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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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gate2020me2
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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
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Mar 1
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2.7k
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gate2020me2
fluidmechanicsandthermalscience
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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
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2.7k
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gate2020me1
numericalanswers
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turbomachinary
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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
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2.7k
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gate2020me1
numericalanswers
fluidmechanicsandthermalscience
applications
kaplanturbines
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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
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Arjun
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21.2k
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gate2019me2
fluidmechanicsandthermalscience
applications
i.cengines
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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
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Arjun
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21.2k
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gate2019me2
numericalanswers
fluidmechanicsandthermalscience
applications
i.cengines
0
votes
0
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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
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Arjun
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21.2k
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gate2019me1
fluidmechanicsandthermalscience
applications
turbomachinary
0
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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
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by
Arjun
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21.2k
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gate2019me1
fluidmechanicsandthermalscience
applications
refrigerationandairconditioning
0
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0
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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
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by
Arjun
(
21.2k
points)
gate2019me1
fluidmechanicsandthermalscience
applications
turbomachinary
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
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by
Arjun
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21.2k
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gate2019me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2019 ME1: 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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Feb 9, 2019
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Arjun
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21.2k
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gate2019me1
numericalanswers
fluidmechanicsandthermalscience
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turbomachinary
+1
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GATE201251
A refrigerator operates between $120$ kPa and $800$ kPa in an ideal vapor compression cycle with $R134a$ 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 $0.2$ kg/s. ... $R134a$ are as follows: The power required for the compressor in kW is $5.94$ $1.83$ $7.9$ $39.5$
asked
Mar 20, 2018
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by
Andrijana3306
(
1.5k
points)
gate2012me
applications
fluidmechanicsandthermalscience
refrigeration
0
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0
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GATE201250
A refrigerator operates between $120$ kPa and $800$ kPa in an ideal vapor compression cycle with $R134a$ 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 $0.2$ kg/s. ... rate at which heat is extracted, in Kj/s from the refrigerated space is $28.3$ $42.9$ $34.4$ $14.6$
asked
Mar 20, 2018
in
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by
Andrijana3306
(
1.5k
points)
gate2012me
fluidmechanicsandthermalscience
applications
refrigeration
0
votes
0
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GATE201231
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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Mar 20, 2018
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Andrijana3306
(
1.5k
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gate2012me
fluidmechanicsandthermalscience
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0
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GATE20127
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 $15 \: kPa$ ... Kinetic and potential energy changes are negligible. The power output of the turbine in MW is $6.5$ $8.9$ $9.1$ $27.0$
asked
Mar 20, 2018
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by
Andrijana3306
(
1.5k
points)
gate2012me
fluidmechanicsandthermalscience
applications
0
votes
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GATE2018123
An ideal gas undergoes a process from state $1 \: (T_1 = 300\: K, \: p_1 = 100 \: kPa)$ to state $2 \: (T_2 = 600 \; K, \: p_2 = 500 \: kPa)$. The specific heats of the ideal gas are: $C_p = 1 \: kJ/kgK$ and $C_v = 0.7 \: kJ/kgK$. The change in specific entropy of the ideal gas from state $1$ to state $2$ (in $kJ/kgK$) is ______ (correct to two decimal places).
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Feb 17, 2018
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Arjun
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21.2k
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gate2018me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2018124
For a Pelton wheel with a given water jet velocity, the maximum output power from the Pelton wheel is obtained when the ratio of the bucket speed to the water jet speed is _____ (correct to two decimal places)
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Feb 17, 2018
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Arjun
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21.2k
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gate2018me1
numericalanswers
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peltonwheel
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GATE2017 ME2: 42
In the Rankine cycle for a steam power plant, the turbine entry and exit enthalpies are $2803$ kJ/kg and $1800$ kJ/kg, respectively. The enthalpies of water at pump entry and exit are $121$ kJ/kg and $124$ kJ/kg, respectively. The specific steam consumption (in kg/kW.h) of the cycle is _________.
