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Q.No15 Carry One Mark Each
Q.
A student is required to demonstrate a high level of comprehension of the subject, especially
in the social sciences.
The word closest in meaning to comprehension is
Choose the most appropriate word from the options given below to complete the following
sentence.
One of his biggest ______ was his ability to forgive.
Rajan was not happy that Sajan decided to do the project on his own. On observing his unhappiness, Sajan explained to Rajan that he preferred to work independently. Which one of the statements below is logically valid and can be inferred from the above sentences?
If y = 5x^{2} + 3, then the tangent at x = 0, y = 3
A foundry has a fixed daily cost of Rs 50,000 whenever it operates and a variable cost of Rs
800Q, where Q is the daily production in tonnes. What is the cost of production in Rs per
tonne for a daily production of 100 tonnes?
Fixed cost = Rs. 50,000
Variable cost = Rs. 800Q
Q = daily production in tones
For 100 tonnes of production daily, total cost of production
= 50,000+800×100 = 130,000
So, cost of production per tonne of daily production = 130000/100 = Rs. 1300
Find the odd one in the following group: ALRVX, EPVZB, ITZDF, OYEIK
ALRVX→only one vowel
EPVZB→only one vowel
ITZDF→only one vowel
OYEIK→three vowels
Anuj, Bhola, Chandan, Dilip, Eswar and Faisal live on different floors in a sixstoreyed
building (the ground floor is numbered 1, the floor above it 2, and so on). Anuj lives on an
evennumbered floor. Bhola does not live on an odd numbered floor. Chandan does not live
on any of the floors below Faisal’s floor. Dilip does not live on floor number 2. Eswar does
not live on a floor immediately above or immediately below Bhola. Faisal lives three floors
above Dilip. Which of the following floorperson combinations is correct?
(a) Anuj: Even numbered floor (2,4,6)
(b) Bhola: Even numbered floor (2,4,6)
(c) Chandan lives on the floor above that of Faisal.
(d) Dilip: not on 2nd floor.
(e) Eswar: does not live immediately above or immediately below Bhola
From the options its clear, that only option (B) satisfies condition (e).
So, correct Ans is (B).
The smallest angle of a triangle is equal to two thirds of the smallest angle of a quadrilateral.
The ratio between the angles of the quadrilateral is 3:4:5:6. The largest angle of the triangle is
twice its smallest angle. What is the sum, in degrees, of the second largest angle of the
triangle and the largest angle of the quadrilateral?
Let the angles of quadrilateral are 3x, 4x, 5x, 6x
So, 3x+4x+5x+6x = 360
x = 20
Smallest angle of quadrilateral = 3×20 = 60°
Smallest angle of triangle = 2/3 x 60^{o} = 40^{o}
Largest angle of triangle = 2×40° = 60°
Three angles of triangle are 40°, 60°, 80°
Largest angle of quadrilateral is 120°
Sum (2nd largest angle of triangle + largest angle of quadrilateral)
= 60°+120°=180°.
One percent of the people of country X are taller than 6 ft. Two percent of the people of
country Y are taller than 6 ft. There are thrice as many people in country X as in country Y.
Taking both countries together, what is the percentage of people taller than 6 ft?
Let number of people in country y = 100
So, number of people in country x = 300
Total number of people taller than 6ft in both the countries
The monthly rainfall chart based on 50 years of rainfall in Agra is shown in the following
figure. Which of the following are true? (k percentile is the value such that k percent of the
data fall below that value)
(i) On average, it rains more in July than in December
(ii) Every year, the amount of rainfall in August is more than that in January
(iii) July rainfall can be estimated with better confidence than February rainfall
(iv) In August, there is at least 500 mm of rainfall
In the question the monthly average rainfall chart for 50 years has been given.
Let us check the options.
(i) On average, it rains more in July than in December correct.
(ii) Every year, the amount of rainfall in August is more than that in January.
⇒ may not be correct because average rainfall is given in the question.
