Mechanical Engineering - Online Test
Q1. Which of the following engineering materials is the most suitable candidate for
hot chamber die casting ?
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. 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
Answer : Option D
Explaination / Solution:
Since it is simply supported critical speed will be half
Q3. If a closed system is undergoing an irreversible process, the entropy of the system
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. In the Taylor series expansion of exp(x) + sin(x) about the point x = π, the coefficient of (x-π)2 is
Answer : Option B
Explaination / Solution:
Q5. Which one of the following is a solid state joining process ?
Answer : Option C
Explaination / Solution:
No Explaination.
Q6. A planar closed kinematic chain is formed with rigid links PQ = 2.0m, QR = 3.0m,
RS = 2.5m and SP = 2.7m with all revolute joints. The link to be fixed to obtain a
double rocker (rocker-rocker) mechanism is
Answer : Option C
Explaination / Solution:
Since for Rocker – Rocker mechanism the link opposite to smaller link
must be fixed
Q7. A coolant fluid at 30°C flows over a heated flat plate maintained at a constant temperature of 100°C. The boundary layer temperature distribution at a given location on the plate may be
approximated as T = 30 + 70 exp (-y) where y (in m) is the distance normal to the plate and T is
in °C. If thermal conductivity of the fluid is 1.0W/m2K, the local convective heat transfer coefficient
(in W/ K) at that location will be
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. Consider points P and Q in the x - y plane, with P = (1,0) and Q = (0,1). The line integral 
along the semicircle with the line segment PQ as
its diameter
along the semicircle with the line segment PQ as
its diameter
Answer : Option B
Explaination / Solution:
Q9. In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated
carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the
depth of cut is 2 mm. The chip thickness obtained is 0.48 mm. If the orthogonal
rake angle is zero and the principle cutting edge angle is 90o, the shear angle in
degree is
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. A compound gear train with gears P, Q, R and S has number of teeth 20, 40,
15 and 20, respectively. Gears Q and R are mounted on the same shaft as
shown in the figure below. The diameter of the gear Q is twice that of the gear
R. If the module of the gear R is 2 mm, the center distance in mm between
gears P and S is
Answer : Option B
Explaination / Solution:
