MCQOPTIONS
Saved Bookmarks
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.
| 2551. |
Which of the following exemplifies a three dimensional fluid flow ? |
| A. | Fluid flow at the inlet to a nozzle |
| B. | Fluid flow between parallel plates |
| C. | Viscous fluid flow between converging plates |
| D. | None of these |
| Answer» B. Fluid flow between parallel plates | |
| 2552. |
For very low pressure and high discharge rate, the compressor used is a/an __________ compressor. |
| A. | axial |
| B. | reciprocating |
| C. | rotary |
| D. | none of these |
| Answer» D. none of these | |
| 2553. |
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) | |
| 2554. |
What is the speed of sound (m/sec) in ordinary water ? |
| A. | 1500 |
| B. | 330 |
| C. | 1000 |
| D. | 3000 |
| Answer» B. 330 | |
| 2555. |
Two piping system are said to be equivalent, when the __________ are same. |
| A. | fluid flow rate & friction loss |
| B. | length & friction factor |
| C. | diameter & friction factor |
| D. | length & diameter |
| Answer» B. length & friction factor | |
| 2556. |
Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure. |
| A. | press |
| B. | turbine |
| C. | pump |
| D. | coupling |
| Answer» B. turbine | |
| 2557. |
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was p. For the same discharge, the pressure drop across globe valve is |
| A. | p |
| B. | < p |
| C. | > p |
| D. | p |
| E. | <sup>2</sup> |
| Answer» D. p | |
| 2558. |
The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.94 |
| D. | 1 |
| Answer» C. 0.94 | |
| 2559. |
Purpose of air lift pump is to |
| A. | compress air. |
| B. | lift compressed air. |
| C. | lift water from a well by using compressed air. |
| D. | lift air under negative pressure. |
| Answer» D. lift air under negative pressure. | |
| 2560. |
Pick out the correct statement pertaining to venturimeter. |
| A. | A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward. |
| B. | The co-efficient of contraction of a venturimeter is always unity. |
| C. | For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected. |
| D. | none of these. |
| Answer» E. | |
| 2561. |
Non-colloidal solution is an example of the __________ fluid. |
| A. | non-Newtonion |
| B. | Newtonion |
| C. | dilatent |
| D. | pseudoplastic |
| Answer» C. dilatent | |
| 2562. |
Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe. |
| A. | diameter |
| B. | colour |
| C. | altitude |
| D. | none of these |
| Answer» C. altitude | |
| 2563. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 m is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 2564. |
The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by |
| A. | 4x |
| B. | 2x |
| C. | x |
| D. | <span class="root">x</span> |
| Answer» D. <span class="root">x</span> | |
| 2565. |
Hydraulic radius of 6" x 12" cross-section, is __________ inches. |
| A. | 2 |
| B. | 0.5 |
| C. | 1.5 |
| D. | none of these |
| Answer» B. 0.5 | |
| 2566. |
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. | |
| 2567. |
Which of the following equations is valid for laminar flow of a fluid through packed bed? |
| A. | Fanning equation |
| B. | Kozney - Karman equation |
| C. | Hagen-Poiseuille equation |
| D. | Blake-Plummer equation |
| Answer» C. Hagen-Poiseuille equation | |
| 2568. |
A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-791-2.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-791-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-791-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/61-791-5.png"> |
| Answer» E. | |
| 2569. |
Enamels and paints are generally __________ fluid. |
| A. | reheopectic |
| B. | pseudo-plastic |
| C. | thixotropic |
| D. | dilatant |
| Answer» C. thixotropic | |
| 2570. |
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. | |
| 2571. |
Flow measurement in an open channel is done by a/an |
| A. | venturimeter |
| B. | orificemeter |
| C. | weir |
| D. | rotameter |
| Answer» D. rotameter | |
| 2572. |
Newton's law of viscosity relates the |
| A. | shear stress and velocity. |
| B. | velocity gradient and pressure intensity. |
| C. | shear stress and rate of angular deformation in a fluid. |
| D. | pressure gradient and rate of angular deformation. |
| Answer» D. pressure gradient and rate of angular deformation. | |
| 2573. |
Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings. |
| A. | incompressible |
| B. | non-viscous |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2574. |
The ratio of inertial forces to viscous forces is called the __________ number. |
| A. | Weber |
| B. | Mach |
| C. | Froude |
| D. | Reynold |
| Answer» E. | |
| 2575. |
Prandtl mixing length is |
| A. | applicable to laminar flow problems. |
| B. | a universal constant. |
| C. | zero at the pipe wall. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2576. |
Ratio of inertial forces to surface tension forces is called the __________ number. |
| A. | Euler |
| B. | Froude |
| C. | Mach |
| D. | Weber |
| Answer» E. | |
| 2577. |
