MES Jr. Grade • Paper-I
Depending on the radiating properties, a body will be opaque when (where a = absorptivity, p = reflectivity, x = transmissivity)
A)
p = 0, x = 0 and a = 1
B)
p = 1, x = 0 and a = 0
C)
p = 0, x = 1 and a = 0
D)
x = 0, a + p = 1
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'p = 0, x = 0 and a = 1' (Option A).
MES Jr. Grade • Paper-I
Joule sec is the unit of
A)
Universal gas constant
B)
Kinematic viscosity
C)
Thermal conductivity
D)
Planck’s constant
Based on established principles in General Knowledge (unspecific), the correct and most appropriate choice is 'Universal gas constant' (Option A).
MES Jr. Grade • Paper-I
An ordinary passenger aircraft requires a cooling system of capacity.
A)
2 TR
B)
4 TR
C)
8 TR
D)
10 TR
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '4 TR' (Option B).
MES Jr. Grade • Paper-I
Vapor quality is an
A)
Extensive property
B)
Intensive property
C)
Extensive & Intensive property
D)
None of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'None of these' (Option D).
MES Jr. Grade • Paper-I
The volumetric efficiency for reciprocating air compressors is about
A)
10 to 40%
B)
40 to 60%
C)
60 to 70%
D)
70 to 90%
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '10 to 40%' (Option A).
MES Jr. Grade • Paper-I
Unit of flow resistance is
A)
N/m2
B)
m2/N
C)
kN/kg
D)
No unit
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'kN/kg' (Option C).
MES Jr. Grade • Paper-I
The maximum delivery pressure in a rotary air compressor is
A)
10 bar
B)
20 bar
C)
30 bar
D)
50 bar
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '50 bar' (Option D).
MES Jr. Grade • Paper-I
A piston-cylinder device initially contains air at 150 kPa and 27°C. At this state, the volume is 400 litre. The mass of the piston is such that a 350 kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine the total heat transferred to the air.
A)
747 kJ
B)
757 kJ
C)
767 kJ
D)
777 KJ
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '747 kJ' (Option A).
MES Jr. Grade • Paper-I
The stagnation pressure rise in a centrifugal compressor takes place
A)
In the diffuser only
B)
In the impeller only
C)
In the diffuser and impeller
D)
In the inlet guide vanes only
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'In the diffuser only' (Option A).
MES Jr. Grade • Paper-I
Cavitation is caused by
A)
high velocity
B)
low pressure
C)
weak material
D)
high pressure
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'high pressure' (Option D).
MES Jr. Grade • Paper-I
The rate of energy transferred by convection to that by conduction is called
A)
Stanton number
B)
Nusselt number
C)
Biot number
D)
Peclet number
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Stanton number' (Option A).
MES Jr. Grade • Paper-I
The fluid forces considered in the Navier Stokes equation are
A)
gravity, pressure and viscous
B)
gravity, pressure and turbulent
C)
viscous, pressure and viscous
D)
gravity, turbulent and viscous
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'gravity, pressure and turbulent' (Option B).
MES Jr. Grade • Paper-I
Specific volume of steam is __________ to dryness faction at given temperature.
A)
Not related
B)
Indirectly proportional
C)
Directly proportional
D)
equal to
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'equal to' (Option D).
MES Jr. Grade • Paper-I
Coefficient of discharge is
A)
Directly proportional to coefficient of discharge
B)
Inversely proportional to square of the coefficient of discharge
C)
Inversely proportional to coefficient of discharge
D)
Directly proportional to square of coefficient of discharge
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Directly proportional to square of coefficient of discharge' (Option D).
MES Jr. Grade • Paper-I
The product of Reynolds number and Prandtl number is known as
A)
Stanton number
B)
Biot number
C)
Peclet number
D)
Grashoff number
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Biot number' (Option B).
MES Jr. Grade • Paper-I
A composite wall has two layers of different materials having thermal conductivities of k1 and k2. If each layer has the same thickness, the equivalent thermal conductivity of the wall is
A)
(k1 + k2) / 2
B)
2k1k2 / (k1 + k2)
C)
k1 + k2
D)
(k1 + k2) / 2
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '(k1 + k2) / 2' (Option D).
MES Jr. Grade • Paper-I
For a hypersonic flow, the mach number is
A)
unity
B)
greater than unity
C)
greater than 2
D)
greater than 4
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'greater than unity' (Option B).
MES Jr. Grade • Paper-I
The work done by a closed system in a reversible process is always __________ that done in an irreversible process.
A)
less than or more than
B)
equal to
C)
less than
D)
more than
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'more than' (Option D).
MES Jr. Grade • Paper-I
If R is the Reynold’s number, the coefficient of friction for laminar flow is
A)
4/Re
B)
8/Re
C)
12/Re
D)
16/Re
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '8/Re' (Option B).
MES Jr. Grade • Paper-I
The total energy developed by the hydraulic oil in a system is given as
A)
Total energy = (Potential energy + Pressure energy)
B)
Total energy = (Potential energy + Kinetic energy)
C)
Total energy = (Potential energy – Kinetic energy)
D)
None of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'None of these' (Option D).
MES Jr. Grade • Paper-I
In a four stroke cycle petrol engine, the compression
A)
Starts at 40° after bottom dead centre and ends at 30° before top dead centre
B)
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
C)
Starts at bottom dead centre and ends at top dead centre
D)
May start and end anywhere
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre' (Option B).
MES Jr. Grade • Paper-I
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water
A)
51 cm
B)
50 cm
C)
52 cm
D)
52.2 cm
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '52 cm' (Option C).
MES Jr. Grade • Paper-I
Choose the correct statement among the following:
A)
Temperature is an extensive property
B)
Mass remains same in an open system
C)
The system boundaries are collapsible and expandable
D)
An isolated system allows exchange of energy in the form of heat only
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Mass remains same in an open system' (Option B).
MES Jr. Grade • Paper-III
Line balancing is carried out to
A)
minimise the idle items
B)
optimise no. of lines in network
C)
balance the level of outgoing product against the level of incoming raw material
D)
decide the type of plant layout
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'minimise the idle items' (Option A).
MES Jr. Grade • Paper-III
Production of an enterprise refers to
A)
yearly gross income
B)
rate of growth of capital
C)
turnover in a specified period
D)
the ratio of gross income to gross expenditure
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'rate of growth of capital' (Option B).
