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Recent questions and answers in Thermodynamics
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GATE Mechanical 2014 Set 2 | Question: 46
In an ideal Brayton cycle, atmospheric air (ratio of specific heats, $c_p$/$c_v$ = $1.4$, specific heat at constant pressure = $1.005$ $kJ/kg.K$) at $1$ $bar$ and $300$ $K$ is compressed to $8$ $bar$. The maximum temperature in the cycle ... the heat is supplied at the rate of $80$ $MW$, the mass flow rate (in $kg/s$) of air required in the cycle is _______
GG
answered
in
Thermodynamics
Apr 20, 2021
by
GG
540
points
gateme-2014-set2
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
1
answer
0
votes
GATE2015-3-10
The thermodynamic cycle shown in figure ($T$-$s$ diagram) indicates reversed Carnot cycle reversed Brayton cycle vapor compression cycle vapor absorption cycle
GG
answered
in
Thermodynamics
Apr 20, 2021
by
GG
540
points
gateme-2015-set3
fluid-mechanics-and-thermal-science
thermodynamics
1
answer
0
votes
GATE2016-1-16
Which of the following statements are TRUE with respect to heat and work? They are boundary phenomena They are exact differentials They are path functions both $(i)$ and $(ii)$ both $(i)$ and $(iii)$ both $(ii)$ and $(iii)$ only $(iii)$
GG
answered
in
Thermodynamics
Apr 20, 2021
by
GG
540
points
gateme-2016-set1
calculation-of-work-and-heat-in-various-processes
thermodynamics
fluid-mechanics-and-thermal-science
1
answer
0
votes
GATE2016-2-17
The internal energy of an ideal gas is a function of temperature and pressure volume and pressure entropy and pressure temperature only
GG
answered
in
Thermodynamics
Apr 20, 2021
by
GG
540
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
thermodynamics
1
answer
0
votes
GATE2020-ME-1: 18
For an ideal gas, a constant pressure line and a constant volume line intersect at a point, in the Temperature $(T)$ versus specific entropy $\text{(s)}$ diagram. $C_{P}$ is the specific heat at constant pressure and $C_{V}$ is the specific heat at constant volume.The ratio of the slopes of the ... $\dfrac{C_{P}}{C_{V}} \\$ $\dfrac{C_{P}-C_{V}}{C_{V}} \\$ $\dfrac{C_{V}}{C_{P}}$
GG
answered
in
Thermodynamics
Apr 19, 2021
by
GG
540
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
thermodynamics
1
answer
0
votes
GATE2020-ME-1: 17
For an ideal gas, the value of the Joule-Thomson coefficient is positive negative zero indeterminate
GG
answered
in
Thermodynamics
Apr 19, 2021
by
GG
540
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
Thermometer questions in thermodynamics
In a new temperature scale degree(symbol)P ,the boiling point of water is 100 degree(symbol)P and the freezing point of water is 300 degree(symbol)P .Find the reading corresponding to 0 degree(symbol)P in centrigrade scale . Solve the question and explain each step properly with detailed solutions
Kumar Pranjal
asked
in
Thermodynamics
Apr 11, 2021
by
Kumar Pranjal
120
points
0
answers
0
votes
Entroy:-why entropy generation is a an path function
Nick2277
asked
in
Thermodynamics
Feb 25, 2021
by
Nick2277
120
points
1
answer
0
votes
GATE2017 ME-2: 15
If a mass of moist air contained in a closed metallic vessel is heated, then its Relative humidity decreases. Relative humidity increases. Specific humidity increases. Specific humidity decreases.
