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.
| 51. |
C/C is termed as |
| A. | adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 52. |
For a stable equilibrium of a submerged body (where, and are centres of gravity & buoyancy respectively). |
| A. | is above |
| B. | is above |
| C. | & |
| D. | coincide |
| E. | none of these |
| Answer» C. & | |
| 53. |
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 power consumed now will be __________ hp. |
| A. | 0.5 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» B. 2 | |
| 54. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft/sec. |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 55. |
__________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm. |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 56. |
For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as |
| A. | d |
| B. | d |
| C. | d |
| Answer» E. | |
| 57. |
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ? |
| A. | 0.61 - 0.63 |
| B. | 0.5 - 0.75 |
| C. | 0.75 - 0.90 |
| D. | 0.35 - 0.55 |
| Answer» B. 0.5 - 0.75 | |
| 58. |
Bed pressure drop in an air fluidised bed of catalyst particles (ρ = 200 kg/m3, D = 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 | |
| 59. |
What is the value of Fanning friction factor f ' for smooth pipe at N = 10 approximately ? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 60. |
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 | |
| 61. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm. |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 62. |
A fluidis moving at critical flow condition (N = 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 | |
| 63. |
Capillary rise of mercury in a small diameter tube is proportional to (where, = diameter of the tube, σ = surface tension of mercury) |
| A. | 1/ |
| B. | σ |
| C. | l/σ |
| Answer» D. | |
| 64. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m ) is to be fluidised by water (density 1000 kg/m ). 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 | |
| 65. |
Fanning friction factor is equal to(where, = Blassius friction factor). |
| A. | /4 |
| B. | /2 |
| C. | 4 |
| D. | 2 |
| Answer» B. /2 | |
| 66. |
f = 16/N, is valid for |
| A. | turbulent flow |
| B. | laminar flow through an open channel |
| C. | steady flow |
| D. | none of these |
| Answer» E. | |
| 67. |
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. ∞ | |
| 68. |
Stoke's law is valid, when N is less than |
| A. | 2 |
| B. | 100 |
| C. | 2100 |
| D. | 700 |
| Answer» B. 100 | |
| 69. |
Each term of the Bernoulli's equation written in the form, , represents the total energy per unit |
| A. | mass |
| B. | volume |
| C. | specific weight |
| D. | none of these |
| Answer» B. volume | |
| 70. |
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, the minimum fluidisation velocity, V is |
| A. | 12 mm/s |
| B. | 16 mm/s |
| C. | 24 mm/s |
| D. | 28 mm/s |
| Answer» C. 24 mm/s | |
| 71. |
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, = average fluid velocity) |
| A. | 1.2 |
| B. | 1.5 |
| C. | 1.8 |
| Answer» C. 1.8 | |
| 72. |
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, μ = fluid viscosity ) |
| A. | μ |
| B. | 1/μ |
| C. | 1/ |
| Answer» C. 1/ | |
| 73. |
U is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U to 2.5 U 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 | |
| 74. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is |
| A. | .4 KPa |
| B. | .94 KPa |
| C. | .7 KPa |
| D. | one of these |
| Answer» B. .94 KPa | |
| 75. |
Enamels and paints are generally __________ fluid. |
| A. | eheopectic |
| B. | seudo-plastic |
| C. | hixotropic |
| D. | ilatant |
| Answer» C. hixotropic | |
| 76. |
Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible? |
| A. | 0.3 |
| B. | 3 |
| C. | 0 |
| Answer» B. 3 | |
| 77. |
Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number? |
| A. | anning equation |
| B. | lake-Pllummer equation |
| C. | agen-Poiseulle equation |
| D. | ozney-Karman equation |
| Answer» C. agen-Poiseulle equation | |
| 78. |
Which of the following conditions must be satisfied for lift force to be developed? |
| A. | he body should be bluff body |
| B. | he body should be stream lined |
| C. | irculation around the body is essentially required |
| D. | he main stream velocity must approach the velocity of sound in that fluid medium |
| Answer» D. he main stream velocity must approach the velocity of sound in that fluid medium | |
| 79. |
