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Recent questions tagged fluid-mechanics-and-thermal-science
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GATE2017 ME-1: 6
For steady flow of a viscous incompressible fluid through a circular pipe of constant diameter, the average velocity in the fully developed region is constant. Which one of the following statements about the average velocity in the developing region is TRUE? ... the flow is fully developed. It is constant but is always lower than the average velocity in the fully developed region.
Arjun
asked
in
Fluid Mechanics
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
1
answer
0
votes
GATE2016-3-52
Two optically flat plates of glass are kept at a small angle $\theta$ as shown in the figure. Monochromatic light is incident vertically. If the wavelength of light used to get a fringe spacing of $1$ $mm$ is $450$ $nm$, the wavelength of light (in $nm$) to get a fringe spacing of $1.5$ $mm$ is _________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2016-3-47
In the vapour compression cycle shown in the figure, the evaporating and condensing temperatures are $260 \: K$ and $310 \: K$, respectively. The compressor takes in liquid-vapour mixture (state $1$) and isentropically compresses it to a dry saturated vapour condition (state ... $1$ and $0$ (in $kJ/kg$) is ____________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2016-3-46
In a $3$-stage air compressor, the inlet pressure is $p_1$, discharge pressure is $p_4$.and the intermediate pressures are $p_2$ and $p_3 ( p_2 < p_3)$. The total pressure ratio of the compressor is $10$ and the pressure ratios of the stages are equal. If $p_1 = 100$ $kPa$, the value of the pressure $p_3$ (in $kPa$) is __________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
applications
air-and-gas-compressors
0
answers
0
votes
GATE2016-3-45
In a mixture of dry air and water vapor at a total pressure of $750$ $mm$ of $Hg$, the partial pressure of water vapor is $20$ $mm$ of $Hg$. The humidity ratio of the air in grams of water vapor per $kg$ of dry air ($g_w/kg_{da}$) is __________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2016-3-44
Steam at an initial enthalpy of $100$ $kJ/kg$ and inlet velocity of $100$ $m/s$, enters an insulated horizontal nozzle. It leaves the nozzle at $200$ $m/s$. The exit enthalpy (in $kJ/kg$) is __________
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-3-43
A cylindrical steel rod, $0.01 \: m$ in diameter and $0.2 \: m$ in length is first heated to $750^ \circ C$ and then immersed in a water bath at $100^ \circ C$. The heat transfer coefficient is $250 \: W/m^2-K$. The density, specific heat and thermal ... $k=43 \: W/m-K$, respectively. The time required for the rod to reach $300^ \circ C$ is ________ seconds.
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-3-42
Two large parallel plates having a gap of $10 \: mm$ in between them are maintained at temperatures $T_1 = 1000 \: K$ and $T_2 = 400 \: K$. Given emissivity values, $\epsilon _1 = 0.5$, $\epsilon _2=0.25$ and Stefan-Boltzmann constant $\sigma =5.67 \times 10^{−8} \: W/m^2-K^4$, the heat transfer between the plates (in $kW/m^2$) is __________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-transfer-correlations-for-flow-over-flat-plates-and-through-pipes
0
answers
0
votes
GATE2016-3-40
The water jet exiting from a stationary tank through a circular opening of diameter $300 \: mm$ impinges on a rigid wall as shown in the figure. Neglect all minor losses and assume the water level in the tank to remain constant. The net horizontal force experienced by the wall is ___________ $kN$. Density of water is $1000 \: kg/m^3$. Acceleration due to gravity $g=10 \: m/s^2$.
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-3-39
Consider a fully developed steady laminar flow of an incompressible fluid with viscosity $μ$ through a circular pipe of radius $R$. Given that the velocity at a radial location of $R/2$ from the centerline of the pipe is $U_1$, the shear stress at the wall is $KμU_1$/$R$, where $K$ is __________
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2016-3-19
The blade and fluid velocities for an axial turbine are as shown in the figure. The magnitude of absolute velocity at entry is $300$ $m/s$ at an angle of $65^\circ$ to the axial direction, while the magnitude of the absolute velocity at exit is ... downward direction. Given that the axial (horizontal) velocity is the same at entry and exit, the specific work (in $kJ/kg$) is__________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2016-3-18
For a heat exchanger, $\triangle T_{\text{max}}$ is the maximum temperature difference and $\triangle T_{\text{min}}$ is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. $C_{\text{min}}$ and $C_{\text{max}}$ are the minimum ... $C_{\text{max}} \triangle T_{\text{max}}$ $C_{\text{max}} \triangle T_{\text{min}}$
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-3-17
The INCORRECT statement about the characteristics of critical point of a pure substance is that there is no constant temperature vaporization process it has point of inflection with zero slope the ice directly converts from solid phase to vapor phase saturated liquid and saturated vapor states are identical
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-3-16
Grashof number signifies the ratio of inertia force to viscous force buoyancy force to viscous force buoyancy force to inertia force inertia force to surface tension force
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
fluid-mechanics
buoyancy
0
answers
0
votes
GATE2016-3-14
For a certain two-dimensional incompressible flow, velocity field is given by $2xy\hat{i}-y^2\hat{j}$ . The streamlines for this flow are given by the family of curves $x^2y^2 = \text{constant}$ $xy^2 = \text{constant}$ $2xy − y^2 \text{constant}$ $xy = \text{constant}$
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-3-13
A channel of width $450$ $mm$ branches into two sub-channels having width $300$ $mm$ and $200$ $mm$ as shown in figure. If the volumetric flow rate (taking unit depth) of an incompressible flow through the main channel is $0.9$ $m^3/s$ and the velocity ... velocity in the sub-channel of width $300$ $mm$ is _____________ $m/s$. Assume both inlet and outlet to be at the same elevation.
