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Recent questions tagged fluid-mechanics-and-thermal-science
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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
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Thermodynamics
Feb 9, 2019
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Arjun
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gateme-2019-set1
fluid-mechanics-and-thermal-science
thermodynamics
0
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0
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GATE2019 ME-1: 9
For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section, the Nusselt number at constant wall heat flux $(Nu_q)$ and that at constant wall temperature $(Nu_T)$ are related as $Nu_q > Nu_T$ $Nu_q < Nu_T$ $Nu_q = Nu_T$ $Nu_q = (Nu_T)^2$
Arjun
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Fluid Mechanics
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-1: 10
As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are Kaplan, Francis, Pelton Pelton, Francis, Kaplan Francis, Kaplan, Pelton Pelton, Kaplan, Francis
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Applications
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2019 ME-1: 11
A slender rod of length $L$, diameter $d$ $(L > >d)$ and thermal conductivity $k_1$ is joined with another rod of identical dimensions, but of thermal conductivity $k_2$, to form a composite cylindrical rod of length $2L$. The heat transfer in radial direction and ... composite rod is $k_1+k_2 \\$ $\sqrt{k_1k_2} \\$ $\dfrac{k_1k_2}{k_1+k_2} \\$ $\dfrac{2k_1k_2}{k_1+k_2}$
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Heat Transfer
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-1: 12
Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle? Coefficient of ... performance is the same as that of the original cycle Refrigerating effect is lower than that of the original cycle
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Applications
Feb 9, 2019
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27.4k
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gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
refrigeration-and-air-conditioning
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0
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GATE2019 ME-1: 21
A solid cube of side $1$ m is kept at a room temperature of $32^{\circ} C$. The coefficient of linear thermal expansion of the cube material is $1 \times 10^{-5} / ^{\circ}C$ and the bulk modulus is $200$ GPa. If the cube is constrained all around and heated uniformly to $42^{\circ}C$, then the magnitude of volumetric (mean) stress (in MPa) included due to heating is _______
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Heat Transfer
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-1: 23
Water flows through a pipe with a velocity given by $\overrightarrow{V}= \bigg( \dfrac{4}{t}+x+y \bigg) \hat{j} \: m/s$, where $\hat{j}$ is the unit vector in the $y$ direction, $t(>0)$ is in seconds, and $x$ and $y$ are in meters. The magnitude of total acceleration at the point $(x,y)=(1,1)$ at $t=2\: s$ is ______$m/s^2$
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Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
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gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
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 ______
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Thermodynamics
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2019 ME-1: 31
The rotor of a turbojet engine of an aircraft has a mass $180 \: kg$ and polar moment of inertia $10 \: kg \cdot m^2$ about the rotor axis. The rotor rotates at a constant speed of $1100 \: rad/s$ in the clockwise direction when viewed from the front of the aircraft. The ... the nose goes down $162.9 \: N \cdot m$ and the nose goes up $162.9 \: N \cdot m$ and the nose goes down
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Applications
Feb 9, 2019
by
Arjun
27.4k
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gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2019 ME-1: 32
The wall of a constant diameter pipe of length $1 \: m$ is heated uniformly with flux $q''$ by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid is incompressible and the flow is assumed to be laminar and ... the location P, Q and R, the flow is thermally developed at P, Q and R P and Q only Q and R only R only
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Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
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
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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: 45
Two immiscible, incompressible, viscous fluids having same densities but different viscosities are contained between two infinite horizontal parallel plates, $2 \: m$ apart as shown below. The bottom plate is fixed and the upper plate moves to the right with a constant ... fluid, $\mu_1$, then the velocity at the interface (round off to two decimal places) is _______ $m/s$.
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Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-1: 46
A cube of side $100 \: mm$ is placed at the bottom of an empty container on one of its faces. The density of the material of the cube is $800 \: kg/m^3$. Liquid of density $1000 \: kg/m^3$ is now poured into the container. The minimum height to which the liquid needs to be poured into the container for the cube to just lift up is __________$mm$.
Arjun
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in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2019 ME-1: 47
Three slabs are joined together as shown in the figure. There is no thermal contact resistance at the interfaces. The center slab experiences a non-uniform internal heat generation with an average value equal to $10000 \: Wm^{-3}$, while the left and right slabs have no ... $T_1$ is measured to be $100^{\circ} C$, the right extreme face temperature $T_2$ is ______$^{\circ} C$.
