1. An ideal heat engine can have an efficiency of 1 if the temperature of the lo
ID: 1731923 • Letter: 1
Question
1. An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a.
0 K.
b.
0?C.
c.
0?F.
2. The work done in the expansion from an initial to a final state
a.
is the negative of the area under the curve of a PVdiagram.
b.
depends only on the end point.
c.
is independent of the path.
3. In an adiabatic free expansion
a.
no heat is transferred between a system and its surroundings.
b.
the pressure remains constant.
c.
the temperature remains constant.
4. In an isothermal process
a.
the volume remains constant.
b.
the temperature remains constant.
c.
no heat is transferred between a system and its surroundings.
5. In which process will the internal energy of the system NOTchange?
a.
An adiabatic expansion of an ideal gas.
b.
An isothermal compression of an ideal gas.
c.
An isobaric expansion of an ideal gas.
a.
0 K.
b.
0?C.
c.
0?F.
Explanation / Answer
1) a) 0 k
( as efficiancy is given by (T1-T2)/T1
T2 = 0 gives efficieancy =1
2) a) is the negative of the area under the curve of a PVdiagram.
3) a) no heat is transfered between system and sorroundings
4) b) temperature remains constant
5) b) isothermal expansion of ideal gas
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