GG
answered
in
Thermodynamics
Nov 23, 2020
by
GG
540
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
thermodynamics
1
answer
0
votes
GATE2020-ME-1: 52
One kg of air, initially at a temperature of $127^{\circ}C$ , expands reversibly at a constant pressure until the volume is doubled. If the gas constant of air is $287\: J/kg.K$, the magnitude of work transfer is ________ $kJ$ (round off to $2$ decimal places).
nadim96
answered
in
Thermodynamics
Jul 3, 2020
by
nadim96
210
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2020-ME-1: 51
Air (ideal gas) enters a perfectly insulated compressor at a temperature of $310\: K$. The pressure ratio of the compressor is $6$. Specific heat at constant pressure for air is $1005\: J/kg . K$ and ratio of specific heats at constant pressure ... difference in enthalpies of air between the exit and the inlet of the compressor is _________ $kJ/kg$ (round off to nearest integer).
go_editor
asked
in
Thermodynamics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2020-ME-1: 53
For an ideal Rankine cycle operating between pressures of $30$ bar and $0.04$ bar,the work output from the turbine is $903\: kJ/kg$ and the work input to the feed pump is $3\: kJ/kg$. The specific steam consumption is _________ $kg/kW.h$ round off to $2$ decimal places).
go_editor
asked
in
Thermodynamics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2020-ME-1: 55
The indicated power developed by an engine with compression ratio of $8$, is calculated using an air-standard Otto cycle (constant properties). The rate of heat addition is $10\: kW$ ... of the engine is $80$ percent. The brake power output of the engine is _________$kW$ (round off to one decimal place).
go_editor
asked
in
Thermodynamics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
i.c-engines
0
answers
0
votes
GATE2019 ME-2: 12
For a simple compressible system, $v, s, p$ and $T$ are specific volume, specific entropy, pressure and temperature, respectively. As per Maxwell's relations, $\bigg( \dfrac{\partial v}{\partial s} \bigg) _p$ ... $ - \bigg( \dfrac{\partial T}{\partial v} \bigg) _p \\$ $\bigg( \dfrac{\partial T}{\partial p} \bigg) _s$
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
thermodynamic-relations
thermodynamics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-2: 13
Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet? Increasing the boiler pressure Decreasing the boiler pressure Increasing the turbine inlet temperature decreasing the condenser pressure
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
thermodynamics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-1: 8
During a non-flow thermodynamic process $(1-2)$ executed by a perfect gas, the heat interaction is equal to the work interaction $(Q_{1-2} = W_{1-2})$ when the process is Isentropic Polytropic Isothermal Adiabatic
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2019 ME-1: 24
Air of mass $1$ kg, initially at $300$ K and $10$ bar, is allowed to expand isothermally till it reaches a pressure of $1$ bar. Assuming air as an ideal gas with gas constant of $0.287 \: kJ/kg.K$, the change in entropy of air (in $kJ/kg.K$, round off to two decimal places) is ______
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2019 ME-1: 33
A gas is heated in a duct as it flows over a resistance heater. Consider a $101 \: kW$ electric heating system. The gas enters the heating section of the duct at $100 \: kPa$ and $27^{\circ} C$ with a volume flow rate of $15 m^3/s$. If heat is lost from the gas in the duct to the ... $32^{\circ} C$ $37^{\circ} C$ $53^{\circ} C$ $76^{\circ} C$
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2019 ME-1: 48
If one mole of $H_2$ has occupies a rigid container with a capacity of $1000$ litres and the temperature is raised from $27^{\circ} C$ to $37^{\circ} C$, the change in pressure of the contained gas (round off to two decimal places), assuming ideal gas behaviour, is _______ Pa. $(R=8.314 \: J/mol \cdot K)$
Arjun
asked
in
Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2018-2-44
Ambient air is at a pressure of $100 \: kPa$, dry bulb temperature at $30^{\circ} C$ and $60 \%$ relative humidity. The saturation pressure of water at $30^{\circ} C$ id $4.24 \: kPa$. The specific humidity of air (in $g/kg$ of dry air) is _______ (correct to two decimal places).
