Mechanical Engineering - Online Test
Q1. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev,
depth of cut of 4 mm and cutting velocity of 90 m/min, it is observed that the
main (tangential) cutting force is perpendicular to the friction force acting at the
chip-tool interface. The main (tangential) cutting force is 1500 N.
The orthogonal rake angle of the cutting tool in degree is
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. An irreversible heat engine extracts heat from a high temperature source at a rate of 100kW and
rejects heat to a sink at a rate of 50kW. The entire work output of the heat engine is used to drive a
reversible heat pump operating between a set of independent isothermal heat reservoirs at 17oC
and 75oC. The rate (in kW) at which the heat pump delivers heat to its high temperature sink is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. A fair coin is tossed independently four times. The probability of the event “the number of time heads shown up is more than the number of times tail shown up”
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. A rod of length L having uniform cross-sectional area A is subjected to a tensile
force P as shown in the figure below. If the Young’s modulus of the material
varies linearly from E1 to E2 along the length of the rod, the normal stress
developed at the section-SS is
Answer : Option A
Explaination / Solution:
Stress depends on area.
Q5. You are asked to evaluate assorted fluid flows for their suitability in a given laboratory application.
The following three flow choices, expressed in terms of the two-dimensional velocity fields in the
x-y plane, are made available.
P. u = 2y, v = -3x; Q. u = 3xy, v = 0; R. u = -2x, v = 2y
Which flows(s) should be recommended when the application requires the flow to be
incompressible and irrotational?
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. If 
over the path shown in the figure is
over the path shown in the figure is
Answer : Option C
Explaination / Solution:
Q7. A block weighing 981 N is resting on a horizontal surface. The coefficient of friction between the
block and the horizontal surface is μ = 0.2. A vertical cable attached to the block provides partial
support as shown. A man can pull horizontally with a force of 100N. What will be the tension, T (in
N) in the cable if the man is just able to move the block to the right?
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. Water at 25oC is flowing through a 1.0 km long G.I pipe of 200mm diameter at the rate of 0.07 m3/s.
If value of Darcy friction factor for this pipe is 0.02 and density of water is 1000 kg/m3 , the
pumping power (in kW) required to maintain the flow is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9.
Consider differential equation with 
the initial condition y(0) = 0. Using Euler’s first order method with a step size of 0.1, the value of y(0.3) is
the initial condition y(0) = 0. Using Euler’s first order method with a step size of 0.1, the value of y(0.3) is
Answer : Option B
Explaination / Solution:
Taking step size h = 0.1, y(0) = 0
From table, at x = 0.3,y(x = 0.3) = 0.031
Q10. If the principal stresses in a plane stress problem, are σ1 = 100MPa, σ2 = 40MPa the magnitude
of the maximum shear stress (in MPa) will be
Answer : Option C
Explaination / Solution:
No Explaination.
