Question Paper for DMRC J.E Mechanical Engineering

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[Arun Vats]

As you want to get DMRC J.E mechanical engineering paper so here I am giving you some questions of that paper:

In PERT analysis a critical activity has
A) maximum Float
B) zero Float
C) maximum Cost
D) minimum Cost
Answer : (B)

Environment friendly refrigerant R134a is used in the new generation domestic refrigerators. Its chemical formula is
A) CH C1 F2
B) C2 C13 F3
C) C2 C12 F4
D) C2 H2 F
4 Answer : (D)

The S-N curve for steel becomes asymptotic nearly at
A) 103 cycles
B) 104 cycles
C) 106 cycles
D) 109 cycles
Answer : (C)

In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be
A) 5 mm
B) 39 mm
C) 78mm
D) 120mm
Answer : (A)

The angle between two unit-magnitude coplanar vectors P(0.866, 0.500,0) and Q(0.259, 0.966,0) will be
A) 0° B) -30°
C) 45°
D) 60°
Answer : (C)

15 A lot has 10% defective items. Ten items are chosen randomly from this lot. The probability that exactly 2 of the chosen items are defective is
A) 0.0036
B) 0.1937
C) 0.2234
D) 0.3874
Answer : (B)

the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be
A) circular Interpolation — clockwise
B) circular Interpolation — counterclockwise
C) linear Interpolation
D) rapid feed
Answer : (A)

In an interchangeable assembly, shafts of size 25.000+0.040mm mate with holes of size 25.000+0.020 mm. The maximum possible clearance in the assembly will be
A) 10 microns
B) 20 microns
C) 30 microns
D) 60 microns
Answer : (D)

S-N curve for steel becomes asymptotic nearly at
A) 103 cycles
B) 104 cycles
C) 10 6 cycles
D) 10 9 cycles
Answer : (C)

A metric thread of pitch 2 mm and thread angle 60° is inspected for its pitch diameter using 3-wire
method. The diameter of the best size wire in mm is
(A) 0.866 (B) 1.000 (C) 1.154 (D) 2.000

Customers arrive at a ticket counter at a rate of 50 per hr and tickets are issued in the order of their
arrival. The average time taken for issuing a ticket is 1 min. Assuming that customer arrivals form a
Poisson process and service times are exponentially distributed, the average waiting time in queue
in min is
(A) 3 (B) 4 (C) 5 (D) 6

In simple exponential smoothing forecasting, to give higher weightage to recent demand
information, the smoothing constant must be close to
(A) -1 (B) zero (C) 0.5 (D) 1.0

A steel bar 200 mm in diameter is turned at a feed of 0.25 mm/rev with a depth of cut of 4 mm. The
rotational speed of the workpiece is 160 rpm. The material removal rate in mm3/s is
(A) 160 (B) 167.6 (C) 1600 (D) 1675.5

A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same
material, which is 8 times heavier than the original casting, will be
(A) 10 (B) 20 (C) 24 (D) 40

For a ductile material, toughness is a measure of
(A) resistance to scratching (B) ability to absorb energy up to fracture
(C) ability to absorb energy till elastic limit (D) resistance to indentation

In order to have maximum power from a Pelton turbine, the bucket speed must be
(A) equal to the jet speed. (B) equal to half of the jet speed.
(C) equal to twice the jet speed. (D) independent of the jet speed.

Consider one-dimensional steady state heat conduction along x-axis (0 ≤ x ≤ L), through a plane
wall with the boundary surfaces (x=0 and x=L) maintained at temperatures of 0°C and 100°C. Heat
is generated uniformly throughout the wall. Choose the CORRECT statement.
(A) The direction of heat transfer will be from the surface at 100°C to the surface at 0°C.
(B) The maximum temperature inside the wall must be greater than 100°C.
(C) The temperature distribution is linear within the wall.
(D) The temperature distribution is symmetric about the mid-plane of the wall.

A cylinder contains 5 m3 of an ideal gas at a pressure of 1 bar. This gas is compressed in a
reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this
process is
(A) 804.7 (B) 953.2 (C) 981.7 (D) 1012.2

A long thin walled cylindrical shell, closed at both the ends, is subjected to an internal pressure.
The ratio of the hoop stress (circumferential stress) to longitudinal stress developed in the shell is
(A) 0.5 (B) 1.0 (C) 2.0 (D) 4.0

If two nodes are observed at a frequency of 1800 rpm during whirling of a simply supported long
slender rotating shaft, the first critical speed of the shaft in rpm is
(A) 200 (B) 450 (C) 600 (D) 900

A planar closed kinematic chain is formed with rigid links PQ = 2.0 m, QR = 3.0 m, RS = 2.5 m
and SP = 2.7 m with all revolute joints. The link to be fixed to obtain a double rocker (rockerrocker)
mechanism is
(A) PQ (B) QR (C) RS (D) SP

Let X be a normal random variable with mean 1 and variance 4. The probability P{X < 0} is
(A) 0.5 (B) greater than zero and less than 0.5
(C) greater than 0.5 and less than 1.0 (D) 1.0

Choose the CORRECT set of functions, which are linearly dependent.
(A) x sin , 2 sin x and 2 cos x (B) cos x , x sin and x tan
(C) cos 2x , 2 sin x and 2 cos x (D) cos 2x , x sin and x cos