MCQOPTIONS
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MCQOPTIONS
This section includes 659 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
During ageing of fluid carrying pipes, the__________________? |
| A. | Pipe becomes smoother with use |
| B. | Friction factor increases linearly with time |
| C. | Absolute roughness decreases with time |
| D. | Absolute roughness increases linearly with time |
| Answer» E. | |
| 502. |
Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump? |
| A. | Single stage vertical |
| B. | Centrifugal |
| C. | Plunger |
| D. | Diffuser |
| Answer» B. Centrifugal | |
| 503. |
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 the flow direction |
| C. | The component being normal to the flow direction |
| D. | None of these |
| Answer» C. The component being normal to the flow direction | |
| 504. |
Drag is defined as the force exerted by the___________________? |
| A. | Fluid on the solid in a direction opposite to flow |
| B. | Fluid on the solid in the direction of flow |
| C. | Solid on the fluid |
| D. | None of these |
| Answer» C. Solid on the fluid | |
| 505. |
Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________? |
| A. | ∝ Q |
| B. | ∝ √Q |
| C. | ∝ Q2 |
| D. | Constant |
| Answer» E. | |
| 506. |
Drag force acting on a body does not depend upon the____________________? |
| A. | Density of the fluid |
| B. | Density of the body |
| C. | Velocity of the body |
| D. | Projected area of the body |
| Answer» C. Velocity of the body | |
| 507. |
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. | |
| 508. |
Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is_________________? |
| A. | 24/NRe,P |
| B. | 16/NRe,P |
| C. | 64/NRe,P |
| D. | 48/NRe, |
| Answer» B. 16/NRe,P | |
| 509. |
Drag co-efficient for flow past immersed body is the ratio of _____________ to the product of velocity head and density? |
| A. | Shear stress |
| B. | Shear force |
| C. | Average drag per unit projected area |
| D. | None of these |
| Answer» D. None of these | |
| 510. |
Drag co-efficient CD, in Stoke’s law range is given by________________? |
| A. | CD = 16/Re.p |
| B. | CD = 24/Re.p |
| C. | CD = 18.4/Re.p |
| D. | CD = 0.079/Re 0.25.p |
| Answer» C. CD = 18.4/Re.p | |
| 511. |
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 | |
| 512. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be _____________ ft3/sec? |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 513. |
Disc compensators are provided in large diameter fuel gas carrying pipelines to_________________? |
| A. | Keep the pipe in proper orientation |
| B. | Make the pipe joint leak-proof |
| C. | Account for contraction/expansion of pipe due to temperature changes of the surroundings |
| D. | Account for the pressure variation side the pipeline |
| Answer» D. Account for the pressure variation side the pipeline | |
| 514. |
Dimension of kinematic viscosity is_____________________? |
| A. | MLT-1 |
| B. | L2T-1 |
| C. | L2T |
| D. | L2T-2 |
| Answer» C. L2T | |
| 515. |
Dimension of surface tension is (where, F = force, L = length) ? |
| A. | FL-1 |
| B. | F-1. L |
| C. | F.L-2 |
| D. | F-2. L |
| Answer» B. F-1. L | |
| 516. |
Dimension of absolute viscosity is_________________? |
| A. | ML-1T-1 |
| B. | MLT-1 |
| C. | ML-1T |
| D. | MLT |
| Answer» B. MLT-1 | |
| 517. |
Differential manometer measures the___________________? |
| A. | Absolute pressure |
| B. | Gauge pressure |
| C. | Pressure difference |
| D. | Pressure gradient |
| Answer» D. Pressure gradient | |
| 518. |
Differential manometer measures the____________________? |
| A. | Atmospheric pressure |
| B. | Sub-atmospheric pressure |
| C. | Pressure difference between two points |
| D. | None of these |
| Answer» D. None of these | |
| 519. |
Diaphragm valves are used for handling _______________ fluids? |
| A. | Corrosive |
| B. | Viscous |
| C. | Non-Newtonian |
| D. | Solid suspended |
| Answer» B. Viscous | |
| 520. |
Diaphragm pumps are used to transport_________________? |
| A. | Solids |
| B. | Liquids |
| C. | Fluids |
| D. | Slurries |
| Answer» E. | |
| 521. |
Design of the casing of centrifugal pump should be such as to minimise the________________? |
| A. | Back flow through impeller |
| B. | Loss of kinetic head |
| C. | Loss of static head |
| D. | None of these |
| Answer» C. Loss of static head | |
| 522. |
Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________? |
| A. | Occurs when NRe is very small |
| B. | Is primarily a friction drag |
| C. | Is independent of body length |
| D. | Depends mainly on cross-sectional shape |
| Answer» B. Is primarily a friction drag | |
| 523. |
Dean number is concerned with the____________________? |
| A. | Fluid-particle interaction |
| B. | Fluid flow through helical pipes |
| C. | Power consumption in agitated vessels |
| D. | Psychrometry |
| Answer» C. Power consumption in agitated vessels | |
| 524. |
Curve III in the bellow diagram represents a/an________________? |
| A. | Dilatent fluid |
| B. | Pseudo plastic fluid |
| C. | Ideal plastic |
