Mechanical Engineering - Online Test
Q1. Consider a single degree-of-freedom system with viscous damping excited by a harmonic
force. At resonance, the phase angle (in degree) of the displacement with respect to the
exciting force is
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. The process utilizing mainly thermal energy for removing material is
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. The matrix 
is decomposed into a product of a lower triangular
matrix [L] and an upper triangular matrix [U]. The properly decomposed [L] and
[U] matrices respectively are
is decomposed into a product of a lower triangular
matrix [L] and an upper triangular matrix [U]. The properly decomposed [L] and
[U] matrices respectively are
Answer : Option D
Explaination / Solution:
[A] = [L][U] Option D is correct
Q4. 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
Answer : Option D
Explaination / Solution:
f × d × v
Q5. A mass m1 of 100 kg travelling with a uniform velocity of 5 m/s along a line collides with a
stationary mass m2 of 1000 kg. After the collision, both the masses travel together with the
same velocity. The coefficient of restitution is
Answer : Option D
Explaination / Solution:
Q6. A minimal spanning tree in network flow models involves
Answer : Option B
Explaination / Solution:
A path forms a loop or cycle if it connects a node itself. A spanning tree links all the nodes of
network with no loops allowed.
Q7. The two vectors [1,1,1] and [1, a, a2], where a = 
, are
, are
Answer : Option B
Explaination / Solution:
Dot product of two vectors = 1 + a + a2 = 0
So orthogonal
Q8. Which one of following is NOT correct?
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Consider a long cylindrical tube of inner and outer radii, ri and ro, respectively, length, L
and thermal conductivity, k. Its inner and outer surfaces are maintained at Ti and To,
respectively (Tii > To). Assuming one-dimensional steady state heat conduction in the
radial direction, the thermal resistance in the wall of the tube is
Answer : Option C
Explaination / Solution:
Q10. Match the casting defects (Group A) with the probable causes (Group B):
Group A Group B
(p) Hot tears 1: Improper fusion of two streams of liquid metal
(q) Shrinkage 2: Low permeability of the sand mould
(r) Blow holes 3: Volumetric contraction both in liquid and solid stage
(s) Cold Shut 4: Differential cooling rate
Answer : Option B
Explaination / Solution:
No Explaination.