Arjun
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in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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. $(R=8.314 \: J/mol \cdot K)$
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Thermodynamics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
thermodynamics
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 _______
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Applications
Feb 9, 2019
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Arjun
27.4k
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gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2019 ME-1: 50
A gas turbine with air as the working fluid has an isentropic efficiency of $0.70$ when operating at a pressure ratio of $3$. Now, the pressure ratio of the turbine is increased to $5$, while maintaining the same inlet conditions. Assume air as a ... the cases, the isentropic efficiency of the turbine at the pressure ratio of $5$ is ___________ (round off to two decimal places)
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Applications
Feb 9, 2019
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Arjun
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gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
1
vote
GATE ME 2012 | Question: 53
Air enters an adiabatic nozzle at $300$ kPa, $500$ K with a velocity of $10$ m/s. It leaves the nozzle at $100$ kPa with a velocity of $180$ m/s. The inlet area is $80 \: cm^2$. The specific heat of air $C_p$ is $1008$ J/kg.K. The exit area of the nozzle in $cm^4$ is $90.1$ $56.3$ $4.4$ $12.9$
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 52
Air enters an adiabatic nozzle at $300$ kPa, $500$ K with a velocity of $10$ m/s. It leaves the nozzle at $100$ kPa with a velocity of $180$ m/s. The inlet area is $80 cm^2$. The specific heat of air $C_p$ is $1008$ J/kg.K. The exit temperature of the air is $516$ K $532$ K $484$ K $468$ K
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
1
vote
GATE ME 2012 | Question: 51
A refrigerator operates between $120$ kPa and $800$ kPa in an ideal vapor compression cycle with $R-134a$ as the refrigerant. The refrigerant renters the compressor as saturated vapor and leaves the condenser as saturated liquid. The mass flow rate of the refrigerant is $0.2$ ... $5.94$ $1.83$ $7.9$ $39.5$
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Applications
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
applications
fluid-mechanics-and-thermal-science
refrigeration
0
answers
0
votes
GATE ME 2012 | Question: 50
A refrigerator operates between $120$ kPa and $800$ kPa in an ideal vapor compression cycle with $R-134a$ ... at which heat is extracted, in Kj/s from the refrigerated space is $28.3$ $42.9$ $34.4$ $14.6$
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Applications
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
applications
refrigeration
0
answers
0
votes
GATE ME 2012 | Question: 42
A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by $\Delta T$. If the thermal coefficient of the material is $\alpha$, Young's modulus is $E$ and the Poisson's ratio is $\upsilon$, the thermal stress developed in the cube due to ... $-\dfrac{\alpha (\Delta T) E}{3 (1-2 \upsilon)}$
Andrijana3306
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 41
Water $(C_p=4.18 \: kJ/kg.K)$ at $80^{\circ} C$ enters a counterflow heat exchanger with a mass flow rate of $0.5 \: kg/s$. Air ($C_p=1 \: kJ/kg.K$) enters at $30^{\circ} C$ with a mass flow rate of $2.09 \: kg/s$. If the effectiveness of heat exchanger is $0.8$, the LMTD (in $^{\circ} C$) is $40$ $20$ $10$ $5$
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
lmtd-and-ntu-methods
0
answers
0
votes
GATE ME 2012 | Question: 40
A large tank with a nozzle attached contains three immiscible, inviscid fluid as shown. Assuming that the changes in $h_1, h_2$ and $h_3$ ...
