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Recent questions tagged fluidmechanicsandthermalscience
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GATE2020ME28
A lossless transmission line with $0.2$ pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to $80\%$ of its length by a distance relay placed at the generator bus. The generator terminal voltage ... a solid three phasetoground fault on the transmission line is closest to: $1.00$ $3.61$ $5.00$ $6.25$
asked
Mar 1
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by
jothee
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gate2020me2
fluidmechanicsandthermalscience
applications
0
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0
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GATE2020ME29
Out of the following options, the most relevant information needed to specify the real power $(P)$ at the $PV$ buses in a load flow analysis is solution of economic load dispatch rated power output of the generator rated voltage of the generator base power of the generator
asked
Mar 1
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by
jothee
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2.7k
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gate2020me2
fluidmechanicsandthermalscience
applications
0
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GATE2020ME1: 11
Match the following ... $P3,\:Q3,\:R1\:,S3$ $P4,\:Q3,\:R2\:,S1$
asked
Feb 19
in
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by
jothee
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2.7k
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gate2020me1
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2020ME1: 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
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Feb 19
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by
jothee
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2.7k
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gate2020me1
fluidmechanicsandthermalscience
fluidmechanics
buoyancy
0
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0
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GATE2020ME1: 15
Match the following nondimensional numbers with the corresponding definitions: ... $P3, Q1, R2, S4$ $P4, Q3, R1, S2$ $P3, Q1, R4, S2$
asked
Feb 19
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by
jothee
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2.7k
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gate2020me1
fluidmechanicsandthermalscience
fluidmechanics
0
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0
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GATE2020ME1: 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$ $4xz – 6xy$ $4xy + 4xz$
asked
Feb 19
in
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by
jothee
(
2.7k
points)
gate2020me1
fluidmechanicsandthermalscience
fluidmechanics
0
votes
0
answers
GATE2020ME1: 17
For an ideal gas, the value of the JouleThomson coefficient is positive negative zero indeterminate
asked
Feb 19
in
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by
jothee
(
2.7k
points)
gate2020me1
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2020ME1: 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 ... $\dfrac{C_{P}}{C_{V}}$ $\dfrac{C_{P}C_{V}}{C_{V}}$ $\dfrac{C_{V}}{C_{P}}$
asked
Feb 19
in
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by
jothee
(
2.7k
points)
gate2020me1
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2020ME1: 24
The compressor of a gas turbine plant, operating on an ideal intercooled Brayton cycle, accomplishes an overall compression ratio of $6$ in a twostage 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).
asked
Feb 19
in
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by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinary
0
votes
0
answers
GATE2020ME1: 25
In a concentric tube counterflow 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
heattransfer
heatexchanger
0
votes
0
answers
GATE2020ME1: 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 $283.3$ $299.8$ $149.9$ $449.7$
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2020ME1: 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 $\text{AB}$, as shown in the figure, is proportional to $D^{n}$. The value of $n$ is ________.
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2020ME1: 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
0
votes
0
answers
GATE2020ME1: 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2020ME1: 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2020ME1: 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2020ME1: 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).
asked
Feb 19
in
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by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
applications
kaplanturbines
0
votes
0
answers
GATE2020ME1: 55
The indicated power developed by an engine with compression ratio of $8$, is calculated using an airstandard 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).
asked
Feb 19
in
Others
by
jothee
(
2.7k
points)
gate2020me1
numericalanswers
fluidmechanicsandthermalscience
i.cengines
0
votes
0
answers
GATE2019 ME2: 23
Water enters a circular pipe of length $L=5.0$ m and diameter $D=0.20$m with Reynolds number $Re_D=500$. The velocity profile at the inlet of the pipe is uniform while it is parabolic at the exit. The Reynolds number at the exit of the pipe is _________
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME2: 24
A thin vertical flat plate of height $L$, and infinite width perpendicular to the plane of the figure, is losing heat to the surroundings by natural convection. The temperatures of the plate and the surroundings by natural convection. The temperatures of the plate and the ... plate is $h_1$ and that for the second plate is $h_2$, the value of the ratio $h_1/h_2$ is ____________
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2019 ME2: 33
The figure shows a heat engine (HE) working between two reservoirs. The amount of heat $(Q_2)$ rejected by the heat engine is drawn by a heat pump (HP). The heat pump receives the entire work output $(W)$ of the heat engine. If temperatures, $T_1 >T_3>T_2$, then the relation between ... $\text{COP}= 1 + \eta$ $\text{COP}= \eta^{1}$ $\text{COP}= \eta^{1} 1 $
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me2
fluidmechanicsandthermalscience
applications
i.cengines
0
votes
0
answers
GATE2019 ME2: 43
Water flows through two different pipes $A$ and $B$ of the same circular crosssection but at different flow rates. The length of pipe $A$ is $1.0 \: m$ and that of pipe $B$ is $2.0 \: m$. The flow in both the pipes is laminar and fully ... head loss across the length of the pipes is same, the ratio of volume flow rates $Q_B/Q_A$ is __________ (round off to two decimal places).