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-2-47
The partial pressure of the water vapour in a moist air sample of relative humidity $70\%$ is $1.6 \: kPa$,the total pressure being $101.35 \: kPa$ ... where $p_o=101.325 \: kPa$. The dry bulb temperature of the moist air sample (in $_{}^{\circ}\textrm{C}$) is
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2016-2-46
A refrigerator uses $R-134a$ as its refrigerant and operates on an ideal vapour-compression refrigeration cycle between $0.14 \: MPa$ and $0.8 \: MPa$.if the mass flow rate of refrigerant is $0.05 \: kg/s$,the rate of heat rejection to the environment is_______$kW$ ... $\text{At } P=0.8 \: MPa, \: h=93.42 \: kJ/kg, \: \text{ (saturated liquid) }$
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
refrigeration-and-air-conditioning
0
answers
0
votes
GATE2016-2-45
A reversible cycle receives $40 \: kJ$ of heat from one heat source at a temperature of $127^ \circ C$ and $37 \: kJ$ from another heat source at $97^ \circ C$. The heat rejected (in $kJ$) to the heat sink at $47^ \circ C$ is __________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-43
Two cylindrical shafts $A$ and $B$ at the same initial temperature are simultaneously placed in a furnace. The surfaces of the shafts remain at the furnace gas temperature at all times after they are introduced into the furnace. The temperature variation in the axial ... required (in hours) for the centerline of the shaft B to attain the temperature of $400^ \circ C$ is _______ .
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-42
Consider a parallel-flow heat exchanger with area $A_p$ and a counter-flow heat exchanger with area $A_c$ . In both the heat exchangers, the hot stream flowing at $1 \: kg/s$ cools from $80^\circ C$ to $50^\circ C$. For the cold stream ... exchangers are of the same fluid. Also, both the heat exchangers have the same overall heat transfer coefficient. The ratio $A_c/A_p$ is _________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-2-41
Consider a frictionless, massless and leak-proof plug blocking a rectangular hole of dimensions $2R \times L$ at the bottom of an open tank as shown in the figure. The head of the plug has the shape of a semi-cylinder of radius $R$. The tank is filled with a liquid of density $\rho$ up to the tip ... $2\rho R^2gL(1+\dfrac{\pi }{4}) \\$ $\pi R^2\rho gL \\$ $\dfrac{\pi }{2}\rho R^2gL$
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-2-40
Consider fluid flow between two infinite horizontal plates which are parallel (the gap between them being $50 \: mm$). The top plate is sliding parallel to the stationary bottom plate at a speed of $3\: m/s$. The flow between the plates is solely due to the motion of the top plate. The ... $N/m^2$. Viscosity of the fluid $μ = 0.44 \:kg/m-s$ and density $\rho = 888 \: kg/m^3$.
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-2-35
A circular metallic rod of length $250 \: mm$ is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of $0.2 \: mm$ between the rod and the wall on the right side. If the ... material of the rod is $200 \: GPa$ and the coefficient of thermal expansion is $10^{−5}$ per $_{}^{\circ}\textrm{C}$.
