The material which possesses high electrical conductivity, high thermal conductivity, high melting
point and good oxidation resistance for low cost application
a.
Silver
b.
Steel
c.
Copper
Correct Answer
d.
Titanium
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Q3mcq
The most desirable method of increasing the yield strength of mild steel is
a.
Grain refinement
Correct Answer
b.
Cold working
c.
Solute additions
d.
Precipitation hardening
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Q4mcq
Which of the following material has maximum magnetic permeability?
a.
Pure Iron
b.
4 % Silicon Steel
Correct Answer
c.
Grain oriented Si-Fe
d.
Cast Iron
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Q5mcq
The criterion that works well for laminated composites made by stacking laminae of fiber reinforced
composites in different orientation is
a.
Quadratic interaction criterion
Correct Answer
b.
Tensor polynomial
c.
Maximum strain failure criterion
d.
Laminated plate theory
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Q6mcq
Many ceramic bodies contain residual porosity, which is deleterious to both their
a.
Brittleness and susceptibility
b.
Modulus of Elasticity and Fracture strength
Correct Answer
c.
Flexural strength and viscosity
d.
Plastic deformation and tensile stress
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Q7mcq
High energy ball milling is working under the category of
a.
Bottom-up approach
b.
Top-down approach
Correct Answer
c.
Sputtering approach
d.
Over potential approach
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Q8mcq
________ materials have powerful magnetic properties.
a.
Ferromagnetic
Correct Answer
b.
Paramagnetic
c.
Diamagnetic
d.
Soft magnetic
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Q9mcq
Which one of the following is not a strengthening mechanism of metals?
a.
Strain Aging
b.
Strain hardening
c.
Shearing
Correct Answer
d.
Solid solution hardening
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Q10mcq
Pultrusion process is
a.
Used for manufacture of components having continuous
Correct Answer
b.
Used for making pulverised particles lengths and a constant cross sectional shape
c.
Used for making powders with micron level size
d.
Used for manufacture of Glass components with constant cross sectional area
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Match correctly the grade of the monel material : (a) Age hardenable grade 1. R monel (b) Free
machining grade 2. H monel (c) Hard casting grade 3. K monel (d) Age hardenable casting grade 4. S monel
a.
2 3 4 1
b.
3 1 2 4
c.
4 2 3 1
d.
1 4 3 2
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Assertion [A] : The main difference between vapour compression refrigeration cycle and Bell-
Coleman gas refrigeration cycle is that in gas cycle an expander is used in place of a throttling valve.
Reason [R] : In throttling of a perfect gas, entropy remains constant.
a.
Both [A] and [R] are true and [R] is the correct
b.
Both [A] and [R] are true, but [R] is not a correct explanation of [A] explanation of [A]
c.
[A] is true but [R] is false
d.
[A] is false but [R] is true
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The bore and stroke of an engine working on otto cycle are 17 cm and 30 cm respectively. The
clearance volume is 0.001025 $m³$. Calculate the air standard efficiency,
a.
53.5%
b.
54.6%
c.
55.7%
d.
57.8%
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In an ideal gas turbine cycle with intercooling reheating, and regeneration, as the number of
compression and expansion stages is increased, the cycle thermal efficiency approaches
a.
100% efficiency
b.
Equal to otto cycle efficiency
c.
Carnot cycle efficiency
d.
Infinite
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In a reversed Carnot cycle, the heat pump reject 200 J of heat to the hot reservoir. If the cop of the
heat pump is 2, how much work is required to operate it?
a.
100 J
b.
200 J
c.
300 J
d.
400 J
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A fluid system going through a cycle as process 1-2 Isochoric heat addition of 300 kJ/kg, process 2-3
Adiabatic expansion to its original pressure with loss of 80 kJ/kg in internal energy and process 3-1
isobaric compression to its original value with heat rejection of 260 kJ/kg. The amount of work transfer in
process 3-1 will be
a.
- 40 kJ/kg
b.
40 kJ/kg
c.
60 kJ/kg
d.
- 60 kJ/kg
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A domestic food freezer maintains a temperature of -15°C. The ambient air temperature is 30°C. If heat
leaks into the freezer at the continuous rate of 1.75 Kg/s what is the least power necessary to pump this
heat out continuously?
a.
