Chemical Engineering MCQs

6108 MCQs  (Page 389 of 611)

Attempt Chemical Engineering Quiz
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,p
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In power law, δ = [A (du/dy)2 + B] then the fluid is__________________?
A. Newtonian
B. Dilatant
C. Thixotropic
D. Rheopectic
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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 × 103 VOM + 10.94 × 106 V2 OM (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
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A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?
A. 39.6y
B. 48y
C. 49.2y
D. 58y
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What is the unit of kinematic viscosity in SI unit ?
A. M2/sec
B. N/m2. sec
C. Kg. sec/m
D. None of these
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Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the_______________?
A. Drag on particles
B. Drag on column walls
C. Bed height
D. Bed voidage
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The main factor on which the behaviour of a mass of fluidised solid depends mainly is the___________________?
A. Fluid characteristics
B. Particle size
C. Both a. and b.
D. Neither a. nor b.
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Curve III in the bellow diagram represents a/an________________?
A. Dilatent fluid
B. Pseudo plastic fluid
C. Ideal plastic
D. None of these
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The capacity of a centrifugal pump Can be increased by increasing the_________________?
A. Impeller diameter or speed
B. Number of pumps and joining them in series
C. Number of pumps and joining them in parallel
D. All a., b. and c.
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The unit of velocity head is_________________?
A. Ft-lb/sec
B. Ft-lb/ft3
C. Ft-lbf/lb
D. Ft-lbf/sec
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Word of the Day
26 Jul
Simultaneously
at the same time.
ایک ہی وقت میں، ایک ساتھ، بیک وقت

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