1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter is 4 mm. What is the approximate mass in kg of the weights required?
1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter is 4 mm. What is the approximate mass in kg of the weights required?
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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![1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter
is 4 mm. What is the approximate mass in kg of the weights required?
2. A gas is confined in a 0.47 m diameter cylinder by a piston, on which rests a weight.
The mass of the piston and weight together is 150 kg. The local acceleration of gravity
is 9.813 m's-2, and atmospheric pressure is 101.57 kPa.
(a) What is the force in newtons exerted on the gas by the atmosphere, the piston,
and the weight, assuming no friction between the piston and cylinder?
(b) What is the pressure of the gas in kPa?
(c) If the gas in the cylinder is heated, it expands, pushing the piston and weight
upward. If the piston and weight are raised 0.83 m, what is the work done by the
gas in kJ? What is the change in potential energy of the piston and weight?
3. Steam at 1400 kPa and 350°C [state 1] enters a turbine through a pipe that is 8 cm in
diameter, at a mass flow rate of 0.1 kg: s-1. The exhaust from the turbine is carried
through a 25-cm-diameter pipe and is at 50 kPa and 100°C [state 2]. What is the power
output of the turbine?
4. One mole of gas in a closed system undergoes a four-step thermodynamic cycle. Use
the data given in the following table to determine numerical values for the missing
quantities indicated by question marks.
Step
-200
?
-6000
?
-3800
?
?
-800
300
4700
?
?
?
-1400
5. A gas in a piston-cylinder assembly undergoes an expansion process from an initial
pressure of 3 bar and initial volume of to a final volume of . During the expansion
process the relationship between pressure and volume is given by . Determine the
workdone if
6. One mole of a monoatomic ideal gas, in the initial state is subjected to the following
three processes, each of which is conducted reversibly:
A doubling of its volume at constant pressure,
Then a doubling of its pressure at constant volume
Then a return to the initial state along the path . Note: V is in liters
i.
ii.
iii.
Calculate the heat (Q) and work (W) effects which occur during each of the three
processes. Note:
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Transcribed Image Text:1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter
is 4 mm. What is the approximate mass in kg of the weights required?
2. A gas is confined in a 0.47 m diameter cylinder by a piston, on which rests a weight.
The mass of the piston and weight together is 150 kg. The local acceleration of gravity
is 9.813 m's-2, and atmospheric pressure is 101.57 kPa.
(a) What is the force in newtons exerted on the gas by the atmosphere, the piston,
and the weight, assuming no friction between the piston and cylinder?
(b) What is the pressure of the gas in kPa?
(c) If the gas in the cylinder is heated, it expands, pushing the piston and weight
upward. If the piston and weight are raised 0.83 m, what is the work done by the
gas in kJ? What is the change in potential energy of the piston and weight?
3. Steam at 1400 kPa and 350°C [state 1] enters a turbine through a pipe that is 8 cm in
diameter, at a mass flow rate of 0.1 kg: s-1. The exhaust from the turbine is carried
through a 25-cm-diameter pipe and is at 50 kPa and 100°C [state 2]. What is the power
output of the turbine?
4. One mole of gas in a closed system undergoes a four-step thermodynamic cycle. Use
the data given in the following table to determine numerical values for the missing
quantities indicated by question marks.
Step
-200
?
-6000
?
-3800
?
?
-800
300
4700
?
?
?
-1400
5. A gas in a piston-cylinder assembly undergoes an expansion process from an initial
pressure of 3 bar and initial volume of to a final volume of . During the expansion
process the relationship between pressure and volume is given by . Determine the
workdone if
6. One mole of a monoatomic ideal gas, in the initial state is subjected to the following
three processes, each of which is conducted reversibly:
A doubling of its volume at constant pressure,
Then a doubling of its pressure at constant volume
Then a return to the initial state along the path . Note: V is in liters
i.
ii.
iii.
Calculate the heat (Q) and work (W) effects which occur during each of the three
processes. Note:
Also
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