|
| Sample Paper |
| |
| Mechnical Engineering Sample
Papers |
1 In PERT analysis a critical activity
has
A) maximum Float
B) zero
Float
C) maximum Cost
D) minimum
Cost
Answer : (B)
2
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
F4
Answer : (D)
3 A solid
cylinder (surface 2) is located at the centre of
a hollow sphere (surface 1). The diameter of the
sphere is 1m, while the cylinder has a diameter
and length of 0.5 m each. The radiation
configuration factor F11 is
A)
0.375
B) 0.625
C) 0.75
D)
1
Answer : (C)
4 For a fluid
flow through a divergent pipe of length L having
inlet and outlet radii of R1 and R2 respectively
and a constant flow rate of Q, assuming the
velocity to be axial and uniform at any
cross-section, the acceleration at the exit
is
A) 2Q(R1 - R2) p LR23
B) 2Q2 (R1 -
R2) p LR23
C) 2Q2 (R1 - R2) p2LR25
D) 2Q2
(R2 - R1) p2LR25
Answer : (C)
A D V E R T I S E M E N T
5 An incompressible fluid
(kinematic viscosity, 7.4 x 10-7 m2/s, specific
gravity, 0.88) is held between two parallel
plates. If the top plate is moved with a
velocity of 0.5 m/s while the bottom one is held
stationary, the fluid attains a linear velocity
profile in the gap of 0.5 mm between these
plates; the shear stress in Pascals on the
surface of top plate is
A) 0.651 x
10-3
B) 0.651
C) 6.51
D) 0.651 x
103
Answer : (B)
6 The tool
of an NC machine has to move along a circular
arc from (5,5) to (10,10) while performing an
operation. The centre of the arc is at (10,5).
Which one of the following NC tool path commands
performs the above mentioned
operation?
A) N010 G02 X10 Y10 X5 Y5 R5
B) N010 G03 X10 Y10 X5 Y5 R5
C) N010 G01
X5 Y5 X10 Y10 R5
D) N010 G02 X5 Y5 X10 Y10
R5
Answer : (D)
7 During a
Morse test on a 4 cylinder engine, the following
measurements of brake power were taken at
constant speed.
All cylinders firing 3037
kW
Number 1 cylinder not firing 2102
kW
Number 2 cylinder not firing 2102
kW
Number 3 cylinder not firing 2100
kW
Number 4 cylinder not firing 2098
kW
The mechanical efficiency of the engine
is
A) 91.53%
B) 85.07%
C) 81.07%
D) 61.22%
Answer : (C)
8
In terms of theoretical stress concentration
factor (Kt) and fatigue stress concentration
factor (Kf ), the notch sensitivity ‘q’ is
expressed as
A) (Kf -1) (Kt -1)
B) (Kf
-1) (Kt +1)
C) (Kt -1) (Kf -1)
D) (Kf +1)
(Kt +1)
Answer : (A)
9
Starting from x0 = 1, one step of Newton-Raphson
method in solving the equation x3 + 3x -7 = 0
gives the next value (x1) as
A) x1 =
0.5
B) x1= 1.406
C) x1= 1.5
D) x1 =
2
Answer : (C)
10 A
maintenance service facility has Poisson arrival
rates, negative exponential service time and
operates on a ‘first come first served’ queue
discipline. Break downs occur on an average of 3
per day with a range of zero to eight. The
maintenance crew can service an average of 6
machines per day with a range of zero to seven.
The mean waiting time for an item to be serviced
would be
A) 16 day
B) 13 day
C) 1
day
D) 3 days
Answer :
(A)
11 The S-N curve for steel
becomes asymptotic nearly at
A) 103
cycles
B) 104 cycles
C) 106 cycles
D)
109 cycles
Answer : (C)
12
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)
13 Water
at 42°C is sprayed into a stream of air at
atmospheric pressure, dry bulb temperature of
40°C and a wet bulb temperature of 20°C. The air
leaving the spray humidifier is not saturated.
Which of the following statements is
true?
A) Air gets cooled and
humidified
B) Air gets heated and
humidified
C) Air gets heated and
dehumidified
D) Air gets cooled and
dehumidified
Answer : (B)
14
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)
|
|