Q1
MCQ[1 Mark]
After playing _________ hours of tennis, I am feeling _________ tired to walk
back.
(A)
too / too
(B)
too / two
(C)
two / two
(D)
two / too
Type:
General Aptitude
10 QuestionsQ2
MCQ[1 Mark]
The average of the monthly salaries of M, N and S is ₹ 4000. The average of the
monthly salaries of N, S and P is ₹ 5000. The monthly salary of P is ₹ 6000.
What is the monthly salary of M as a percentage of the monthly salary of P?
(A)
50%
(B)
75%
(C)
100%
(D)
125%
Q3
MCQ[1 Mark]
A person travelled 80 km in 6 hours. If the person travelled the first part with a
uniform speed of 10 kmph and the remaining part with a uniform speed of 18
kmph.
What percentage of the total distance is travelled at a uniform speed
of 10 kmph?
(A)
28.25
(B)
37.25
(C)
43.75
(D)
50.00
Q4
MCQ[1 Mark]
Four girls P, Q, R and S are studying languages in a University. P is learning
French and Dutch. Q is learning Chinese and Japanese. R is learning Spanish
and French. S is learning Dutch and Japanese.
Given that: French is easier than Dutch; Chinese is harder than Japanese; Dutch
is easier than Japanese, and Spanish is easier than French.
Based on the above information, which girl is learning the most difficult pair of
languages?
(A)
P
(B)
Q
(C)
R
(D)
S
Q5
MCQ[1 Mark]
A block with a trapezoidal cross-section is placed over a block with rectangular
cross section as shown above.
Which one of the following is the correct drawing of the view of the 3D object
as viewed in the direction indicated by an arrow in the above figure?
(A)
(B)
(C)
(D)
Q6
MCQ[2 Marks]
Humans are naturally compassionate and honest. In a study using strategically
placed wallets that appear “lost”, it was found that wallets with money are more
likely to be returned than wallets without money. Similarly, wallets that had a key
and money are more likely to be returned than wallets with the same amount of
money alone. This suggests that the primary reason for this behavior is
compassion and empathy.
Which one of the following is the CORRECT logical inference based on the
information in the above passage?
(A)
Wallets with a key are more likely to be returned because people do not care
about money
(B)
Wallets with a key are more likely to be returned because people relate to
suffering of others
(C)
Wallets used in experiments are more likely to be returned than wallets that are
really lost
(D)
Money is always more important than keys
Q7
MCQ[2 Marks]
A rhombus is formed by joining the midpoints of the sides of a unit square.
What is the diameter of the largest circle that can be inscribed within the
rhombus?
(A)
1
√2
(B)
1
2√2
(C)
√2
(D)
2√2
Q8
MCQ[2 Marks]
An equilateral triangle, a square and a circle have equal areas.
What is the ratio of the perimeters of the equilateral triangle to square to circle?
(A)
3√3 ∶2 ∶√𝜋
(B)
ට൫3 √3൯: 2 ∶√𝜋
(C)
ට൫3 √3൯: 4 ∶2√𝜋
(D)
ට൫3 √3൯: 2 ∶2√𝜋
Q9
MCQ[2 Marks]
Given below are three conclusions drawn based on the following three
statements.
Statement 1: All teachers are professors.
Statement 2: No professor is a male.
Statement 3: Some males are engineers.
Conclusion I: No engineer is a professor.
Conclusion II: Some engineers are professors.
Conclusion III: No male is a teacher.
Which one of the following options can be logically inferred?
(A)
Only conclusion III is correct
(B)
Only conclusion I and conclusion II are correct
(C)
Only conclusion II and conclusion III are correct
(D)
Only conclusion I and conclusion III are correct
Q10
MCQ[2 Marks]
In a 12-hour clock that runs correctly, how many times do the second, minute,
and hour hands of the clock coincide, in a 12-hour duration from 3 PM in a day
to 3 AM the next day?
