Legal Metrology • Paper-I
Stoichiometric air–fuel ratio of petrol is roughly
A)
50 : 1
B)
25 : 1
C)
15 : 1
D)
1 : 1
Based on established principles in the relevant subject area, the correct and most appropriate choice is '15 : 1' (Option C).
Legal Metrology • Paper-I
In a dry evaporator, refrigerant at the outlet is
A)
in the wet state
B)
saturated state
C)
super-heated state
D)
None
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'saturated state' (Option B).
Legal Metrology • Paper-I
The two important forces for a floating body are
A)
buoyancy, gravity
B)
buoyancy, pressure
C)
buoyancy, inertial
D)
inertial, gravity
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'buoyancy, gravity' (Option A).
Legal Metrology • Paper-I
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
A)
one dimensional flow
B)
uniform flow
C)
steady flow
D)
turbulent flow
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'one dimensional flow' (Option A).
Legal Metrology • Paper-I
Which of the variable controls the physical properties of a perfect gas?
A)
pressure
B)
temperature
C)
volume
D)
all of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'all of these' (Option D).
Legal Metrology • Paper-I
Cavitation is caused by
A)
high pressure
B)
high velocity
C)
low pressure
D)
weak material
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'weak material' (Option D).
Legal Metrology • Paper-I
Shape factor for plane wall is equal to
A)
A/d
B)
2A/d
C)
3A/d
D)
4A/d
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '4A/d' (Option D).
Legal Metrology • Paper-I
Gas turbines are suitable for aircraft propulsion because
A)
Gas turbines are light weight
B)
Gas turbines are compact in size
C)
Gas turbines have a high power to weight ratio
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).
Legal Metrology • Paper-I
The mass transfer rate is independent of
A)
Turbulence effect
B)
Physical properties
C)
Chemical properties
D)
none of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Turbulence effect' (Option A).
Legal Metrology • Paper-I
Heat transfer takes place as per -
A)
zeroth law of thermodynamics
B)
first law of thermodynamic
C)
second law of the thermodynamics
D)
Kirchoff’s law
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'second law of the thermodynamics' (Option C).
Legal Metrology • Paper-I
Metals are good conductors of heat because
A)
their atoms collide frequently
B)
their atoms-are relatively far apart
C)
they contain free electrons
D)
they have high density
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'they contain free electrons' (Option C).
Legal Metrology • Paper-I
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
A)
O2, N2, steam, CO2
B)
O2, N2, water vapour
C)
SO2, NH3, CO2, moisture
D)
O2, N2, H2, air
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'O2, N2, H2, air' (Option D).
Legal Metrology • Paper-I
Equivalent evaporation is the amount of water evaporated in a boiler from and at
A)
0°C
B)
100°C
C)
saturation temperature at given pressure
D)
room temperature
Equivalent evaporation is referenced to water at 100°C and atmospheric pressure.
Legal Metrology • Paper-I
The volatile petroleum fuels of high octane number, pre-ignition is reduced at ________ mixture
A)
Very rich
B)
Very lean
C)
Equal
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).
Legal Metrology • Paper-I
On a psychrometric chart cooling and humidification process using spray can be shown by
A)
horizontal line
B)
vertical line
C)
line parallel to dry bulb temperature lines
D)
line parallel to wet bulb temperature lines
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'line parallel to wet bulb temperature lines' (Option D).
Legal Metrology • Paper-I
For charging a tank
A)
Enthalpy is converted to work done
B)
Work done is converted to enthalpy
C)
Enthalpy is converted to internal energy
D)
Internal energy is converted to work done
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Internal energy is converted to work done' (Option D).
Legal Metrology • Paper-I
Temperature of a gas is produced due to
A)
Its heating value
B)
Kinetic energy of molecules
C)
Repulsion of molecules
D)
Attraction of molecules
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Attraction of molecules' (Option D).
Legal Metrology • Paper-I
During a refrigeration cycle, heat is rejected by the refrigerant in a
A)
condenser
B)
compressor
C)
evaporator
D)
expansion valve
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'evaporator' (Option C).
Legal Metrology • Paper-I
Separation of flow occurs when pressure gradient
A)
becomes negative
B)
changes abruptly
C)
tends to approach zero
D)
reduces to a value when vapor formation starts
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'becomes negative' (Option A).
Legal Metrology • Paper-I
As an incompressible fluid moves through a restriction,
A)
Velocity decreases and pressure increases
B)
Velocity increases and pressure increases
C)
Velocity increases and pressure remains the same
D)
Velocity decreases and pressure remains the same
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Velocity decreases and pressure remains the same' (Option D).
Legal Metrology • Paper-I
The region between the separation streamline and the boundary surface of the solid body is known as
A)
wake
B)
drag
C)
lift
D)
boundary layer
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'boundary layer' (Option D).
Legal Metrology • Paper-I
The fluid forces considered in the Navier Stokes equation are
A)
gravity, pressure and viscous
B)
gravity, pressure and turbulent
C)
pressure, viscous and turbulent
D)
gravity, viscous and turbulent
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'gravity, pressure and turbulent' (Option B).
Legal Metrology • Paper-I
Viscous forces are not present in
A)
rotational flow
B)
irrotational flow
C)
laminar flow
D)
none of the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'irrotational flow' (Option B).
Legal Metrology • Paper-I
Thermal diffusivity is
A)
a dimensionless parameter
B)
function of temperature
C)
used as mathematical model
D)
a physical property of the material
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'used as mathematical model' (Option C).
Legal Metrology • Paper-I
A control mass gives out 10 kJ of energy in the form of heat transfer at 500°C. Find the change in availability of the control mass
A)
-4.14 kJ
B)
-5.14 kJ
C)
-6.14 kJ
D)
-7.14 kJ
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '-7.14 kJ' (Option D).