| D. | None of these |
| Answer» C. Ideal plastic | |
| 525. |
Critical velocity in a pipe flow_________________? |
| A. | Increases as fluid viscosity increases |
| B. | Increases as pipe diameter increases |
| C. | Independent of fluid density |
| D. | None of these |
| Answer» C. Independent of fluid density | |
| 526. |
Creeping flow around a sphere is defined, when particle Reynolds number is___________________? |
| A. | < 2100 |
| B. | < 0.1 |
| C. | > 2.5 |
| D. | < 500 |
| Answer» C. > 2.5 | |
| 527. |
Cp/Cv is termed as__________________? |
| A. | Adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 528. |
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm? |
| A. | 4 |
| B. | > 12.5 |
| C. | < 10 |
| Answer» C. < 10 | |
| 529. |
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ? |
| A. | f1 = f2 |
| B. | f1 < f2 |
| C. | f1 > f2 |
| D. | Data not sufficient to relate f1 & f2 |
| Answer» D. Data not sufficient to relate f1 & f2 | |
| 530. |
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. | |
| 531. |
Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(ε/D) + (1.26/NRe √F). It reduces to Nikuradse equation for a value of (ϵ/D) equal to __________________? |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | 0.5 |
| Answer» C. ∞ | |
| 532. |
Cocks are used to control ___________________? |
| A. | Water |
| B. | Any liquid |
| C. | Solids |
| D. | None of these |
| Answer» C. Solids | |
| 533. |
Co-efficient of velocity is ___________________ the coefficient of discharge? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Not related to |
| Answer» C. Equal to | |
| 534. |
Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________? |
| A. | 0.42 |
| B. | 0.62 |
| C. | 0.82 |
| D. | 0.98 |
| Answer» C. 0.82 | |
| 535. |
Choose the set of pressure intensities that are equivalent ? |
| A. | 4.33 psi, 10 ft. of water, 8.83 inches of Hg |
| B. | 4.33 psi, 10 ft. of water, 20.7 inches of Hg |
| C. | 10 psi, 19.7 ft. of water, 23.3 inches of Hg |
| D. | 10 psi, 19.7 ft. of water, 5.3 inches of Hg |
| Answer» B. 4.33 psi, 10 ft. of water, 20.7 inches of Hg | |
| 536. |
Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ? |
| A. | FL-2T, ML-1T-1 |
| B. | FLT, ML-1T-1 |
| C. | ML-1T-3, F-1L2T |
| D. | F-1L2T-1, MLT-3 |
| Answer» B. FLT, ML-1T-1 | |
| 537. |
Choking in case of pipe flow means that a___________________? |
| A. | Specified mass flow rate cannot be achieved |
| B. | Valve is closed in the line |
| C. | Restriction in flow cross-section area occurs |
| D. | None of these |
| Answer» B. Valve is closed in the line | |
| 538. |
Check valves are used_______________? |
| A. | At high pressure |
| B. | In bends |
| C. | For controlling water flow |
| D. | For unidirectional flow |
| Answer» E. | |
| 539. |
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________? |
| A. | Back flow of fluid in the event of stoppage of pump |
| B. | Discharge pressure |
| C. | Flow of liquid during operation of the pump |
| D. | All A., B. and C. |
| Answer» B. Discharge pressure | |
| 540. |
Check valve is used for ________________ flow? |
| A. | Very precise control of |
| B. | Unidirectional |
| C. | Multidirectional |
| D. | None of these |
| Answer» C. Multidirectional | |
| 541. |
Check in a centrifugal pump is________________? |
| A. | Provided in the discharge line |
| B. | Generally a globe valve |
| C. | Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running |
| D. | All A., B. and C. |
| Answer» E. | |
| 542. |
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 | |
| 543. |
Centrifugal pumps as compared to reciprocating pumps__________________? |
| A. | Run at a lower speed for the same discharge |
| B. | Do not need priming |
| C. | Deliver fluid with pulsating/fluctuating discharge |
| D. | Can be run with discharge line valve closed for a short interval |
| Answer» E. | |
| 544. |
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 | |
| 545. |
Centrifugal pump can’t be used to pump _____________________? |
| A. | Molten sodium (used as a coolant in Fast Breeder Reactor) |
| B. | Moderately viscous vegetable oil used in soap industry |
| C. | Thick molten soap at 80°C |
| D. | None of the above |
| Answer» D. None of the above | |
| 546. |
Centrifugal compressors compared to reciprocating compressors__________________? |
| A. | Require less space |
| B. | Have quieter operation |
| C. | Have lower operating costs |
| D. | All A., B. and C. |
| Answer» E. | |
| 547. |
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 | |
| 548. |
Centre of pressure in an immersed body is ______________ the centre of gravity? |
| A. | Above |
| B. | Below |
| C. | At |
| D. | Either above or below; depends on the liquid density |
| Answer» C. At | |
| 549. |
Cd is always ______________ Cc? |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Either more or less than |
| Answer» B. Less than | |
| 550. |
Cd for the orifice plate varies from ___________________? |
| A. | 0.58 to 0.8 |
| B. | 0.93 to 0.98 |
| C. | 0.2 to 0.3 |
| D. | 0.02 to 0.03 |
| Answer» B. 0.93 to 0.98 | |