(A)
11
(B)
12
(C)
144
(D)
2
Engineering Mathematics
7 QuestionsQ11
MCQ[1 Mark]
Given a function 𝜑=
ଵ
ଶ(𝑥ଶ+ 𝑦ଶ+ 𝑧ଶ) in three-dimensional Cartesian space, the
value of the surface integral
𝐧ෝ∙∇𝜑 d𝑆 ,
ௌ
where 𝑆 is the surface of a sphere of unit radius and 𝐧ෝ is the outward unit normal
vector on 𝑆, is
(A)
4𝜋
(B)
3𝜋
(C)
4𝜋/3
(D)
0
Q12
MCQ[1 Mark]
The Fourier series expansion of 𝑥ଷ in the interval −1 ≤𝑥< 1 with periodic
continuation has
(A)
only sine terms
(B)
only cosine terms
(C)
both sine and cosine terms
(D)
only sine terms and a non-zero constant
Q13
MCQ[1 Mark]
If 𝐀= ቂ
10
2𝑘+ 5
3𝑘−3
𝑘+ 5 ቃ is a symmetric matrix, the value of k is ___________.
(A)
8
(B)
5
(C)
−0.4
(D)
1 + √1561
12
Q14
MCQ[2 Marks]
The value of the integral
ර൬
6𝑧
2𝑧ସ−3𝑧ଷ+ 7𝑧ଶ−3𝑧+ 5൰d𝑧
evaluated over a counter-clockwise circular contour in the complex plane enclosing
only the pole 𝑧= 𝑖, where 𝑖 is the imaginary unit, is
(A)
(−1 + 𝑖) 𝜋
(B)
(1 + 𝑖) 𝜋
(C)
2(1 −𝑖)𝜋
(D)
(2 + 𝑖)𝜋
Q15
MSQ[2 Marks]
The system of linear equations in real (𝑥, 𝑦) given by
(𝑥
𝑦) ቈ
2
5 −2𝛼
𝛼
1
= (0
0)
involves a real parameter 𝛼 and has infinitely many non-trivial solutions for special
value(s) of 𝛼. Which one or more among the following options is/are non-trivial
solution(s) of (𝑥, 𝑦) for such special value(s) of 𝛼?
(A)
𝑥= 2, 𝑦= −2
(B)
𝑥= −1, 𝑦= 4
(C)
𝑥= 1,
𝑦= 1
(D)
𝑥= 4,
𝑦= −2
Q16
NAT[2 Marks]
Let a random variable X follow Poisson distribution such that
Prob(𝑋= 1) = Prob(𝑋= 2).
The value of Prob(𝑋= 3) is __________ (round off to 2 decimal places).
Q17
NAT[2 Marks]
Consider two vectors:
𝑎⃗= 5 𝐢+ 7 𝐣+ 2 𝐤
𝑏ሬ⃗= 3 𝐢− 𝐣+ 6 𝐤
Magnitude of the component of 𝑎⃗ orthogonal to 𝑏ሬ⃗ in the plane containing the vectors
𝑎⃗ and 𝑏ሬ⃗ is __________ (round off to 2 decimal places).
Applied Mechanics and Design
22 QuestionsQ18
MCQ[1 Mark]
A uniform light slender beam AB of section modulus 𝐸𝐼 is pinned by a frictionless
joint A to the ground and supported by a light inextensible cable CB to hang a
weight 𝑊 as shown. If the maximum value of 𝑊 to avoid buckling of the beam AB
is obtained as 𝛽𝜋ଶ𝐸𝐼, where 𝜋 is the ratio of circumference to diameter of a circle,
then the value of 𝛽 is
(A)
0.0924 m-2
(B)
0.0713 m-2
(C)
0.1261 m-2
(D)
0.1417 m-2
2.5 m
30°
𝑊
𝑔
C
B
A
Q19
MCQ[1 Mark]
The figure shows a schematic of a simple Watt governor mechanism with the
spindle O1O2 rotating at an angular velocity ω about a vertical axis. The balls at P
and S have equal mass. Assume that there is no friction anywhere and all other
components are massless and rigid. The vertical distance between the horizontal
plane of rotation of the balls and the pivot O1 is denoted by h. The value of
h = 400 mm at a certain ω. If ω is doubled, the value of h will be _________ mm.
