MCQOPTIONS
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MCQOPTIONS
This section includes 659 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
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 | |
| 352. |
In the low Reynolds number region, the drag force on a sphere is proportional to_______________? |
| A. | V |
| B. | V2 |
| C. | V4 |
| D. | V0.5 |
| Answer» B. V2 | |
| 353. |
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as: (where, ‘δ’ is the boundary layer thickness and ‘x’ is the distance from the leading edge in the direction of flow)? |
| A. | Re |
| B. | √Re |
| C. | 1/Re |
| D. | Re-1/2 |
| Answer» E. | |
| 354. |
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. | |
| 355. |
In power law, δ = [A (du/dy)2 + B] then the fluid is__________________? |
| A. | Newtonian |
| B. | Dilatant |
| C. | Thixotropic |
| D. | Rheopectic |
| Answer» B. Dilatant | |
| 356. |
In parallel pipe problems, the__________________? |
| A. | Head loss is the same through each pipe |
| B. | Discharge is the same through all the pipes |
| C. | Total head loss is equal to the sum of the head losses through each pipe |
| D. | None of these |
| Answer» B. Discharge is the same through all the pipes | |
| 357. |
In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is_________________? |
| A. | 0.5 |
| B. | 0.84 |
| C. | 1.84 |
| D. | 1.25 |
| Answer» D. 1.25 | |
| 358. |
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 | |
| 359. |
In Newton’s law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is___________________? |
| A. | 0.44 |
| B. | 0.044 |
| C. | 4.4 |
| D. | 44 |
| Answer» B. 0.044 | |
| 360. |
In magnetic flow meters, voltage generation is________________? |
| A. | Due to the motion of conducting fluid through an externally generated uniform field |
| B. | Proportional to the fluid velocity |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 361. |
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 | |
| 362. |
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 | |
| 363. |
In hindered settling, the particles are_________________________? |
| A. | Placed farther from the wall |
| B. | Not affected by other particles and the wall |
| C. | Near each other |
| D. | None of these |
| Answer» D. None of these | |
| 364. |
In frictional fluid flow, the quantity, (P/ρ) + (V2/2gc) + gz/gc) is___________________? |
| A. | Constant along a streamline |
| B. | Not constant along a streamline |
| C. | Increased in the direction of flow |
| D. | None of these |
| Answer» C. Increased in the direction of flow | |
| 365. |
In fluid flow, the stagnation point is defined as a point, where the _____________ is zero? |
| A. | Flow velocity |
| B. | Pressure |
| C. | Total energy |
| D. | All A., B. and C. |
| Answer» B. Pressure | |
| 366. |
In fluid flow, the boundary layer separation cannot occur___________________? |
| A. | In case of boundaries experiencing form drag |
| B. | At points of abrupt changes in the flow directions |
| C. | In laminar flow |
| D. | None of these |
| Answer» E. | |
| 367. |
In fluid flow, cavitation is caused, if the____________________? |
| A. | Fluid velocity decreases to zero |
| B. | Total energy decreases |
| C. | Both A. and B. |
| D. | Flow pressure approaches its vapor pressure at the prevailing temperature |
| Answer» E. | |
| 368. |
In deriving Bernoulli’s equation, fluid is assumed to be________________? |
| A. | Incompressible, frictionless, steady, along a streamline |
| B. | Uniform, steady, incompressible, along a streamline |
| C. | Steady, density being pressure dependent, frictionless |
| D. | None of these |
| Answer» B. Uniform, steady, incompressible, along a streamline | |
| 369. |
In continuous fluidisation_________________? |
| A. | Solids are completely entrained |
| B. | The pressure drop is less than that for batch fluidisation |
| C. | There is no entrainment of solids |
| D. | Velocity of the fluid is very small |
| Answer» B. The pressure drop is less than that for batch fluidisation | |
| 370. |
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes_______________? |
| A. | Less than atmospheric pressure |
| B. | More than liquid vapor pressure |
| C. | Less than liquid vapor pressure |
| D. | More than atmospheric pressure |
| Answer» D. More than atmospheric pressure | |
| 371. |
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature? |
| A. | Lower than |
| B. | Higher than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 372. |
In case of turbulent flow of fluid through a circular pipe, the __________________? |
| A. | Mean flow velocity is about 0.5 times the maximum velocity |
| B. | Velocity profile becomes flatter and flatter with increasing Reynolds number |
| C. | Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius) |
| D. | Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more |
| Answer» E. | |
| 373. |
In case of Venturimeter, friction losses are about _____________ percent of maximum velocity head? |
| A. | 2 |
| B. | 8 |
| C. | 12 |
| D. | 20 |
| Answer» B. 8 | |
| 374. |
In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ? |
| A. | Discharge of water by a centrifugal pump being run at a constant rpm |