0.30 KW
b.
0.32 KW
c.
0.31 KW
d.
0.35 KW
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Assertion [A] : The change in heat and work cannot be expressed as difference between the end
states. Reason [R] : Heat and work both are exact differential.
a.
Both [A] and [R] are individually true and [R] is the
b.
Both [A] and [R] are individually true but [R] is not the correct explanation of [A] correct explanation of [A]
c.
[A] is true but [R] is false
d.
[A] is false but [R] is true
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Which of the following thermodynamic properties related to the Clausius – Clapeyron equation? (1)
Saturation Pressure (2) Saturation Temperature (3) Entropy (4) Specific volume (5) Enthalpy of
vapourisation (6) Internal energy Select the correct answer.
a.
(1), (2), (6), (5)
b.
(4), (2), (3), (5)
c.
(6), (4), (1)
d.
(4), (5), (2), (1)
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A round hole 12 mm in diameter is being produced in a titanium alloy block by electro discharge
machining. Calculate the material removal rate. The melting point of the alloy is 1873.15 K and that of
current used is 100 A.
a.
658 $mm³/min$
b.
458 $mm³/min$
c.
258 $mm³/min$
d.
158 $mm³/min$
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For the following data relate to an orthogonal turning process: Chip thickness $=$ 0.62 mm Feed $=$ 0.2
mm/rev Rake angle $=$ 15° Calculate cutting ratio.
a.
0.422
b.
0.322
c.
0.522
d.
0.622
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A symmetrical cap of circular cross section with radius 20 mm and height 60 mm, with a corner radius
of 2 mm is to be obtained in C40 steel of 0.6 mm thickness. Find the blank diameter.
a.
102.52 mm
b.
113.32 mm
c.
110 mm
d.
105.83 mm
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In a Surface Roughness testing, the five Highest peak values are 39 µm, 42 µm, 51 µm, 40 µm and 45
µm and the five Deepest values are 34 µm, 32 µm, 35 µm, 30 µm and 29 µm. The surface Roughness $R_{z}$
value in µm is
a.
44
b.
13
c.
65
d.
35
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The surface profile obtained from a machining operation is rectangular in nature, with equal heights
above and below the mean line. If the maximum peak to valley height $R_{t}$ is 16 µm, what is the value of
average Roughness, $R_{a}?$
a.
8 µm
b.
20 µm
c.
16 µm
d.
4 µm
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A Go/No Go gauge is to be designed to check a 40 H8/h7 hole/shaft pair. The tolerance for the hole is
39 µm and for the shaft is 25 µm. Neglecting gauge tolerance and wear allowance, the size of the Go plug
gauge and Go ring gauge are
a.
40.039 mm, 40.025 mm
b.
40.025 mm, 40.039 mm
c.
39.975 mm, 40.039 mm
d.
40 mm, 40 mm
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The parallelism of a gauge block's surface is tested using NPL flatness interferometer. Ten fringes
were seen along the block's width in one position and Eighteen fringes in the other position (after rotating
the work table by 180°). Determine the error in parallelism of the gauge block if the wavelength of the light
source is 0.5 µm.
a.
0.5 µm
b.
1 µm
c.
2 µm
d.
4 µm
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A clutch has outer and inner diameters of 100 mm and 40 mm respectively. Assuming a uniform
pressure of 2 Mpa and coefficient of friction of linear material is 0.4, the torque carrying capacity of the
clutch is
a.
148 Nm
b.
196 Nm
c.
372 Nm
d.
490 Nm
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Two closed coil springs are made from the same small diameter wire, one wound on 2.5 cm diameter
core and the other on 1.25 cm diameter core. If each spring had 'N' coils then the ratio of their spring
constants should be
a.
1/16
b.
1/8
c.
1/4
d.
1/2
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A spherical shell of diameter 500 mm and thickness 8 mm is completely filled with a liquid at
atmospheric pressure. Taking efficiency of joint as 75% and permissible stress as 80 $N/mm²$. Determine the
maximum pressure that can be permitted
a.
2.73 $N/mm²$
b.
2.38 $N/mm²$
c.
3.26 $N/mm²$
d.
