MCQOPTIONS
Saved Bookmarks
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.
| 1551. |
Pick out the correct statement pertaining to transition/ entrance length in fluid flow. |
| A. | The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length. |
| B. | Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe. |
| C. | Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1552. |
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 | |
| 1553. |
Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is |
| A. | 102π |
| B. | 5π/2 |
| C. | 52π |
| D. | 5π/2 |
| Answer» C. 52œÄ | |
| 1554. |
Pick out the Hagen-Poiseulle's equation. |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 1555. |
Vena-contracta formed during flow of a liquid through an orificemeter has |
| A. | minimum liquid cross-section. |
| B. | more diameter compared to orifice diameter. |
| C. | minimum velocity of fluid stream. |
| D. | none of these. |
| Answer» B. more diameter compared to orifice diameter. | |
| 1556. |
Choking in case of pipe flow means that a |
| A. | specified mass flow rate can not be achieved. |
| B. | valve is closed in the line. |
| C. | restriction in flow cross-section area occurs. |
| D. | none of these. |
| Answer» B. valve is closed in the line. | |
| 1557. |
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). |
| A. | Q = Q1 + Q2 + Q3 |
| B. | V1 = V2 = V3 |
| C. | Q1 = Q2 = Q3 |
| D. | f = f1 + f2 + f3 |
| Answer» B. V1 = V2 = V3 | |
| 1558. |
With increase in pump speed, its NPSH requirement |
| A. | decreases |
| B. | increases |
| C. | remains unaltered |
| D. | can either increase or decrease ; depends on other factors |
| Answer» C. remains unaltered | |
| 1559. |
When the pipe Reynold's number is 6000, the flow is generally |
| A. | viscous |
| B. | laminar |
| C. | turbulent |
| D. | transition |
| Answer» D. transition | |
| 1560. |
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. | |
| 1561. |
If in a flow field, between any two points, then the flow must be |
| A. | steady, incompressible, irrotational. |
| B. | steady, compressible, irrotational. |
| C. | steady, compressible and along a streamline. |
| D. | unsteady, incompressible, irrotational. |
| Answer» B. steady, compressible, irrotational. | |
| 1562. |
Water hammer in a pipeline results from the |
| A. | bursting of pipelines due to closure by a valve. |
| B. | rapid pressure change due to a rapid change in the rate of flow. |
| C. | pressure increase due to closure of a valve resulting in decrease in rate of flow. |
| D. | none of these. |
| Answer» C. pressure increase due to closure of a valve resulting in decrease in rate of flow. | |
| 1563. |
Molten soap mass is transported by a __________ pump. |
| A. | diaphragm |
| B. | reciprocating |
| C. | gear |
| D. | centrifugal |
| Answer» E. | |
| 1564. |
The pump used for irrigation purposes is generally designed for |
| A. | large capacity & high head. |
| B. | large capacity & low head. |
| C. | small capacity & high head. |
| D. | small capacity & low head. |
| Answer» C. small capacity & high head. | |
| 1565. |
For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship. |
| A. | logarithmic |
| B. | linear |
| C. | hyperbolic |
| D. | parabolic |
| Answer» B. linear | |
| 1566. |
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the new discharge will be __________ litres/minute. |
| A. | 500 |
| B. | 200 |
| C. | 1000 |
| D. | 750 |
| Answer» B. 200 | |
| 1567. |
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 | |
| 1568. |
Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ? |
| A. | Head & discharge |
| B. | Length & discharge |
| C. | Length & diameter |
| D. | Friction factor & diameter. |
| Answer» B. Length & discharge | |
| 1569. |
A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is |
| A. | 25.61 kPa |
| B. | 11.77 kPa |
| C. | 14.86 kPa |
| D. | 21.13 kPa |
| Answer» C. 14.86 kPa | |
| 1570. |
For the transfer of solution of thick slurry, the pump used is a __________ pump. |
| A. | reciprocating |
| B. | gear |
| C. | diaphragm |
| D. | centrifugal |
| Answer» D. centrifugal | |
| 1571. |
The velocity profile for turbulent flow through a closed conduit is |
| A. | logarithmic |
| B. | parabolic |
| C. | hyperbolic |
| D. | linear |
| Answer» B. parabolic | |
| 1572. |
The terminal velocity of a small sphere settling in a viscous fluid varies as the |
| A. | first power of its dimeter. |
| B. | inverse of the fluid viscosity. |
| C. | inverse square of the diameter. |
| D. | square of the difference in specific weights of solid & fluid. |
| Answer» C. inverse square of the diameter. | |
| 1573. |
For an unstable equilibrium of a floating body (where, M = metacentre.) |
| A. | M is above G |
| B. | M is below G |
| C. | M & G coincide |
| D. | none of these |
| Answer» C. M & G coincide | |
| 1574. |
A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is |
| A. | 10 KPa |
| B. | 20 KPa |
| C. | 30 KPa |
| D. | 40 KPa |
| Answer» C. 30 KPa | |
| 1575. |
