MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 74 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. |
The total pressure on a plane surface inclined at an angle 9 with the horizontal is |
| A. | pA sin 9 |
| B. | PA |
| C. | pA tan 9 |
| D. | pA cos 9 |
| Answer» D. pA cos 9 | |
| 2. |
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be |
| A. | 10 kN/m2 |
| B. | 4 kN/m2 |
| C. | 14 kN/m2 |
| D. | 12 kN/m2 |
| Answer» D. 12 kN/m2 | |
| 3. |
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is |
| A. | one-fourth its value when cylinder was full |
| B. | zero |
| C. | cannot be predicted from the given data |
| D. | one-half its value when cylinder was full |
| Answer» C. cannot be predicted from the given data | |
| 4. |
Centre of buoyancy always |
| A. | coincides with the centroid of the volume of fluid displaced |
| B. | coincides with the centre of gravity |
| C. | remains below the centre of gravity |
| D. | remains above the centre of gravity |
| Answer» B. coincides with the centre of gravity | |
| 5. |
Metacentric height for small values of angle of heel is the distance between the |
| A. | centre of gravity and metacentre |
| B. | centre of gravity and centre of buoy-ancy |
| C. | free surface and centre of buoyancy |
| D. | centre of buoyancy and metacentre |
| Answer» B. centre of gravity and centre of buoy-ancy | |
| 6. |
Hydraulic mean depth (Dm) for a circular pipe of diameter \'D\' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum |
| A. | mean velocity |
| B. | flow rate |
| C. | neither 'a' nor 'b' |
| D. | both 'a' & 'b' |
| Answer» B. flow rate | |
| 7. |
The Stoke\'s stream function applies to the |
| A. | ideal/non-viscous fluids only. |
| B. | irrotational flow only. |
| C. | none of these |
| D. | cases of axial symmetry |
| Answer» E. | |
| 8. |
Pascal-second is the unit of |
| A. | kinematic viscosity |
| B. | pressure |
| C. | surface tension |
| D. | dynamic viscosity |
| Answer» E. | |
| 9. |
For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to(where, ? = fluid viscosity ) |
| A. | ? |
| B. | 1/? |
| C. | ? |
| D. | 1/ ? |
| Answer» C. ? | |
| 10. |
U mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U mf to 2.5 U mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the |
| A. | drag on particles |
| B. | drag on coloumn walls |
| C. | bed height |
| D. | bed voidage |
| Answer» D. bed voidage | |
| 11. |
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, V avg = average fluid velocity) |
| A. | V avg |
| B. | 1.2 V avg |
| C. | 1.5 V avg |
| D. | 1.8 V avg |
| Answer» C. 1.5 V avg | |
| 12. |
f = 16/N Re , is valid for |
| A. | turbulent flow |
| B. | laminar flow through an open channel |
| C. | steady flow |
| D. | none of these |
| Answer» E. | |
| 13. |
Fanning friction factor is equal to(where, f B = Blassius friction factor). |
| A. | f B /4 |
| B. | f B /2 |
| C. | 4 f B |
| D. | 2 f B |
| Answer» B. f B /2 | |
| 14. |
Colebrook equation for friction factor in turbulent flow is given by, . It reduces to Nikuradse equation for a value of equal to |
| A. | 0 |
| B. | 1 |
| C. | ? |
| D. | 0.5 |
| Answer» C. ? | |
| 15. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m 3 ) is to be fluidised by water (density 1000 kg/m 3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is |
| A. | 4.4 KPa |
| B. | 2.94 KPa |
| C. | 3.7 KPa |
| D. | none of these |
| Answer» B. 2.94 KPa | |
| 16. |
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ? = surface tension of mercury) |
| A. | d |
| B. | 1/ d |
| C. | ? |
| D. | l/? |
| Answer» D. l/? | |
| 17. |
A fluid is moving at critical flow condition (N Re = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec. |
| A. | 7 |
| B. | 700 |
| C. | 7000 |
| D. | 630 |
| Answer» B. 700 | |
| 18. |
In a fully turbulent flow ( Re > 10 5 ) in a pipe of diameter ' d ', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is |
| A. | d |
| B. | d 2 |
| C. | d 2.5 |
| D. | d 4 |
| Answer» D. d 4 | |
| 19. |
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (? 0 ) with age/time (t) (where, ? = roughness of the surface after time' t '. ? = a co-efficient to be experimentally determined)? |
| A. | ? = ? 0 + ?. t |
| B. | ? = ? 0 + ?. t 2 |
| C. | ? = ? 0 + ?. t 3 |
| D. | ? = ? 0 + ?. t 4 |
| Answer» B. ? = ? 0 + ?. t 2 | |
| 20. |
Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, D f = Drag force on the float B f = Buoyant force on the float W f = Weight of the float) |
| A. | D f + B f = W f |
| B. | D f = B f + W f |
| C. | D f + B f + W f =0 |
| D. | none of these |
| Answer» B. D f = B f + W f | |
| 21. |
A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ?L. |
| A. | ?L . V g |
| B. | ?L . A.H g |
| C. | ?L . V g /2 |
| D. | ?L .V g /3 |
| Answer» C. ?L . V g /2 | |
| 22. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft 3 /sec. |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 23. |
