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.
| 2751. |
Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have |
| A. | very low speeds. |
| B. | smaller discharge. |
| C. | higher capital &maintenance cost. |
| D. | high vibrations. |
| Answer» D. high vibrations. | |
| 2752. |
In fluid flow, the boundary layer separation can not occur |
| A. | in case of boundaries experiencing form drag. |
| B. | at points of abrupt changes in the flow directions. |
| C. | in laminar flow. |
| D. | none of these. |
| Answer» E. | |
| 2753. |
For a given fluid flow rate, which of the following incurs maximum head loss ? |
| A. | Orifice meter |
| B. | Venturimeter |
| C. | Flow nozzle |
| D. | All of them incur the same head loss |
| Answer» B. Venturimeter | |
| 2754. |
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases. |
| A. | NPSH required. |
| B. | BHP required by the pump. |
| C. | head of the liquid pumped. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2755. |
N. second/m2 is |
| A. | the S.I. unit of dynamic viscosity. |
| B. | the S.I. unit of kinematic viscosity. |
| C. | equivalent to one poise. |
| D. | equivalent to one stoke. |
| Answer» B. the S.I. unit of kinematic viscosity. | |
| 2756. |
If the head over the triangular notch is doubled, the discharge will increase by __________ times. |
| A. | 2 |
| B. | 2.828 |
| C. | 5.657 |
| D. | 4 |
| Answer» D. 4 | |
| 2757. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will |
| A. | increase. |
| B. | decrease. |
| C. | remain unchanged. |
| D. | increase or decrease depending on the pipe material. |
| Answer» B. decrease. | |
| 2758. |
Experimental study of laminar fluid flow through a circular tube was conducted by |
| A. | Reynolds |
| B. | Hagen and Poiseuille |
| C. | Pascal |
| D. | Blake-Plummer |
| Answer» C. Pascal | |
| 2759. |
The most economical flow control valve for use with large diameter pipes is a |
| A. | butterfly valve |
| B. | globe valve |
| C. | needle valve |
| D. | none of these |
| Answer» B. globe valve | |
| 2760. |
Each term in Bernaulli's equation represents the __________ of the fluid. |
| A. | energy per unit mass |
| B. | energy per unit weight |
| C. | force per unit mass |
| D. | none of these |
| Answer» C. force per unit mass | |
| 2761. |
Which of the following is a dimensionless parameter ? |
| A. | Angular velocity |
| B. | Specific weight |
| C. | Kinematic viscosity |
| D. | None of these |
| Answer» E. | |
| 2762. |
In frictional fluid flow, the quantity, , is |
| A. | constant along a streamline. |
| B. | not constant along a streamline. |
| C. | increased in the direction of flow. |
| D. | none of these. |
| Answer» C. increased in the direction of flow. | |
| 2763. |
Hydraulic radius is the ratio of |
| A. | wetted perimeter to flow area. |
| B. | flow area to wetted perimeter. |
| C. | flow area to square of wetted perimeter. |
| D. | square root of flow area to wetted perimeter. |
| Answer» C. flow area to square of wetted perimeter. | |
| 2764. |
Power requirement of fans having constant wheel diameter varies __________ fan speed. |
| A. | as square of |
| B. | directly as |
| C. | as cube of |
| D. | none of these |
| Answer» D. none of these | |
| 2765. |
Drag co-efficient in hindered settling is __________ that in free settling. |
| A. | less than |
| B. | equal to |
| C. | not necessarily greater than |
| D. | always greater than |
| Answer» E. | |
| 2766. |
Efficiency of power transmission ( ) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent. |
| A. | 33:3 |
| B. | 50 |
| C. | 66.6 |
| D. | 88.8 |
| Answer» D. 88.8 | |
| 2767. |
__________ forces act on a particle moving through a stationary fluid. |
| A. | Gravity |
| B. | Drag |
| C. | Buoyant |
| D. | all (a), (b), & (c) |
| Answer» E. | |
| 2768. |
Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump? |
| A. | Increasing the impeller speed and the volute area. |
| B. | Increasing the number of vanes in the impeller. |
| C. | Mounting of two or more impellers in series on a single shaft. |
| D. | Either of (a), (b) or (c). |
| Answer» D. Either of (a), (b) or (c). | |
| 2769. |
An equipotential line is __________ to the velocity vector at every point. |
| A. | normal |
| B. | normal |
| C. | tangential |
| D. | none of these |
| Answer» B. normal | |
| 2770. |
Specific speed for a centrifugal pump is |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/24-339-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/24-339-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/24-339-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/24-339-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/fluid-mechanics/24-339-2.png"> | |
| 2771. |
Path followed by water jet issuing from the bottom of a water tank will be a |
| A. | parabola (vertex being at the opening). |
| B. | hyperbola. |
| C. | horizontal straight line. |
| D. | zig-zag path (which is geometrically undefined). |
| Answer» B. hyperbola. | |
| 2772. |
Which of the following produces maximum pressure difference for transportation of gases ? |
| A. | Vaccum pumps |
| B. | Blowers |
| C. | Fans |
| D. | Compressors |
| Answer» E. | |
| 2773. |
Which of the following is an undesirable property of a manometric liquid ? |
| A. | Non-sticky & non-corrosive nature. |
| B. | High vapour pressure. |
| C. | Low viscosity & surface tension. |
| D. | Low co-efficient of thermal expansion. |
| Answer» C. Low viscosity & surface tension. | |
| 2774. |
Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively |
| A. | efficiency, head and B.H.P. |
| B. | head, efficiency and B.H.P. |
| C. | B.H.P., efficiency and head |
| D. | efficiency, B.H.P. and head |
| Answer» C. B.H.P., efficiency and head | |