3.84 $N/mm²$
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A shaft is subjected torsion the relation between maximum shear stress $(f_{s}$), modulus of rigidity of
the shaft (c) and angle of twist $(θ$) is given by L $=$ Length of shaft R $=$ Radius of shaft
a.
C $θ$ / $f_{s}$ $=$ R / L
b.
C Q / L $=$ $f_{s}$ / R
c.
C $θ$ / R $=$ $f_{s}$ / L
d.
C / L $θ$ $=$ $f_{s}$ / R
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A thick spherical shell of 400 mm inside diameter is subjected to an internal pressure of 1.5 Mp <. If
the permissible stress in the shell material is limited to 3 Mp<, determine Lame's constants.
a.
1.8, $15×10⁶$
b.
1.5, $18×10⁶$
c.
1.5, $12×10⁶$
d.
1.2, $15×10⁶$
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Maximum shear stress theory, such as $T_{y}$ $=$ $σ_y$ / 2 and $T_{max}$ $=$ $(σ_max$ - $σ_min$) / 2, then failure
occurs when, $T_{max}$ $=$ τ_y is proved by
a.
Rankine
b.
Coulomb
c.
St Venant
d.
Von Mises
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The tensile stresses at a point across two mutually perpendicular planes are 120 $N/mm²$ and 60 N/
$mm²$. Determine the normal stress on a plane inclined at 30° to the axis of the minor stress
a.
108.16 $N/mm²$
b.
25.98 $N/mm²$
c.
26.94 $N/mm²$
d.
105 $N/mm²$
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Which of the following are correct regarding line and staff organization? (1) Line maintain discipline,
staff provide expertise (2) Line improve the overall efficiency, staff provide stability (3) Staff are thinker,
line are doer
a.
(1), (2)
b.
(2), (3)
c.
(1), (3)
d.
(1), (2), (3)
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Which of the following statements are correct regarding theory of motivation (1) Average human
being do meaningful work (2) Satisfied person seeking to attain the goal (3) Rewards associated with
achievement leads to commitment (4) Average human avoid responsibility, less ambition
a.
(1), (2), (4)
b.
(2), (3), (4)
c.
(1), (2), (3)
d.
(3) and (4)
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In a railway marshalling yard, goods trains arrive at a rate of 30 trains per day. The inter arrival time
and the service time follows exponential distribution. The average service time is 36 minutes. The mean
queue size is
a.
0.75
b.
0.83
c.
3
d.
5
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Which of the following statements are correct regarding critical path? (1) It is longest path and
consumes maximum time (2) It is shortest path and consumes minimum time (3) It has zero float (4) The
expected completion data can be meet if even one critical activity is delayed.
a.
(2), (3) and (4)
b.
(1), (3) and (4)
c.
(2) and (3)
d.
(1) and (3)
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Match the following : (a) Fly wheel rim 1. Static balancing (b) Impeller 2. Dynamic balancing (c) Crank
shaft 3. D Alembert's principle (d) Inertia force 4. Mass moment of inertia
a.
4 1 2 3
b.
1 2 3 4
c.
4 3 2 1
d.
3 4 1 2
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In a reverted gear train with input gear 1 of T₁ teeth meshing with gear 2 of teeth T₂, output gear 4 of
teeth T₄ meshing with gear 3 of teeth T₃. Choose the correct one from the following
a.
T₂ - T₁ $=$ T₃ - T₄
b.
T₂ / T₁ $=$ T₄ / T₃
c.
T₁ + T₂ $=$ T₃ + T₄
d.
T₁ $×$ T₂ $=$ T₃ $×$ T₄
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If a lead ball within a certain velocity is made to strike a wall it does not rebound. But if a rubber ball
of same mass and velocity strikes the same wall, it rebounds. Select the correct reasons for the following
a.
The change in momentum suffered by the rubber ball is
b.
The change in momentum suffered by the lead ball is more than that of the lead ball more than that of the red ball
c.
Both (A) and (B)
d.
There is no change momentum for both the rubber ball and lead ball
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The magnitude of the gyroscopic couple applied to a disc of moment of inertia I. Spinning with
angular velocity ω and having an angular velocity precission ω_p is
a.
$I²$ ω ω_p
b.
I $ω²$ ω_p
c.