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be __________ hp. |
| A. | 0.5 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» B. 2 | |
| 24. |
Stoke's law is valid, when N Re, p is less than |
| A. | 2 |
| B. | 100 |
| C. | 2100 |
| D. | 700 |
| Answer» B. 100 | |
| 25. |
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V = fluid velocity f = friction factor). |
| A. | Q = Q 1 + Q 2 + Q 3 |
| B. | V 1 = V 2 = V 3 |
| C. | Q 1 = Q 2 = Q 3 |
| D. | f = f1 + f 2 + f 3 |
| Answer» B. V 1 = V 2 = V 3 | |
| 26. |
C p /C v is termed as |
| A. | adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 27. |
A free jet of water of cross-sectional area 0.01m 2 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. | |
| 28. |
What is the value of Fanning friction factor f ' for smooth pipe at N Re = 10 6 approximately ? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 29. |
The hydraulic diameter of an annulus of inner and outer radii R i and R o respectively is |
| A. | 4(R o -R i ) |
| B. | R o -R i |
| C. | 2(R o -R i ) |
| D. | R o + R i |
| Answer» D. R o + R i | |
| 30. |
For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are |
| A. | h 1 > h 2 < h 3 |
| B. | h 1 > h 2 > h 3 |
| C. | h 2 < h 1 < h 3 |
| D. | h 1 < h 2 < h 3 |
| Answer» B. h 1 > h 2 > h 3 | |
| 31. |
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible. |
| A. | A, C, D |
| B. | B, D, E |
| C. | A, B, E |
| D. | A, D, E |
| Answer» D. A, D, E | |
| 32. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm 2 . |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 33. |
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 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 | |
| 34. |
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was ?p. For the same discharge, the pressure drop across globe valve is |
| A. | ?p |
| B. | < ?p |
| C. | > ?p |
| D. | ?p 2 |
| Answer» D. ?p 2 | |
| 35. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, ? = fluid viscosity) |
| A. | 1/? |
| B. | ? |
| C. | ?2 |
| D. | 1/?2 |
| Answer» C. ?2 | |
| 36. |
The equation given below is called the __________ . f -0.5 = 4.07 log e ( N Re f ) -0.6 |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | none of these |
| Answer» C. Fanning equation | |
| 37. |
The terminal velocity of a particle moving through a fluid varies as d p n . 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 | |
| 38. |
Co-efficient of discharge ( C d ) is defined as actual discharge/theoretical discharge and is equal to C c . C v ; where C c = Co-efficient of contraction and C v = co-efficient of velocity. C d of an orifice is usually about |
| A. | 0.42 |
| B. | 0.62 |
| C. | 0.82 |
| D. | 0.98 |
| Answer» C. 0.82 | |
| 39. |
The equation relating friction factor to Reynold number, f -0.5 = 4 log e (N Re / f ) -0.4 , is called the __________ equation. |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 40. |
A gas (density = 1.5 kg/m 3 , viscosity = 2x 10 -5 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/m 3 and viscosity of 3 x 10 -5 kg/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 | |
| 41. |
A bed consists of particles of density 2000 kg/m 3 . 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 | |
| 42. |
If Blausius or Darcey friction factor is ' f 1 ' then the Fanning friction factor is equal to |
| A. | f 1 /4 |
| B. | 4 f 2 |
| C. | 2 f 1 |
| D. | f 1 /2 |
| Answer» B. 4 f 2 | |
| 43. |
Fanning equation is given by . It is applicable to __________ region flow. |
| A. | transition |
| B. | laminar |
| C. | turbulent |
| D. | both (b) and (c) |
| Answer» E. | |
| 44. |
C d 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 | |
| 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. |
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f 1 and that for smooth pipe is f 2 . Pick out the correct statement. |
| A. | f 1 = f 2 |
| B. | f 1 < f 2 |
| C. | f 1 > f 2 |
| D. | data not sufficient to relate f 1 & f 2 |
| Answer» D. data not sufficient to relate f 1 & f 2 | |
| 47. |
N. second/m 2 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. | |
| 48. |
For the manometer set up shown in the figure, the pressure difference P A - P B is given by |
| A. | (?H - ? air )gH |
| B. | (?H - ?L)gH |
| C. | (?H - ?L) gH + (?L - ? air ) . g(L - H) |
| D. | (?H - ?L) gL + (?L - ? air )gH |
| Answer» B. (?H - ?L)gH | |
| 49. |
Friction factor for a hydraulically smooth pipe at N Re = 2100 is f 1 . If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N Re , will |
| A. | increase. |
| B. | decrease. |
| C. | remain unchanged. |
| D. | increase or decrease depending on the pipe material. |
| Answer» B. decrease. | |
| 50. |
For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be |
| A. | V 1 < V 2 < V 3 |
| B. | V 2 > V 1 and V 2 > V 3 |
| C. | V 1 > V 2 > V 3 |
| D. | none of these. |
| Answer» C. V 1 > V 2 > V 3 | |