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Can you say something about changes in m and V through a steady flow device?
asked
Feb 4, 2019
in
Mathematics
by
kratos
compressors
fans
availability
thermodynamics
steady single flow devices
device efficiency
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vote
1
answer
A 4 kg/* steady flow of ammonia runs through a device where it goes through a polytropic process. The inlet state is 150 kPa,
asked
Feb 1, 2019
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+3
votes
1
answer
The self inductance of the motor of an electric fan is 10 H. In order to impart maximum power at 50 Hz,
asked
Jan 29, 2019
in
JEE
by
kratos
electromagnetic induction
compressors
fans
transients
jee
thermodynamics
jee mains
alternating current
class-12
electromagnetic induction and alternating current
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vote
1
answer
An air compressor is used to charge an initially empty 200-L tank with air up to 5 MPa. The air inlet to the compressor is at 100 kPa, 17°C
asked
Jan 25, 2019
in
Mathematics
by
kratos
compressors
fans
compressibility factor
availability
thermodynamics
+3
votes
1
answer
A compressor brings R-134a from 150 kPa, -10°C to 1200 kPa, 50°C. It is water cooled with a heat loss estimated as 40 kW
asked
Jan 16, 2019
in
Mathematics
by
kratos
fans
thermodynamics
compressors
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vote
1
answer
A compressor in a commercial refrigerator receives R-22 at -25°C, x = 1. The exit is at 800 kPa, 40°C.
asked
Dec 21, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+2
votes
1
answer
A stream of ammonia enters a steady flow device at 100 kPa, 50°C, at the rate of 1 kg/*. Two streams exit the device at equal mass
asked
Dec 8, 2018
in
Mathematics
by
kratos
nozzles
compressors
fans
availability
diffusers
thermodynamics
bernoulli equation
reversible shaft work
+2
votes
1
answer
An exhaust fan in a building should be able to move 2.5 kg/* air at 98 kPa, 20°C through a 0.4 m diameter vent ****.
asked
Nov 10, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
single flow devices
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vote
1
answer
In a steady state single flow * is either constant or it increases. Name the process.
asked
Nov 6, 2018
in
Mathematics
by
kratos
compressors
fans
bernoulli
thermodynamics
steady single flow devices
reversible shaft work
exergy balance equation
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vote
1
answer
How much power is needed to run the fan in Problem 6.29? A household fan of diameter 0.75 m takes air in at 98 kPa,
asked
Oct 17, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+2
votes
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
+3
votes
1
answer
An ordinary portable fan blows 0.2 kg/* room air with a velocity of 18 m/*. What is the minimum power electric motor
asked
Aug 17, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+2
votes
1
answer
A polytropic flow process with n = 0 might be which device?
asked
Aug 14, 2018
in
Mathematics
by
kratos
compressors
fans
thermodynamics
bernoulli equation
polytropic processes
reversible shaft work
+3
votes
1
answer
A gas turbine setup to produce power during peak demand is . The turbine provides power to the air compressor
asked
Aug 13, 2018
in
Mathematics
by
kratos
compressors
fans
thermodynamics
reversible processes
exergy balance equation
steady state
+3
votes
1
answer
An exhaust fan in a building should be able to move 5 lbm/* air at 14.4 psia, 68 F through a 1.25 ft diameter vent ****.
asked
Aug 9, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
single flow devices
+1
vote
1
answer
A condenser (cooler) receives 0.05 kg/* R-22 at 800 kPa, 40°C and cools it to 15°C. There is a small pressure drop so the exit state
asked
Jul 8, 2018
in
Mathematics
by
kratos
compressors
fans
thermodynamics
reversible processes
heaters coolers
steady state
+1
vote
1
answer
An air compressor takes in air at 100 kPa, 17°C and delivers it at 1 MPa, 600 K to a constant-pressure cooler,
asked
Apr 30, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+3
votes
1
answer
The compressor of a large gas turbine receives air from the ambient at 95 kPa, 20°C, with a low velocity.
asked
Apr 17, 2018
in
Mathematics
by
kratos
thermodynamics
compressors
fans
+2
votes
1
answer
A reciprocating air compressor takes in 2m^3/min of air at 0.11MPa and 20°C which it delivers at 1.5MPa and 111°C
asked
Apr 2, 2018
in
Mathematics
by
kratos
compressors
multiple devices
fans
thermodynamics
cycle processes
the first law of thermodynamics
+2
votes
1
answer
Compression and heat transfer brings R-134a in a piston/cylinder from 500 kPa, 50°C to saturated vapor in an isothermal process.
asked
Mar 28, 2018
in
Mathematics
by
kratos
polytropic process
compressors
energy equation
fans
thermodynamics
polytropic processes
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