Mechanical Engineering - Online Test
Q1. The non-traditional machining process that essentially
requires vacuum is
Answer : Option A
Explaination / Solution:
In electron- beam machining, vacuum conditions are
created/required for material removal, because electrons move
efficiently in vacuum.
Q2. We have a set of 3 linear equations in 3 unknowns.
means X and Y are
equivalent statements and 
means X and Y are not equivalent statements.
means X and Y are
equivalent statements and means X and Y are not equivalent statements. P: There is a unique solution.
Q: The equations are linearly independent.
R: All eigenvalues of the coefficient matrix are nonzero.
S: The determinant of the coefficient matrix is nonzero.
Which one of the following is TRUE?
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. Two coins R and S are tossed. The 4 joint events HRHS,
TR TS,HR TS,TR HS have
probabilities 0.28, 0.18, 0.30, 0.24, respectively, where H represents head and T
represents tail. Which one of the following is TRUE?
Answer : Option D
Explaination / Solution:
Q4. A 1 kg block is resting on a surface with coefficient of friction µ = 0.1. A force of
0.8N is applied to the block as shown in figure. The friction force is
Answer : Option B
Explaination / Solution:
Limiting friction force between the block and the surface is 0.98N. But the
applied force is 0.8N which is less than the limiting friction force. Therefore the
friction force for the given case is 0.8N.
Q5. The emissive power of a blackbody is P. If its absolute temperature is doubled, the emissive
power becomes.
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. Match the following:
P. Feeler gauge I. Radius of an object
Q. Fillet gauge II. Diameter within limits by comparison
R. Snap gauge III. Clearance or gap between components
S. Cylindrical plug gauge IV. Inside diameter of straight hole
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. The z-Transform of a sequence x[n] is given as X(z) = 2z+4-4/z+3z2. If y[n] is the first
difference of x[n], then Y(z) is given by
Answer : Option A
Explaination / Solution:
y(n) is first difference of x(n) So
g(n)=x(n)-x(n-1)
Q8. A single–point cutting tool with 12o rake angle is used to machine a steel work–
piece. The depth of cut, i.e. uncut thickness is 0.81mm. The chip thickness under
orthogonal machining condition is 1.8mm. The shear angle is approximately
Answer : Option B
Explaination / Solution:
Relation between shear angle (φ), chip thickness ratio (r) and rake angle (α) is given by
Q9. Which one of the following statement is TRUE?
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. A cube shaped casting solidifies in 5 minutes. The solidification time in minutes for a cube of the same material, which is 8 times heavier than the original casting will be
Answer : Option B
Explaination / Solution:
