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.
| 651. |
_The speed of a sound wave in a gas is analogous to the speed of$? |
| A. | An elementary wave in an open channel |
| B. | Flow in an open channel |
| C. | A disturbance travelling upstream in moving fluid |
| D. | None of these |
| Answer» B. Flow in an open channel | |
| 652. |
_In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow?$? |
| A. | Discharge of water by a centrifugal pump being run at a constant rpm |
| B. | Water flow in the suction and discharge pipe of a reciprocating pump |
| C. | Water discharge from a vertical vessel in which constant level is maintained |
| D. | Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe |
| Answer» C. Water discharge from a vertical vessel in which constant level is maintained | |
| 653. |
_If the discharge of a centrifugal pump is throttled, then its suction lift$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Data insufficient to predict |
| Answer» B. Decreases | |
| 654. |
_Hydraulic radius of 6" x 12" cross-section, is __________ inches.$? |
| A. | 2 |
| B. | 0.5 |
| C. | 1.5 |
| D. | None of these |
| Answer» B. 0.5 | |
| 655. |
_Venturimeter and orificemeter measures the __________ of the fluid.$? |
| A. | Pressure |
| B. | Maximum velocity |
| C. | Average velocity |
| D. | Point velocity |
| Answer» D. Point velocity | |
| 656. |
_Pressure drag does not depend upon the$? |
| A. | Roughness of surface of the body |
| B. | Pressure of main flow only |
| C. | Length of the body in flow direction |
| D. | All of the above |
| Answer» E. | |
| 657. |
_For pipes that must be broken at intervals for maintenance, the connector used should be a/an$? |
| A. | Union |
| B. | Tee |
| C. | Reducer |
| D. | Elbow |
| Answer» B. Tee | |
| 658. |
_Cavitation in a centrifugal pump can be avoided by keeping the$? |
| A. | Inlet pressure high |
| B. | Outlet pressure low |
| C. | Inlet pressure low |
| D. | Outlet pressure high |
| Answer» B. Outlet pressure low | |
| 659. |
_N²Re/NFr is called the __________ number.$? |
| A. | Brinkman |
| B. | Galileo |
| C. | Archimedes |
| D. | Euler |
| Answer» C. Archimedes | |
| 660. |
_For an incompressible fluid, the bulk modulus of elasticity is$? |
| A. | 5 kg/m³ |
| B. | ‚à û N/m¬≤ |
| C. | 1 N |
| D. | 0 N/m |
| Answer» C. 1 N | |
| 661. |
_The capacity of an accumulator is the maximum$? |
| A. | Energy which it can store |
| B. | Discharge which it can deliver |
| C. | Liquid which it can store |
| D. | None of these |
| Answer» B. Discharge which it can deliver | |
| 662. |
___________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm².$? |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 663. |
_The Mach number for hypersonic flow of compressible fluid is$? |
| A. | 1 |
| B. | > 1 |
| C. | > 4 |
| D. | < 2 |
| Answer» D. < 2 | |
| 664. |
_Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)$? |
| A. | D |
| B. | 1/d |
| C. | Σ |
| D. | L/σ |
| Answer» D. L/≈ì√â | |
| 665. |
_Speed of sound in an ideal gas depends on its$? |
| A. | Temperature |
| B. | Pressure |
| C. | Specific volume |
| D. | None of these |
| Answer» B. Pressure | |
| 666. |
_In turbulent flow, the$? |
| A. | Fluid particles move in an orderly manner |
| B. | Momentum transfer is on molecular scale only |
| C. | Shear stress is caused more effectively by cohesion than momentum transfer |
| D. | Shear stresses are generally larger than in a similar laminar flow |
| Answer» E. | |
| 667. |
_Fluidised beds are formed, when the$? |
| A. | Fluid friction is zero |
| B. | Gravity force is less than the fluid friction |
| C. | Pressure forces equal gravity forces |
| D. | Sum of the fluid friction and pressure forces is equal and opposite to gravity forces |
| Answer» C. Pressure forces equal gravity forces | |
| 668. |
_A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is$? |
| A. | 26 |
| B. | 42 |
| C. | 269 |
| D. | 325 |
| Answer» D. 325 | |
| 669. |
_For very low pressure and high discharge rate, the compressor used is a/an __________ compressor.$? |
| A. | Axial |
| B. | Reciprocating |
| C. | Rotary |
| D. | None of these |
| Answer» D. None of these | |
| 670. |
Slurries can be most conveniently pumped by a __________ pump.$? |
| A. | Screw |
| B. | Reciprocating |
| C. | Gear |
| D. | Centrifugal |
| Answer» E. | |
| 671. |
Rubber latex is an example of a __________ .fluid.$? |
| A. | Pseudoplastic |
| B. | Bingham plastic |
| C. | Dilatent |
| D. | Newtonion |
| Answer» B. Bingham plastic | |
| 672. |
Velocity distribution for flow between two fixed parallel plates$? |
| A. | Varies parabolically across the section |
| B. | Is constant over the entire cross-section |
| C. | Is zero at the plates and increases linearly to the midplane |
| D. | None of these |
| Answer» B. Is constant over the entire cross-section | |
| 673. |
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).$? |
| A. | G is above B |
| B. | B is above G |
| C. | B & G coincide |
| D. | None of these |
| Answer» C. B & G coincide | |
| 674. |
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around$? |
| A. | 2000 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» E. | |
| 675. |
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.$? |
| A. | Newtonion |
| B. | Pseudoplastic |
| C. | Dilatent |
| D. | Bingham plastic |
| Answer» C. Dilatent | |
| 676. |
Scale up of agitator design requires$? |
| A. | Geometrical similarity only |