(iii) July rainfall can be estimated with better confidence than February rainfall.
⇒ From chart it is clear the gap between 5 percentile and 95 percentile from average is higher in February than that in July ⇒ correct.
(iv) In August at least 500 mm rainfall
⇒May not be correct, because its 50 year average.
So correct option (B) (i) and (iii).
Q.No1135 Carry One Mark Each
Q.
Gradient of a scalar variable is always
For the time domain function, f(t) = t^{2} ,which ONE of the following is the Laplace transform
of
If f*(x) is the complex conjugate of f(x) = cos(x) + i sin(x), then for real a and b,
If f(x) is a real and continuous function of x, the Taylor series expansion of f(x) about
its minima will NEVER have a term containing
So, Taylor series expansion of f(x) about ‘a’ will never contain first derivative term.
From the following list, identify the properties which are equal in both vapour and
liquid phases at equilibrium
P. Density Temperature
R. Chemical potential S. Enthalpy
In a closed system, the isentropic expansion of an ideal gas with constant specific heats is
represented by
In order to achieve the same conversion under identical reaction conditions and feed flow rate
for a nonautocatalytic reaction of positive order, the volume of an ideal CSTR is
Integral of the timeweighted absolute error (ITAE) is expressed as
Let number of people in country y = 100
So, number of people in country x = 300
Total number of people taller than 6ft in both the countries
% of people taller than 6ft in both the countries =
A unit IMPULSE response of a first order system with time constant and steady
state gain K_{p} is given by
In a completely opaque medium, if 50% of the incident monochromatic radiation is absorbed,
then which of the following statements are CORRECT?
(P) 50% of the incident radiation is reflected
(Q) 25% of the incident radiation is reflected
(R) 25% of the incident radiation is transmitted
(S) No incident radiation is transmitted
In case of a pressure driven laminar flow of a Newtonian fluid of viscosity (μ) through a
horizontal circular pipe, the velocity of the fluid is proportional to
Which of the following statements are CORRECT?
(P) For a rheopectic fluid, the apparent viscosity increases with time under a constant applied
shear stress
(Q) For a pseudoplastic fluid, the apparent viscosity decreases with time under a constant
applied shear stress
(R) For a Bingham plastic, the apparent viscosity increases exponentially with the
deformation rate
(S) For a dilatant fluid, the apparent viscosity increases with increasing deformation rate
Assume that an ordinary mercuryinglass thermometer follows first order dynamics with a
time constant of 10s. It is at a steady state temperature of 0°C. At time t = 0, the thermometer
is suddenly immersed in a constant temperature bath at 100°C. The time required (in s) for
the thermometer to read 95°C, approximately is
Packed towers are preferred for gasliquid mass transfer operations with foaming liquids
because
A spherical storage vessel is quarter–filled with toluene. The diameter of the vent at the top of
the vessel is 1/20th of the diameter of the vessel. Under the steady state condition, the
diffusive flux of toluene is maximum at
Diffusive flux is maximum at the vent and remains same throughout the vent line at steady state.
In order to produce fine solid particles between 5 and 10 μm, the appropriate size reducing
equipment is
Slurries are most conveniently pumped by a
Assuming the mass transfer coefficients in the gas and the liquid phases are comparable, the
absorption of CO_{2} from reformer gas (CO_{2}+H_{2}) into an aqueous solution of diethanolamine is
controlled by
Which ONE of the following statements is CORRECT for the surface renewal theory?
Steam economy of a multiple effect evaporator system is defined as
Decomposition efficiency (D) of an electrolytic cell used for producing NaOH is defined as
The vessel dispersion number for an ideal CSTR is
Which ONE of the following statements is CORRECT?
Q.No3665 Carry Two Marks Each
Q.
Consider the following differential equation
The solution of this equation at x = 0.4 using Euler method with a step size of h= 0.2 is
The integrating factor for the differential equation
Given differential equation
The differential equation
This is clearly a linear differential equation
Order = 2
Degree = 1.