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 29
Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $D_1$ and $D_2$ are the diameters of the inner and outer tubes respectively, then the view factor $F_{22}$ is given by $\bigg( \dfrac{D_1}{D_2} \bigg) -1 \\$ $\text{zero} \\$ $\bigg( \dfrac{D_1}{D_2} \bigg) \\$ $1- \bigg( \dfrac{D_1}{D_2} \bigg)$
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE ME 2012 | Question: 31
A room contains $35$ kg of dry air and $0.5$ kg of water vapor. The total pressure and temperature of air in the room are $100$ kPa and $25^{\circ}$C respectively. Given that the saturation pressure for water at $25^{\circ}$ C is $3.17$ kPa, the relative humidity of the air in the room is $67 \%$ $55 \%$ $83 \%$ $71 \%$
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Applications
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
applications
0
answers
0
votes
GATE ME 2012 | Question: 30
An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is $1$ mm at a location where the Reynolds number is $1000$. If the velocity of the fluid alone is increased by a factor of $4$, then the boundary layer thickness at the same location, in mm will be $4$ $2$ $0.5$ $0.25$
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
boundary-layer
0
answers
0
votes
GATE ME 2012 | Question: 19
An ideal gas of mass $m$ and temperature $T_1$ undergoes a reversible isothermal process from an initial pressure $P_1$ to final pressure $P_2$. The hear loss during the process is $Q$. The entropy change $\Delta S$ ... $mR \: \ln \bigg( \dfrac{P_2}{P_1} \bigg) - \dfrac{Q}{T_1} \\$ $\text{zero}$
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 18
Which one of the following configurations has the highest fin effectiveness? Thin, closely spaced fins Thin, widely spaced fins Thick, widely spaced fins Thick, closely spaced fins
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
fin
0
answers
0
votes
GATE ME 2012 | Question: 17
The velocity triangles at the inlet and exit of the rotor of a turbomachine are shown. $V$ denotes the absolute velocity of the fluid, $W$ denotes the relative velocity of the fluid and $U$ denotes the blade velocity. Subscripts $1$ and $2$ refer to inlet and outlet respectively. If $V_2 =W_1$ and $V_1=W_2$, then the degree of reaction is $0$ $1$ $0.5$ $0.25$
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 10
A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is increased by $1 \%$ and the thickness is reduced by $1 \%$ with the internal pressure remaining the same, the percentage change in the circumferential (hoop) stress is $0$ $1$ $1.08$ $2.02$
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 7
Steam enters an adiabatic turbine operating at steady state with an enthalpy of $3251.0 \: kJ/kg$ and leaves as a saturated mixture at $15 \:kPa$ with quality (dryness fraction) $0.9$. The enthalpies of the saturated liquid and vapor at $15 \: kPa$ ... and potential energy changes are negligible. The power output of the turbine in MW is $6.5$ $8.9$ $9.1$ $27.0$
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Applications
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
applications
0
answers
0
votes
GATE ME 2012 | Question: 6
For an opaque surface, the absorptivity ($\alpha$), transmissivity ($\tau$) and reflectivity ($\rho$) are related by the equation $\alpha + \rho = \tau$ $\rho + \alpha + \tau =0$ $\alpha + \rho =1$ $\alpha + \rho =0$
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE ME 2012 | Question: 5
Oil flows through a $200$ mm diameter horizontal cast iron pipe (friction factor, $f=0.0225$) of length $500 m$. The volumetric flow rate is $0.2 \: m^3/s$. The head loss (in m) due to friction is (assume $g=9.81 m/s^2$) $116.18$ $0.116$ $18.22$ $232.36$
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
head-losses-in-pipes
0
answers
0
votes
GATE ME 2012 | Question: 4
During $\textit{normalizing} $ process of steel, the specimen is heated between the upper and lower critical temperature and cooled in still air above the upper critical temperature and cooled in furnace above the upper critical temperature and cooled in still air between the upper and lower critical temperature and cooled in furnace
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 1
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate increases continuously decreases continuously decreases, becomes stable and then increases increases, becomes stable and then decreases
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
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)
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Heat Transfer
Feb 17, 2018
by
Arjun
27.4k
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gateme-2018-set1
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2018-1-46
An engine working on air standard Otto cycle is supplied with air at $0.1 MPa$ and $35^{\circ} \: C$. The compression ratio is $8$. The heat supplied is $500 \: kJ/kg \: K$. The maximum temperature (in $K$) of the cycle is _______ (correct to one decimal place)
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Applications
Feb 17, 2018
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Arjun
27.4k
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fluid-mechanics-and-thermal-science
0
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0
votes
GATE2018-1-45
Steam flows through a nozzle at a mess flow rate of $m=0.1 \: kg/s$ with a heat loss of $5 \: kW$. The enthalpies at inlet and exit are $2500 \: kJ/kg$ and $2350 \: kJ/kg$, respectively. Assuming negligible velocity in inlet ($C_1 \approx 0$), the velocity ($C_2$) of steam (in $m/s$) at the nozzle exit is _____ (correct to two decimal places).
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Applications
Feb 17, 2018
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Arjun
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gateme-2018-set1
numerical-answers
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fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2018-1-43
A solid block of $2.0 \: kg$ mass slides steadily at a velocity $V$ along a vertical wall as shown in the figure below. A thin oil film of thickness $h=0.15 \: mm$ provides lubrication between the block and the wall. The surface area of the face of the block ... $V$ (in $m/s$) of the block is ______ (correct to one decimal place)
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Fluid Mechanics
Feb 17, 2018
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Arjun
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