GO Mechanical
Login
Register
@
Dark Mode
Profile
Edit my Profile
Messages
My favorites
Register
Activity
Questions
Tags
Users
Ask
New Blog
Blogs
Exams
Dark Mode
Recent questions tagged applications
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: 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: 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
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: 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
GATE2019 ME-2: 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 $
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
fluid-mechanics-and-thermal-science
applications
i.c-engines
0
answers
0
votes
GATE2019 ME-2: 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).
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
i.c-engines
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
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
turbomachinary
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
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
refrigeration-and-air-conditioning
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
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
applications
turbomachinary
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 _______
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
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)
Arjun
asked
in
Applications
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinary
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 $0.2$ ... $5.94$ $1.83$ $7.9$ $39.5$
Andrijana3306
asked
in
Applications
Mar 20, 2018
by
Andrijana3306
1.5k
points
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 $28.3$ $42.9$ $34.4$ $14.6$
Andrijana3306
asked
in
Applications
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
applications
refrigeration
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 $67 \%$ $55 \%$ $83 \%$ $71 \%$
Andrijana3306
asked
in
Applications
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
applications
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 $6.5$ $8.9$ $9.1$ $27.0$
Andrijana3306
asked
in
Applications
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
applications
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)
Arjun
asked
in
Applications
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
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).
Arjun
asked
in
Applications
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2018-1-24
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)
Arjun
asked
in
Applications
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
pelton-wheel
0
answers
0
votes
GATE2018-1-23
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: $C_p = 1 \: kJ/kg-K$ and $C_v = 0.7 \: kJ/kg-K$. The change in specific entropy of the ideal gas from state $1$ to state $2$ (in $kJ/kg-K$) is ______ (correct to two decimal places).
Arjun
asked
in
Applications
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2017 ME-2: 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 $4.6\: MW$ ... turbine casing. The mass flow rate of the gas (in $kg/s$) through the turbine is $6.14$ $7.00$ $7.50$ $8.00$
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2017 ME-2: 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 _________.
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinary
0
answers
0
votes
GATE2017 ME-2: 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 axial-flow reaction turbine. Kaplan turbine is an axial-flow reaction turbine.
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
applications
0
answers
0
votes
GATE2017 ME-1: 41
Two disks $A$ and $B$ with identical mass $(m)$ and radius $(R)$ are initially at rest. They roll down from the top of identical inclined planes without slipping. Disk $A$ has all of its mass concentrated at the rim, while Disk $B$ has its mass uniformly distributed. At the bottom of the ... centre of disk $B$ is $\sqrt{\dfrac{3}{4}} \\$ $\sqrt{\dfrac{3}{2}} \\$ $1 \\$ $\sqrt{2}$
Arjun
asked
in
Theory of Machines
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
theory-of-machines
applications
0
answers
0
votes
GATE2017 ME-1: 36
Air contains $79\%$ $N_{2}$ and $21\%$ $O_{2}$ on a molar basis. Methane $(CH_{4})$ is burned with $50\%$ excess air than required stoichiometrically. Assuming complete combustion of methane, the molar percentage of $N_{2}$ in the products is _______.
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
applications
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2017 ME-1: 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.
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
vapour-and-gas-power-cycles
0
answers
0
votes
GATE2017 ME-1: 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 ________ $K$
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
applications
turbomachinery
0
answers
0
votes
GATE2017 ME-1: 33
One kg of an ideal gas (gas constant, $R= 400 J/kg.K$; specific heat at constant volume, $c_{v}=1000 J/kg.K$) at $1$ bar, and $300$ K is contained in a sealed rigid cylinder. During an adiabatic process, $100$ kJ of work is done on the system by a stirrer. The increase in entropy of the system is _______ $J/K$.
Arjun
asked
in
Applications
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
applications
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
GATE2016-3-19
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
GATE2016-2-47
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
GATE2016-2-19
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
Page:
1
2
3
next »
Welcome to GO Mechanical, where you can ask questions and receive answers from other members of the community.
Recent Posts
GATE Mechanical Engineering Syllabus for GATE 2022 (Updated 2020)
ISRO Questions Papers for Mechanical
ISRO Mechanical and RAC Previous Year Papers
How to Apply to Colleges after GATE
GATE Mechanical Syllabus
Top Users
Aug 2022