(A)
50
(B)
100
(C)
150
(D)
200
Q20
MCQ[1 Mark]
A square threaded screw is used to lift a load W by applying a force F. Efficiency
of square threaded screw is expressed as
(A)
The ratio of work done by W per revolution to work done by F per revolution
(B)
𝑾/𝑭
(C)
𝑭/𝑾
(D)
The ratio of work done by F per revolution to work done by W per revolution
Q21
MCQ[1 Mark]
A CNC worktable is driven in a linear direction by a lead screw connected
directly to a stepper motor. The pitch of the lead screw is 5 mm. The stepper
motor completes one full revolution upon receiving 600 pulses. If the worktable
speed is 5 m/minute and there is no missed pulse, then the pulse rate being
received by the stepper motor is
(A)
20 kHz
(B)
10 kHz
(C)
3 kHz
(D)
15 kHz
Q22
MCQ[1 Mark]
The type of fit between a mating shaft of diameter 25.0
ା.ଵ
ି.ଵ mm and a hole of
diameter 25.015
ା .ଵହ
ି.ଵହ mm is __________.
(A)
Clearance
(B)
Transition
(C)
Interference
(D)
Linear
Q23
MSQ[1 Mark]
Assuming the material considered in each statement is homogeneous, isotropic, linear
elastic, and the deformations are in the elastic range, which one or more of the
following statement(s) is/are TRUE?
(A)
A body subjected to hydrostatic pressure has no shear stress.
(B)
If a long solid steel rod is subjected to tensile load, then its volume increases.
(C)
Maximum shear stress theory is suitable for failure analysis of brittle materials.
(D)
If a portion of a beam has zero shear force, then the corresponding portion of the
elastic curve of the beam is always straight.
Q24
MSQ[1 Mark]
Which of the following methods can improve the fatigue strength of a circular mild
steel (MS) shaft?
(A)
Enhancing surface finish
(B)
Shot peening of the shaft
(C)
Increasing relative humidity
(D)
Reducing relative humidity
Q25
NAT[1 Mark]
The plane of the figure represents a horizontal plane. A thin rigid rod at rest is
pivoted without friction about a fixed vertical axis passing through O. Its mass
moment of inertia is equal to 0.1 kg∙cm2 about O. A point mass of 0.001 kg hits it
normally at 200 cm/s at the location shown, and sticks to it. Immediately after the
impact, the angular velocity of the rod is ___________ rad/s (in integer).
O
200 cm/s
10 cm
Q26
NAT[1 Mark]
A flat plate made of cast iron is exposed to a solar flux of 600 W/m2 at an ambient
temperature of 25 C. Assume that the entire solar flux is absorbed by the plate.
Cast iron has a low temperature absorptivity of 0.21. Use Stefan-Boltzmann
constant = 5.669 10-8 W/m2-K4. Neglect all other modes of heat transfer except
radiation.
Under the aforementioned conditions, the radiation equilibrium temperature of the
plate is __________ C (round off to the nearest integer).
