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.
| 1. |
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 m/s? The Fanning friction factor, is 0.0062. |
| A. | 10 m |
| B. | 11 m |
| C. | 12 m |
| D. | 20 m |
| Answer» C. 12 m | |
| 2. |
Hydraulic mean depth () for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at = 0.3 D, gives the condition for the maximum |
| A. | flow rate |
| B. | mean velocity |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» C. both 'a' & 'b' | |
| 3. |
The terminal velocity of a particle moving through a fluid varies as d. What is the value of n' for Newton's law regime ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 3 |
| Answer» B. 1 | |
| 4. |
A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ = 10 KPa, is shared between flat parallel plates separated by a distance of 10 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is |
| A. | 10 KPa |
| B. | 20 KPa |
| C. | 30 KPa |
| D. | 40 KPa |
| Answer» C. 30 KPa | |
| 5. |
For Laminar flow through a packed bed, the pressure drop is proportional to ( is the superficial liquid velocity and is the particle diameter) |
| A. | / |
| B. | / |
| C. | / |
| D. | / |
| Answer» B. / | |
| 6. |
Dimension of surface tension is(where, = force, = length) |
| A. | . |
| B. | . |
| Answer» B. . | |
| 7. |
Co-efficient of discharge () is defined as actual discharge/theoretical discharge and is equal to . ; where = Co-efficient of contraction and = co-efficient of velocity. of an orifice is usually about |
| A. | 0.42 |
| B. | 0.62 |
| C. | 0.82 |
| D. | 0.98 |
| Answer» C. 0.82 | |
| 8. |
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10m/s). |
| A. | 24000 |
| B. | 24 |
| C. | 0.24 |
| D. | 0.44 |
| Answer» E. | |
| 9. |
For the free settling of a spherical particle through a fluid, the slope of, C-log N , plot is |
| A. | 1 |
| B. | -1 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 10. |
Buckingham-π theorem states that in any physical problem including '' quantities having '' diamensions, the quantities can be arranged into __________ independent dimensionless parameters. |
| A. | - |
| B. | / |
| Answer» D. | |
| 11. |
The head loss in turbulent flow in pipe is proportional to(where, = velocity of fluid through the pipe) |
| A. | 1/ |
| B. | 1/ |
| Answer» B. 1/ | |
| 12. |
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 | |
| 13. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10 V + 10.94 x 10 V (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 14. |
The equation relating friction factor to Reynold number, f = 4 log (N/), is called the __________ equation. |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 15. |
Pressure drop for turbulent fluid flow through a circular pipe is given by |
| A. | 64/R |
| Answer» D. | |
| 16. |
If Blausius or Darcey friction factor is '' then the Fanning friction factor is equal to |
| A. | /4 |
| B. | 4 |
| C. | 2 |
| D. | /2 |
| Answer» B. 4 | |
| 17. |
Fanning equation is given by. It is applicable to __________ region flow. |
| A. | transition |
| B. | laminar |
| C. | turbulent |
| D. | both (b) and (c) |
| Answer» E. | |
| 18. |
Drag force on the float of a rotameter is(where = flow rate of the ) |
| A. | ∝ |
| B. | ∝ |
| C. | ∝ |
| D. | constant |
| Answer» E. | |
| 19. |
The equation given below is called the __________ . = 4.07 log () |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | none of these |
| Answer» C. Fanning equation | |
| 20. |
The terminal velocity of a particle moving through a fluid varies as d. The value of n is equal to __________ in Stoke's law regime. |
| A. | 1 |
| B. | 0.5 |
| C. | 2 |
| D. | 1.5 |
| Answer» D. 1.5 | |
| 21. |
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 | |
| 22. |
A bed consists of particles of density 2000 kg/m. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is |
| A. | 25.61 kPa |
| B. | 11.77 kPa |
| C. | 14.86 kPa |
| D. | 21.13 kPa |
| Answer» C. 14.86 kPa | |
| 23. |
A gas (density = 1.5 kg/m , viscosity = 2x 10 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/mand viscosity of 3 x 10kg/m.s flowing at 3 m/s will be |
| A. | 8400 Pa/m |
| B. | 12600 Pa/m |
| C. | 18900 Pa/m |
| D. | 16800 Pa/m |
| Answer» C. 18900 Pa/m | |
| 24. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity) |
| A. | 1/μ |
| B. | μ |
| C. | μ2 |
| D. | 1/μ2 |
| Answer» C. μ2 | |
| 25. |
