← Inspector of Factories
Past Questions
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).
A Pelton wheel is ideally suited for
A)
High head and low discharge
B)
High head and high discharge
C)
Low head and low discharge
D)
Medium head and medium discharge
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'High head and low discharge' (Option A).
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).
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).
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).
Upto the critical radius of insulation:
A)
Added insulation increases heat loss
B)
Added insulation decreases heat loss
C)
Convection heat loss is less than conduction heat loss
D)
Heat flux decreases
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Heat flux decreases' (Option D).
Which one of following is a governing method used on petrol engines?
A)
Quality governing
B)
Quantity governing
C)
Injection governing
D)
Hit and miss governing
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Quality governing' (Option A).
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).
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).
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).
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).
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).
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).
During a throttling process -
A)
internal energy remains constant
B)
enthalpy of fluid remains constant
C)
pressure remains constant
D)
temperature remains constant
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'enthalpy of fluid remains constant' (Option B).
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).
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).
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).
A control volume refers to -
A)
a fixed region in space
B)
a fixed quantity of matter
C)
an isolated system
D)
a closed system
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'a fixed region in space' (Option A).
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).
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).
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).
The function of regenerator in a gas turbine plant is -
A)
to heat the compressed air from the compressor
B)
to heat the gas before inlet to gas turbine
C)
to exchange the heat from hot gases from combustion chamber to exhaust gases of the turbine
D)
to heat the compressed air in between the stages
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'to heat the compressed air in between the stages' (Option D).
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).
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).
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).