Q27
MCQ[2 Marks]
An L-shaped elastic member ABC with slender arms AB and BC of uniform cross-
section is clamped at end A and connected to a pin at end C. The pin remains in
continuous contact with and is constrained to move in a smooth horizontal slot. The
section modulus of the member is same in both the arms. The end C is subjected to
a horizontal force 𝑃 and all the deflections are in the plane of the figure. Given the
length AB is 4𝑎 and length BC is 𝑎, the magnitude and direction of the normal force
on the pin from the slot, respectively, are
(A)
3𝑃/8, and downwards
(B)
5𝑃/8, and upwards
(C)
𝑃/4, and downwards
(D)
3𝑃/4, and upwards
A
B
C
4a
P
a
Q28
MCQ[2 Marks]
A planar four-bar linkage mechanism with 3 revolute kinematic pairs and 1
prismatic kinematic pair is shown in the figure, where AB ⊥ CE and FD ⊥ CE. The
T-shaped link CDEF is constructed such that the slider B can cross the point D, and
CE is sufficiently long. For the given lengths as shown, the mechanism is
(A)
a Grashof chain with links AG, AB, and CDEF completely rotatable about the
ground link FG
(B)
a non-Grashof chain with all oscillating links
(C)
a Grashof chain with AB completely rotatable about the ground link FG, and
oscillatory links AG and CDEF
(D)
on the border of Grashof and non-Grashof chains with uncertain configuration(s)
G
A
B
D
C
F
5 cm
3 cm
1.5 cm
3 cm
E
Q29
MCQ[2 Marks]
Consider
a
forced
single
degree-of-freedom
system
governed
by
𝑥̈(𝑡) + 2ζ𝜔𝑥̇(𝑡) + 𝜔
ଶ𝑥(𝑡) = 𝜔
ଶcos(𝜔𝑡), where ζ and 𝜔 are the
damping ratio and undamped natural frequency of the system, respectively, while
𝜔 is the forcing frequency. The amplitude of the forced steady state response of this
system is given by [(1 −𝑟ଶ)ଶ+ (2ζ𝑟)ଶ]ିଵ/ଶ, where 𝑟= 𝜔/𝜔. The peak
amplitude of this response occurs at a frequency 𝜔= 𝜔. If 𝜔ௗ denotes the
damped natural frequency of this system, which one of the following options is
true?
(A)
𝜔< 𝜔ௗ< 𝜔
(B)
𝜔= 𝜔ௗ< 𝜔
(C)
𝜔ௗ< 𝜔= 𝜔
(D)
𝜔ௗ< 𝜔< 𝜔
Q30
MCQ[2 Marks]
A bracket is attached to a vertical column by means of two identical rivets U and V
separated by a distance of 2a = 100 mm, as shown in the figure. The permissible
shear stress of the rivet material is 50 MPa. If a load P = 10 kN is applied at an
eccentricity 𝑒= 3√7 𝑎, the minimum cross-sectional area of each of the rivets to
avoid failure is ___________ mm2.
(A)
800
(B)
25
(C)
100√7
(D)
200
Q31
MCQ[2 Marks]
Consider a rod of uniform thermal conductivity whose one end (𝑥= 0) is insulated
and the other end (𝑥= 𝐿) is exposed to flow of air at temperature T∞ with
convective heat transfer coefficient h. The cylindrical surface of the rod is insulated
so that the heat transfer is strictly along the axis of the rod. The rate of internal heat
generation per unit volume inside the rod is given as
𝑞̇ = cos 2𝜋𝑥
𝐿 .
The steady state temperature at the mid-location of the rod is given as TA. What
will be the temperature at the same location, if the convective heat transfer
coefficient increases to 2h?
(A)
𝑇+ 𝑞̇𝐿
2ℎ
(B)
2𝑇
(C)
𝑇
(D)
𝑇൬1 −𝑞̇𝐿
4𝜋ℎ൰+ 𝑞̇𝐿
4𝜋ℎ𝑇ஶ
Q32
NAT[2 Marks]
A structure, along with the loads applied on it, is shown in the figure. Self-weight
of all the members is negligible and all the pin joints are friction-less. AE is a single
member that contains pin C. Likewise, BE is a single member that contains pin D.
Members GI and FH are overlapping rigid members. The magnitude of the force
carried by member CI is ________ kN (in integer).
2m
2m
3m
3m
3m
3.5 m
3m
A
B
C
D
E
I
H
F
G
2 kN
4 kN
Q33
NAT[2 Marks]
Two rigid massless rods PR and RQ are joined at frictionless pin-joint R and are
resting on ground at P and Q, respectively, as shown in the figure. A vertical force
F acts on the pin R as shown. When the included angle 𝜃< 90°, the rods remain in
static equilibrium due to Coulomb friction between the rods and ground at locations
P and Q. At 𝜃= 90°, impending slip occurs simultaneously at points P and Q. Then
the ratio of the coefficient of friction at Q to that at P (µQ /µP) is _________ (round
off to two decimal places).
