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Home » Engineering » Chemical Engineering » Aptitude Test - 26
1.Purpose of relief valve in a reciprocating pump is to_________?
A. Control the rate of discharge
B. Reduce the discharge pressure
C. Facilitate unidirectional flow of liquid
D. Control the rate of discharge
2.What is the maximum theoretical suction lift (metres) of a reciprocating pump ?
A. 5
B. 10
C. 50
D. 5
3.Which of the following facilitates close control of flow of fluids ?
A. Gate valve
B. Globe valve
C. Butterfly valve
D. Gate valve
4.Lower BWG means _____________ of the tube?
A. Lower thickness
B. Lower cross-section
C. Outer diameter
D. Lower thickness
5.Pressure drop (?p) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as__?
A. V1.8
B. V-0.2
C. V2.7
D. V1.8
6.Transition length for a turbulent fluid entering into a pipe is around _______ times the pipe diameter?
A. 5
B. 50
C. 500
D. 5
7.The boundary layer thickness at a given section along a flat plate ________ with increasing Reynold�s number?
A. Increases
B. Decreases
C. Remain same
D. Increases
8.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. Shear stress
9.In continuous fluidisation__?
A. Solids are completely entrained
B. There is no entrainment of solids
C. Velocity of the fluid is very small
D. Solids are completely entrained
10.In a free vortex, the_?
A. Stream lines are not circular
B. Radial component of velocity is same everywhere
C. Flow is necessarily rotational
D. Stream lines are not circular
11.Fluid flow through a packed bed is represented by the _____ equation?
A. Fanning�s
B. Ergun�s
C. Hagen-Poiseuille�s
D. Fanning�s
12.Air vessel of a reciprocating pump is initially filled with__?
A. Atmospheric air
B. Water
C. Compressed air
D. Atmospheric air
13.A pressure of 10 m head of water is equivalent to ______________ kN/m2?
A. 98
B. 147
C. 196
D. 98
14.The maximum discharge through a circular channel takes place, when the depth of the fluid flow is _____ times the pipe diameter?
A. 0.25
B. 0.5
C. 0.66
D. 0.25
15.Air vessel fitted to a reciprocating pump__?
A. Increases the work done
B. Decreases the work done
C. Causes cavitation
D. Increases the work done
16.Pressure drop in packed bed for turbulent flow is given by the _____ equation?
A. Kozeny-Carman
B. Blake-Plummer
C. Leva�s
D. Kozeny-Carman
17.The _____ pressure is measured by a static tube?
A. Dynamic
B. Static
C. Static
D. Dynamic
18.Pascal law is not applicable for a/an ______fluid?
A. Accelerating frictionless
B. Static
C. Total
D. Accelerating frictionless
19.Pascal law is not applicable for a/an _________ fluid?
A. Accelerating frictionless
B. Uniformly moving
C. Static
D. Accelerating frictionless
20._____________ pump is the most suitable device for discharging a liquid against a pressure of ? 1500 kgf/cm2?
A. Centrifugal
B. Piston
C. Plunger
D. Centrifugal
21.In a/an _____________, the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure?
A. Rotameter
B. Venturimeter
C. Pitot tube
D. Rotameter
22.The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of ____ fluid?
A. Dilatent
B. Pseudo-plastic
C. Bingham plastic
D. Dilatent
23.Bernoulli�s equation is not applicable, when the flow is___?
A. Irrotational
B. Incompressible
C. Viscous
D. Irrotational
24.Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _______ the gas discharge pressure?
A. Increase
B. Decrease
C. Not change
D. Increase
25.Newton�s law of viscosity relates the______?
A. Shear stress and velocity
B. Velocity gradient and pressure intensity
C. Pressure gradient and rate of angular deformation
D. Shear stress and velocity
26.Which is the most efficient and best for measuring very small flow rate of gases ?
A. Venturimeter
B. Orificemeter
C. Rotameter
D. Venturimeter
27.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. d2
C. d4
D. d
28.For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance �d� measured from the centre line of the pipe, and it follows a ____ relationship?
A. Logarithmic
B. Parabolic
C. Hyperbolic
D. Logarithmic
29.What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter �D� & length �L� incurring a pressure drop �?p� with average velocity �Vavg� ?
A. D ?p/8L
B. D ?p/4L
C. 8 Vavg/D
D. D ?p/8L
30.For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ____?
A. 0.5
B. 1
C. 0.66
D. 0.5
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