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-21
In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by $a, b, c$ and $d$. At which temperature will a sample get solutionized the fastest? $a$ $b$ $c$ $d$
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-2-19
Consider a simple gas turbine (Brayton) cycle and a gas turbine cycle with perfect regeneration. In both the cycles, the pressure ratio is $6$ and the ratio of the specific heats of the working medium is $1.4$. The ratio of minimum to maximum ... $K$) in the regenerative cycle. The ratio of the thermal efficiency of the simple cycle to that of the regenerative cycle is _________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinery
0
answers
0
votes
GATE2016-2-18
The heat removal rate from a refrigerated space and the power input to the compressor are $7.2$ $kW$ and $1.8$ $kW$, respectively. The coefficient of performance (COP) of the refrigerator is ______
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
refrigeration-and-air-conditioning
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
Arjun
asked
in
Thermodynamics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
thermodynamics
0
answers
0
votes
GATE2016-2-16
Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is $R_o$ and that of the inner cylinder is $R_i$ . The radiation view factor of the outer cylinder onto itself is $1-\sqrt{\dfrac{R_i}{R_o}}\\$ $\sqrt{1-\dfrac{R_i}{R_o}} \\$ $1-\dfrac{R_i}{R_o}^{1/3} \\$ $1-\dfrac{R_i}{R_o}$
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-2-15
A hollow cylinder has length $L$, inner radius $r_1$, outer radius $r_2$, and thermal conductivity $k$. The thermal resistance of the cylinder for radial conduction is $\dfrac{\ln(r_2/r_1)}{2\pi kL} \\$ $\dfrac{\ln(r_1/r_2)}{2\pi kL} \\$ $\dfrac{2\pi kL}{\ln(r_2/r_1)} \\$ $\dfrac{2\pi kL}{\ln(r_1/r_2)}$
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-2-14
Assuming constant temperature condition and air to be an ideal gas, the variation in atmospheric pressure with height calculated from fluid statics is linear exponential quadratic cubic
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2016-1-49
Heat is removed from a molten metal of mass $2$ $kg$ at a constant rate of $10$ $kW$ till it is completely solidified.The cooling curve is shown in the figure Assuming uniform temperature throughout the volume of the metal during solidification,the latent heat of fusion of metal ( in $kJ$/$kg$) is _________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-1-47
In a steam power plant operating on an ideal Rankine cycle, superheated steam enters the turbine at $3 \: MPa$ and $350^ \circ C$. The condenser pressure is $75$ $kPa$. The thermal efficiency of the cycle is ________ percent. Given data: For saturated liquid, at $P=75 \:kPa$ ... $T=350^\circ C$ (superheated steam), $h=3115.3 \: kJ/kg$, $s=6.7428 \: kJ/kg-K$
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2016-1-46
An ideal gas undergoes a reversible process in which the pressure varies linearly with volume. The conditions at the start (subscript $1$) and at the end (subscript $2$) of the process with usual notation are: $p_1 = 100 \: kPa$, $V_1 = 0.2 \: m^3$ ... $R=0.275\:kJ/kg-K$. The magnitude of the work required for the process (in $kJ$) is ________
Arjun
asked
in
Applications
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2016-1-45
For water at $25^\circ C$, $dp_s/dT_s = 0.189 \: kPa/K$ ($p_s$ is the saturation pressure in $kPa$ and $T_s$ is the saturation temperature in $K$) and the specific volume of dry saturated vapour is $43.38 \: m^3/kg$. Assume that the ... vapour. Using the Clausius-Clapeyron equation, an estimate of the enthalpy of evaporation of water at $25^\circ C$ (in $kJ / kg$) is __________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-1-44
A fluid (Prandtl number, $P_r=1$) at $500\:K$ flows over a flat plate of $1.5\:m$ length, maintained at $300\: K$. The velocity of the fluid is $10 \: m/s$. Assuming kinematic viscosity,$v=30\times 10^{-6}$ $m^2/s$, the thermal boundary layer thickness (in $mm$) at $0.5 \:m$ from the leading edge is __________
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2016-1-43
An infinitely long furnace of $0.5\:m\times 0. 4 \:m$ cross-section is shown in the figure below. Consider all surfaces of the furnace to be black. The top and bottom walls are maintained at temperature $T_1=T_3=927^\circ C$ ... loss or gain on side $1$ is_________ $W/m$. Stefan-Boltzmann constant = $5.67 \times 10^{-8}$ $W/m^2-K^4$
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-transfer-correlations-for-flow-over-flat-plates-and-through-pipes
0
answers
0
votes
GATE2016-1-42
A steel ball of $10\:mm$ diameter at $1000\:K$ is required to be cooled to $350\:K$ by immersing it in a water environment at $300\:K$. The convective heat transfer coefficient is $1000\:W/m^2-K$. Thermal conductivity of steel is $40\:W/m-K$. The time constant for the cooling process $\tau$ is $16\:s$. The time required (in $s$) to reach the final temperature is __________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-1-41
A steady laminar boundary layer is formed over a flat plate as shown in the figure. The free stream velocity of the fluid is $U_o$. The velocity profile at the inlet $a-b$ is uniform, while that at a downstream location $c-d$ ... rate, $\dot{m}_{bd}$ leaving through the horizontal section $b-d$ to that entering through the vertical section $a-b$ is ___________
Arjun
asked
in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
thermal-boundary-layer
0
answers
0
votes
GATE2016-1-40
Oil (kinematic viscosity, $v_{\text{oil}}=1.0\times 10^{-5} \:m^2/s$) flows through a pipe of $0.5$ $m$ diameter with a velocity of $10$ $m/s$. Water (kinematic viscosity, $v_w=0.89\times 10^{-6}\:m^2/s$) is flowing through a model pipe of diameter $20 \:mm$. For satisfying the dynamic similarity, the velocity of water (in $m/s$) is __________
Arjun
asked
in
Fluid Mechanics
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
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