For an unstable equilibrium of a floating body (where, = metacentre.) |
| A. | is above |
| B. | is below |
| C. | & |
| D. | coincide |
| E. | none of these |
| Answer» C. & | |
| 26. |
Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter '' |
| A. | 0.5 |
| B. | 2 |
| C. | 4 |
| Answer» C. 4 | |
| 27. |
The percentage slip in a reciprocating pump set is given by the % of (where, = actual discharge = theoretical discharge) |
| A. | / |
| B. | / |
| Answer» E. | |
| 28. |
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. |
| A. | P, Q and R |
| B. | P and R |
| C. | R and S |
| D. | P, Rand S |
| Answer» B. P and R | |
| 29. |
The energy equation, (E = internal energy/mass), is applicable to |
| A. | perfect gases only. |
| B. | isothermal flow of gases. |
| C. | adiabatic unsteady flow of gases. |
| D. | all compressible fluids. |
| Answer» E. | |
| 30. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, = absolute temperature ) |
| A. | 1/ |
| B. | 1/ |
| Answer» D. | |
| 31. |
Applying a pressure drop across a capillary results in a volumetric flow rate '' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is |
| A. | /2 |
| B. | /4 |
| C. | /8 |
| D. | /16 |
| Answer» E. | |
| 32. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where = molecular weight of the gas) |
| A. | 1/ |
| B. | 1/ |
| Answer» B. 1/ | |
| 33. |
A fluid element has a velocity V = -y . xi + 2yx . j. The motion at (x, y) = (l/, 1) is |
| A. | rotational and incompressible |
| B. | rotational and compressible |
| C. | irrotational and compressible |
| D. | irrotational and incompressible |
| Answer» C. irrotational and compressible | |
| 34. |
Friction factor for a hydraulically smooth pipe at N = 2100 is f. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N, will |
| A. | increase. |
| B. | decrease. |
| C. | remain unchanged. |
| D. | increase or decrease depending on the pipe material. |
| Answer» B. decrease. | |
| 35. |
A pressure head of 320 metres of water in meters of CCl (sp.gr = 1.6) will be |
| A. | 100 |
| B. | 200 |
| C. | 320 |
| D. | 160 |
| Answer» C. 320 | |
| 36. |
N. second/m 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. | |
| 37. |
is always __________ . |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | either more or less than |
| Answer» B. less than | |
| 38. |
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 | |
| 39. |
/ is called the __________ number. |
| A. | Brinkman |
| B. | Galileo |
| C. | Archimedes |
| D. | Euler |
| Answer» C. Archimedes | |
| 40. |
The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis". The centre of pressure of a rectangular surface (of width '') immersed vertically in a static mass of fluid is at a depth of(where, = depth of the liquid) |
| A. | 2 |
| B. | /3 |
| C. | 3 |
| D. | /4 |
| Answer» C. 3 | |
| 41. |
For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is |
| A. | 1 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 42. |
In power law, , then the fluid is |
| A. | Newtonian |
| B. | dilatant |
| C. | thixotropic |
| D. | rheopectic |
| Answer» B. dilatant | |
| 43. |
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. | |
| 44. |
Efficiency of power transmission (η) through a circular pipe is given by (h - h)/h, which has a maximum value of __________ percent. |
| A. | 33:3 |
| B. | 50 |
| C. | 66.6 |
| D. | 88.8 |
| Answer» D. 88.8 | |
| 45. |
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary. |
| A. | I, II, III |
| B. | II, III, V |
| C. | I, II, V |
| D. | II, IV, V |
| Answer» C. I, II, V | |
| 46. |
A pressure of 10 m head of water is equivalent to __________ kN/m. |
| A. | 98 |
| B. | 147 |
| C. | 196 |
| D. | 49 |
| Answer» B. 147 | |
| 47. |
During fluid flow, variation of shear stress(τ) 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 | |
| 48. |
For a given Reynold number as / for an orifice increases, will (where, & are orifice & pipe diameters respectively). |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | either (a) or (b); depends on other factors |
| Answer» B. decrease | |
| 49. |
For pipe flows, head is proportional to __________ at constant capacity(where, = pipe diameter). |
| A. | 1/ |
| B. | 1/ |
| C. | 1/ |
| Answer» D. | |
| 50. |
A free jet of water of cross-sectional area 0.01m and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is |
| A. | 200 N |
| B. | 400 N |
| C. | 2000 N |
| D. | 4000 N |
| Answer» E. | |