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Serway_CP_poll_ch12

# Serway_CP_poll_ch12 - A 4 mole ideal gas system undergoes...

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A 4 mole ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. How much heat is received by the system? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. -20 J 2. zero 3. +5 J 4. +20 J

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A 5 mole ideal gas system undergoes an adiabatic free expansion, going from an initial volume of 10 liters to a final volume of 20 liters. How much work is done by the system during this adiabatic free expansion? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. -50 J 2. -10 J 3. zero 4. +50 J
A heat engine receives 6000 J of heat from its combustion process and loses 4000 J through the exhaust and friction. What is its efficiency? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 33% 2. 40% 3. 67% 4. 73%

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If a heat engine has an efficiency of 30% and its power output is 600 W, what is the rate of heat input from the combustion phase? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1800 W 2. 2400 W 3. 2000 W 4. 3000 W
A steam turbine operates at a boiler temperature of 450 K and an exhaust temperature of 300 K. What is the maximum theoretical efficiency of this system? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 24 2. 50 3. 33 4. 67

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A 4 mole ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. What is its change in internal energy? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. -20 J 2. -5 J 3. zero 4. +20 J
The maximum theoretical thermodynamic efficiency of a heat engine operating between hot and cold reservoirs is a function of which of the following? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. hot reservoir temperature only 2. cold reservoir temperature only 3. both hot and cold reservoir temperatures 4. none of these choices are valid

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During an isobaric process which one of the following does not change? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. volume 2. temperature 3. internal energy 4. pressure
A 2 mole ideal gas system is maintained at a constant volume of 4 liters; if 100 J of heat is added, what is the work done by the system? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. zero 2. 5.0 J 3. 6.7 J 4. 20 J

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A 2 mole ideal gas system is maintained at a constant volume of 4 liters; if 100 J of heat is added, what is the change in internal energy of the system?
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