Air at 8 bar 100°C flows in a duct of 15 cm diameter at rate of 150 kg/min. It is throttled by upto 4 bar pressure. Determine the velocity of air after throttling and also show that enthalpy constant before and after throttling. Ans. 37.8 m/s
Air at 8 bar 100°C flows in a duct of 15 cm diameter at rate of 150 kg/min. It is throttled by upto 4 bar pressure. Determine the velocity of air after throttling and also show that enthalpy constant before and after throttling. Ans. 37.8 m/s
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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![a. Air at 8 bar 100°C flows in a duct of 15 cm diameter at rate of 150 kg/min. It is throttled by upto
4 bar pressure. Determine the velocity of air after throttling and also show that enthalpy constant
before and after throttling.
b,
Ans. 37.8 m/s
1. Determine the power required by a compressor designed to compress atmospheric through inlet
area of 90 cm? with velocity of 50 m/s and leaves with velocity of 120 m/s from exit area of 5
cm?. Consider heat losses to environment to be 10% of power input to compressor.
Ans. 50.4 kw
C' Determine the power available from a steam turbine with following details;
Steam flow rate = 1 kg/s
Velocity at inlet and exit = 100 m/s and 150 m/s
Enthalpy at inlet and exit = 2900 kJ/kg, 1600 k]/kg
Change in potential energy may be assumed negligible.
Ans. 1293.75 kw
d. Determine the heat transfer in emptying of a rigid tank of 1 m² volume containing air at 3 bar and
27°C initially. Air is allowed to escape slowly by opening a valve until the pressure in tank drops
to 1 bar pressure. Consider escape of air in tank to follow polytrophic process with index n = 1.2
Ans. 76.86 kJ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F27c7a060-7d8c-4e26-9eb3-57a6aae84b47%2Fe649e8ba-9dee-473a-b4c0-d7aecb0ca09a%2F7yjunbq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:a. Air at 8 bar 100°C flows in a duct of 15 cm diameter at rate of 150 kg/min. It is throttled by upto
4 bar pressure. Determine the velocity of air after throttling and also show that enthalpy constant
before and after throttling.
b,
Ans. 37.8 m/s
1. Determine the power required by a compressor designed to compress atmospheric through inlet
area of 90 cm? with velocity of 50 m/s and leaves with velocity of 120 m/s from exit area of 5
cm?. Consider heat losses to environment to be 10% of power input to compressor.
Ans. 50.4 kw
C' Determine the power available from a steam turbine with following details;
Steam flow rate = 1 kg/s
Velocity at inlet and exit = 100 m/s and 150 m/s
Enthalpy at inlet and exit = 2900 kJ/kg, 1600 k]/kg
Change in potential energy may be assumed negligible.
Ans. 1293.75 kw
d. Determine the heat transfer in emptying of a rigid tank of 1 m² volume containing air at 3 bar and
27°C initially. Air is allowed to escape slowly by opening a valve until the pressure in tank drops
to 1 bar pressure. Consider escape of air in tank to follow polytrophic process with index n = 1.2
Ans. 76.86 kJ
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