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Feb 27, 2017
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Arjun
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21.2k
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gate2017me2
numericalanswers
fluidmechanicsandthermalscience
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turbomachinary
0
votes
0
answers
GATE2017 ME2: 43
A calorically perfect gas (specific heat at constant pressure $1000$ J/kg .K) enters and leaves a gas turbine with the same velocity. The temperatures of the gas at turbine entry and exit are $1100$ K and $400$ K, respectively. The power produced is $4.6$ MW and heat escapes at ... casing. The mass flow rate of the gas (in kg/s) through the turbine is $6.14$ $7.00$ $7.50$ $8.00$
asked
Feb 27, 2017
in
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by
Arjun
(
21.2k
points)
gate2017me2
fluidmechanicsandthermalscience
applications
turbomachinary
0
votes
0
answers
GATE2017 ME2: 13
Which one of the following statements is TRUE? Both Pelton and Francis turbines are impulse turbines. Francis turbine is a reaction turbine but Kaplan turbine is an impulse turbine. Francis turbine is an axialflow reaction turbine. Kaplan turbine is an axialflow reaction turbine.
asked
Feb 27, 2017
in
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by
Arjun
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21.2k
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gate2017me2
fluidmechanicsandthermalscience
applications
0
votes
0
answers
GATE2017 ME1: 35
Moist air is treated as an ideal gas mixture of water vapour and dry air (molecular weight of air= $28.84$ and molecular weight of water =$18$). At a location, the total pressure is $100$ kPa, the temperature is $30^{\circ}$ C and the relative humidity is ... saturation pressure of water at $30^{\circ} C$ is $4246$ Pa, the mass of water vapour per kg of dry air is _________ grams.
asked
Feb 27, 2017
in
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by
Arjun
(
21.2k
points)
gate2017me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2017 ME1: 34
The pressure ratio across a gas turbine (for air, specific heat at constant pressure, $c_{p}=1040 J/kg.K$ and ratio of specific heats, $\gamma=1.4$) is $10$. If the inlet temperature to the turbine is $1200$ K and the isentropic efficiency is $0.9$, the gas temperature at turbine exit is ________ $K$
asked
Feb 27, 2017
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by
Arjun
(
21.2k
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gate2017me1
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinery
0
votes
0
answers
GATE2016346
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 __________
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
points)
gate2016me3
numericalanswers
fluidmechanicsandthermalscience
applications
airandgascompressors
0
votes
0
answers
GATE2016347
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 liquidvapour mixture (state $1$) and isentropically compresses it to a dry saturated vapour condition (state ... $kJ/kg$. The difference between the enthalpies at state points $1$ and $0$ (in $kJ/kg$) is ____________
asked
Feb 24, 2017
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by
Arjun
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21.2k
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gate2016me3
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2016319
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 $65^o$ ... downward direction. Given that the axial (horizontal) velocity is the same at entry and exit, the specific work (in $kJ/kg$) is__________
asked
Feb 24, 2017
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Arjun
(
21.2k
points)
gate2016me3
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinary
0
votes
0
answers
GATE2016244
A pistoncylinder device initially contains $0.4$ $m^3$ of air (to be treated as an ideal gas) at $100$ $kPa$ and $80^oC$. The air is now isothermally compressed to $0.1$ $m^3$. The work done during this process is ________ $kJ$.
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
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gate2016me2
numericalanswers
fluidmechanicsandthermalscience
applications
i.cengines
0
votes
0
answers
GATE2016246
A refrigerator uses $R134a$ as its refrigerant and operates on an ideal vapourcompression 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_______$kW$ ... $\text{At } P=0.8 \: MPa, \: h=93.42 \: kJ/kg, \: \text{ (saturated liquid) }$
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
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gate2016me2
numericalanswers
fluidmechanicsandthermalscience
applications
refrigerationandairconditioning
0
votes
0
answers
GATE2016247
The partial pressure of the water vapour in a moist air sample of relative humidity $70$% is $1.6$ $kPa$,the total pressure being $101.35$ $kPa$.moist air may be treated as an ideal gas mixture of water vapour and dry air.the relation between saturation temperature ($T_s$ in ... $p_o$=$101.325$ $kPa$.The dry bulb temperature of the moist air sample (in $_{}^{o}\textrm{C}$) is
asked
Feb 24, 2017
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by
Arjun
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21.2k
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gate2016me2
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2016214
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
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
points)
gate2016me2
