MCQOPTIONS
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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.
| 2601. |
Bernoulli's equation for steady, frictionless, continuous flow states that the __________ at all sections is same. |
| A. | total pressure |
| B. | total energy |
| C. | velocity head |
| D. | none of these |
| Answer» C. velocity head | |
| 2602. |
While starting an axial flow pump, its delivery valve should be kept |
| A. | open |
| B. | closed |
| C. | either open or closed |
| D. | none of these |
| Answer» B. closed | |
| 2603. |
__________ forces do not act in case of fluid flow. |
| A. | Elastic |
| B. | Tensile |
| C. | Vibratory |
| D. | Centrifugal |
| Answer» C. Vibratory | |
| 2604. |
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 | |
| 2605. |
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/23-323-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/23-323-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/23-323-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/23-323-4.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/fluid-mechanics/23-323-4.png"> | |
| 2606. |
At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ? |
| A. | 40 and 140 |
| B. | 45 and 60 |
| C. | 90 and 80 |
| D. | 20 and 120 |
| Answer» B. 45 and 60 | |
| 2607. |
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. | |
| 2608. |
Which of the following is dimensionless ? |
| A. | Angular velocity |
| B. | Fanning friction factor |
| C. | Specific volume |
| D. | None of these |
| Answer» C. Specific volume | |
| 2609. |
A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres. |
| A. | 600 |
| B. | 660 |
| C. | 1.1 |
| D. | 60 |
| Answer» C. 1.1 | |
| 2610. |
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump. |
| A. | sump |
| B. | volute |
| C. | vacuum |
| D. | submerged |
| Answer» D. submerged | |
| 2611. |
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. | |
| 2612. |
The head loss due to sudden contraction is proportional to |
| A. | velocity |
| B. | velocity head |
| C. | turbulence |
| D. | none of these |
| Answer» C. turbulence | |
| 2613. |
Cavitation occurs in a centrifugal pump when the suction pressure is |
| A. | less than the vapour pressure of the liquid at that temperature. |
| B. | greater than the vapour pressure of the liquid at that temperature. |
| C. | equal to the vapour pressure. |
| D. | equal to the developed head. |
| Answer» B. greater than the vapour pressure of the liquid at that temperature. | |
| 2614. |
Which of the following can be used for the direct measurement of volumetric flow rate of slurry ? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 2615. |
A pipe is defined as 'hydraulically smooth', if the friction factor |
| A. | is not a function of Reynolds number. |
| B. | for a given Reynolds number remains constant even on further smoothening of the pipe. |
| C. | is zero irrespective of the Reynolds number. |
| D. | none of these. |
| Answer» C. is zero irrespective of the Reynolds number. | |
| 2616. |
A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is |
| A. | 5 |
| B. | 14.1 |
| C. | 56.22 |
| D. | 28.2 |
| Answer» E. | |
| 2617. |
Delivery of insufficient quantity of liquid by a pump may be caused by |
| A. | air leak in the inlet |
| B. | low rpm |
| C. | too high a lift |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 2618. |
Fluid resistance to shear depends upon its |
| A. | rate of transfer of molecular momentum. |
| B. | cohesion. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 2619. |
The Kozney-Carman equation, rewritten in terms of non-dimensional numbers gives ( P/pu2 ) proportional to |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-790-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-790-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-790-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-790-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/fluid-mechanics/61-790-2.png"> | |
| 2620. |
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. | |
| 2621. |
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 | |
| 2622. |
Air vessel of a reciprocating pump is initially filled with |
| A. | atmospheric air |
| B. | compressed air |
| C. | water |
| D. | none of these |
| Answer» C. water | |
| 2623. |
The ratio of inertial forces to gravity forces is called the __________ number. |
| A. | Mach |
| B. | Froude |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |
| 2624. |
Glass pipes can be joined by |
| A. | flanges |
| B. | welding |
| C. | soldering |
| D. | bell and spigot joint |
| Answer» E. | |
| 2625. |
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. | |
| 2626. |
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. | 1/2 |
