugal pump, its delivery valve should be kept |
| A. | opened. |
| B. | closed. |
| C. | either opened or closed ; it does not make any difference. |
| D. | either opened or closed; depending on the fluid viscosity. |
| Answer» C. either opened or closed ; it does not make any difference. | |
| 1326. |
The main factor on which the behaviour of a mass of fluidised solid depends mainly is the |
| A. | fluid characteristics |
| B. | particle size |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1327. |
Fanning friction factor is equal to(where, fB = Blassius friction factor). |
| A. | fB/4 |
| B. | fB/2 |
| C. | 4fB |
| D. | 2fB |
| Answer» B. fB/2 | |
| 1328. |
Slugging in a fluidised bed can be avoided by using |
| A. | tall narrow vessel. |
| B. | deep bed of solids. |
| C. | shallow beds of solids and proper choice of particle size. |
| D. | very large particles. |
| Answer» D. very large particles. | |
| 1329. |
Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) |
| A. | D = 1840 H0.5/N |
| B. | D = 1840 N/H0.5 |
| C. | H = 1840 D0.5/N |
| D. | D = 1840 H/N |
| Answer» B. D = 1840 N/H0.5 | |
| 1330. |
Power requirement of fans having constant wheel diameter varies __________ fan speed. |
| A. | as square of |
| B. | directly as |
| C. | as cube of |
| D. | none of these |
| Answer» D. none of these | |
| 1331. |
Two liquids manometer is used for measuring small pressure differences in |
| A. | liquids |
| B. | gases |
| C. | mixture of hydrocarbons |
| D. | none of these |
| Answer» C. mixture of hydrocarbons | |
| 1332. |
Dean number is concerned with the |
| A. | fluid-particle interaction. |
| B. | fluid flow through helical pipes. |
| C. | power consumption in agitated vessels. |
| D. | psychrometry. |
| Answer» C. power consumption in agitated vessels. | |
| 1333. |
Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively |
| A. | efficiency, head and B.H.P. |
| B. | head, efficiency and B.H.P. |
| C. | B.H.P., efficiency and head |
| D. | efficiency, B.H.P. and head |
| Answer» C. B.H.P., efficiency and head | |
| 1334. |
Function of air vessel provided in a reciprocating pump is to |
| A. | reduce discharge fluctuation. |
| B. | reduce the danger of cavitation. |
| C. | avoid the necessity of priming. |
| D. | increase the pump efficiency. |
| Answer» B. reduce the danger of cavitation. | |
| 1335. |
The capillary rise of mercury is maximum in glass tube of dia __________ mm. |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 5 |
| Answer» B. 1 | |
| 1336. |
Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have |
| A. | very low speeds. |
| B. | smaller discharge. |
| C. | higher capital &maintenance cost. |
| D. | high vibrations. |
| Answer» D. high vibrations. | |
| 1337. |
The lift of a ballon is |
| A. | increased, as it rises to a higher altitude. |
| B. | due to the weight of the atmospheric air, that it displaces. |
| C. | not dependent on the temperature of the atmosphere. |
| D. | none of these. |
| Answer» C. not dependent on the temperature of the atmosphere. | |
| 1338. |
Which of the following has the maximum compression ratio ? |
| A. | Blower |
| B. | Compressor |
| C. | Vacuum pump |
| D. | Fan |
| Answer» D. Fan | |
| 1339. |
With increase in the shear rate, the apparent viscosity of pseudoplastic fluids |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | may increase or decrease; depends on the magnitude of shear rate |
| Answer» C. remains same | |
| 1340. |
Paper pulp is an example of __________ fluid. |
| A. | dilatant |
| B. | bingham plastic |
| C. | Newtonion |
| D. | pseudoplastic |
| Answer» C. Newtonion | |
| 1341. |
A stream line is |
| A. | fixed in space in steady flow. |
| B. | always the path of particle. |
| C. | drawn normal to the velocity vector at every point. |
| D. | a line connecting the mid points of flow cross-section. |
| Answer» B. always the path of particle. | |
| 1342. |
A floating/submerged body is always stable, if its centre of gravity |
| A. | lies above its centre of buoyancy. |
| B. | and centre of buoyancy coincide. |
| C. | lies below its centre of buoyancy. |
| D. | lies above its meta centre. |
| Answer» D. lies above its meta centre. | |
| 1343. |
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 | |
| 1344. |
The co-efficient of drag and lift for an incompressible fluid depends on the |
| A. | Reynolds number |
| B. | Froude number |
| C. | Mach number |
| D. | all (a), (b) and (c) |
| Answer» B. Froude number | |
| 1345. |
Which of the following factors does not contribute to the pressure drop in a pipeline ? |
| A. | Velocity of fluid |
| B. | Size of pipe |
| C. | Length of pipe and number of bends |
| D. | None of these |
| Answer» E. | |
| 1346. |
A streamline is |
| A. | the line connecting the mid-points of flow cross-sections. |
| B. | defined for uniform flow only. |
| C. | drawn normal to the velocity vector at every point. |
| D. | always the path of a particle. |
| Answer» D. always the path of a particle. | |
| 1347. |
A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is __________ kg. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
| Answer» C. 1000 | |
| 1348. |
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised. |
| A. | bearing losses |
| B. | disk friction |
| C. | shock losses |
| D. | cavitation |
| Answer» D. cavitation | |
| 1349. |
Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd' |
| A. | d |
| B. | 0.5 d |
| C. | 2d |
| D. | 4d |
| Answer» C. 2d | |
| 1350. |
Pressure co-efficient is the ratio of pressure forces to __________ forces. |
| A. | gravity |
| B. | inertial |
| C. | viscous |
| D. | none of these |
| Answer» C. viscous | |