Consider the following two normal distributions
If μ and σ denote the mean and standard deviation, respectively, then
In rolling of two fair dice, the outcome of an experiment is considered to be the sum of the
numbers appearing on the dice. The probability is highest for the outcome of ___________
Where X is a random variable denotes the sum of the numbers appearing on the dice.
P(x) = corresponding probabilities
The probability is highest for the outcome “7” i.e., 6/36
A spherical ball of benzoic acid (diameter = 1.5 cm) is submerged in a pool of still water. The solubility and diffusivity of benzoic acid in water are 0.03 kmol/m^{3} and 1.25 x 10^{9} m^{2}/s respectively. Sherwood number is given as Sh = 2.0 + 0.6 0.33 Re^{0.5} Sc^{0.33} . The initial rate of dissolution (in kmol/s) of benzoic acid approximately is
A wet solid of 100 kg is dried from a moisture content of 40wt% to 10wt%. The critical moisture content is 15wt% and the equilibrium moisture content is negligible. All moisture contents are on dry basis. The falling rate is considered to be linear. It takes 5 hours to dry the material in the constant rate period. The duration (in hours) of the falling rate period is
Given X_{1} = 0.4
X_{2} = 0.10
X_{C} = 0.15
X* = 0
Constant rate period
A brick wall of 20 cm thickness has thermal conductivity of 0.7 W m^{1} K^{1}. An insulation of thermal conductivity 0.2 W m^{1} K^{1} is to be applied on one side of the wall, so that the heat transfer through the wall is reduced by 75%. The same temperature difference is maintained across the wall before and after applying the insulation. The required thickness (in cm) of the insulation is ____________
An oil with a flow rate of 1000 kg/h is to be cooled using water in a doublepipe counterflow heat exchanger from a temperature of 70°C to 40°C. Water enters the exchanger at 25°C and leaves at 40°C. The specific heats of oil and water are 2 kJ kg^{1} K^{1} and 4.2 kJ kg^{1} K^{1}, respectively. The overall heat transfer coefficient is 0.2 kW m^{2} K^{1}. The minimum heat exchanger area (in m^{2}) required for this operation is ______________
Given Cpo =2 kJkg^{1 }K^{1}
^{ }C_{po} =4.2 kJkg^{1 }K^{1}
U= 0.2kW m^{2}K^{1}
Which ONE of the following is CORRECT for an ideal gas in a closed system?
A binary distillation column is operating with a mixed feed containing 20 mol% vapour. If
the feed quality is changed to 80 mol% vapour, the change in the slope of the qline is
A homogeneous reaction (R → P) occurs in a batch reactor. The conversion of the reactant R is 67% after 10 minutes and 80% after 20 minutes. The rate equation for this reaction is
A vapour phase catalytic reaction (Q + R →S) follows Rideal mechanism (R and S are not adsorbed). Initially, the mixture contains only the reactants in equimolar ratio. The surface reaction step is rate controlling. With constants a and b, the initial rate of reaction ( −r_{0} ) in terms of total pressure (P_{T}) is given by
A incompressible fluid is flowing through a contraction section of length L and has a 1D (x
direction) steady state velocity distribution, If u_{0} = 2m/ s and L = 3m, the
convective acceleration (in m/s^{2}) of the fluid at L is _______
Tank in series model → PFR with axial mixing
Liquidliquid extraction → Mixer settler
Optimum temperature progression → Nonisothermal reaction
Thiele modulus → Solid catalyst reaction.