I ω $ω_p²$
d.
I ω ω_p
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The property by which the moment about a given point O of the resultant of several concurrent
forces is equal to the sum of moments of various forces about the same point O is known as
a.
Polygon law
b.
Lame's theorem
c.
Pappus-Guldinus theorem
d.
Varignon's theorem
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In a four bar linkage, S - denotes the shortest link length, L - longest link length, P and Q are the
lengths of other two links. Atleast one of the three moving links will rotate by 360° if
a.
S + L ≤ P + Q
b.
S + L > P + Q
c.
S + P ≤ L + Q
d.
S + P > L + Q
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Consider the following statements. The flow configuration in a heat exchanger whether counter flow
or otherwise, will not matter it 1. A liquid is evaporating. 2. A vapour is condensing. 3. Mass flow rate of one
of the fluids is far greater. Which of these statements correct?
a.
1 and 2
b.
1 and 3
c.
2 and 3
d.
1, 2 and 3
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Air at 20°C is flowing over a flat plate which is 200 mm and 500 mm long. The plate is maintained at
100 °C find the heat loss per hour from the plate if the air is flowing parallel to 500 mm side. With 2 m/s
velocity. The properties of air at 60 °C are v $=$ $18.97×10^{-6}$ $m^{2}/s$, k $=$ 0.025 w/m°c and pr $=$ 0.7
a.
54.14 w
b.
541.4 w
c.
5414 w
d.
5.414 w
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In a one-dimensional fin of length L with a base temperature $T_{b}$ and a convective heat transfer
coefficient h, what is the general form of the temperature distribution along the fin?
a.
Linear
b.
Exponential
c.
Quadratic
d.
Constant
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A steel rod (k $=$ 32 w/m°c), 12 mm in diameter and 60 mm long, with an insulated end, is to be used
as a spine. It is exposed to surroundings with a temperature of 60°C and h $=$ 55 $w/m^{2C}$. The temperature
at the base of fin is 95°C. Find the temperature at the edge of the spine.
a.
75.75°C
b.
76.81°C
c.
74.32°C
d.
77.41°C
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A long rod 12 mm square section made of low carbon steel protrudes into air at 35°C from a furnace
wall at 200°C. h $=$ 22 $w/m^{2k}$, K $=$ 51.9 w/mk. If length of the rod is 159 mm and is insulated at the end. The
temperature of the fin at its end is
a.
98.74°C
b.
83.72°C
c.
106.84°C
d.
80.31°C
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A thick wall tube of stainless steel with 20 mm inner diameter and 40 mm outer diameter is covered
with a 30 mm layer of asbestos insulation (K $=$ 0.2 w/m°C). If the inside wall temperature of the pipe is
maintained at 600°C and the outside insulation at 1000°C. Calculate the heat loss per metre length.
a.
- 447.28 W/m
b.
- 488.56 W/m
c.
- 522.78 W/m
d.
- 548.57 W/m
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A thermocouple junction is in the form of 8 mm diameter sphere. Properties of material are C $=$ 420 J/
kg°C; ρ $=$ 8000 $kg/m^{3}$; h $=$ 40 $w/m^{2}$ °C. Find the time constant of the thermocouple.
a.
112 S
b.
110 S
c.
108 S
d.
111 S
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Which of the following are the beneficial effects of air vessel fitted to the delivery side of a
reciprocating pump? (1) Constant rate of discharge can be ensured (2) Power consumption can be reduced
(3) Discharge can be increased (4) Constant velocity of the piston can be ensured Select the correct
answer for a reciprocating pump:
a.
(1) and (4)
b.
(1) and (2)
c.
(2) and (4)
d.
(1) and (3)
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A Pitot - Static tube is used to measure the velocity of water in a pipe. The stagnation pressure head
is 6 m and static pressure head is 5 m. Calculate the velocity of flow assuming the co-efficient of tube
equal to 0.98.
a.
43.4 m/s
b.
434.0 m/s
c.
4.34 m/s
d.
40.34 m/s
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In a typical product development process under concurrent engineering approach, all elements of
product life cycle from conception to disposal are considered at
a.
Product design stage
b.
Process design stage
c.
Manufacturing stage
d.
Disposal stage
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