Inspector of Factories • Paper-I
A Carnot cycle comprises of -
A)
two isothermal and two isentropic processes
B)
two constant volume and two isentropic processes
C)
two constant pressure and two isentropic processes
D)
one constant volume, one constant pressure and two isentropic processes
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'two constant volume and two isentropic processes' (Option B).
Inspector of Factories • Paper-I
The second law of thermodynamics deals with -
A)
direction of process and quality of energy
B)
energy balance
C)
balance of internal energy
D)
system efficiency
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'energy balance' (Option B).
Inspector of Factories • Paper-I
A fiuid is a compressible fiuid when its density -
A)
decreases with pressure
B)
increases with pressure
C)
increases with temperature
D)
both (a) & (b)
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'increases with temperature' (Option C).
Inspector of Factories • Paper-I
COP of a Carnot refrigeration cycle is greater than -
A)
vapour compression cycle
B)
reversed Brayton cycle
C)
vapour absorption cycle
D)
all the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'reversed Brayton cycle' (Option B).
Inspector of Factories • Paper-I
An adiabatic system is one in which -
A)
both energy and mass cross the boundary of the system
B)
the mass does not cross the boundary, but energy interaction takes place
C)
neither mass nor energy cross the boundary of the system
D)
mass crosses the boundary, heat energy does not cross the boundary of the system
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'the mass does not cross the boundary, but energy interaction takes place' (Option B).
Inspector of Factories • Paper-I
If a body is in stable equilibrium the metacentric height should be -
A)
zero
B)
positive
C)
negative
D)
depends on the fluid
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'positive' (Option B).
Inspector of Factories • Paper-I
The velocity profile in turbulent flow is -
A)
parabolic
B)
logarithmic
C)
2nd degree polynomial
D)
4th degree polynomial
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '4th degree polynomial' (Option D).
Inspector of Factories • Paper-I
Gases have poor -
A)
tranmissitivity
B)
absorptivity
C)
reflectivity
D)
emissivity
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'absorptivity' (Option B).
Inspector of Factories • Paper-I
In which one of the following materials, is the heat energy propagation minimum due to conduction heat transfer?
A)
Lead
B)
Copper
C)
Water
D)
Air
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Lead' (Option A).
Inspector of Factories • Paper-I
The continuity equation is the result of application of the following law to the flow field -
A)
First law of thermodynamics
B)
Conservation of energy
C)
Newton’s second law of motion
D)
Conservation of mass
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Conservation of energy' (Option B).
Inspector of Factories • Paper-I
A low specific speed Francis turbine is -
A)
Axial flow turbine
B)
tangential flow turbine
C)
Mixed flow turbine
D)
radial flow turbine
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'tangential flow turbine' (Option B).
Inspector of Factories • Paper-I
In a gas turbine plant, the intercooler is used in between -
A)
air compressor and regenerator
B)
air compressor and combustion chamber
C)
combustion chamber and turbine
D)
LP compressor and HP compressor
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'air compressor and regenerator' (Option A).
Inspector of Factories • Paper-I
Slip in the case of a centrifugal pump.
A)
Reduces the flow rate
B)
Reduces the energy transfer
C)
Reduces the speed
D)
Increases cavitation
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Increases cavitation' (Option D).
Inspector of Factories • Paper-I
Coefficient of discharge is the ratio of -
A)
Actual flow/Theoretical flow
B)
Theoretical flow/Actual flow
C)
Actual velocity/Theoretical velocity
D)
Theoretical velocity/Actual velocity
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Actual velocity/Theoretical velocity' (Option C).
Inspector of Factories • Paper-I
The efficiency of air standard Otto cycle depends on -
A)
pressure ratio in the cycle
B)
temperature ratio in the cycle
C)
Compression ratio in the cycle
D)
mean effective pressure
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Compression ratio in the cycle' (Option C).
Inspector of Factories • Paper-I
The entry length in pipe flow will be higher for -
A)
highly viscous fluids
B)
low viscosity fluid
C)
high velocity of flow
D)
small diameters
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'high velocity of flow' (Option C).
Inspector of Factories • Paper-I
Bernoulli equation is applicable for -
A)
steady rotational flow
B)
steady rotational compressible flow
C)
steady irrotational incompressible flow
D)
unsteady irrotational incompressible flow
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'steady irrotational incompressible flow' (Option C).
Inspector of Factories • Paper-I
The draught in a boiler is provided to -
A)
force the air on the furnace
B)
force the hot gases on superheater
C)
discharge the fiue gases through chimney
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).
Inspector of Factories • Paper-I
A pipeline is said to be equivalent to another, if in both -
A)
Length and discharge are the same
B)
Velocity and discharge are the same
C)
Discharge and frictional head loss are the same
D)
Length and diameter are the same
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Length and discharge are the same' (Option A).
Inspector of Factories • Paper-I
Rotameter is used to measure -
A)
Viscosity
B)
Flow
C)
Density
D)
Pressure
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Density' (Option C).
Inspector of Factories • Paper-I
By use of cooling, which efficiency of an IC engine decreases -
A)
volumetric efficiency
B)
mechanical efficiency
C)
charging efficiency
D)
thermal efficiency
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'thermal efficiency' (Option D).
Inspector of Factories • Paper-I
In an ideal vapour compression refrigeration cycle, the refrigerant is in the form of superheated vapour before entering into -
A)
condenser
B)
throttle valve
C)
evaporator
D)
compressor
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'compressor' (Option D).
Inspector of Factories • Paper-I
Nozzle efficiency is defined as the ratio of -
A)
actual enthalpy drop to isentropic enthalpy drop
B)
isentropic enthalpy drop to actual enthalpy drop
C)
product of isentropic enthalpy drop and actual enthalpy drop
D)
square root of isentropic enthalpy drop to actual enthalpy drop
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'product of isentropic enthalpy drop and actual enthalpy drop' (Option C).
Inspector of Factories • Paper-I
Assertion (A) : The leakage heat transfer from the outside surface of a steel pipe carrying hot gases is reduced to a greater extent on providing refractory brick lining on the inside of the pipe as compared to that with brick lining on the outside.
Reason (R) : The refractory brick lining on the inside of the pipe offers a higher thermal resistance.
A)
Both A and R are individually true and R is the correct explanation of A
B)
Both A and R are individually true but R is not the correct explanation of A
C)
A is true but R is false
D)
A is false but R is true
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Both A and R are individually true and R is the correct explanation of A' (Option A).
Inspector of Factories • Paper-I
Water at 25°C is flowing through a 1.0 km long G.I. pipe of 200 mm diameter at the rate of 0.07m3/s. If value of Darcy friction factor for this pipe is 0.02 and density of water is 1000 kg/m3, the pumping power (in kW) required to maintain the flow is:
A)
1.8
B)
17.4
C)
20.5
D)
41.0
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '1.8' (Option A).
