1. Is a temperature difference necessary to operate a heat engine? State why or why not. 2. Definitions of efficiency vary depending on how energy is being converted. Compare the definitions of efficiency for the human body and heat engines. How does the definition of efficiency in each relate to the type of energy being converted into doing work? 3. Why-other than the fact that the second law of thermodynamics says reversible engines are the most efficient-should heat engines employing reversible processes be more efficient than those employing irreversible processes? Consider that dissipative mechanisms are one cause of irreversibility. 1. (a) What is the efficiency of a cyclical heat engine in which 75.0 kJ of heat transfer occurs to the environment for every 95.0 kJ of heat transfer into the engine? (b) How much work does it produce for 100 k) of heat transfer into the engine? 2. The engine of a large ship does 2.00×10°J of work with an efficiency of 5.00%. (a) How much heat transfer occurs to the environment? (b) How many barrels of fuel are consumed, if each barrel produces 6.00x10°) of heat transfer when burned? 3. (a) How much heat transfer occurs to the environment by an electrical power station that uses 1.25x104) of heat transfer into the engine with an efficiency of 42.0%? (b) What is the ratio of heat transfer to the environment to work output? (c) How much work is done?
1. Is a temperature difference necessary to operate a heat engine? State why or why not. 2. Definitions of efficiency vary depending on how energy is being converted. Compare the definitions of efficiency for the human body and heat engines. How does the definition of efficiency in each relate to the type of energy being converted into doing work? 3. Why-other than the fact that the second law of thermodynamics says reversible engines are the most efficient-should heat engines employing reversible processes be more efficient than those employing irreversible processes? Consider that dissipative mechanisms are one cause of irreversibility. 1. (a) What is the efficiency of a cyclical heat engine in which 75.0 kJ of heat transfer occurs to the environment for every 95.0 kJ of heat transfer into the engine? (b) How much work does it produce for 100 k) of heat transfer into the engine? 2. The engine of a large ship does 2.00×10°J of work with an efficiency of 5.00%. (a) How much heat transfer occurs to the environment? (b) How many barrels of fuel are consumed, if each barrel produces 6.00x10°) of heat transfer when burned? 3. (a) How much heat transfer occurs to the environment by an electrical power station that uses 1.25x104) of heat transfer into the engine with an efficiency of 42.0%? (b) What is the ratio of heat transfer to the environment to work output? (c) How much work is done?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
Transcribed Image Text:1. Is a temperature difference necessary to operate a heat engine? State why or
why not.
2. Definitions of efficiency vary depending on how energy is being converted.
Compare the definitions of efficiency for the human body and heat engines. How
does the definition of efficiency in each relate to the type of energy being converted
into doing work?
3. Why-other than the fact that the second law of thermodynamics says reversible
engines are the most efficient-should heat engines employing reversible processes
be more efficient than those employing irreversible processes? Consider that
dissipative mechanisms are one cause of irreversibility.
1. (a) What is the efficiency of a cyclical heat engine in which 75.0 kJ of heat
transfer occurs to the environment for every 95.0 kJ of heat transfer into the
engine? (b) How much work does it produce for 100 k) of heat transfer into the
engine?
2. The engine of a large ship does 2.00×10°J of work with an efficiency of 5.00%.
(a) How much heat transfer occurs to the environment? (b) How many barrels of
fuel are consumed, if each barrel produces 6.00x10°) of heat transfer when
burned?
3. (a) How much heat transfer occurs to the environment by an electrical power
station that uses 1.25x104) of heat transfer into the engine with an efficiency of
42.0%? (b) What is the ratio of heat transfer to the environment to work output?
(c) How much work is done?
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