Arjun
asked
in
Thermodynamics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
numerical-answers
0
answers
0
votes
GATE2018-2-43
A standard vapor compression refrigeration cycle operating with a condensing temperature of $35^{\circ}C$ and an evaporating temperature of $-10^{\circ}C$ develops $15 \: kW$ of cooling. The $p-h$ diagram shows the enthalpies at various states. If the isentropic ... of the compressor is $0.75$, the magnitude of compressor power (in $kW$) is _________ (correct to two decimal places)
Arjun
asked
in
Thermodynamics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
numerical-answers
0
answers
0
votes
GATE2018-2-10
For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy $(\Delta s$) from state $1$ to $2$? $\Delta s = C_p \ln \bigg( \dfrac{T_2}{T_1} \bigg) - R \ln \bigg( \dfrac{P_2}{P_1} \bigg) \\$ ... $\Delta s = C_V \ln \bigg( \dfrac{T_2}{T_1} \bigg) + R \ln \bigg( \dfrac{V_1}{V_2} \bigg)$
Arjun
asked
in
Thermodynamics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
0
answers
0
votes
GATE2018-1-44
A tank of volume $0.05 \: m^3$ contains a mixture of saturated water and saturated steam at $200 ^{\circ}C$. The mass of the liquid present is $8 \: kg$. The entropy (in $kJ/kg \: K$) of the mixture is _______ (correct to two decimal places). Property data for saturated steam and water are: ... $s_{fg}=4.1014 \: kJ/kg \: K, \: s_f=2.3309 \: kJ/kg \: K$
Arjun
asked
in
Thermodynamics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
thermodynamics
0
answers
0
votes
GATE2017 ME-2: 45
The volume and temperature of air (assumed to be an ideal gas) in a closed vessel is $2.87 m^{3}$ and $300 \: K$, respectively. The gauge pressure indicated by a manometer fitted to the wall of the vessel is $0.5$ bar. If the gas constant of air is $R=287 \: J/kg.K$ and the atmospheric pressure is $1$ bar, the mass of air (in $kg$) in the vessel is $1.67$ $3.33$ $5.00$ $6.66$
Arjun
asked
in
Thermodynamics
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2017 ME-2: 44
One kg of an ideal gas (gas constant $R= 287\: J/kg.K$) undergoes an irreversible process from state-$1$ ($1$ bar, $300 \: K$) to state-$2$ ($2$ bar, $300\: K$). The change in specific entropy $(s_{2} - s_{1})$ of the gas (in $J/kg.K$) in the process is _________.
Arjun
asked
in
Thermodynamics
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2017 ME-2: 14
A mass $m$ of a perfect gas at pressure $p_{1}$ and volume $V_{1}$ undergoes an isothermal process. The final pressure is $p_{2}$ and volume is $V_{2}$. The work done on the system is considered positive. If $R$ is the gas constant and $T$ is the temperature, then the work done in the ... $RT \ln \dfrac{V_{2}}{V_{1}} \\$ $-mRT \ln \dfrac{P_{2}}{P_{1}}$
Arjun
asked
in
Thermodynamics
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2015-3-55
A mixture of ideal gases has the following composition by mass: $\begin{array}{|c|c|c|} \hline N_2 & O_2 & CO_2 \\ \hline 60\% & 30\% & 10 \% \\ \hline \end{array}$ If the universal gas constant is $8314 \: J/kmol-K$, the characteristic gas constant of the mixture (in $J/kg-K$) is ________
Arjun
asked
in
Thermodynamics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2015-set3
numerical-answers
thermodynamics
behaviour-of-ideal-and-real-gases
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2015-2-44
Work is done on an adiabatic system due to which its velocity changes from $10$ $m/s$ to $20$ $m/s$, elevation increases by $20$ $m$ and temperature increases by $1$ $K$. The mass of the system is $10$ $kg$, $C_v$ = $100$ $J/(kg.K)$ and ... $kJ$) on the system is _______
Arjun
asked
in
Thermodynamics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2015-set2
numerical-answers
thermodynamics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE Mechanical 2014 Set 2 | Question: 15
A pure substance at $8$ $MPa$ and $400^0C$ is having a specific internal energy of $2864$ $kJ/kg$ and a specific volume of $0.03432$ $m^3$/$kg$. Its specific enthalpy (in $kJ/kg$) is _______
Arjun
asked
in
Thermodynamics
Feb 19, 2017
by
Arjun
27.4k
points
gateme-2014-set2
numerical-answers
properties-of-pure-substances
thermodynamics
fluid-mechanics-and-thermal-science
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