1.
A heat engine has a thermal effeciency of 0.38. During each cycle, it absorbs 720 J of heat from a high temperature reservoir. How much waste heat does it discard each cycle?
380 J
130 J
510 J
450 J
2.
A heat engine receives 1210 J of heat and exhausts 820 J per cycle of the engine. What net work does the engine perform during the cycle?
2030 J
660 J
390 J
820 J
3.
A heat engine of efficiency 0.52 performs 780 J of useful work per cycle.What is the heat input per cycle?
410 J
330 J
1200 J
1500 J
4.
During each cycle of its operation, an air conditioner transfers 930 kJ of heat from a room and outputs 1730 kJ of heat to the outdoors. What mechanical work is involved per cycle?
2660 kJ of work performed by the air conditioner
800 kJ of work performed by the air conditioner
800 kJ of work performed on the air conditioner
2660 kJ of work performed on the air conditioner
5.
A heat engine has an effeciency of 0.48. Initially, the heat input to the engine is QH. Then the heat input is increased by a factor of 2.4. By what factor does the net work W change?
2.4
0.42
5.8
1
6.
A heat engine takes in 840 kJ per cycle from a heat reservoir. Which is not a possible value of the engine's heat output per cycle?
0 kJ
150 kJ
830 kJ
400 kJ