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Mechanical Engineering
Thermal Engineering
Quiz 1
Solution
Q.1.
Which of the following is an extensive property?
Volume
Pressure
Viscosity
All of the above
Q.2.
Define refrigeration
It is the process of continuous cooling or extraction of heat to below that of the atmosphere from a substance with a help of the external work.
It is based on the second law of thermodynamics that the heat can made to flow from cold body to a hot body with the help of external source.
used to remove heat from the refrigerated space and reject it to atmosphere.
All of above
Q.3.
The flow through a nozzle is regarded as
constant volume flow
constant pressure flow
isothermal flow
isentropic flow
Q.4.
The motion of the cam is transferred to the valves through
Pistons
Rocker Arm
Cam shaft Pulley
Valve stems
Q.5.
How is absolute pressure measured?
Gauge pressure + Atmospheric pressure
Gauge pressure – Atmospheric pressure
Gauge pressure / Atmospheric pressure
None of the above
Q.6.
Which of the following energy conversion devices convert heat into work?
Electrical generators
I. C engines
Condensers
All of the above
Q.7.
Steam turbines may be classified according to
Direction of steam flow
Number of stages
Mode of steam action
All of these
Q.8.
Which of the following cycles uses ‘air’ as the refrigerant
Ericson
Bell Coleman
Stirling
Carnot
Q.9.
Recuperator as a waste heat recovery system is used mainly in a
boiler
reheating furnace
compressor
gas turbine
Q.10.
Odometer is an instrument used for measurement of
power
Fuel consumption
Engine speed
distance
Q.11.
What is full form of SI
Simple Ignition
Standard idling
Spark ignition
Solo identification
Q.12.
What is the pH value of water permissible for boiler?
0
5.5
6
8.5
Q.13.
What is a typical efficiency of a cogeneration system?
58%
85%
68%
95%
Q.14.
Which of the following statements is not correct
A topping cycle plant generates electricity or mechanical power first
A bottoming cycle plant generates heat first
Both a and b
A bottoming cycle plant generates electricity or mechanical power first
Q.15.
Objects with MORE MASS have______________
lower potential energy
lower number of atoms
higher thermal energy
higher temperature
Q.16.
A waste heat recovery steam generator is used with
steam turbines
back pressure turbines
gas turbines
condensing turbines
Q.17.
What is the function of air preheater?
To increase air temperature by flue gases
To increase water temperature by air
To increase steam temperature by air
To increase air temperature by steam
Q.18.
The heat recovery device in which high conductivity bricks are used for storing heat is
heat pipe
heat pump
thermo compressor
regenerator
Q.19.
Bottoming cycle cogeneration is characterized by
Heat first power later
Only Heat
Power First and Heat Later
Only Power
Q.20.
The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
Agree
Disagree
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