| Answer» B. <2 | |
| 2627. |
Weber number is the ratio of inertial force to __________ force. |
| A. | surface tension |
| B. | gravity |
| C. | viscous |
| D. | elastic |
| Answer» B. gravity | |
| 2628. |
The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/f)-0.4, is called the __________ equation. |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 2629. |
Pressure drop for turbulent fluid flow through a circular pipe is given by |
| A. | 64/R |
| B. | <sub>e</sub> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-538-2.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-1.png"> |
| E. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-538-4.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-1.png"> | |
| 2630. |
What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ? |
| A. | 0.64 |
| B. | 1.65 |
| C. | 0.32 |
| D. | 0.94 |
| Answer» B. 1.65 | |
| 2631. |
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary. |
| A. | I, II, III |
| B. | II, III, V |
| C. | I, II, V |
| D. | II, IV, V |
| Answer» C. I, II, V | |
| 2632. |
Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ? |
| A. | < 0.3 |
| B. | > 3 |
| C. | 50 |
| D. | 1 |
| Answer» B. > 3 | |
| 2633. |
Boundary layer exists in flow |
| A. | of real fluids. |
| B. | over flat surfaces only. |
| C. | in pipes only. |
| D. | of ideal fluids only. |
| Answer» B. over flat surfaces only. | |
| 2634. |
Rubber latex is an example of __________ fluid. |
| A. | dilatent |
| B. | Newtonion |
| C. | pseudoplastic |
| D. | Bingham plastic |
| Answer» D. Bingham plastic | |
| 2635. |
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) | |
| 2636. |
Terminal velocity is |
| A. | a constant velocity with no acceleration. |
| B. | a fluctuating velocity. |
| C. | attained after moving one-half of total distance. |
| D. | none of these. |
| Answer» B. a fluctuating velocity. | |
| 2637. |
A fluid is a substance, that |
| A. | has to be kept in a closed container. |
| B. | is almost incompressible. |
| C. | has zero shear stress. |
| D. | flows when even a small shear is applied to it. |
| Answer» E. | |
| 2638. |
The pressure intensity is the same in all directions at a point in a fluid |
| A. | only when the fluid is frictionless. |
| B. | only when the fluid is at rest having zero velocity. |
| C. | when there is no motion of one fluid layer relative to an adjacent layer. |
| D. | regardless of the motion of one fluid layer relative to an adjacent layer. |
| Answer» D. regardless of the motion of one fluid layer relative to an adjacent layer. | |
| 2639. |
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. |
| A. | 1.8 |
| B. | 12.4 |
| C. | 186.2 |
| D. | 736.4 |
| Answer» C. 186.2 | |
| 2640. |
Laminar flow is characterised by the nonexistence of |
| A. | pressure fluctuation. |
| B. | eddies. |
| C. | deviating velocities. |
| D. | all (a), (b)&(c). |
| Answer» E. | |
| 2641. |
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length. |
| A. | equivalent |
| B. | transition |
| C. | Prandtl mixing |
| D. | none of these |
| Answer» C. Prandtl mixing | |
| 2642. |
Select the correct practical example of steady non-uniform flow. |
| A. | Motion of water around a ship in a lake. |
| B. | Motion of river around bridge piers. |
| C. | Steadily decreasing flow through a reducing section. |
| D. | Steadily increasing flow through a pipe. |
| Answer» D. Steadily increasing flow through a pipe. | |
| 2643. |
Quicksand is an example of a __________ fluid. |
| A. | bingham plastic |
| B. | dilatent |
| C. | Newtonion |
| D. | pseudoplastic |
| Answer» C. Newtonion | |
| 2644. |
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm. |
| A. | < 4 |
| B. | > 4 |
| C. | > 12.5 |
| D. | < 10 |
| Answer» D. < 10 | |
| 2645. |
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the |
| A. | wall roughness. |
| B. | Reynolds number. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 2646. |
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 | |
| 2647. |
Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number ? |
| A. | Fanning equation |
| B. | Blake-Pllummer equation |
| C. | Hagen-Poiseulle equation |
| D. | Kozney-Karman equation |
| Answer» C. Hagen-Poiseulle equation | |
| 2648. |
The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its |
| A. | viscosity |
| B. | specific volume |
| C. | velocity |
| D. | none of these |
| Answer» C. velocity | |
| 2649. |
Centrifugal pump can't be used to pump |
| A. | molten sodium (used as a coolant in Fast Breeder Reactor). |
| B. | moderately viscous vegetable oil used in soap industry. |
| C. | thick molten soap at 80 C. |
| D. | none of the above. |
| Answer» D. none of the above. | |
| 2650. |
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. | |