P
Q
F
5 m
12 m
R
𝜃
Q34
NAT[2 Marks]
A cylindrical disc of mass 𝑚= 1 kg and radius 𝑟= 0.15 m was spinning at
𝜔= 5 rad/s when it was placed on a flat horizontal surface and released (refer to
the figure). Gravity 𝑔 acts vertically downwards as shown in the figure. The
coefficient of friction between the disc and the surface is finite and positive.
Disregarding any other dissipation except that due to friction between the disc and
the surface, the horizontal velocity of the center of the disc, when it starts rolling
without slipping, will be _________ m/s (round off to 2 decimal places).
Q35
NAT[2 Marks]
A thin-walled cylindrical pressure vessel has mean wall thickness of 𝑡 and nominal
radius of 𝑟. The Poisson’s ratio of the wall material is 1/3. When it was subjected
to some internal pressure, its nominal perimeter in the cylindrical portion increased
by 0.1% and the corresponding wall thickness became 𝑡̅. The corresponding change
in the wall thickness of the cylindrical portion, i.e. 100 × (𝑡̅ −𝑡)/𝑡, is ________%
(round off to 3 decimal places).
𝜔
𝑟
𝑚
𝑔
Q36
NAT[2 Marks]
A schematic of an epicyclic gear train is shown in the figure. The sun (gear 1) and
planet (gear 2) are external, and the ring gear (gear 3) is internal. Gear 1, gear 3 and
arm OP are pivoted to the ground at O. Gear 2 is carried on the arm OP via the pivot
joint at P, and is in mesh with the other two gears. Gear 2 has 20 teeth and gear 3
has 80 teeth. If gear 1 is kept fixed at 0 rpm and gear 3 rotates at 900 rpm counter
clockwise (ccw), the magnitude of angular velocity of arm OP is __________rpm
(in integer).
Q37
NAT[2 Marks]
Under orthogonal cutting condition, a turning operation is carried out on a
metallic workpiece at a cutting speed of 4 m/s. The orthogonal rake angle of the
cutting tool is 5º. The uncut chip thickness and width of cut are 0.2 mm and 3 mm,
respectively. In this turning operation, the resulting friction angle and shear angle
are 45º and 25º, respectively. If the dynamic yield shear strength of the workpiece
material under this cutting condition is 1000 MPa, then the cutting force is
______________ N (round off to one decimal place).
Q38
NAT[2 Marks]
A 4 mm thick aluminum sheet of width w = 100 mm is rolled in a two-roll mill of
roll diameter 200 mm each. The workpiece is lubricated with a mineral oil, which
gives a coefficient of friction, µ = 0.1. The flow stress (𝜎 ) of the material in MPa
is 𝜎 = 207 + 414 𝜀, where 𝜀 is the true strain. Assuming rolling to be a plane strain
deformation process, the roll separation force (F) for maximum permissible draft
(thickness reduction) is _________ kN (round off to the nearest integer).
Use:
𝐹= 1.15 𝜎ത ቀ1 +
µ
ଶഥቁ 𝑤𝐿, where 𝜎ത is average flow stress, 𝐿 is roll-workpiece
contact length, and ℎത is the average sheet thickness.
Q39
NAT[2 Marks]
The product structure diagram shows the number of different components required
at each level to produce one unit of the final product P. If there are 50 units of on-
hand inventory of component A, the number of additional units of component A
needed to produce 10 units of product P is _________ (in integer).
Fluid Mechanics and Thermal Sciences
15 QuestionsQ40
MCQ[1 Mark]
The Clausius inequality holds good for
(A)
any process
(B)
any cycle
(C)
only reversible process
(D)
only reversible cycle
Q41
MCQ[1 Mark]
A tiny temperature probe is fully immersed in a flowing fluid and is moving with
zero relative velocity with respect to the fluid. The velocity field in the fluid is
𝑽ሬ⃗= (2𝑥)ଙ̂ + (𝑦+ 3𝑡)ଚ̂,
and
the
temperature
field
in
the
fluid
is
𝑇= 2𝑥ଶ+ 𝑥𝑦+ 4𝑡, where x and y are the spatial coordinates, and t is the time. The
time
rate
of
change
of
temperature
recorded
by
the
probe
at
(𝑥= 1, 𝑦= 1, 𝑡= 1) is _______.
