MCQOPTIONS
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MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
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 | |
| 802. |
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is? |
| A. | 90 |
| B. | 60 |
| C. | 45 |
| D. | 30 |
| Answer» C. 45 | |
| 803. |
Purpose of relief valve in a reciprocating pump is to? |
| A. | Protect the pump against developing excessive pressure |
| B. | Facilitate unidirectional flow of liquid |
| C. | Reduce the discharge pressure |
| D. | Control the rate of discharge |
| Answer» B. Facilitate unidirectional flow of liquid | |
| 804. |
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.? |
| A. | 10 m |
| B. | 11 m |
| C. | 12 m |
| D. | 20 m |
| Answer» C. 12 m | |
| 805. |
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.? |
| A. | For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter |
| B. | Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter |
| C. | Venturimeter occupies less space than an orificemeter |
| D. | Venturimeter incurs less power loss compared to an equivalent orificemeter |
| Answer» D. Venturimeter incurs less power loss compared to an equivalent orificemeter | |
| 806. |
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 | |
| 807. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re |
| A. | Increases linearly with V |
| B. | Decreases linearly with V |
| C. | Decreases as V² |
| D. | None of these |
| Answer» B. Decreases linearly with V | |
| 808. |
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.? |
| A. | ‚à Ç/‚à Çt = 0 |
| B. | ‚à Ç/‚à Çt = constant |
| C. | ‚à Ç/‚à Çs = 0 |
| D. | ‚à Ç/‚à Çt = constant |
| Answer» D. ‚Äö√ √á/‚Äö√ √át = constant | |
| 809. |
Toothpaste is a? |
| A. | Bingham plastic |
| B. | Pseudoplastic |
| C. | Newtonion liquid |
| D. | Dilatent |
| Answer» E. | |
| 810. |
A differential pressure cell is used for? |
| A. | Measuring small pressure difference in gases |
| B. | Measuring small pressure difference in liquids |
| C. | Remote recording of pressure difference |
| D. | Measuring the difference of the impact & the static pressure |
| Answer» D. Measuring the difference of the impact & the static pressure | |
| 811. |
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss? |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | Increases linearly |
| Answer» D. Increases linearly | |
| 812. |
Specific speed of a centrifugal pump relates it with another pump having the? |
| A. | Dynamic similarity |
| B. | Same efficiency |
| C. | Same speed |
| D. | Geometrical similarity |
| Answer» B. Same efficiency | |
| 813. |
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. | |
| 814. |
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)? |
| A. | Vavg |
| B. | 1.2 Vavg |
| C. | 1.5 Vavg |
| D. | 1.8 Vavg |
| Answer» C. 1.5 Vavg | |
| 815. |
For water, when the pressure increases, the viscosity? |
| A. | Also increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First decreases, and then increases |
| Answer» E. | |
| 816. |
The continuity equation? |
| A. | Relates mass flow rate along a stream tube |
| B. | Relates work and energy |
| C. | Stipulates that Newton's second law of motion must be satisfied at every point in the fluid |
| D. | None of these |
| Answer» B. Relates work and energy | |
| 817. |
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be? |
| A. | Δp |
| B. | 2Δp |
| C. | Δp² |
| D. | Δp/2 |
| Answer» C. ≈í√Æp¬¨‚⧠| |
| 818. |
For the manometer set up shown in the figure, the pressure difference PA - PB is given by? |
| A. | (ρH - ρair)gH |
| B. | (ρH - ρL)gH |
| C. | (ρH - ρL) gH + (ρL - ρair) . g(L - H) |
| D. | (ρH - ρL) gL + (ρL - ρair)gH |
| Answer» B. (≈ì√ÖH - ≈ì√ÖL)gH | |
| 819. |
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 | |
| 820. |
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.? |
| A. | Bearing losses |
| B. | Disk friction |
| C. | Shock losses |
| D. | Cavitation |
| Answer» D. Cavitation | |
| 821. |
For a particle settling in water at its terminal settling velocity, which of the following is true?? |
| A. | Buoyancy = weight + drag |
| B. | Weight = buoyancy + drag |
| C. | Drag = buoyancy + weight |
| D. | Drag = weight |
| Answer» C. Drag = buoyancy + weight | |
| 822. |
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature.? |
| A. | Lower than |
| B. | Higher than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 823. |
The discharge through a rectangular weir varies as? |
| A. | H1/2 |
| B. | H5/2 |
