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Mechanical Engineering
Engineering Thermodynamics
Quiz 3
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Q.1
Entropy change depends on
Heat transfer
Mass transfer
Change of temperature
Thermodynamic state
Q.2
Coke is produced
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
From the finely ground coal by moulding under pressure with or without a binding material
When coal is first dried and then crushed to a fine powder by pulverizing machine
By heating wood with a limited supply of air to a temperature not less than 280°C
Q.3
When a gas is heated at constant pressure
Its temperature will increase
Its volume will increase
Both temperature and volume will increase
Neither temperature not volume will increase
Q.4
One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
8/3
11/3
11/7
7/3
Q.5
For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
Zero
Minimum
Maximum
Infinity
Q.6
First law of thermodynamics furnishes the relationship between
Heat and work
Heat, work and properties of the system
Various properties of the system
Various thermodynamic processes
Q.7
The measurement of a thermodynamic property known as temperature is based on
First law of thermodynamics
Second law of thermodynamics
Zeroth law of thermodynamics
None of these
Q.8
Measurement of temperature is based on
Thermodynamic properties
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Q.9
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kelvin Planck's law
Q.10
All perfect gases change in volume by 1/273
th
of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
Boyle's law
Charles' law
Gay-Lussac law
Joule's law
Q.11
The basis for measuring thermodynamic property of temperature is given by
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
Q.12
The absolute zero temperature is taken as
237°C
-273°C
-237°C
273°C
Q.13
Which of the following statement is wrong?
The closed cycle gas turbine plants are external combustion plants.
In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.
Q.14
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as
Cracking
Carbonization
Fractional distillation
Full distillation
Q.15
The process is adiabatic, if the value of n in the equation pvn = C, is
Zero
One
γ
∝
Q.16
The heat and mechanical energies are mutually convertible. This statement was established by
Boyle
Charles
Joule
None of these
Q.17
Mond gas is obtained by
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Carbonisation of bituminous coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C
Q.18
Producer gas is obtained by
Carbonization of bituminous coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C
Q.19
In open cycle gas turbine plants
Direct combustion systems is used
A condenser is used
The indirect heat exchanger and cooler is avoided
All of the above
Q.20
The atomic mass of sulphur is
12
14
16
32
Q.21
Kelvin-Planck’s law deals with
Conservation of work
Conservation of heat
Conversion of work into heat
Conversion of heat into work
Q.22
The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
rγ - 1
1 - rγ - 1
1 - (1/r) γ/γ - 1
1 - (1/r) γ - 1/ γ
Q.23
A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is
Theoretically possible
Not possible
May be possible with lot of sophistications
Cost will be very high
Q.24
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
A temperature of - 273.16°C
A temperature of 0°C
A temperature of 273 °K
A negative pressure and 0°C temperature
Q.25
Work done in a free expansion process is
Zero
Maximum
Minimum
Positive
Q.26
Characteristic gas constant of a gas is equal to
Cp /Cv
Cv /Cp
Cp - Cv
Cp + Cv
Q.27
The variables which control the physical properties of a perfect gas are
Pressure exerted by the gas
Volume occupied by the gas
Temperature of the gas
All of these
Q.28
Work-done in a free expansion process is
Zero
Minimum
Maximum
Positive
Q.29
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
0.086
1.086
1.086
4.086
Q.30
Diesel cycle consists of __________ processes.
Two constant volume and two isentropic
Two constant pressure and two isentropic
Two constant volume and two isothermal
One constant pressure, one constant volume and two isentropic
0 h : 0 m : 1 s
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