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Past Questions
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).
Which of the following is an extensive property?
A)
Volume
B)
Temperature
C)
Pressure
D)
Density
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Volume' (Option A).
The gas having higher calorific value is -
A)
water gas
B)
coke-oven gas
C)
blast-furnace gas
D)
producer gas
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'blast-furnace gas' (Option C).
A good fuel has -
A)
low ignition point and high calorific value
B)
low ignition point and low calorific value
C)
high ignition point and high calorific value
D)
high ignition point and low calorific value
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'low ignition point and low calorific value' (Option B).
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).
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).
It is impossible to construct an engine which while operating in a cycle, produces no other effect except to extract the heat from a single-temperature reservoir and do equivalent amount of work -
A)
It refers to Clasius statement
B)
It refers to Kelvine–Planck’s statement
C)
It refers to Carnot’s theorem
D)
It refers to Clasius’s theorem
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'It refers to Clasius statement' (Option A).
In a two-stroke engine, one power stroke is obtained in -
A)
one revolution of the crank shaft
B)
two revolutions of the crank shaft
C)
four revolutions of the crank shaft
D)
none of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'two revolutions of the crank shaft' (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).
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).
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).
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).
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).
Which one of the following is part of air standard Atkinson cycle?
A)
Isothermal heat addition
B)
Constant-volume heat rejection
C)
Constant-volume heat addition
D)
Constant-pressure heat addition
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Constant-volume heat addition' (Option C).
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).