(A)
4
(B)
0
(C)
18
(D)
14
Q42
MCQ[1 Mark]
In the following two-dimensional momentum equation for natural convection over
a surface immersed in a quiescent fluid at temperature 𝑇ஶ (𝑔 is the gravitational
acceleration, 𝛽 is the volumetric thermal expansion coefficient, 𝝂 is the kinematic
viscosity, 𝑢 and 𝑣 are the velocities in 𝑥 and 𝑦 directions, respectively, and T is the
temperature)
𝑢
డ௨
డ௫+ 𝑣
డ௨
డ௬= 𝑔𝛽(𝑇−𝑇ஶ) + 𝝂
డమ௨
డ௬మ ,
the term 𝑔𝛽(𝑇−𝑇ஶ) represents
(A)
Ratio of inertial force to viscous force.
(B)
Ratio of buoyancy force to viscous force.
(C)
Viscous force per unit mass.
(D)
Buoyancy force per unit mass.
Q43
MSQ[1 Mark]
The figure shows a purely convergent nozzle with a steady, inviscid compressible
flow of an ideal gas with constant thermophysical properties operating under
choked condition. The exit plane shown in the figure is located within the nozzle.
If the inlet pressure (P0) is increased while keeping the back pressure (Pback)
unchanged, which of the following statements is/are true?
(A)
Mass flow rate through the nozzle will remain unchanged.
(B)
Mach number at the exit plane of the nozzle will remain unchanged at unity.
(C)
Mass flow rate through the nozzle will increase.
(D)
Mach number at the exit plane of the nozzle will become more than unity.
Q44
NAT[1 Mark]
A polytropic process is carried out from an initial pressure of 110 kPa and volume
of 5 m3 to a final volume of 2.5 m3. The polytropic index is given by 𝑛= 1.2. The
absolute value of the work done during the process is _______ kJ (round off to 2
decimal places).
Q45
MCQ[2 Marks]
In Fe-Fe3C phase diagram, the eutectoid composition is 0.8 weight % of carbon at
725 ºC. The maximum solubility of carbon in α-ferrite phase is 0.025 weight % of
carbon. A steel sample, having no other alloying element except 0.5 weight % of
carbon, is slowly cooled from 1000 ºC to room temperature. The fraction of
pro-eutectoid α-ferrite in the above steel sample at room temperature is
(A)
0.387
(B)
0.864
(C)
0.475
(D)
0.775
Q46
MCQ[2 Marks]
A solid spherical bead of lead (uniform density = 11000 kg/m3) of diameter
d = 0.1 mm sinks with a constant velocity V in a large stagnant pool of a liquid
(dynamic viscosity = 1.1 × 10ିଷ kg∙m∙s). The coefficient of drag is given by
𝑐=
ଶସ
ୖୣ, where the Reynolds number (Re) is defined on the basis of the diameter
of the bead. The drag force acting on the bead is expressed as
𝐷= (𝑐)(0.5𝜌𝑉ଶ) ቀ
గௗమ
ସቁ, where ρ is the density of the liquid. Neglect the
buoyancy force. Using 𝑔= 10 m/s2, the velocity V is __________ m/s.
(A)
1
24
(B)
1
6
(C)
1
18
(D)
1
12
Q47
MCQ[2 Marks]
Consider steady, one-dimensional compressible flow of a gas in a pipe of diameter
1 m. At one location in the pipe, the density and velocity are 1 kg/m3 and 100 m/s,
respectively. At a downstream location in the pipe, the velocity is 170 m/s. If the
pressure drop between these two locations is 10 kPa, the force exerted by the gas
on the pipe between these two locations is ____________ N.
(A)
350𝜋ଶ
(B)
750π
(C)
1000π
(D)
3000
Q48
NAT[2 Marks]
Two mild steel plates of similar thickness, in butt-joint configuration, are welded
by gas tungsten arc welding process using the following welding parameters.
