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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.
| 2651. |
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. | |
| 2652. |
Drag co-officient CD, in Stoke's law range is given by |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/4-52-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/4-52-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/4-52-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/4-52-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/4-52-3.png"> | |
| 2653. |
For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is |
| A. | more |
| B. | less |
| C. | equal |
| D. | independent of porosity |
| Answer» C. equal | |
| 2654. |
For a reciprocating pump, the indicator diagram is the graph between the |
| A. | discharge and overall efficiency. |
| B. | volume swept by piston for one complete revolution and the pressure in the cylinder. |
| C. | angle swept by the crank pin at any instant and the discharge. |
| D. | none of these. |
| Answer» C. angle swept by the crank pin at any instant and the discharge. | |
| 2655. |
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the |
| A. | barometric pressure |
| B. | speed of the impeller |
| C. | diameter of the impeller |
| D. | both (b) and (c) |
| Answer» B. speed of the impeller | |
| 2656. |
High specific speed of a pump implies that, it is a/an __________ pump. |
| A. | centrifugal |
| B. | mixed flow |
| C. | axial flow |
| D. | none of these |
| Answer» D. none of these | |
| 2657. |
A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be |
| A. | 8400 Pa/m |
| B. | 12600 Pa/m |
| C. | 18900 Pa/m |
| D. | 16800 Pa/m |
| Answer» C. 18900 Pa/m | |
| 2658. |
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 | |
| 2659. |
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ? |
| A. | Decrease in effect |
| B. | Increase in thrust |
| C. | Develops noise |
| D. | Develops high pressure |
| Answer» E. | |
| 2660. |
Velocity at a certain point in case of streamline flow is |
| A. | constant |
| B. | independent of time |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2661. |
Sewage sludge is an example of the __________ fluid. |
| A. | Bingham plastic |
| B. | Newtonion |
| C. | pseudoplastic |
| D. | dilatent |
| Answer» B. Newtonion | |
| 2662. |
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 | |
| 2663. |
Multistage centrifugal pumps are generally used for |
| A. | high head. |
| B. | low head but high discharge. |
| C. | highly viscous liquid. |
| D. | slurries of high solid concentration. |
| Answer» B. low head but high discharge. | |
| 2664. |
The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is |
| A. | 1.3 |
| B. | 0.766 |
| C. | 0.87 |
| D. | none of these |
| Answer» C. 0.87 | |
| 2665. |
Pick out the wrong statement pertaining to fluid flow. |
| A. | The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5. |
| B. | The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe. |
| C. | Navier-Stokes equation is applicable to the analysis of viscous flows. |
| D. | Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids. |
| Answer» B. The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe. | |
| 2666. |
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. | |
| 2667. |
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to |
| A. | <span class="root">x</span> |
| B. | 1/ |
| C. | <span class="root">x </span> |
| D. | x |
| E. | 1/x |
| Answer» B. 1/ | |
| 2668. |
Location of vena-contracta in an orificemeter does not depend upon the |
| A. | type of orifice. |
| B. | density, viscosity & compressibility of the fluid. |
| C. | ratio of pipe diameter to orifice diameter. |
| D. | pipe roughness. |
| Answer» B. density, viscosity & compressibility of the fluid. | |
| 2669. |
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 | |
| 2670. |
Unsteady uniform flow is represented by flow through a/an |
| A. | long pipe at constant rate. |
| B. | long pipe at decreasing rate. |
| C. | expanding tube at increasing rate. |
| D. | expanding tube at constant rate. |
| Answer» C. expanding tube at increasing rate. | |
| 2671. |
When the pipe Reynold's number is 6000, the flow is generally |
| A. | viscous |
| B. | laminar |
| C. | turbulent |
| D. | transition |
| Answer» D. transition | |
| 2672. |
Fanning equation is given by. It is applicable to __________ region flow. |
| A. | transition |
| B. | laminar |
| C. | turbulent |
| D. | both (b) and (c) |
| Answer» E. | |
| 2673. |
With a constant diameter impeller of a centrifugal pump |
| A. | its capacity varies directly as the square of speed. |
| B. | head varies as the square of speed. |
| C. | horsepower input varies as the square of speed. |