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2016218
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 ______
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
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gate2016me2
numericalanswers
fluidmechanicsandthermalscience
applications
refrigerationandairconditioning
0
votes
0
answers
GATE2016219
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 _________
asked
Feb 24, 2017
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Arjun
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21.2k
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gate2016me2
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinery
0
votes
0
answers
GATE2016146
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: $p_1$ = $100$ $kPa$, $V_1$ = $0.2$ $m^3$ and $p_2$ = ... the gas constant, $R$ = $0.275$ $kJ$/$kg$$K$. The magnitude of the work required for the process (in $kJ$) is ________
asked
Feb 24, 2017
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by
Arjun
(
21.2k
points)
gate2016me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2016147
In a steam power plant operating on an ideal Rankine cycle, superheated steam enters the turbine at $3$ $MPa$ and $350^oC$. The condenser pressure is $75$ $kPa$. The thermal efficiency of the cycle is ________ percent. Given data: For saturated liquid, at $P$ = $75$ $kPa$, $h_f$ = $384.39$ ... $T$ = $350^oC$ (superheated steam), $h$ = $3115.3$ $kJ$/$kg$, $s$ = $6.7428$ $kJ$/$kg$$K$
asked
Feb 24, 2017
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Arjun
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21.2k
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gate2016me1
numericalanswers
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2016118
Consider two hydraulic turbines having identical specific speed and effective head at the inlet. If the speed ratio $\displaystyle{\left(\frac{N_1}{N_2}\right)}$ of the two turbines is $2$, then the respective power ratio $\displaystyle{\left(\frac{P_1}{P_2}\right)}$ is _____________
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Arjun
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21.2k
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gate2016me1
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinery
0
votes
0
answers
GATE2016119
The INCORRECT statement about regeneration in vapor power cycle is that it increases the irreversibility by adding the liquid with higher energy content to the steam generator heat is exchanged between the expanding fluid in the turbine and the compressed ... the principle is similar to the principle of Stirling gas cycle it is practically implemented by providing feed water heaters
asked
Feb 24, 2017
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Arjun
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21.2k
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gate2016me1
fluidmechanicsandthermalscience
applications
0
votes
0
answers
GATE2015347
The torque (in $N$$m$) exerted on the crank shaft of a two stroke engine can be described as $T = 10000 + 1000 \sin(2θ) − 1200 \cos(2θ)$, where $θ$ is the crank angle as measured from inner dead center position. Assuming the resisting torque to be constant, the power (in $kW$) developed by the engine at $100$ $rpm$ is ________
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
points)
gate2015me3
numericalanswers
fluidmechanicsandthermalscience
applications
i.cengines
0
votes
0
answers
GATE2015352
Which of the following statements are TRUE, when the cavitation parameter $\sigma =0$? the local pressure is reduced to vapor pressure cavitation starts boiling of liquid starts cavitation stops (i), (ii) and (iv) only (ii) and (iii) only (i) and (iii) (i), (ii) and (iii)
asked
Feb 24, 2017
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by
Arjun
(
21.2k
points)
gate2015me3
fluidmechanicsandthermalscience
applications
vapourandgaspowercycles
0
votes
0
answers
GATE2015337
Refrigerant vapor enters into the compressor of a standard vapor compression cycle at −$10^oC$ ($h$ = $402$ $kJ/kg$) and leaves the compressor at $50^oC$ ($h$ = $432$ $kJ/kg$). It leaves the condenser at $30^oC$ ($h$ = $237$ $kJ/kg$). The COP of the cycle is ________
asked
Feb 24, 2017
in
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by
Arjun
(
21.2k
points)
gate2015me3
numericalanswers
fluidmechanicsandthermalscience
applications
refrigerationandairconditioning
0
votes
0
answers
GATE2015338
Steam enters a turbine at $30$ bar, $300^oC$ ($u$ = $2750$ $kJ/kg$, $h$ = $2993$ $kJ/kg$) and exits the turbine as saturated liquid at $15$ $kPa$ ($u$ = $225$ $kJ/kg$, $h$ = $226$ $kJ/kg$). Heat loss to the ... $kJ/kg$ of steam) is ________
asked
Feb 24, 2017
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by
Arjun
(
21.2k
points)
gate2015me3
numericalanswers
fluidmechanicsandthermalscience
applications
turbomachinery
0
votes
0
answers
GATE2015325
An airstandard Diesel cycle consists of the following processes: $1$$2$: Air is compressed isentropically. $2$$3$: Heat is added at constant pressure. $3$$4$: Air expands isentropically to the original volume. $4$$1$: Heat is rejected at constant volume. If $\gamma$ ... $1\displaystyle{\frac{\gamma (T_4T_1)}{T_3T_2}}$ $1\displaystyle{\frac{T_4T_1}{(\gamma 1)(T_3T_2)}}$
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21.2k
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gate2015me3
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dieselcycle
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