← MES Jr. Grade
Past Questions
All stresses produced in a belt are
A)
compressive stresses
B)
tensile stresses
C)
both tensile and compressive stresses
D)
shear stresses
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'shear stresses' (Option D).
Poisson’s ratio is defined as the ratio of
A)
Longitudinal stress to longitudinal strain
B)
Longitudinal stress to lateral stress
C)
Lateral strain to longitudinal strain
D)
Lateral stress to lateral strain
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Lateral strain to longitudinal strain' (Option C).
The ratio of the polar moment of inertia to the radius of the shaft is known as
A)
Shaft stiffness
B)
Flexural rigidity
C)
Torsional rigidity
D)
Torsional section modulus
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Torsional section modulus' (Option D).
Sensitivity of a governor is defined as the ratio of
A)
Effort of governor to its speed range
B)
Mean speed to speed range of governor
C)
Maximum to minimum speed of governor
D)
Speed range to mean speed of the governor
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Effort of governor to its speed range' (Option A).
A composite shaft consist of two stepped portions with spring constants K1 and K2 respectively. If the shaft is held between two rigid support at ends, the equivalent spring constant will be
A)
(K1 + K2)/2
B)
K1 K2 / (K1 + K2)
C)
(K1 + K2)
D)
K1 K2
Based on established principles in the relevant subject area, the correct and most appropriate choice is '(K1 + K2)' (Option C).
The rolling contact bearings are known as
A)
thick lubricated bearings
B)
plastic bearings
C)
thin lubricated bearings
D)
antifriction bearings
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'plastic bearings' (Option B).
The ends of leaves of a semi-elliptical leaf spring are made triangular in plan in order to
A)
obtain variable moment of inertia I in each leaf
B)
Permit each leaf to act as a overhanging beam
C)
Have variable bending moment M in each leaf
D)
make M/I constant throughout the length of leaf
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'make M/I constant throughout the length of leaf' (Option D).
A key made from a cylindrical disc having segmental cross-section, is known as
A)
feather key
B)
gib head key
C)
woodruff key
D)
flat saddle key
Option C: woodruff key. This matches the standard definition or established fact for the concept asked.
The gears are termed as medium velocity gears, if their peripheral velocity is
A)
1–3 m / s
B)
3–15 m / s
C)
15–30 m / s
D)
30–50 m / s
Based on established principles in the relevant subject area, the correct and most appropriate choice is '15–30 m / s' (Option C).
In a solid arch, shear force acts
A)
Vertically upwards
B)
Along the axis of the arch
C)
Perpendicular to the axis of the arch
D)
tangentially to the arch
Option C: Perpendicular to the axis of the arch. This matches the standard definition or established fact for the concept asked.
A jaw clutch is essentially a
A)
positive action clutch
B)
cone clutch
C)
friction clutch
D)
disc clutch
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'cone clutch' (Option B).
The type of stresses developed in the key is/are
A)
shear stress alone
B)
bearing stress alone
C)
both shear and bearing stresses
D)
shearing, bearing and bending stresses
Option C: both shear and bearing stresses. This matches the standard definition or established fact for the concept asked.
In thrust bearings, the load acts
A)
along the axis of rotation
B)
parallel to the axis of rotation
C)
perpendicular to the axis of rotation
D)
in any direction
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'parallel to the axis of rotation' (Option B).
Lewis equation in spur gears is applied
A)
only to the pinion
B)
only to the gear
C)
to stronger of the pinion or gear
D)
to weaker of the pinion or gear
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'to weaker of the pinion or gear' (Option D).
The centrifugal tension in the belt
A)
increases the power transmitted
B)
decreases the power transmitted
C)
has no effect on the power transmitted
D)
is equal to maximum tension on the belt
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'is equal to maximum tension on the belt' (Option D).
Oldham coupling is used to connect two shafts
A)
which are perfectly aligned
B)
which are not in exact alignment
C)
which have lateral misalignment
D)
whose axes intersect at a small angle
Option C: which have lateral misalignment. This matches the standard definition or established fact for the concept asked.
A screw is said to be self-locking screw, if its efficiency is
A)
less than 50%
B)
more than 50%
C)
equal to 50%
D)
none of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'equal to 50%' (Option C).
Module of a gear is
A)
The ratio of pitch circle diameter to the number of teeth
B)
The ratio of number of teeth to pitch circle diameter
C)
The reciprocal of pitch circle diameter
D)
The product of pitch circle diameter and the number of teeth
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'The product of pitch circle diameter and the number of teeth' (Option D).
Lewis equation in spur gears is used to find the
A)
tensile stress in bending
B)
shear stress
C)
compressive stress in bending
D)
fatigue stress
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'tensile stress in bending' (Option A).
The design of shafts made of brittle materials is based on
A)
Guest’s theory
B)
Rankine’s theory
C)
St. Venant’s theory
D)
Von Mises Theory
Option B: Rankine’s theory. This matches the standard definition or established fact for the concept asked.
Screws used for power transmission should have
A)
low efficiency
B)
high efficiency
C)
very fine threads
D)
strong teeth
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'very fine threads' (Option C).
Which of the following screw thread is adopted for power transmission in either direction?
A)
Acme threads
B)
Square threads
C)
Buttress threads
D)
Multiple threads
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Buttress threads' (Option C).
The cone clutches have become obsolete because of
A)
small cone angles
B)
exposure to dirt and dust
C)
difficulty in disengaging
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).
Which of the following is a positive drive:
A)
Crossed flat belt drive
B)
Crossed V-belt drive
C)
Rope drive
D)
Chain drive
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Chain drive' (Option D).
According to the law of gearing
A)
Teeth should be cut with a cutter having the same module
B)
minimum clearance should be 0.15 mm
C)
The common normal at the point of contact between a pair of teeth always passes through the pitch point
D)
Arc of approach equals the arc of recess
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Arc of approach equals the arc of recess' (Option D).