← MES Jr. Grade
Past Questions
The tool life increases with
A)
increase in side cutting edge angle
B)
decrease in side rake angle
C)
decrease in nose angle
D)
decrease in back rake angle
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'increase in side cutting edge angle' (Option A).
In oxidizing flame, the inner core attains a temperature of
A)
2100 °C
B)
2800 °C
C)
3150 °C
D)
3500 °C
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '3500 °C' (Option D).
Chills are used in casting moulds to
A)
achieve directional solidification
B)
reduce possibility of blow hole
C)
reduce the freezing time
D)
increase the smoothness of cast surface
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'achieve directional solidification' (Option A).
In CNC machine tool, the part program entered into the computer memory
A)
can be used only once
B)
can be used again and again
C)
can be used again but it has to be modified every time
D)
cannot say
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'can be used again but it has to be modified every time' (Option C).
In Electron beam machining, workpiece is held in
A)
vacuum chamber
B)
dielectric medium
C)
electrolyte
D)
none of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'vacuum chamber' (Option A).
Size of shaper is given by
A)
stroke length
B)
motor power
C)
weight of the machine
D)
rate size
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'weight of the machine' (Option C).
Sharing of electrons between neighboring atoms results in
A)
metallic bond
B)
ionic bond
C)
covalent bond
D)
none of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'ionic bond' (Option B).
Pearlite phase in steel is made up of
A)
alternate layers of martensite and cementite
B)
alternate layers of ferrite and cementite
C)
alternate layers of ferrite and martensite
D)
alternate layers of bainite and cementite
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'alternate layers of ferrite and cementite' (Option B).
In breakeven analysis, total cost consists of
A)
fixed cost + sales revenue
B)
variable cost + sales revenue
C)
fixed cost + variable cost
D)
fixed cost + variable cost + profit
Based on established principles in Indian Economy, the correct and most appropriate choice is 'variable cost + sales revenue' (Option B).
Only two perpendicular components of cutting force act on the tool in case of
A)
Oblique cutting
B)
Orthogonal cutting
C)
3D cutting
D)
Inclined cutting
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Orthogonal cutting' (Option B).
Size of shaper is generally given by
A)
stroke length
B)
motor power
C)
weight of the machine
D)
rate size
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'stroke length' (Option A).
Indexing is accomplished by using a special attachment known as
A)
dividing head
B)
index head
C)
both dividing head and index head
D)
none of the mentioned
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'none of the mentioned' (Option D).
Encoder is used in CNC machine tool, to sense and control
A)
Spindle speed
B)
Spindle position
C)
Table position
D)
All of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'All of these' (Option D).
PERT requires
A)
single time estimate
B)
double time estimate
C)
triple time estimate
D)
none of these
Based on established principles in Management & Public Administration, the correct and most appropriate choice is 'double time estimate' (Option B).
Which of the following motion does a milling machine has?
A)
vertical motion
B)
crosswise motion
C)
longitudinal motion
D)
all of the mentioned
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'crosswise motion' (Option B).
Composite materials are
A)
made mainly to improve temperature resistance.
B)
used for improved optical properties.
C)
made with strong fibers embedded in weaker and softer matrix to obtain strength better than strength of matrix.
D)
made with strong fibers embedded in weaker and softer matrix to obtain strength better than strength of both matrix and filler.
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'made with strong fibers embedded in weaker and softer matrix to obtain strength better than strength of both matrix and filler.' (Option D).
To accurately cut gears operating at velocities upto 20m/s, the velocity factor is equal to
A)
3/ (3+v)
B)
6/ (6+v)
C)
9/ (9+v)
D)
4.58/ (4.58+v)
Based on established principles in the relevant subject area, the correct and most appropriate choice is '4.58/ (4.58+v)' (Option D).
In A-B-C analysis, which class of items are generally large in number?
A)
A
B)
B
C)
C
D)
none of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'C' (Option C).
Which of the following dividing head is also known as simple dividing head?
A)
plain dividing head
B)
universal dividing head
C)
optical dividing head
D)
all of the mentioned
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'all of the mentioned' (Option D).
PERT analysis is based upon
A)
optimistic time
B)
pessimistic time
C)
most likely time
D)
all of these
Based on established principles in Management & Public Administration, the correct and most appropriate choice is 'all of these' (Option D).
The difference between the upper limit and lower limit of a dimension is known as
A)
Basic size
B)
Nominal size
C)
Tolerance
D)
Actual size
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Nominal size' (Option B).
Part-programming mistakes can be avoided in
A)
NC (Numerical Control) machine tool
B)
CNC (Computer Numerical Control) machine tool
C)
Both (a) & (b)
D)
None of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'None of these' (Option D).
Weld spatter refers to
A)
Welding electrode
B)
Flux
C)
Filler Material
D)
Welding defect
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Filler Material' (Option C).
The spring index for valve spring is usually
A)
6
B)
8
C)
10
D)
12
The spring index is the ratio of mean coil diameter to wire diameter (C = D/d). For valve springs, a moderate spring index is usually preferred to balance manufacturability, stress concentration, and fatigue life. The commonly used value is about 8, so option (b) is correct. Option (a) 6 is too low and makes the spring too tight with higher stress concentration; options (c) 10 and (d) 12 are higher than usual and can make the spring more flexible but less compact and may increase buckling/space issues in valve applications.
If a rigid body is in equilibrium under the action of three forces, then
A)
these forces are equal
B)
these forces are not equal
C)
the lines of action of these forces are parallel
D)
none of these
For a rigid body to be in equilibrium under three forces, the forces must satisfy both force and moment equilibrium. In general, three forces in equilibrium must be either concurrent or all parallel, and their vector sum must be zero. However, the statement given in the options is incomplete: the forces need not be equal, and their lines of action need not always be parallel. Therefore, none of the listed statements is universally true.
Why the other options are incorrect:
- a) "these forces are equal" — Not necessarily. Three forces can be in equilibrium with different magnitudes, provided they balance vectorially.
- b) "these forces are not equal" — Also not necessarily true, because they may be equal in special cases (e.g., three equal forces at 120° to each other).
- c) "the lines of action of these forces are parallel" — This is only one possible case, not a general requirement. Three forces in equilibrium may be concurrent instead.
Hence, the correct answer is d) none of these.