Welding voltage
20 V
Welding current
150 A
Welding speed
5 mm/s
A filler wire of the same mild steel material having 3 mm diameter is used in this
welding process. The filler wire feed rate is selected such that the final weld bead
is composed of 60% volume of filler and 40% volume of plate material. The heat
required to melt the mild steel material is 10 J/mm3. The heat transfer factor is 0.7
and melting factor is 0.6. The feed rate of the filler wire is __________ mm/s (round
off to one decimal place).
Q49
NAT[2 Marks]
Consider a one-dimensional steady heat conduction process through a solid slab of
thickness 0.1 m. The higher temperature side A has a surface temperature of 80 C,
and the heat transfer rate per unit area to low temperature side B is 4.5 kW/m2. The
thermal conductivity of the slab is 15 W/m.K. The rate of entropy generation per
unit area during the heat transfer process is ________ W/m2.K (round off to 2
decimal places).
Q50
NAT[2 Marks]
In a steam power plant based on Rankine cycle, steam is initially expanded in a
high-pressure turbine. The steam is then reheated in a reheater and finally expanded
in a low-pressure turbine. The expansion work in the high-pressure turbine is
400 kJ/kg and in the low-pressure turbine is 850 kJ/kg, whereas the pump work
is 15 kJ/kg. If the cycle efficiency is 32%, the heat rejected in the condenser
is ________ kJ/kg (round off to 2 decimal places).
Q51
NAT[2 Marks]
An engine running on an air standard Otto cycle has a displacement volume
250 cm3 and a clearance volume 35.7 cm3. The pressure and temperature at the
beginning of the compression process are 100 kPa and 300 K, respectively. Heat
transfer during constant-volume heat addition process is 800 kJ/kg. The specific
heat at constant volume is 0.718 kJ/kg.K and the ratio of specific heats at constant
pressure and constant volume is 1.4. Assume the specific heats to remain constant
during the cycle. The maximum pressure in the cycle is ______ kPa (round off to
the nearest integer).
Q52
NAT[2 Marks]
A steady two-dimensional flow field is specified by the stream function
𝜓= 𝑘𝑥ଷ𝑦,
where 𝑥 and 𝑦 are in meter and the constant 𝑘 = 1 ms. The magnitude of
acceleration at a point (x, y) = (1 m, 1 m) is ________ m/s2 (round off to 2 decimal
places).
Q53
NAT[2 Marks]
Consider a solid slab (thermal conductivity, k = 10 W∙m∙K) with thickness
0.2 m and of infinite extent in the other two directions as shown in the figure.
Surface 2, at 300 K, is exposed to a fluid flow at a free stream temperature (T∞) of
293 K, with a convective heat transfer coefficient (h) of 100 W∙m∙K. Surface 2
is opaque, diffuse and gray with an emissivity () of 0.5 and exchanges heat by
radiation with very large surroundings at 0 K. Radiative heat transfer inside the solid
slab is neglected. The Stefan-Boltzmann constant is 5.67×108 W∙m∙K. The
temperature T1 of Surface 1 of the slab, under steady-state conditions,
is _________ K (round off to the nearest integer).
Q54
NAT[2 Marks]
During open-heart surgery, a patient’s blood is cooled down to 25 C from 37 C
using a concentric tube counter-flow heat exchanger. Water enters the heat
exchanger at 4 C and leaves at 18 C. Blood flow rate during the surgery is
5 L/minute.
Use the following fluid properties:
Fluid
Density (kg/m3)
Specific heat (J/kg-K)
Blood
1050
3740
Water
1000
4200
Effectiveness of the heat exchanger is _________ (round off to 2 decimal places).
Materials, Manufacturing and Industrial Engineering
11 QuestionsQ55
MCQ[1 Mark]
- 35 Carry ONE mark each.