| B. | Dynamic similarity only |
| C. | Both geometrical and dynamic similarity |
| D. | All of the above |
| Answer» E. | |
| 677. |
Fanning friction factor is equal to(where, fB = Blassius friction factor).$? |
| A. | fB/4 |
| B. | fB/2 |
| C. | 4fB |
| D. | 2fB |
| Answer» B. fB/2 | |
| 678. |
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the$? |
| A. | Barometric pressure |
| B. | Speed of the impeller |
| C. | Diameter of the impeller |
| D. | Both B and C |
| Answer» B. Speed of the impeller | |
| 679. |
Manometers measure the __________ pressure.$? |
| A. | Vacuum as well as the atmospheric |
| B. | Difference in |
| C. | Absolute |
| D. | Gage |
| Answer» C. Absolute | |
| 680. |
Most of the centrifugal pumps used in chemical plants are usually __________ driven.$? |
| A. | Steam |
| B. | Diesel engine |
| C. | Electric motor |
| D. | Gas turbine |
| Answer» D. Gas turbine | |
| 681. |
Fluid resistance to shear depends upon its$? |
| A. | Rate of transfer of molecular momentum |
| B. | Cohesion |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 682. |
The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.$? |
| A. | Steady uniform |
| B. | Steady non uniform |
| C. | Unsteady uniform |
| D. | Unsteady non uniform |
| Answer» C. Unsteady uniform | |
| 683. |
A fluid is the one, which$? |
| A. | Cannot remain at rest under the action of shear force |
| B. | Continuously expands till it fills any container |
| C. | Is incompressible |
| D. | Permanently resists distortion |
| Answer» B. Continuously expands till it fills any container | |
| 684. |
A floating/submerged body is always stable, if its centre of gravity$? |
| A. | Lies above its centre of buoyancy |
| B. | And centre of buoyancy coincide |
| C. | Lies below its centre of buoyancy |
| D. | Lies above its meta centre |
| Answer» D. Lies above its meta centre | |
| 685. |
The most serious disadvantage of an orificemeter is that$? |
| A. | It is not very accurate |
| B. | It is very costly |
| C. | Most of the pressure drop is not recoverable |
| D. | It is not suitable for measuring gas flow |
| Answer» D. It is not suitable for measuring gas flow | |
| 686. |
With increase in the schedule number of a pipe of a particular nominal size, the$? |
| A. | Wall thickness also increases |
| B. | I.D. of the pipe decreases |
| C. | O.D. of the pipe remains constant |
| D. | All of the above |
| Answer» E. | |
| 687. |
A tube is specified by its$? |
| A. | Thickness only |
| B. | Outer diameter only |
| C. | Thickness & outer diameter both |
| D. | Inner diameter |
| Answer» D. Inner diameter | |
| 688. |
The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by$? |
| A. | 4x |
| B. | 2x |
| C. | x |
| D. | ‚à öx |
| Answer» D. ‚Äö√ √∂x | |
| 689. |
Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid$? |
| A. | Lies above the centroid of the plane surface |
| B. | Is independent of the specific weight of the fluid |
| C. | Is different for different fluids |
| D. | Is at the centroid of the plane surface |
| Answer» C. Is different for different fluids | |
| 690. |
Pascal law is not applicable for a/an __________ fluid.$? |
| A. | Accelerating frictionless |
| B. | Static |
| C. | Uniformly moving |
| D. | None of these |
| Answer» E. | |
| 691. |
Prandtl number is a measure of the$? |
| A. | Heat conduction to viscosity of a fluid |
| B. | Cp/Cv of a fluid |
| C. | Elastic force to pressure force in the fluid flow |
| D. | Inertial force to elastic force in the fluid flow |
| Answer» B. Cp/Cv of a fluid | |
| 692. |
For flow of fluids through packed bed, the superficial velocity is$? |
| 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 | |
| 693. |
Which of the fluid forces are not considered in the Reynold's equation of flow?$? |
| A. | Viscous forces |
| B. | Turbulent forces |
| C. | Pressure forces |
| D. | Compressibility forces |
| Answer» E. | |
| 694. |
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes$? |
| A. | Less than atmospheric pressure |
| B. | More than liquid vapor pressure |
| C. | Less than liquid vapor pressure |
| D. | More than atmospheric pressure |
| Answer» D. More than atmospheric pressure | |
| 695. |
Which of the following is dimensionless?$? |
| A. | Angular velocity |
| B. | Fanning friction factor |
| C. | Specific volume |
| D. | None of these |
| Answer» C. Specific volume | |
| 696. |
The line of action of the buoyant force acts through the$? |
| 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 | |
| 697. |
Which of the following can be used to create a flow of gas, where no significant compression is required?$? |
| A. | Reciprocating compressor |
| B. | Blower |
| C. | Axial flow compressor |
| D. | Centrifugal compressor |
| Answer» C. Axial flow compressor | |
| 698. |
Erosion and pits formation on the impeller of a centrifugal pump may be due to$? |
| A. | Cavitation |
| B. | Low speed of impeller |
| C. | Its operation with delivery valve closed for considerable time after starting the pump |
| D. | Off centering of pump with motor |
| Answer» B. Low speed of impeller | |
| 699. |
Centrifugal pump is normally classified on the basis of the$? |
| A. | Rpm |
| B. | Type of casing |
| C. | Impeller blade angle |
| D. | Number of blades in impeller |
| Answer» C. Impeller blade angle | |
| 700. |
Upto what value of 'Mach number', a fluid may be considered as incompressible?$? |
| A. | 0.03 |
| B. | 0.3 |
| C. | 3 |
| D. | 10 |
| Answer» C. 3 | |