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A steam turbine has an inlet of 2 kg/* water at 1000 kPa, 350°C and velocity of 15 m/*. The exit is at 100 kPa, x = 1 and very
asked
Apr 6, 2019
in
Mathematics
by
kratos
turbines
available energy
thermodynamics
reversible work
law efficiency
expanders
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1
answer
A computer chip dissipates 2 kJ of electric work over time and rejects that as heat transfer from its 50°C surface to 25°C air.
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Apr 1, 2019
in
Mathematics
by
kratos
energy equation
available energy
thermodynamics
carnot cycles
reversible work
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1
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Find the specific reversible work for a steam turbine with inlet 4 MPa, 500°C and an actual exit state of 100 kPa, x = 1.0 with a 25°C ambient.
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Mar 31, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
law efficiency
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1
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A control mass gives out 10 kJ of energy in the form of a. Electrical work from a battery b. Mechanical work from a spring
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Mar 25, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
+2
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1
answer
The surface temperature of the sun is estimated as (a) 6000 °C (b) 12000 °C
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Mar 23, 2019
in
Class 11
by
kratos
arithmetic progressions
class-11
available energy
thermodynamics
irreversibility
reversible work
sequences and series
kinetic theory
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1
answer
Water at 100 kPa, 150°C receives 75 kJ/kg in a reversible process by heat transfer. Which process changes * the most:
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Mar 13, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible processes
reversible work
polytropic processes
steady state
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1
answer
A household freezer operates in a room at 20°C. Heat must be transferred from the cold space at a rate of 2 kW to maintain
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Mar 10, 2019
in
Mathematics
by
kratos
carnot cycles
thermodynamics
available energy
inequality of clausius
reversible work
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1
answer
Air in a rigid 1 m^3 box is at 300 K, 200 kPa. It is heated to 600 K by heat transfer from a reversible heat pump that receives energy
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Mar 7, 2019
in
Mathematics
by
kratos
carnot cycles
thermodynamics
reversible processes
entropy of ideal gases
available energy
reversible work
polytropic processes
steady state
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1
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A steam turbine receives steam at 6 MPa, 800°C. It has a heat loss of 49.7 kJ/kg and an isentropic efficiency of 90%. For an exit pressure of 15 kPa
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Feb 9, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
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1
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The freezer in a refrigerator is located at the top section so that
asked
Feb 2, 2019
in
JEE
by
kratos
class-11
jee
available energy
thermodynamics
reversible work
jee mains
heat and thermodynamics
heat
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1
answer
An electrical motor on 15V supply draws a current of 5A and yields mechanical powers of 60W,the energy lost as heat in one hour(in kj)v
asked
Jan 2, 2019
in
Class 10
by
kratos
cbse
magnetic effects of electric current
electricity
available energy
thermodynamics
class-9
class-10
reversible work
electromagnetism
magnetism
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votes
1
answer
A heat engine receives 1 kW heat transfer at 1000 K and gives out 600 W as work with the rest as heat transfer to the ambient.
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Dec 30, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible processes
inequality of clausius
reversible work
steady state
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votes
1
answer
A heat engine receives 5 kW at 800 K and 10 kW at 1000 K rejecting energy by heat transfer at 600 K. Assume it is reversible
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Dec 29, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
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1
answer
Consider a household refrigerator that has just been filled up with roomtemperature food.
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Dec 26, 2018
in
Class 10
by
kratos
cbse
available energy
thermodynamics
class-10
reversible work
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votes
1
answer
A rock bed consists of 6000 kg granite and is at 70°C. A small house with lumped mass of 12000 kg wood and 1000 kg iron is at 15°C.
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Dec 20, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
irreversibility
reversible work
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1
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Assume both the compressor and the nozzle in Air at 100 kPa, 17°C is compressed to 400 kPa after which it is expanded through a nozzle b
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Dec 17, 2018
in
Mathematics
by
kratos
bernoulli
availability
available energy
thermodynamics
reversible work
steady single flow devices
processes multiple devices
reversible shaft work
steady state
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votes
1
answer
A household refrigerator has a freezer at TF and a cold space at TC from which energy is removed and rejected to the ambient at
asked
Dec 11, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
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1
answer
A compressor receives R-134a at –10°C, 200 kPa with an exit of 1200 kPa, 50°C. What can you say about
asked
Oct 7, 2018
in
Mathematics
by
kratos
compressors
fans
available energy
thermodynamics
reversible processes
reversible work
pipe
pumps
steady state
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1
answer
A compressor receives R-134a at 20 F, 30 psia with an exit of 200 psia, x = 1. What can you say about the process?
asked
Sep 10, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible processes
reversible work
steady single flow devices
steady state
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votes
1
answer
An air flow of 5 kg/min at 1500 K, 125 kPa goes through a constant pressure heat exchanger, giving energy to a heat engine .
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Sep 4, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
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