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Recent questions and answers in Fluid Mechanics and Thermal Sciences
0
answers
0
votes
transfer function for second order system
A second order real system has the following properties.The damping ratio is 0.5 and undamped natural frequency is 10rad/sec, the steady state value at zero is 1.02.the transfer function for the system is?
refri_12
asked
in
Fluid Mechanics
Feb 16
by
refri_12
140
points
0
answers
0
votes
mole fraction and mass fraction
a mixture of carbon dioxide and water vapour is at 100kPa, 200C temperature. As the mixture is cooled at a constant pressure, water vapour begins to condense when the temperature reaches 70C , determine mole fraction and mass fraction of carbon dioxide ... -820kJ/kmol 277.778K h2 280K -528kJ/kmol the molar specific enthalpy of nitrogen at 277.778K is -592.88kJ/kmol
refri_12
asked
in
Fluid Mechanics
Feb 16
by
refri_12
140
points
1
answer
1
vote
GATE2019 ME-1: 49
A steam power cycle with regeneration as shown below on the $T-s$ diagram employs a single open feedwater heater for efficiency improvement. The fluid mix with each other in an open feedwater heater. The turbine is isentropic and the input (bleed) to the feedwater ... from the turbine as a percentage of the total mass flow rate at the inlet to the turbine at state $1$ is _______
GG
answered
in
Applications
Apr 21, 2021
by
GG
540
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
1
answer
0
votes
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
0
answers
0
votes
GATE2020-ME-2: 6
A circular disk of radius $r$ is confined to roll without slipping at $P$ and $Q$ as shown in the figure. If the plates have velocities as shown, the magnitude of angular velocity of the disk is $\dfrac{V}{r} \\$ $\dfrac{V}{2r} \\$ $\dfrac{2V}{3r} \\$ $\dfrac{3V}{2r} $
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
velocity-diagrams
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 14
Which of the following conditions is used to determine the stable equilibrium of all partially submerged floating bodies? Centre of buoyancy must be above the centre of gravity Centre of buoyancy must be below the centre of gravity Metacentre must be at a higher level than the centre of gravity Metacentre must be at a lower level than the centre of gravity
go_editor
asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
stability-of-floating-bodies
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 16
A closed vessel contains pure water, in thermal equilibrium with its vapour at $25^\circ C$(Stage$\#1$ ... Valve $A$ Nothing will happen - the vessel will continue to remain in equilibrium All the vapor inside the vessel will immediately condense
go_editor
asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 17
For an air-standard Diesel cycle, heat addition is at constant volume and heat rejection is at constant pressure heat addition is at constant pressure and heat rejection is at constant pressure heat addition is at constant pressure and heat rejection is at constant volume heat addition is at constant volume and heat rejection is at constant volume
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
diesel-and-dual-cycles
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 48
Consider a flow through a nozzle, as shown in the figure below. The air flow is steady, incompressible and inviscid. The density of air is $1.23 \: kg/m^3$. The pressure difference, $(p_1-p_{\text{atm}})$ is _________ kPa (round off to $2$ decimal places)
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 49
Water (density $1000 \: kg/m^3$) flows through an inclined pipe of uniform diameter. The velocity, pressure and elevation at section $\textbf{A}$ are $V_A=3.2 \: m/s, \: p_A=186 \text{kPa}$ and $z_A=24.5 \: m$ ... acceleration due to gravity is $10 \: m/s^2$ then the head lost due to friction is ________ $m$ (round off to one decimal place)
go_editor
asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 50
The spectral distribution of radiation from a black body at $T_1=3000 \: K$ has a maximum at wavelength $\lambda_{\text{max}}$. The body cools down to a temperature $T_2$ ... the original wavelength $\lambda_{\text{max}}$, then the temperature $T_2$ is _________ $K$ (round off to nearest integer)
go_editor
asked
in
Heat Transfer
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
black-and-grey-surfaces
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 51
Water flows through a tube of $3$ cm internal diameter and length $20$ m. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are ... The inner surface temperature at the exit section of the tube is ___________ $^\circ C$ (round off to one decimal place
go_editor
asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 52
Air is contained in a frictionless piston-cylinder arrangement as shown in the figure. The atmosphere pressure is $100$ kPa and the initial pressure of air in the cylinder is $105$ kPa. The area of piston is $300 \: cm^2$. Heat is now added and ... N/mm. Considering the air inside the cylinder as the system, the work interaction is _________ J (round off to the nearest integer)
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 53
Moist air at $105$ kPa, $30^\circ C$ and $80\%$ relative humidity flows over a cooling coil in an insulated air-conditioning duct. Saturated air exits the duct at $100$ kPa and $15^\circ C$. The saturation pressures of water at $30^\circ C$ ... $28.94$ g/mol. The mass of water condensing out from the duct is ______ g/kg of dry air (round off to the nearest integer).
