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An engine is found to have an efficiency of 0.40. If it does 200 J of work per β¦
Related Topics
Wize University Physics Textbook (Master) > Thermodynamics
Heat Engines
3 Activities
An engine is found to have an efficiency of 0.40. If it does 200 J of work per cycle, what are the corresponding quantities of heat absorbed and rejected?
Answer
β
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More Heat Engines Questions:
A Carnot engine has an efficiency of 33.0% It operates between constant reservoirs differing in temperature by 95
o
C.
What are the temperatures of the two reservoirs?
Entropy: Heat Engines
A cylinder contains Nitrogen gas (πΆ
v
= 20.8
J
m
o
l
.
K
\frac{J}{mol.K}
m
o
l
.
K
J
β
, πΎ = 1.4) at a pressure of 3 atm and a temperature of 250K. Its initial volume is 2.0 liters. The Nitrogen gas is next carried through the following processes:
a. It is heated in an isochoric process to a temperature of 375K
b. It is expanded at a constant temperature to a volume of 3.0 liters
Heat Engines: Otto Cycle
Otto Cycle is made of two isochoric processes at π
0
and ππ
0
for π > 1 and two adiabatic processes which compress and extend the gas between these two volumes.
Plot PV curve of this cycle and find its efficiency in terms of only compression ratio, π and πΎ.
In a Stirling heat engine, a monatomic ideal gas at initial volume V
1
and temperature T
1
, takes in heat at a constant volume until its temperature is T
2
, and then expands isothermally until its volume is V
2
. It gives out heat at a constant volume until its temperature is again T
1
and then returns to its initial state by isothermal contraction. Calculate the efficiency and compare with a Carnot engine operating between the same two temperatures.
Thermodynamics: Heat Engines
A diatomic gas undergoes some thermodynamical processes according to the following plot. Imagine the process from a to b could be changed in order to get different efficiency for the following cycle under the condition that the temperature of the gas cannot exceed the temperature at point a during the entire cycle. What is the work done by the gas from a to b in a process which makes the efficiency of the heat engine equal to the half of the efficiency of a Carnot engine which works in the same range of temperatures? (Assume we have 2 moles of the gas)
PV Curve: Heat Engines
In a Diesel cycle V
o
volume of gas is expanded in an isobaric process to
πΌπ
o
and then is expanded more to ππ
o
in an adiabatic process. The gas in then cooled down via an isochoric process and then is compressed back to its initial volume. Draw PV curve of this cycle and find the efficiency of this cycle only in terms of πΌ, π ,and πΎ.
Entropy: Heat Engines
A cylinder contains a diatomic gas at a pressure of 3 atm and a temperature of 250K. Its initial volume is 4.0 liters. The gas is next carried through the following processes:
a. It is expanded isobarically to a temperature of 375K.
b. It is cooled down to 250K in an isochoric process.
Which one of the following statements best describes the operation of a heat engine?
For heat engine cycle is
clockwise
while for heat pump cycle is
counterclockwise