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WorksheetsModel exam IV_OCH751_PMS_PART A
Total questions: 30
Worksheet time: 15mins
When do we go for designing a empirical model....
The underlying phenomena are not well understood
When the numerical solution of the fundamental model is quite difficult.
When the empirical model provides satisfactory predictions of the process characteristics.
All the above
When the variables of a process vary with both spatial position and time, such a process is referred to a
Distributed parameter system.
Lumped parameter system
Linear model
fundamental model
Molecular weight is the ratio of _______ and ________
a) Mass, Mole
b) Mole, Mass
c) Mole, Mole
d) Mass, Mass
A process is said to be------------ if its output becomes larger and larger (either positively or negatively) as time increases.
Unstable
marginally stable
stable
Asymptotic stable
If a reaction occurs inside a system, the number of moles of an individual component will--------- if it is a product of the reaction or ----------- if it is a reactant.
Decrease, Increase
Increase, Decrease
Increase, slightly decrease
From the derivations we have seen for a macroscopic CSTR system what is the unit of rate of reaction?
m/s
s-1
kg/mol/s
Kg/m3/s
What is the formula to calculate Degree of Freedom?
nindep_eqns = nunknowns – -ndf
ndof = nunknowns – nindep_eqns
None of the above
2x+y=7, x+3y=11 Calculate DoF for the equations
0
1
2
None of the above
Calculate the number of unknowns in the given picture?
4
5
6
1
Flow sheeting can be analysed in three ways. Sequential modular, Equation oriented approach and simultaneous modular approach.
True
False
The Iterative formula for Newton Raphson method is given by __________
a) x1 = x0-f(x0)/f’(x0)
b) x0 = x1-f(x0)/f‘(x0)
c) x0 = x1+f(x0)/f’(x0)
d) x1 = x0+f(x0)/f‘(x0)
The Bisection method has which of the following convergences?
a) Linear
b) Quadratic
c) Cubic
d) Quaternary
Identify the wrong statement
a) The process of heat transfer is an irreversible process
b) For heat exchange, a temperature gradient must exist
c) A material medium is not necessary for heat transmission
d) Heat flow doesn’t depend on temperature
Flash vaporization is a
a) Equilibrium distillation
b) Differential distillation
c) Simple distillation
d) None of the mentioned
Find the X and Y from the flash column given below
a) X-more volatile, Y-less volatile
b) X-less volatile, Y- more volatile
c) X-non volatile, Y-less volatile
d) X-non volatile, Y-more volatile
When the boiling temperature is plotted against the liquid composition, then it is called
a) Cooling Curve
b) Heating Curve
c) Bubble point curve
d) Volatility Phase Diagram
Identify the component continuity equation for condenser and reflux drum.
If the flow is turbulent, the frictional force will be -----------proportional to ------------ of the velocity and length of the pipe.
Directly,Square
Inversely , squareroot
Directly,Squareroot
Inversely , Square
When a fluid moves at speeds comparable to its speed of
sound, density changes become significant and the flow is
termed ---------------
Compressible
Incompressible
Laminar
For subsonic flows, the Ma number is in the range of
0.3 < Ma < 0.8
0.8 < Ma < 1.2
1.2 < Ma < 3.0
The rate of propagation of a pressure pulse of infinitesimal strength through a still fluid is called as ----------
speed of fluid
speed of sound
speed of incompressible fluid
The packing Height Z in a packed column is calculated using the formula,
height of transfer unit (HTU) *number of transfer units (n)
Number of Transfer units * packed columns
None of the above
Some examples of heat exchanger are
(i) Condensers and evaporators in refrigeration units
(ii) Evaporator of an ice plant and milk chiller of a pasteurizing plant
(iii) Automobile radiators and oil coolers of heat engines
Identify the correct answer
a) i only
b) ii and iii
c) i, ii and iii
d) i and ii
A -------------------------- has separate flow paths for each fluid and fluids flow simultaneously through the exchanger exchanging heat across the wall separating the flow paths.
Recuperative Heat Exchanger
Regenerative Heat Exchanger
Direct Contact heat exchanger
The frictional resistance for fluids in motion is
a) proportional to the velocity in laminar flow and to the square of the velocity in turbulent flow
b) proportional to the square of the velocity in laminar flow and to the velocity in turbulent flow
c) proportional to the velocity in both laminar flow and turbulent flow
d) proportional to the square of the velocity in both laminar flow and turbulent flow
A small shear force is applied on an element and then removed. If the element regains it’s original position, what kind of an element can it be?
a) Solid
b) Liquid
c) Fluid
d) Gaseous
Sedimentation is a process using gravity to remove suspended solids from water.
a) True
b) False
--------------------of a settling tank may be defined as average theoretical time required for the water to flow through the tank length.
Detention period
overflow rate
kinematic viscosity
The disturbance in fluid flow in boundary layer is amplified and the flow become unstable and the fluid flow undergoes transition from laminar to turbulent flow. This regime is called -------------------- regime.
Critical
Transition
Turbulence
The shear force acting on a pipe is a function of ---------------- and ------ of the object
surface area, length
radius, pressure
force, radius
