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Engineering Thermodynamics
Quiz 4
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Q.1
One watt is equal to
1 Nm/s
1 N/m
1 Nm/hr
1 kNm/hr
Q.2
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as
Temperature
Absolute temperature, if volume is kept constant
Volume, if temperature is kept constant
None of these
Q.3
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
Atomization
Carbonization
Combustion
None of these
Q.4
The throttling process is __________ process.
Reversible
Irreversible
Reversible or irreversible
None of these
Q.5
The atomic mass of nitrogen is __________ oxygen.
Equal to
Less than
More than
None of these
Q.6
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
First kind
Second kind
Third kind
None of these
Q.7
The efficiency of Stirling cycle is __________ Carnot cycle.
Greater than
Less than
Equal to
None of these
Q.8
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
+ve
-ve
Zero
Anywhere between zero and infinity
Q.9
The specific heat of air increases with increase in
Temperature
Pressure
Both pressure and temperature
Variation of its constituents
Q.10
The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
Work done
Entropy
Power
Enthalpy
Q.11
The fuel mostly used in steam boilers is
Brown coal
Peat
Coking bituminous coal
Non-coking bituminous coal
Q.12
Water contained in a beaker can be made to boil by passing steam through it
At atmospheric pressure
At a pressure greater than atmospheric pressure
Any pressure
Not possible
Q.13
A tri-atomic molecule consists of __________ atoms.
Three
One
Two
Four
Q.14
The efficiency of Ericsson cycle is __________ Carnot cycle.
Greater than
Less than
Equal to
None of these
Q.15
The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.
Greater than
Less than
Equal to
None of these
Q.16
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
Greater than
Less than
Equal to
None of these
Q.17
The gas constant (R) is equal to the
Sum of two specific heats
Difference of two specific heats
Product of two specific heats
Ratio of two specific heats
Q.18
For which of the following substances, the internal energy and enthalpy are the functions of temperature only
Any gas
Saturated steam
Water
Perfect gas
Q.19
The mass of flue gas per kg of fuel is the ratio of the
Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel
Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
Q.20
An open cycle gas turbine works on
Otto cycle
Carnot cycle
Joule's cycle
Stirling cycle
Q.21
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
Zeroth low of thermodynamic
First law of thermodynamics
Second law to thermodynamics
Basic law of thermodynamics
Q.22
The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called
Specific heat at constant volume
Specific heat at constant pressure
kilo-Joule
None of these
Q.23
In an isothermal process, the internal energy of gas molecules
Increases
Decreases
Remain constant
May increase/decrease depending on the properties of gas
Q.24
The absolute zero pressure will be
When molecular momentum of the system becomes zero
At sea level
At the temperature of - 273 K
At the center of the earth
Q.25
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is
23.97 bar
25 bar
26.03 bar
34.81 bar
Q.26
Total heat of a substance is also known as
Internal energy
Entropy
Thermal capacity
Enthalpy
Q.27
According to which law, all perfect gases change in volume by 1/273
th
of their original volume at 0°C for every 1°C change in temperature when pressure remains constant
Joule's law
Boyle's law
Gay Lussac’s law
Charles' law
Q.28
Otto cycle is also known as
Constant pressure cycle
Constant volume cycle
Constant temperature cycle
Constant temperature and pressure cycle
Q.29
The entropy of water at 0°C is assumed to be
0
-1
1
2
Q.30
According to kinetic theory of gases, the absolute zero temperature is attained when
Volume of the gas is zero
Pressure of the gas is zero
Kinetic energy of the molecules is zero
Specific heat of gas is zero
0 h : 0 m : 1 s
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