| C. | H2/5 |
| D. | H3/2 |
| Answer» E. | |
| 824. |
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 | |
| 825. |
Efficiency of power transmission (η) 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 | |
| 826. |
Mercury is an ideal barometric fluid mainly due to its? |
| A. | High density |
| B. | Low compressibility |
| C. | Low capillary action |
| D. | Very low vapor pressure |
| Answer» E. | |
| 827. |
Rubber latex is an example of __________ fluid.? |
| A. | Dilatent |
| B. | Newtonion |
| C. | Pseudoplastic |
| D. | Bingham plastic |
| Answer» D. Bingham plastic | |
| 828. |
Acceleration head in a reciprocating pump? |
| A. | Increases the work done during delivery stroke |
| B. | Decreases the work done during suction stroke |
| C. | Does not change the work requirement of the pump |
| D. | Increases the work done during suction stroke |
| Answer» D. Increases the work done during suction stroke | |
| 829. |
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.? |
| A. | Axial |
| B. | Radial |
| C. | Mixed |
| D. | None of these |
| Answer» B. Radial | |
| 830. |
Flow measurement in an open channel is done by a/an? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Weir |
| D. | Rotameter |
| Answer» D. Rotameter | |
| 831. |
Discharge in laminar flow through a pipe varies? |
| A. | As the square of the radius |
| B. | Inversely as the pressure drop |
| C. | Inversely as the viscosity |
| D. | As the square of the diameter |
| Answer» B. Inversely as the pressure drop | |
| 832. |
For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).? |
| A. | 1/D |
| B. | 1/D² |
| C. | 1/D⁵ |
| D. | D² |
| Answer» D. D¬¨‚⧠| |
| 833. |
Remote control valve is a __________ valve.? |
| A. | Gate |
| B. | Butterfly |
| C. | Needle |
| D. | Globe |
| Answer» C. Needle | |
| 834. |
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?? |
| A. | At the centre |
| B. | At d/4 from the wall |
| C. | At the wall |
| D. | At d/8 from the wall |
| Answer» D. At d/8 from the wall | |
| 835. |
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 | |
| 836. |
Small pressure differences in liquids is measured using a/an? |
| A. | U-tube manometer |
| B. | Inclined tube manometer |
| C. | Pitot tube |
| D. | None of these |
| Answer» C. Pitot tube | |
| 837. |
Head developed by a centrifugal pump depends on its? |
| A. | Speed |
| B. | Impeller diameter |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 838. |
In case of centrifugal fan or blower, the gas capacity varies as? |
| A. | Speed |
| B. | (speed)2 |
| C. | (speed)3 |
| D. | (speed)0.5 |
| Answer» B. (speed)2 | |
| 839. |
An equipotential line is __________ to the velocity vector at every point.? |
| A. | Normal |
| B. | Normal |
| C. | Tangential |
| D. | None of these |
| Answer» B. Normal | |
| 840. |
Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds? |
| A. | 4000 |
| B. | 2100 |
| C. | 1500 |
| D. | 3000 |
| Answer» C. 1500 | |
| 841. |
Minimum fluidisation velocity for a specific system depends upon the? |
| A. | Particle size |
| B. | Fluid viscosity |
| C. | Density of both the particle & the fluid |
| D. | All of the above |
| Answer» E. | |
| 842. |
Absolute viscosity of a fluid is a function of the __________ of the fluid.? |
| A. | Motion |
| B. | Pressure & temperature |
| C. | Shearing stress |
| D. | Both B & C |
| Answer» E. | |
| 843. |
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 | |
| 844. |
The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is? |
| A. | Q‚à ùN : H‚à ùN¬≤ : P‚à ùN¬≥ |
| B. | Q‚à ùN¬≤ : H‚à ùN¬≥ : P‚à ùN |
| C. | Q‚à ùN : H‚à ùN¬≥ : P‚à ùN¬≤ |
| D. | Q‚à ùN¬≥ : H‚à ùN : P‚à ùN¬≤ |
| Answer» B. Q‚Äö√ √πN¬¨‚⧠: H‚Äö√ √πN¬¨‚â• : P‚Äö√ √πN | |
| 845. |
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 | |
| 846. |
For an ideal fluid flow, Reynolds number is? |
| A. | 2100 |
| B. | 100 |
| C. | 0 |
| D. | ‚à û |
| Answer» E. | |
| 847. |
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 | |
| 848. |
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the? |
| A. | Square of the radial distance |
| B. | Radial distance linearly |
| C. | Inverse of the radial distance |
| D. | Elevation along vertical direction |
| Answer» B. Radial distance linearly | |
| 849. |
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 | |
| 850. |
Bernoulli's equation is dependent on the? |
| A. | First law of thermodynamics |
| B. | Third law of thermodynamics |
| C. | Law of conservation of momentum |
| D. | None of these |
| Answer» E. | |