__________ pumps are a group of vacuum pumps. |
| A. | Hyter |
| B. | Sump |
| C. | Mono |
| D. | Submerged |
| Answer» B. Sump | |
| 1576. |
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is |
| A. | < 1 |
| B. | 1 |
| C. | > 1 |
| D. | 2 |
| Answer» B. 1 | |
| 1577. |
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will |
| A. | decrease |
| B. | increase |
| C. | remain same |
| D. | unpredictable |
| Answer» B. increase | |
| 1578. |
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of |
| A. | 2 |
| B. | <2 |
| C. | >2 |
| D. | 43497 |
| Answer» B. <2 | |
| 1579. |
Remote control valve is a __________ valve. |
| A. | gate |
| B. | butterfly |
| C. | needle |
| D. | globe |
| Answer» C. needle | |
| 1580. |
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. | |
| 1581. |
Which of the following fluid forces are not considered in the Navier-Stoke's equation? |
| A. | Gravity forces |
| B. | Viscous forces |
| C. | Pressure forces |
| D. | Turbulent forces |
| Answer» E. | |
| 1582. |
A globe valve is the most suitable for applications, in which |
| A. | fluid flow control is required. |
| B. | fluid contains dispersed solid particles. |
| C. | valve is required to be either fully open or fully closed. |
| D. | one way flow is required. |
| Answer» B. fluid contains dispersed solid particles. | |
| 1583. |
Pascal law is not applicable for a/an __________ fluid. |
| A. | accelerating frictionless |
| B. | static |
| C. | uniformly moving |
| D. | none of these |
| Answer» E. | |
| 1584. |
Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum |
| A. | flow rate |
| B. | mean velocity |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» C. both 'a' & 'b' | |
| 1585. |
A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity |
| A. | same as that of A. |
| B. | one fourth as that of A. |
| C. | twice as that of A. |
| D. | four times as that of A. |
| Answer» C. twice as that of A. | |
| 1586. |
__________ is an example of axial flow impeller. |
| A. | Paddle |
| B. | Turbine |
| C. | Propeller |
| D. | all (a), (b) and(c) |
| Answer» D. all (a), (b) and(c) | |
| 1587. |
The distance between metacentre and __________ is called metacentric height. |
| A. | water surface |
| B. | centre of gravity |
| C. | centre of buoyancy |
| D. | none of these |
| Answer» C. centre of buoyancy | |
| 1588. |
The normal stress is the same in all directions at a point in a fluid, when the fluid is |
| A. | non-viscous. |
| B. | incompressible. |
| C. | both (a) and (b). |
| D. | having no motion of one fluid layer relative to the other. |
| Answer» E. | |
| 1589. |
When the momentum of one fluid is used for moving another fluid, such a device is called a/an |
| A. | jet pump |
| B. | blower |
| C. | acid egg |
| D. | none of these |
| Answer» B. blower | |
| 1590. |
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the |
| A. | inverse of fluid viscosity. |
| B. | square of particle size. |
| C. | difference in the densities of the particle & fluid. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1591. |
One poise (unit of absolute/dynamic viscosity) is equivalent to one |
| A. | gm/cm2. sec. |
| B. | gm/cm. sec. |
| C. | cm2/sec. |
| D. | m2/sec. |
| Answer» C. cm2/sec. | |
| 1592. |
At high Reynolds number |
| A. | inertial forces control and viscous forces are unimportant. |
| B. | viscous forces predominate. |
| C. | inertial forces are unimportant and viscous forces control. |
| D. | none of these. |
| Answer» B. viscous forces predominate. | |
| 1593. |
The continuity equation of fluid mechanics utilises the principle of conservation of |
| A. | momentum |
| B. | mass |
| C. | energy |
| D. | both (b) & (c) |
| Answer» C. energy | |
| 1594. |
Forces acting on a particle settling in fluid are __________ forces. |
| A. | gravitational & buoyant. |
| B. | centrifugal & drag. |
| C. | gravitational or centrifugal buoyant drag. |
| D. | external, drag & viscous. |
| Answer» D. external, drag & viscous. | |
| 1595. |
Which of the following denotes the effect of compressibility in fluid flow ? |
| A. | Weber number |
| B. | Mach number |
| C. | Euler number |
| D. | Reynolds number |
| Answer» C. Euler number | |
| 1596. |
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 0.33 |
| Answer» D. 0.33 | |
| 1597. |
Head developed by a centrifugal pump depends on its |
| A. | speed |
| B. | impeller diameter |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1598. |
Co-efficient of velocity is __________ the coefficient of discharge. |
| A. | less than |
| B. | more than |
| C. | equal to |
| D. | not related to |
| Answer» C. equal to | |
| 1599. |
The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is |
| A. | 0.1 |
| B. | 0.55 |
| C. | 0.95 |
| D. | 1.85 |
| Answer» D. 1.85 | |
| 1600. |
For a particle settling in water at its terminal settling velocity, which of the following is true ? |
| A. | Buoyancy = weight + drag |
| B. | Weight = buoyancy + drag |
| C. | Drag = buoyancy + weight |
| D. | Drag = weight |
| Answer» C. Drag = buoyancy + weight | |