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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.
| 2701. |
Turbine impeller |
| A. | produces only radial current. |
| B. | produces only tangential current. |
| C. | is effective over wide range of viscosities. |
| D. | does not produce tangential current. |
| Answer» D. does not produce tangential current. | |
| 2702. |
Friction produced by the formation of wakes is called the __________ friction. |
| A. | disk |
| B. | skin |
| C. | form |
| D. | none of these |
| Answer» D. none of these | |
| 2703. |
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary |
| A. | directly as square of gas density. |
| B. | directly as gas density. |
| C. | directly as square root of gas density. |
| D. | inversely as gas density. |
| Answer» C. directly as square root of gas density. | |
| 2704. |
Capillary tube method of viscosity measurement is based on the |
| A. | Hagen-Poiseulle's equation |
| B. | Stoke's law |
| C. | Navier-stokes equation |
| D. | none of these |
| Answer» B. Stoke's law | |
| 2705. |
It is possible to integrate an automatic flow controller to a |
| A. | flow nozzle |
| B. | venturimeter |
| C. | rotameter |
| D. | none of these |
| Answer» D. none of these | |
| 2706. |
The momentum correction factor for the velocity distribution of laminar flow is |
| A. | 1.3 |
| B. | 1.66 |
| C. | 2.5 |
| D. | none of these |
| Answer» E. | |
| 2707. |
For the same flow rate of a fluid, the pressure drop is the least for |
| A. | venturimeter |
| B. | orificemeter |
| C. | flow-nozzle |
| D. | p is same for all |
| Answer» B. orificemeter | |
| 2708. |
The valve commonly used in pipes larger than 2" dia is a |
| A. | globe valve |
| B. | plug-cock |
| C. | gate valve |
| D. | check valve |
| Answer» D. check valve | |
| 2709. |
Foot valves are provided in the suction line of a centrifugal pump to |
| A. | avoid priming, every time we start the pump. |
| B. | remove the contaminant present in the liquid. |
| C. | minimise the fluctuation in discharge. |
| D. | control the liquid discharge. |
| Answer» B. remove the contaminant present in the liquid. | |
| 2710. |
In power law, , then the fluid is |
| A. | Newtonian |
| B. | dilatant |
| C. | thixotropic |
| D. | rheopectic |
| Answer» B. dilatant | |
| 2711. |
The buoyant force acting on a floating body is dependent on the |
| A. | viscosity of the liquid. |
| B. | weight of the liquid displaced. |
| C. | depth of immersion of the body. |
| D. | surface tension of the liquid. |
| Answer» C. depth of immersion of the body. | |
| 2712. |
A Newtonion fluid is that |
| A. | which follows Newton's law of motion. |
| B. | which needs a minimum shear, before it starts deforming. |
| C. | for which shear & deformation are related as |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/40-570-1.png"> |
| E. | none of these. |
| Answer» D. <img src="/_files/images/chemical-engineering/fluid-mechanics/40-570-1.png"> | |
| 2713. |
Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter. |
| A. | two |
| B. | three |
| C. | four |
| D. | eight |
| Answer» D. eight | |
| 2714. |
The line of action of the buoyant force acts through the |
| A. | centroid of the displaced volume of fluid. |
| B. | centre of gravity of a submerged body. |
| C. | centroid of the volume of any floating body. |
| D. | none of these. |
| Answer» B. centre of gravity of a submerged body. | |
| 2715. |
Cavitation in a centrifugal pump can be avoided by keeping the |
| A. | inlet pressure high |
| B. | outlet pressure low |
| C. | inlet pressure low |
| D. | outlet pressure high |
| Answer» B. outlet pressure low | |
| 2716. |
Vane anemometer |
| A. | is an area meter. |
| B. | is a variable head meter. |
| C. | rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2717. |
Cocks are used to control |
| A. | water |
| B. | any liquid |
| C. | solids |
| D. | none of these |
| Answer» C. solids | |
| 2718. |
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. | |
| 2719. |
The friction factor is |
| A. | always inversely proportional to the Reynolds number. |
| B. | not dimensionless. |
| C. | not dependent on the roughness of the pipe. |
| D. | none of these. |
| Answer» E. | |
| 2720. |
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 | |
| 2721. |
Check valve is used for __________ flow. |
| A. | very precise control of |
| B. | unidirectional |
| C. | multidirectional |
| D. | none of these |
| Answer» C. multidirectional | |
| 2722. |
Capacity of a rotary gear pump can be varied by |
| A. | changing the speed of rotation. |
| B. | bleeding air into suction. |
| C. | bypassing liquid from the suction or discharge line. |
| D. | all (a), (6) and (c). |
| Answer» E. | |
| 2723. |
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor. |
| A. | brings about no further reduction of |
| B. | increases |
| C. | decreases |
| D. | none of these |
| Answer» B. increases | |
| 2724. |
Power number is the ratio of |
| A. | drag stress to inertial stress. |