Viscosity of water at 40°C lies in the range of |
| A. | x 10⁻³ to 2 x 10⁻³ kg/m.s |
| B. | .5 x 10⁻³ to 1 x 10⁻³ kg/m.s |
| C. | to 2 kg/m.s |
| D. | .5 to 1 kg/m.s |
| Answer» C. to 2 kg/m.s | |
| 80. |
A pressure of 10 m head of water is equivalent to __________ kN/m². |
| A. | 8 |
| B. | 47 |
| C. | 96 |
| D. | 9 |
| Answer» B. 47 | |
| 81. |
Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) |
| A. | = 1840 H0.5/N |
| B. | = 1840 N/H0.5 |
| C. | = 1840 D0.5/N |
| D. | = 1840 H/N |
| Answer» B. = 1840 N/H0.5 | |
| 82. |
A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation? |
| A. | nertial and drag forces are important |
| B. | rag, gravitational and buoyancy forces are impportant |
| C. | rag force and gravitational forces are important |
| D. | one of the above |
| Answer» C. rag force and gravitational forces are important | |
| 83. |
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 10³ VOM + 10.94 x 10⁶ V²OM (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 | |
| 84. |
For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by |
| A. | u/∂x = 0 |
| B. | (ρu)/∂x = 0 |
| C. | u/∂x = - ∂ρ/∂t |
| D. | ρ/∂t = 0 |
| Answer» B. (ρu)/∂x = 0 | |
| 85. |
Which of the following denotes the effect of compressibility in fluid flow? |
| A. | eber number |
| B. | ach number |
| C. | uler number |
| D. | eynolds number |
| Answer» C. uler number | |
| 86. |
Centrifugal pumps as compared to reciprocating pumps |
| A. | un at a lower speed for the same discharge |
| B. | o not need priming |
| C. | eliver fluid with pulsating/fluctuating discharge |
| D. | an be run with discharge line valve closed for a short interval |
| Answer» E. | |
| 87. |
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic? |
| A. | ewage sludge |
| B. | ubber latex |
| C. | lood |
| D. | ugar solution |
| Answer» B. ubber latex | |
| 88. |
Which of the following is used for pumping crude oil from oil well? |
| A. | ingle stage centrifugal pump |
| B. | ear pump |
| C. | crew pump |
| D. | uplex/triplex reciprocating pump |
| Answer» E. | |
| 89. |
Which of the following is an undesirable property of a manometric liquid? |
| A. | on-sticky & non-corrosive nature |
| B. | igh vapour pressure |
| C. | ow viscosity & surface tension |
| D. | ow co-efficient of thermal expansion |
| Answer» C. ow viscosity & surface tension | |
| 90. |
Specific speed for a centrifugal pump is |
| A. | √Q/H3/4 |
| B. | √Q/H2/3 |
| C. | √Q/H1/4 |
| D. | √Q/H |
| Answer» B. √Q/H2/3 | |
| 91. |
In which of the following cases, it is possible for flow to occur from low pressure to high pressure? |
| A. | low of liquid upward in a vertical pipe |
| B. | low through a converging section |
| C. | low of air downward in a pipe |
| D. | mpossible in a constant cross-section conduit |
| Answer» C. low of air downward in a pipe | |
| 92. |
Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss? |
| A. | low nozzle |
| B. | enturimeter |
| C. | otameter |
| D. | rificemeter |
| Answer» C. otameter | |
| 93. |
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)? |
| A. | .61 - 0.63 |
| B. | .5 - 0.75 |
| C. | .75 - 0.90 |
| D. | .35 - 0.55 |
| Answer» B. .5 - 0.75 | |
| 94. |
A fluid element has a velocity V = -y² . xi + 2yx² . j. The motion at (x, y) = (l/√2, 1) is |
| A. | otational and incompressible |
| B. | otational and compressible |
| C. | rrotational and compressible |
| D. | rrotational and incompressible |
| Answer» C. rrotational and compressible | |
| 95. |
The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by |
| A. | xy/(x+y) |
| B. | y/(x+y) |
| C. | x+y)/2xy |
| D. | x+y)/xy |
| Answer» B. y/(x+y) | |
| 96. |
If Blausius or Darcey friction factor is 'f₁' then the Fanning friction factor is equal to |
| A. | ₁/4 |
| B. | F₂ |
| C. | f₁ |
| D. | ₁/2 |
| Answer» B. F₂ | |
| 97. |
What is the unit of kinematic viscosity in SI unit? |
| A. | ²/sec |
| B. | /m² . sec |
| C. | g . sec/m |
| D. | one of these |
| Answer» B. /m² . sec | |
| 98. |
Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent. |
| A. | 3:3 |
| B. | 0 |
| C. | 6.6 |
| D. | 8.8 |
| Answer» D. 8.8 | |
| 99. |
Which of the following can be used for the direct measurement of volumetric flow rate of slurry? |
| A. | enturimeter |
| B. | rificemeter |
| C. | otameter |
| D. | itot tube |
| Answer» D. itot tube | |
| 100. |
At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump? |
| A. | 0° and 140° |
| B. | 5° and 60° |
| C. | 0° and 80° |
| D. | 0° and 120° |
| Answer» B. 5° and 60° | |