| 2775. |
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head. |
| A. | manometric |
| B. | total |
| C. | static |
| D. | friction |
| Answer» B. total | |
| 2776. |
The speed of sound in an ideal gas varies as the |
| A. | temperature |
| B. | pressure |
| C. | density |
| D. | none of these |
| Answer» B. pressure | |
| 2777. |
The maximum head that can be developed by a single impeller is __________ ft. |
| A. | 25 |
| B. | 100 |
| C. | 250-300 |
| D. | 1000 |
| Answer» D. 1000 | |
| 2778. |
The nominal size of a hose pipe is specified by its |
| A. | I.D. |
| B. | O.D. |
| C. | thickness |
| D. | none of these |
| Answer» B. O.D. | |
| 2779. |
Transition from laminar flow to turbulent flow is aided by the |
| A. | surface roughness and curvature (i.e.sharp corners). |
| B. | vibration. |
| C. | pressure gradient and the compressibility of the flowing medium. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 2780. |
The frictional resistance in laminar flow does not depend on the |
| A. | area of surface in contact. |
| B. | flow velocity. |
| C. | fluid temperature. |
| D. | pressure of flow. |
| Answer» B. flow velocity. | |
| 2781. |
A venturimeter measures the |
| A. | velocity head |
| B. | pressure |
| C. | point velocity |
| D. | none of these |
| Answer» E. | |
| 2782. |
Gradually varying fluid flow is an example of __________ flow. |
| A. | non-steady uniform |
| B. | non-steady non-uniform |
| C. | steady uniform |
| D. | steady non-uniform |
| Answer» B. non-steady non-uniform | |
| 2783. |
Drag is the force component exerted on an immersed object, |
| A. | passing the centroid of the body at 60 to the direction of motion. |
| B. | the component being parallel to theflow direction. |
| C. | the component being normal to the flow direction. |
| D. | none of these. |
| Answer» C. the component being normal to the flow direction. | |
| 2784. |
To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump. |
| A. | reciprocating |
| B. | centrifugal |
| C. | volute |
| D. | rotary vacuum |
| Answer» B. centrifugal | |
| 2785. |
For flow of fluids through packed bed, the superficial velocity is |
| A. | less than the average velocity through channels. |
| B. | more than the average velocity through channels. |
| C. | dependent on the pressure drop across the bed. |
| D. | same as the average velocity through channels. |
| Answer» B. more than the average velocity through channels. | |
| 2786. |
Cd is always __________ Cc. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | either more or less than |
| Answer» B. less than | |
| 2787. |
Buoyant force |
| A. | for non-symmetrical bodies is not vertical. |
| B. | depends on the depth of the submergence of the floating body. |
| C. | depends on the weight of the floating body. |
| D. | none of these. |
| Answer» D. none of these. | |
| 2788. |
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 | |
| 2789. |
What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ? |
| A. | 0.5 |
| B. | 0.67 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 2790. |
Foot valve provided in the pump is a __________ valve. |
| A. | direction control |
| B. | back pressure |
| C. | relief |
| D. | pressure reduction |
| Answer» C. relief | |
| 2791. |
The discharge co-efficient for an orificemeter does not depend upon the |
| A. | pipe length. |
| B. | ratio of pipe diameter to orifice diameter. |
| C. | type of orifice & the Reynolds number. |
| D. | pipe diameter. |
| Answer» B. ratio of pipe diameter to orifice diameter. | |
| 2792. |
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-784-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-784-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-784-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/60-784-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/fluid-mechanics/60-784-2.png"> | |
| 2793. |
Interstage coolers are provided in a multistage compressor to |
| A. | save power in compressing a given volume to a given pressure. |
| B. | cool the delivered air. |
| C. | achieve the exact delivery pressure. |
| D. | none of these. |
| Answer» B. cool the delivered air. | |
| 2794. |
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 | |
| 2795. |
During fluid flow, variation of shear stress( ) with velocity gradientat constant pressure temperature is shown below in the figure In the above figure, Binghom plastic is represented by the curve . |
| A. | V |
| B. | II |
| C. | III |
| D. | I |
| Answer» C. III | |
| 2796. |
Speed of sound in an ideal gas depends on its |
| A. | temperature |
| B. | pressure |
| C. | specific volume |
| D. | none of these |
| Answer» B. pressure | |
| 2797. |
A centrifugal pump designed for handling water ( = 1 cp) will deliver __________ when pumping a thicker oil ( = 30 cp). |
| A. | less head & capacity |
| B. | more head |
| C. | more capacity |
| D. | less head & more capacity |
| Answer» B. more head | |
| 2798. |
If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to |
| A. | x |
| B. | x/2 |
| C. | x/3 |
| D. | 2x/3 |
| Answer» B. x/2 | |
| 2799. |
Which of the following assumptions enables the Euler's equation of motion to be integrated ? |
| A. | The fluid is incompressible. |
| B. | The fluid is non-viscous. |
| C. | The continuity equation is satisfied. |
| D. | The flow is rotational and incompressible. |
| Answer» B. The fluid is non-viscous. | |
| 2800. |
In case of a pipe exit fitted with a nozzle, the |
| A. | conversion of kinetic head to pressure head is facilitated. |
| B. | conversion of pressure head to kinetic head is facilitated. |
| C. | power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head. |
| D. | both (b) and (c) |
| Answer» E. | |