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 54
In a steam power plant, superheated steam at $10$ MPa and $500^\circ C$, is expanded isentropically in a turbine until it becomes a saturated vapour. It is then reheated at constant pressure to $500 ^\circ C$. The steam is next expanded isentropically in another turbine until ...
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 55
Keeping all other parameters identical, the Compression Ratio (CR) of an air standard diesel cycle is increased from $15$ to $21$. Take ratio of specific heats $=1.3$ and cut-off ratio of the cycle $r_c=2$. The difference between the new and the old efficiency values, in ... $\%$ (round off to one decimal place).
go_editor
asked
in
Applications
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
applications
diesel-and-dual-cycles
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
1
answer
1
vote
Self doubt
With increase in pressure the bulk modulus of elasticity__?
nadim96
answered
in
Fluid Mechanics
Jul 3, 2020
by
nadim96
210
points
0
answers
0
votes
GATE2020-ME-1: 11
Match the following ... $P-3,\:Q-3,\:R-1\:,S-3$ $P-4,\:Q-3,\:R-2\:,S-1$
go_editor
asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2020-ME-1: 14
Froude number is the ratio of buoyancy forces to viscous forces inertia forces to viscous forces buoyancy forces to inertia forces inertia forces to gravity forces
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
buoyancy
0
answers
0
votes
GATE2020-ME-1: 15
Match the following non-dimensional numbers with the corresponding definitions: ... $P-3, Q-1, R-2, S-4$ $P-4, Q-3, R-1, S-2$ $P-3, Q-1, R-4, S-2$
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2020-ME-1: 16
The velocity field of an incompressible flow in a Cartesian system is represented by $\overrightarrow{V}=2\left ( x^{2}-y^{2} \right )\widehat{i}+v\widehat{j}+3\widehat{k}$ Which one of the following expressions for $v$ is valid? $-4xz + 6xy$ $ – 4xy – 4xz$ $4xz – 6xy$ $4xy + 4xz$
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2020-ME-1: 24
The compressor of a gas turbine plant, operating on an ideal intercooled Brayton cycle, accomplishes an overall compression ratio of $6$ in a two-stage compression process. Intercooling is used to cool the air coming out from the first stage to the ... gas are constant, the intercooling pressure for minimum compressor work is __________ $kPa$ (rounded off to $2$ decimal places).
go_editor
asked
in
Applications
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2020-ME-1: 25
In a concentric tube counter-flow heat exchanger, hot oil enters at $102^{\circ}C$ and leaves at $65^{\circ}C$. Cold water enters at $25^{\circ}C$ and leaves at $42^{\circ}C$. The log mean temperature difference $(LMTD)$ is ________ $^{\circ}C$ (round off to one decimal place).
go_editor
asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2020-ME-1: 34
A small metal bead $(\text{radius}\: 0.5\: mm)$, initially at $100^{\circ}C$ , when placed in a stream of fluid at $20^{\circ}C$ , attains a temperature of $28^{\circ}C$ in $4.35$ ... heat transfer coefficient $(in\:W/m^{2}.K)$ between the metal bead and the fluid stream is $283.3$ $299.8$ $149.9$ $449.7$
go_editor
asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2020-ME-1: 49
Consider steady, viscous, fully developed flow of a fluid through a circular pipe of internal diameter $\text{D}$. We know that the velocity profile forms a paraboloid about the pipe centre line, given by: $V=-C\left(r^{2}-\dfrac{D^{2}}{4}\right) m/s$ ... the control surface $\text{A-B}$, as shown in the figure, is proportional to $D^{n}$. The value of $n$ is ________.
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2020-ME-1: 50
Air discharges steadily through a horizontal nozzle and impinges on a stationary vertical plate as shown in figure. The inlet and outlet areas of the nozzle are $0.1\:m^{2}\:\text{and}\:0.02\:m^{2}$ ... is $0.36\:kPa$, the gauge pressure at point $O$ on the plate is __________ $kPa$ (round off to two decimal places).
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
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: 54
For a Kaplan (axial flow) turbine, the outlet blade velocity diagram at a section is shown in the figure. The diameter at this section is $3\:m$.The hub and tip diameters of the blade are $2\:m$ and $4\:m$, respectively. The water volume flow ... rotational speed of the turbine is $300\:rpm$. The blade outlet angle $\beta$ is ________ degrees (round off to one decimal place).
go_editor
asked
in
Applications
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
kaplan-turbines
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
1
answer
0
votes
GATE2018-1-47
A plane slab of thickness $L$ and thermal conductivity $k$ is heated heated with a fluid on one side $(P)$, and the other side $(Q)$ is maintained at a constant temperature, $T_Q$ of $25^{\circ}C$ ... The steady state temperature, $T_P$ (in $^{\circ}$C) of the side which is exposed to the fluid is _____ (correct to two decimal places)
GG
answered
in
Heat Transfer
Apr 26, 2019
by
GG
540
points
gateme-2018-set1
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
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