| B. | Water flow in the suction and discharge pipe of a reciprocating pump |
| C. | Water discharge from a vertical vessel in which constant level is maintained |
| D. | Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe |
| Answer» C. Water discharge from a vertical vessel in which constant level is maintained | |
| 375. |
In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)? |
| A. | Vavg |
| B. | 1.2 Vavg |
| C. | 1.5 Vavg |
| D. | 1.8 Vavg |
| Answer» C. 1.5 Vavg | |
| 376. |
In case of supersonic flow of a fluid through pipeline, the ‘Mach number’ is__________________? |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 377. |
In case of laminar flow of fluid through a circular pipe, the__________________? |
| A. | Shear stress over the cross-section is proportional to the distance from the surface of the pipe |
| B. | Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder |
| C. | Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection |
| D. | Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius) |
| Answer» C. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection | |
| 378. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) ? |
| A. | 1/√M |
| B. | √M |
| C. | 1/M |
| D. | M |
| Answer» B. √M | |
| 379. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature) ? |
| A. | 1/√T |
| B. | 1/T |
| C. | √T |
| D. | T |
| Answer» D. T | |
| 380. |
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________? |
| A. | Relative roughness |
| B. | Absolute roughness |
| C. | Friction co-efficient for flows at equal Reynold number |
| D. | All A., B. & C. |
| Answer» D. All A., B. & C. | |
| 381. |
In case of end to end connection of two or more pipes in series, the ______________ each pipe? |
| A. | Same rate of flow passes through |
| B. | Head loss is same through |
| C. | Rate of flow in each pipe is proportional to the length of |
| D. | Total flow rate is the sum of flow rate in |
| Answer» B. Head loss is same through | |
| 382. |
In case of Couette 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 | |
| 383. |
In case of centrifugal fan or blower, the gas capacity varies as __________________? |
| A. | Speed |
| B. | (Speed)2 |
| C. | (Speed)3 |
| D. | (Speed)0.5 |
| Answer» B. (Speed)2 | |
| 384. |
In case of a ____________ the energy of flow is considerably decreased downstream of the machine? |
| A. | Blower |
| B. | Turbine |
| C. | Centrifugal pump |
| D. | Centrifugal fan |
| Answer» C. Centrifugal pump | |
| 385. |
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 | |
| 386. |
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. | |
| 387. |
In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________? |
| A. | The velocity of sound |
| B. | Dependent on its cross-sectional area |
| C. | Dependent on fluid viscosity |
| D. | Dependent on fluid density |
| Answer» B. Dependent on its cross-sectional area | |
| 388. |
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. | |
| 389. |
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 | |
| 390. |
In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________? |
| A. | Pressure drop increases linearly |
| B. | Pressure drop is almost constant |
| C. | Area through which fluid flows does not vary |
| D. | None of these |
| Answer» C. Area through which fluid flows does not vary | |
| 391. |
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 | |
| 392. |
In an incompressible flow of fluid, the fluid ________________? |
| A. | Temperature remains constant |
| B. | Compressibility is greater than zero |
| C. | Density does not change with pressure & temperature |
| D. | Is frictionless |
| Answer» D. Is frictionless | |
| 393. |
In a/an _____________, the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | Venturimeter |
| D. | Flow nozzle |
| Answer» C. Venturimeter | |
| 394. |
In a stabilised soap bubble, pressure inside it compared to external pressure is________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Unpredictable |
| Answer» B. Less | |
| 395. |
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 | |
| 396. |
In a free vortex, the_____________________? |
| A. | Velocity changes linearly with radial distance |
| B. | Flow is necessarily rotational |
| C. | Radial component of velocity is same everywhere |
| D. | Stream lines are not circular |
| Answer» B. Flow is necessarily rotational | |
| 397. |
In a fluidised bed reactor___________________? |
| A. | Temperature gradients are very high |
| B. | Temperature is more or less uniform |
| C. | Hot spots are formed |
| D. | Segregation of the solids occurs |
| Answer» C. Hot spots are formed | |
| 398. |
In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________? |
| A. | V1.8 |
| B. | V-0.8 |
| C. | V |
| D. | V-1 |
| Answer» B. V-0.8 | |
| 399. |
If ‘x’ is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________? |
| A. | x |
| B. | x/2 |
| C. | x/3 |
| D. | 2x/3 |
| Answer» B. x/2 | |
| 400. |
If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________? |
| A. | Same in both the tubes |
| B. | Greater in 1 mm dia tube |
| C. | Greater in 0.5 mm dia tube |
| D. | Zero in both the tubes |
| Answer» D. Zero in both the tubes | |