The time of oscillation of a floating body is |
| A. | longer, if metacentric height is increased. |
| B. | independent of the metacentric height. |
| C. | dependent on the buoyant forces only. |
| D. | none of these. |
| Answer» E. | |
| 2578. |
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). | |
| 2579. |
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 106 approximately ? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 2580. |
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/56-744-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/56-744-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/56-744-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/56-744-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/56-744-3.png"> | |
| 2581. |
The ratio of pressure forces to inertial forces is called the __________ number. |
| A. | Froude |
| B. | Euler |
| C. | Reynold |
| D. | Mach |
| Answer» C. Reynold | |
| 2582. |
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent.D. Fluid is compressible.E. Fluid is incompressible. |
| A. | A, C, D |
| B. | B, D, E |
| C. | A, B, E |
| D. | A, D, E |
| Answer» D. A, D, E | |
| 2583. |
Cavitation in a centrifugal pump results from |
| A. | high discharge pressure |
| B. | low barometric pressure |
| C. | high discharge velocity |
| D. | high discharge rate |
| Answer» C. high discharge velocity | |
| 2584. |
For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is |
| A. | 0.5 |
| B. | 1 |
| C. | 0.66 |
| D. | < 0.5 |
| Answer» C. 0.66 | |
| 2585. |
For an ideal fluid flow, Reynolds number is |
| A. | 2100 |
| B. | 100 |
| C. | 0 |
| D. | |
| Answer» E. | |
| 2586. |
Pick out the wrong statement about cavitation. |
| A. | Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation. |
| B. | Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities. |
| C. | Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise. |
| D. | Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades. |
| Answer» E. | |
| 2587. |
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 cross-section. |
| 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 cross-section. | |
| 2588. |
Which of the following facilitates close control of flow of fluids ? |
| A. | Gate valve |
| B. | Globe valve |
| C. | Butterfly valve |
| D. | Check valve |
| Answer» C. Butterfly valve | |
| 2589. |
Fanning friction factor equation applies to the __________ fluid flow. |
| A. | non-isothermal condition of |
| B. | compressible |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» E. | |
| 2590. |
When a fluid flows over a solid surface, the |
| A. | velocity is uniform at any cross-section. |
| B. | velocity gradient is zero at the solid surface. |
| C. | resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves. |
| D. | velocity is not zero at the solid surface. |
| Answer» C. resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves. | |
| 2591. |
Stoke's equation is valid in the Reynolds number range |
| A. | 0.01 to 0.1 |
| B. | 0.1 to 2 |
| C. | 2 to 10 |
| D. | 10 to 100 |
| Answer» B. 0.1 to 2 | |
| 2592. |
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid. |
| A. | Newtonion |
| B. | Non-Newtonion |
| C. | ideal |
| D. | incompressible |
| Answer» B. Non-Newtonion | |
| 2593. |
Existence of boundary layer in fluid flow is because of the |
| A. | surface tension |
| B. | fluid density |
| C. | fluid viscosity |
| D. | gravity forces |
| Answer» D. gravity forces | |
| 2594. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm2. |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 2595. |
The velocity for subsonic flow in a pipeline |
| A. | increases in the downstream direction. |
| B. | is constant. |
| C. | decreases in the downstream direction. |
| D. | is independent of the area of flow. |
| Answer» B. is constant. | |
| 2596. |
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential. |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 2597. |
Equivalent length of a pipe fitting is |
| A. | dependent on Reynolds number. |
| B. | independent of Reynolds number. |
| C. | dependent on the length of the pipe. |
| D. | none of these. |
| Answer» B. independent of Reynolds number. | |
| 2598. |
Air vessel provided in a reciprocating pump is for |
| A. | increasing the acceleration head. |
| B. | making the friction in pipe uniform. |
| C. | decreasing the acceleration head. |
| D. | none of these. |
| Answer» C. decreasing the acceleration head. | |
| 2599. |
A streamline is a line in flow field, |
| A. | that is traced by all the fluid particles passing through a given point. |
| B. | along which a fluid particle travels. |
| C. | such that at every point on it, the velocity is tangential to it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2600. |
A hydraulic accumulator comprises of |
| A. | a storage device and a control valve. |
| B. | a cylinder and a plunger. |
| C. | two pistons and two cylinders. |
| D. | a storage tank and a ram pump. |
| Answer» C. two pistons and two cylinders. | |