Heat And Thermo Question Preview (ID: 40524)


Heat Engine Calculations. TEACHERS: click here for quick copy question ID numbers.

A heat engine takes heat in at a ________________ temperature, performs work, then gives heat up at a __________ temperature
a) higher, lower
b) lower, higher
c) higher, higher
d) lower, lower

A heat engine takes in 251J of energy and loses at a lower temp 106J of energy
a) -1.37 or -137%
b) 0.422 or 42.2%
c) 0.578 or 57.8%
d) 2.37 or 237%

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%

An engine gains 1260J of energy and loses 947J of energy
a) 0.574 or 57.4%
b) 0.248 or 24.8%
c) 0.456 or 45.6%
d) 1.33 or 133%

347J of heat is added at a high temperature and 245J is lost at a low temperature
a) -41.6%
b) 29.4%
c) 141%
d) 70.6%

789J of energy is lost at a lower temperature and 899J of energy is added at a high temperature
a) 0.877 or 87.7%
b) 1.13 or 113%
c) 0.139 or 13.9%
d) 0.122 or 12.2%

Which law of thermodynamics specifically mentions heat engines?
a) 1st law of thermodynamics
b) 2nd law of thermodynamics
c) 3rd law of thermodynamics
d) none of these choices

Qc in the heat efficiency equation stands for
a) Energy added/received as heat
b) The power generated by the engine
c) Energy removed/lost at heat
d) The work done in a period of time by the engine

Qh in the heat efficiency equation stands for
a) Energy added as heat/received as heat
b) the 2nd law of thermodynamics
c) Energy lost/removed as heat
d) The power done by the engine

Is it possible for an engine to be 100% efficient?
a) yes
b) no
c) maybe so
d) ummmmm

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