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Heat And Thermo
Test Description: Heat engine calculations
Instructions: Answer all questions to get your test result.
1) A heat engine takes heat in at a ________________ temperature, performs work, then gives heat up at a __________ temperature
A
lower, higher
B
higher, lower
C
lower, lower
D
higher, higher
2) A heat engine takes in 251J of energy and loses at a lower temp 106J of energy
A
0.422 or 42.2%
B
0.578 or 57.8%
C
2.37 or 237%
D
-1.37 or -137%
3) An engine loses 789J of energy and receives initially 1350J of energy
A
-0.711 or 71.1%
B
1.71 or 171%
C
0.584 or 58.4%
D
0.416 or 41.6%
4) An engine gains 1260J of energy and loses 947J of energy
A
0.456 or 45.6%
B
0.248 or 24.8%
C
1.33 or 133%
D
0.574 or 57.4%
5) 347J of heat is added at a high temperature and 245J is lost at a low temperature
A
29.4%
B
141%
C
-41.6%
D
70.6%
6) 789J of energy is lost at a lower temperature and 899J of energy is added at a high temperature
A
0.122 or 12.2%
B
1.13 or 113%
C
0.877 or 87.7%
D
0.139 or 13.9%
7) Which law of thermodynamics specifically mentions heat engines?
A
2nd law of thermodynamics
B
none of these choices
C
3rd law of thermodynamics
D
1st law of thermodynamics
8) Qc in the heat efficiency equation stands for
A
Energy removed/lost at heat
B
The power generated by the engine
C
Energy added/received as heat
D
The work done in a period of time by the engine
9) Qh in the heat efficiency equation stands for
A
Energy added as heat/received as heat
B
Energy lost/removed as heat
C
the 2nd law of thermodynamics
D
The power done by the engine
10) Is it possible for an engine to be 100% efficient?
A
yes
B
no
C
ummmmm
D
maybe so
*select an answer for all questions
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