Q56
MCQ[1 Mark]
Solution of ∇ଶ𝑇= 0 in a square domain (0 < 𝑥< 1 and 0 < 𝑦< 1) with
boundary conditions:
𝑇(𝑥, 0) = 𝑥; 𝑇(0, 𝑦) = 𝑦; 𝑇(𝑥, 1) = 1 + 𝑥; 𝑇(1, 𝑦) = 1 + 𝑦
is
(A)
𝑇(𝑥, 𝑦) = 𝑥−𝑥𝑦+ 𝑦
(B)
𝑇(𝑥, 𝑦) = 𝑥+ 𝑦
(C)
𝑇(𝑥, 𝑦) = −𝑥+ 𝑦
(D)
𝑇(𝑥, 𝑦) = 𝑥+ 𝑥𝑦+ 𝑦
Q57
MCQ[1 Mark]
In a linear programming problem, if a resource is not fully utilized, the shadow
price of that resource is
(A)
positive
(B)
negative
(C)
zero
(D)
infinity
Q58
MCQ[1 Mark]
Which one of the following is NOT a form of inventory?
(A)
Raw materials
(B)
Work-in-process materials
(C)
Finished goods
(D)
CNC Milling Machines
Q59
MSQ[1 Mark]
Which of the following heat treatment processes is/are used for surface hardening
of steels?
(A)
Carburizing
(B)
Cyaniding
(C)
Annealing
(D)
Carbonitriding
Q60
MSQ[1 Mark]
Which of the following additive manufacturing technique(s) can use a wire as a
feedstock material?
(A)
Stereolithography
(B)
Fused deposition modeling
(C)
Selective laser sintering
(D)
Directed energy deposition processes
Q61
NAT[1 Mark]
A rigid uniform annular disc is pivoted on a knife edge A in a uniform gravitational
field as shown, such that it can execute small amplitude simple harmonic motion in
the plane of the figure without slip at the pivot point. The inner radius 𝑟 and outer
radius 𝑅 are such that 𝑟ଶ= 𝑅ଶ/2, and the acceleration due to gravity is 𝑔. If the
time period of small amplitude simple harmonic motion is given by 𝑇= 𝛽𝜋ඥ𝑅/𝑔,
where 𝜋 is the ratio of circumference to diameter of a circle, then 𝛽= ________
(round off to 2 decimal places).
Q62
NAT[1 Mark]
Electrochemical machining operations are performed with tungsten as the tool, and
copper and aluminum as two different workpiece materials. Properties of copper
and aluminum are given in the table below.
Material
Atomic mass
(amu)
Valency
Density (g/cm3)
Copper
63
2
9
Aluminum
27
3
2.7
Ignore overpotentials, and assume that current efficiency is 100% for both the
workpiece materials. Under identical conditions, if the material removal rate (MRR)
of copper is 100 mg/s, the MRR of aluminum will be ________________ mg/s
(round-off to two decimal places).
𝑟
G
A
𝑅
𝑔
Q63
MCQ[2 Marks]
Activities A to K are required to complete a project. The time estimates and the
immediate predecessors of these activities are given in the table. If the project is to
be completed in the minimum possible time, the latest finish time for the activity G
is ____________ hours.
Activity
Time (hours)
Immediate predecessors
A
2
─
B
3
─
C
2
─
D
4
A
E
5
B
F
4
B
G
3
C
H
10
D, E
I
5
F
J
8
G
K
3
H, I, J
(A)
5
(B)
10
(C)
8
(D)
9
Q64
NAT[2 Marks]
A 1 mm thick cylindrical tube, 100 mm in diameter, is orthogonally turned such
that the entire wall thickness of the tube is cut in a single pass. The axial feed of the
tool is 1 m/minute and the specific cutting energy (u) of the tube material is
6 J mmଷ
⁄
. Neglect contribution of feed force towards power. The power required to
carry out this operation is _________ kW (round off to one decimal place).
Q65
NAT[2 Marks]
An assignment problem is solved to minimize the total processing time of four jobs
(1, 2, 3 and 4) on four different machines such that each job is processed exactly by
one machine and each machine processes exactly one job. The minimum total
processing time is found to be 500 minutes. Due to a change in design, the
processing time of Job 4 on each machine has increased by 20 minutes. The revised
minimum total processing time will be _____________ minutes (in integer).