| D. | head varies as the speed. |
| Answer» C. horsepower input varies as the square of speed. | |
| 2674. |
For water, when the pressure increases, the viscosity |
| A. | also increases |
| B. | decreases |
| C. | remains constant |
| D. | first decreases, and then increases |
| Answer» E. | |
| 2675. |
The head loss due to sudden expansion is |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/3-29-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/3-29-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/3-29-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/3-29-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/3-29-3.png"> | |
| 2676. |
Cd for the orifice plate varies from |
| A. | 0.58 to 0.8 |
| B. | 0.93 to 0.98 |
| C. | 0.2 to 0.3 |
| D. | 0.02 to 0.03 |
| Answer» B. 0.93 to 0.98 | |
| 2677. |
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an |
| A. | pitot tube |
| B. | venturimeter |
| C. | orificemeter |
| D. | rotameter |
| Answer» B. venturimeter | |
| 2678. |
The specific speed of a pump is defined as the speed of a unit of such a size, that it |
| A. | delivers unit discharge at unit head. |
| B. | requires unit power for unit head. |
| C. | delivers unit discharge at unit power. |
| D. | none of these. |
| Answer» B. requires unit power for unit head. | |
| 2679. |
Rubber latex is an example of a __________ .fluid. |
| A. | pseudoplastic |
| B. | bingham plastic |
| C. | dilatent |
| D. | Newtonion |
| Answer» B. bingham plastic | |
| 2680. |
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. | |
| 2681. |
Poise is converted into stoke by |
| A. | multiplying with density (gm/c.c). |
| B. | dividing by density (gm/c.c). |
| C. | multiplying with specific gravity. |
| D. | dividing by specific gravity. |
| Answer» C. multiplying with specific gravity. | |
| 2682. |
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid. |
| A. | dilatant |
| B. | pseudoplastic |
| C. | Bingham plastic |
| D. | Newtonion |
| Answer» B. pseudoplastic | |
| 2683. |
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. | |
| 2684. |
The pressure co-efficient is the ratio of pressure forces to __________ forces. |
| A. | viscous |
| B. | inertial |
| C. | gravity |
| D. | surface tension |
| Answer» B. inertial | |
| 2685. |
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. | |
| 2686. |
The equation given below is called the __________ . f-0.5 = 4.07 loge (NRef)-0.6 |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | none of these |
| Answer» C. Fanning equation | |
| 2687. |
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. | |
| 2688. |
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). | |
| 2689. |
Mach number is the ratio of the speed of the |
| A. | fluid to that of the light. |
| B. | light to that of the fluid. |
| C. | fluid to that of the sound. |
| D. | sound to that of the fluid. |
| Answer» D. sound to that of the fluid. | |
| 2690. |
A piezometer opening measures the __________ fluid pressure. |
| A. | static |
| B. | undisturbed |
| C. | total |
| D. | dynamic |
| Answer» C. total | |
| 2691. |
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. | |
| 2692. |
Pick out the Blake-Plummer equation (valid for large NRe) for fluid flow through beds of solids. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-4.png"> |
| Answer» E. | |
| 2693. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, = fluid viscosity) |
| A. | 1/ |
| B. | |
| C. | 2 |
| D. | 1/ 2 |
| Answer» C. 2 | |
| 2694. |
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 | |
| 2695. |
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. | |
| 2696. |
The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as |
| A. | evaporation |
| B. | cavitation |
| C. | sublimation |
| D. | stripping |
| Answer» C. sublimation | |
| 2697. |
Working of a __________ pump characterises mixed flow. |
| A. | turbine |
| B. | piston |
| C. | diaphragm |
| D. | none of these |
| Answer» B. piston | |
| 2698. |
The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-622-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-622-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-622-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/44-622-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/fluid-mechanics/44-622-2.png"> | |
| 2699. |
In case of venturimeters, friction losses are about __________ percent of maximum velocity head. |
| A. | 2 |
| B. | 8 |
| C. | 12 |
| D. | 20 |
| Answer» B. 8 | |
| 2700. |
With increase in the schedule number of a pipe of a particular nominal size, the |
| A. | wall thickness also increases. |
| B. | I.D. of the pipe decreases. |
| C. | O.D. of the pipe remains constant. |
| D. | all (a), (b) and (c) |
| Answer» E. | |