asked
Feb 9, 2019
in
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by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME2: 46
Hot and cold fluids enter a parallel flow double tube heat exchanger at $100^{\circ}C$ and $15^{\circ} C$, respectively. The heat capacity rates of hot and cold fluids are $C_h=2000 \: W/K$ and $C_c =1200 \: W/K$, respectively. If the outlet ... $45^{\circ} C$, the log mean temperature difference (LMTD) of the heat exchanger is __________ $K$ (round off to two decimal places).
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
heattransfer
heatexchanger
0
votes
0
answers
GATE2019 ME2: 47
Water flowing at the rate of $1$ kg/s through a system is heated using an electric heater such that the specific enthalpy of the water increases by $2.50 \: kJ/kg$ and the specific entropy increases by $0.007 \: kJ/kg \cdot K$. The power input ... an ambient temperature of $300 \: K$, the irreversibility rate of the system is __________ $kW$ (round off to two decimal places).
asked
Feb 9, 2019
in
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by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME2: 48
An idealized centrifugal pump (blade outer radius of $50 \: mm$) consumes $2 \: kW$ power while running at $3000 \: rpm$. The entry of the liquid into the pump is axial and exit from the pump is radial with respect to impeller. If the losses are neglected, then the mass flow rate of the liquid through the pump is ___________ $kg/s$ (round off to two decimal places)
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
0
votes
0
answers
GATE2019 ME2: 49
An air standard Otto cycle has thermal efficiency of $0.5$ and the mean effective pressure of the cycle is $1000 \: kPa$. For air, assume specific heat ratio $\gamma=1.4$ and specific gas constant $R=0.287 \: kJ/kg \cdot K$. If the pressure and ... $300 \: K$, respectively, then the specific net work output of the cycle is _____ $kJ/kg $ (round off to two decimal places).
asked
Feb 9, 2019
in
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by
Arjun
(
21.2k
points)
gate2019me2
numericalanswers
fluidmechanicsandthermalscience
applications
i.cengines
0
votes
0
answers
GATE2019 ME1: 8
During a nonflow thermodynamic process $(12)$ executed by a perfect gas, the heat interaction is equal to the work interaction $(Q_{12} = W_{12})$ when the process is Isentropic Polytropic Isothermal Adiabatic
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2019 ME1: 9
For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant crosssection, the Nusselt number at constant wall heat flux $(Nu_q)$ and that at constant wall temperature $(Nu_T)$ are related as $Nu_q > Nu_T$ $Nu_q < Nu_T$ $Nu_q = Nu_T$ $Nu_q = (Nu_T)^2$
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME1: 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
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
applications
turbomachinary
0
votes
0
answers
GATE2019 ME1: 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 $k_1+k_2 \\$ $\sqrt{k_1k_2} \\$ $\frac{k_1k_2}{k_1+k_2} \\$ $\frac{2k_1k_2}{k_1+k_2}$
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2019 ME1: 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
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
applications
refrigerationandairconditioning
0
votes
0
answers
GATE2019 ME1: 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 _______
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2019 ME1: 23
Water flows through a pipe with a velocity given by $\overrightarrow{V}= \big( \frac{4}{t}+x+y \big) \hat{j} \: m/s$, 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 ______$m/s^2$
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME1: 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 ______
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2019 ME1: 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
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
applications
turbomachinary
0
votes
0
answers
GATE2019 ME1: 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
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
fluidmechanics
flowthroughpipes
0
votes
0
answers
GATE2019 ME1: 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 ... $32^{\circ} C$ $37^{\circ} C$ $53^{\circ} C$ $76^{\circ} C$
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2019 ME1: 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 nonuniform 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 ______$^{\circ} C$.
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
heattransfer
0
votes
0
answers
GATE2019 ME1: 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. $(R=8.314 \: J/mol \cdot K)$
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
thermodynamics
0
votes
0
answers
GATE2019 ME1: 49
A steam power cycle with regeneration as shown below on the $Ts$ 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 _______
asked
Feb 9, 2019
in
Others
by
Arjun
(
21.2k
points)
gate2019me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
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