Two elemental gases (A and B) are reacting to form a liquid (C) in a steady state process as per the reaction. A + B→C. The singlepass conversion of the reaction is only 20% and hence recycle is used. The product is separated completely in pure form. The fresh feed has 49 mol% of A and B each along with 2 mol% impurities. The maximum allowable impurities in the recycle stream is 20 mol%. The amount of purge stream (in moles) per 100 moles of the fresh feed is ___________
Basis = 100 moles of fresh feed
A = 49 moles; B = 49 moles;
Inert, z = 2 moles
Overall balance on inert
2 = P×0.2 ⇒ P = 10
Carbon monoxide (CO) is burnt in presence of 200% excess pure oxygen and the flame
temperature achieved is 2298 K. The inlet streams are at 25 °C. The standard heat of
formation (at 25 °C) of CO and CO_{2} are 110kJ mol^{1} and 390kJ mol^{1}, respectively. The
heat capacities (in J mol^{1} K^{1}) of the components are
where, T is the temperature in K. The heat loss (in kJ) per mole of CO burnt
is_____________
Basis: 1 mole of CO burnt
O_{2} supplied = 0.5×3 = 1.5 mole
Unreacted O_{2} in product = 1 mole
Standard heat of reaction =  390 – (110) =  280 kJ/mol.
Heat of reactants = 0 (at 298k)
A cash flow of Rs. 12,000 per year is received at the end of each year (uniform periodic
payment) for 7 consecutive years. The rate of interest is 9% per year compounded annually.
The present worth (in Rs.) of such cash flow at time zero is __________
A polymer plant with a production capacity of 10,000 tons per year has an overall yield of 70%, on mass basis (kg of product per kg of raw material). The raw material costs Rs. 50,000 per ton. A process modification is proposed to increase the overall yield to 75% with an investment of Rs. 12.5 crore. In how many years can the invested amount be recovered with the additional profit? ___________
A step change of magnitude 2 is introduced into a system having the following transfer
function :
The percent overshoot is ___________________.
Given below is a simplified block diagram of a feedforward control system
The transfer function of the process is and the disturbance transfer function is
The transfer function of the PERFECT feed forward controller, Gf(s) is
The bottom face of a horizontal slab of thickness 6 mm is maintained at 300^{o}C. The top face is exposed to a flowing gas at 30^{o}C. The thermal conductivity of the slab is 1.5 W m^{1} K^{1} and the convective heat transfer coefficient is 30 W m^{2} K^{1}. At steady state, the temperature (in ^{o}C) of the top face is __________ .
At steady state
heat flux due to conduction = heat flux due to convection
In a steady incompressible flow, the velocity distribution is given by where, V is in m/s and x, y, and z are in m. In order to satisfy the mass conservation, the value
of the constant P (in s^{1}) is ____________.
Turbulence: Characterized by fluctuating velocity.
Ergun equation: for calculating pressure drop in packed bed.
Power number: For calculating power consumption in mixing tank.
In a steady and incompressible flow of a fluid (density = 1.25 kg m^{3}), the difference between stagnation and static pressures at the same location in the flow is 30 mm of mercury (density = 13600 kg m^{3}). Considering gravitational acceleration as 10 m s^{2}, the fluid speed (in m s^{1}) is ______________
Consider a binary liquid mixture at equilibrium with its vapour at 25OC. Antoine equation for this system is given as where t is in OC and p in Torr.
The Antoine constants (A, B, and C) for the system are given in the following table.
The vapour phase is assumed to be ideal and the activity coefficients ( γ_{i}) for the nonideal
liquid phase are given by
If the mole fraction of component 1 in liquid phase (x1) is 0.11, then the mole fraction of
component 1 in vapour phase (y1) is ___________
A process with transfer function is to be controlled by a feedback proportional controller with a gain K_{c}. If the transfer functions of all other elements in the control loop are unity, then which ONE of the following conditions produces a stable closed loop response?
Consider the following block diagram for a closedloop feedback control system
A proportional controller is being used with K_{C} = −4 . If a step change in disturbance of magnitude 2 affects the system, then the value of the offset is ____________
Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
Assertion: Significant combustion of coke takes place only if it is heated at higher
temperature in presence of air.
Reason: C + O_{2} →CO_{2} is an exothermic reaction
Both [a] and [r] are true but [r] is not the correct reason for [a].
Match the raw materials of Groups 1 and 2 with the final products of Group 3
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