| B. | inertial stress to drag stress. |
| C. | inertial stress to gravitational stress. |
| D. | gravitational stress to drag stress. |
| Answer» B. inertial stress to drag stress. | |
| 2725. |
Unsteady non-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» D. expanding tube at constant rate. | |
| 2726. |
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, then the new head will be __________ metres. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 5.5 |
| Answer» B. 4 | |
| 2727. |
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. | |
| 2728. |
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic ? |
| A. | Sewage sludge |
| B. | Rubber latex |
| C. | Blood |
| D. | Sugar solution |
| Answer» B. Rubber latex | |
| 2729. |
The capacity of a centrifugal pump Can be increased by increasing the |
| A. | impeller diameter or speed. |
| B. | number of pumps and joining them in series, |
| C. | number of pumps and joining them in parallel. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2730. |
The rate of shear versus the shear stress curves are time dependent for __________ fluid. |
| A. | thixotropic |
| B. | rheopectic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 2731. |
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 | |
| 2732. |
A pressure of 10 m head of water is equivalent to __________ kN/m2. |
| A. | 98 |
| B. | 147 |
| C. | 196 |
| D. | 49 |
| Answer» B. 147 | |
| 2733. |
A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be |
| A. | 100 |
| B. | 200 |
| C. | 320 |
| D. | 160 |
| Answer» C. 320 | |
| 2734. |
The pressure head of a flow meter remains constant for |
| A. | venturimeter |
| B. | orificemeter |
| C. | rotameter |
| D. | pitot tube |
| Answer» D. pitot tube | |
| 2735. |
A venturimeter can not be used for the direct measurement of |
| A. | datum difference in the stretch of pipeflow |
| B. | pressure difference in the flow throughpipeline. |
| C. | friction loss in pipe flow. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2736. |
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double |
| A. | head |
| B. | discharge |
| C. | efficiency |
| D. | none of these |
| Answer» C. efficiency | |
| 2737. |
Which of the following is used for very accurate measurement of flow of gas at low velocity ? |
| A. | Pitot tube |
| B. | Rotameter |
| C. | Segmental orificemeter |
| D. | Hot wire annemometer |
| Answer» E. | |
| 2738. |
Bernoull's equation does not apply to the functioning of a/an |
| A. | venturimeter |
| B. | orificem |
| C. | pitot tube |
| D. | none of these |
| Answer» E. | |
| 2739. |
For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship. |
| A. | logarithmic |
| B. | parabolic |
| C. | hyperbolic |
| D. | linear |
| Answer» C. hyperbolic | |
| 2740. |
The Prandtl mixing length is |
| A. | zero at the pipe wall and is a universal constant. |
| B. | independent of radial distance from the pipe axis. |
| C. | independent of the shear stress. |
| D. | useful for computing laminar flow problems. |
| Answer» E. | |
| 2741. |
N2Re/NFr is called the __________ number. |
| A. | Brinkman |
| B. | Galileo |
| C. | Archimedes |
| D. | Euler |
| Answer» C. Archimedes | |
| 2742. |
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 | |
| 2743. |
Turbulent flow generally occurs for cases involving |
| A. | highly viscous fluid |
| B. | very narrow passages |
| C. | very slow motion |
| D. | none of these |
| Answer» E. | |
| 2744. |
Lower BWG means __________ of the tube. |
| A. | lower thickness |
| B. | lower cross-section |
| C. | outer diameter |
| D. | inner diameter |
| Answer» C. outer diameter | |
| 2745. |
Which of the following pipe bends will incur the largest head loss ? |
| A. | U-bend |
| B. | 30 bend |
| C. | 45 bend |
| D. | 90 bend |
| Answer» B. 30 bend | |
| 2746. |
Which is the most efficient and best for measuring very small flow rate of gases ? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Rotameter |
| D. | Flow nozzle |
| Answer» D. Flow nozzle | |
| 2747. |
When the water is warm, the height to which it can be lifted by a pump |
| A. | decreases due to reduced viscosity. |
| B. | decreases due to reduced vapour pressure. |
| C. | increases due to increased vapour pressure |
| D. | decreases due to increased frictional resistance. |
| Answer» C. increases due to increased vapour pressure | |
| 2748. |
Pipes having diameter 14 inches or more are designated by their |
| A. | outside diameter |
| B. | inside diameter |
| C. | schedule number |
| D. | none of these |
| Answer» B. inside diameter | |
| 2749. |
Which of the following is the most common pump for pumping either raw sewage or sludge ? |
| A. | Electromagnetic pump |
| B. | Centrifugal pump |
| C. | Reciprocating pump |
| D. | Gear pump |
| Answer» D. Gear pump | |
| 2750. |
For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to ( P)n, where P is the pressure drop. The value of exponent 'n' is |
| A. | 1 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |