Login
Login
Register
Questions
Unanswered
Tags
Categories
Ask a Question
Ask a Question
Recent questions tagged rates or fluxes of entropy
+1
vote
1
answer
A cylinder with a piston restrained by a linear spring contains 2 kg of carbon dioxide at 500 kPa, 400°C. It is cooled to 40°C,
asked
Apr 4, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
energy equation
ideal gas
+1
vote
1
answer
A room is heated with a 1500 W electric heater. How much power can be saved if a heat pump with a COP of 2.0
asked
Mar 22, 2019
in
Class 9
by
kratos
cbse
work and energy
thermodynamics
class-9
the second law of thermodynamics
rates or fluxes of entropy
+2
votes
1
answer
A system * receives heat continuously from an electrical heater of power 10 W.
asked
Mar 9, 2019
in
JEE
by
kratos
class-11
jee
thermodynamics
rates or fluxes of entropy
jee main
heat
+2
votes
1
answer
A reversible heat pump uses 1 kW of power input to heat a 78 F room, drawing energy from the outside at 60 F. Assume every process
asked
Feb 22, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
+2
votes
1
answer
A piston/cylinder with constant loading of piston contains 1 L water at 400 kPa, quality 15%. It has some stops mounted so the maximum possible
asked
Feb 8, 2019
in
Mathematics
by
kratos
compressibility factor
thermodynamics
rates or fluxes of entropy
entropy of a liquid or a solid
boundary work
+2
votes
1
answer
Two tanks contain steam, and they are both connected to a piston/cylinder . Initially the piston is at the bottom and the mass of the piston
asked
Feb 2, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
+3
votes
1
answer
A heat pump has a coefficient of performance of 2 using a power input of 2 kW. Its low temperature is To and the high temperature is 80°C,
asked
Jan 21, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
+2
votes
1
answer
The automatic transmission in a car receives 25 kW shaft work and gives out 24 kW to the drive shaft. The balance is dissipated in the hydraulic fluid
asked
Jan 18, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
+1
vote
1
answer
A closed tank, V = 0.35 ft^3, containing 10 lbm of water initially at 77 F is heated to 350 F by a heat pump that is receiving heat
asked
Jan 13, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
steady single flow devices
+1
vote
1
answer
A farmer runs a heat pump with a motor of 2 kW. It should keep a chicken hatchery at 30°C which loses energy at a rate of 0.5 kW
asked
Jan 12, 2019
in
Mathematics
by
kratos
refrigerators
heat engines
thermodynamics
rates or fluxes of entropy
heat transfer
+2
votes
1
answer
First the balloon is held fastened to the ground and the internal air is heated to steady-state temperature of θ3 = 110° C.
asked
Jan 12, 2019
in
Class 11
by
kratos
trigonometry
class-11
thermodynamics
rates or fluxes of entropy
properties of matter
class-10
sequences and series
trigonometric functions
+2
votes
1
answer
An insulated piston/cylinder contains R-22 at 20°C, 85% quality, at a cylinder volume of 50 L. A valve at the closed end of the cylinder
asked
Jan 12, 2019
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
compressibility factor
energy equation
+2
votes
1
answer
A cylinder/piston contains 5 lbm of water at 80 lbf/in.^2, 1000 F. The piston has cross-sectional area of 1 ft^2 and is restrained by a linear spring
asked
Dec 29, 2018
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
irreversibility
ideal gas
+2
votes
1
answer
Find the second law efficiency of the heat pump has a coefficient of performance of 2 using a power input of 2 kW. Its low temperature
asked
Dec 8, 2018
in
Mathematics
by
kratos
thermodynamics
the second law of thermodynamics
rates or fluxes of entropy
device efficiency
+2
votes
1
answer
A small halogen light bulb receives an electrical power of 50 W. The small filament is at 1000 K and gives out 20% of the power as light
asked
Dec 7, 2018
in
Mathematics
by
kratos
rates or fluxes of entropy
thermodynamics
+3
votes
1
answer
A cylinder/piston contains 3 kg of water at 500 kPa, 600°C. The piston has a cross-sectional area of 0.1 m^2 and is restrained by a linear spring
asked
Dec 5, 2018
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
energy equation
+3
votes
1
answer
A substance is compressed adiabaticly so P and T go up. Does that change *?
asked
Dec 3, 2018
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
+2
votes
1
answer
What will happen to the space shown in the following when heated ?
asked
Nov 30, 2018
in
Class 12
by
kratos
p-block elements
thermodynamics
rates or fluxes of entropy
class-10
class-6
carbon and its compounds
magnetism
class-12
+2
votes
1
answer
If the pressure in a flow is constant, can you have shaft work?
asked
Nov 27, 2018
in
Mathematics
by
kratos
throttle flow
thermodynamics
rates or fluxes of entropy
reversible processes
steady state
+1
vote
1
answer
A cylinder is fitted with a 4-in.-diameter piston that is restrained by a linear spring (force proportional to distance)
asked
Nov 23, 2018
in
Mathematics
by
kratos
thermodynamics
rates or fluxes of entropy
irreversibility
compressibility factor
To see more, click for the
full list of questions
or
popular tags
.
