1) Multiple Choice 1. The ideal work to operate a particular compressor is 100 KW. An energy audit finds the process is consuming 50 KW. What of the following is most likely to be true? a) the lost work is 50 KW b) the compressor efficiency is 50% c) the energy audit power measuring equipment is not working correctly d) the compressor will produce more work if the moving parts are serviced 2. In a turbine, shaft friction is increased, which of the following will increase? a) ideal work b) lost work c) turbine efficiency d) none of the above will increase 3. Entropy generation can occur by all of the following except: a) heat flow between system and surrounding b) internal irreversibilities c) matter generation d) both a and c 4. Which of the following is true of a reversible process? a) It must involve an ideal gas. b) Entropy generation must be zero c) Entropy generation must be positive or zero d) None of the above must be true 5. Which allows one to compute coefficient of performance for a vapor- compression cycle? a) Compressor ideal work and heat exchange in the condenser b) Compressor shaft work and heat exchange in the condenser c) Compressor shaft work and heat exchange in the evaporator d) Compressor ideal work and temperature change in the throttle
1) Multiple Choice 1. The ideal work to operate a particular compressor is 100 KW. An energy audit finds the process is consuming 50 KW. What of the following is most likely to be true? a) the lost work is 50 KW b) the compressor efficiency is 50% c) the energy audit power measuring equipment is not working correctly d) the compressor will produce more work if the moving parts are serviced 2. In a turbine, shaft friction is increased, which of the following will increase? a) ideal work b) lost work c) turbine efficiency d) none of the above will increase 3. Entropy generation can occur by all of the following except: a) heat flow between system and surrounding b) internal irreversibilities c) matter generation d) both a and c 4. Which of the following is true of a reversible process? a) It must involve an ideal gas. b) Entropy generation must be zero c) Entropy generation must be positive or zero d) None of the above must be true 5. Which allows one to compute coefficient of performance for a vapor- compression cycle? a) Compressor ideal work and heat exchange in the condenser b) Compressor shaft work and heat exchange in the condenser c) Compressor shaft work and heat exchange in the evaporator d) Compressor ideal work and temperature change in the throttle
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:1) Multiple Choice
1. The ideal work to operate a particular compressor is 100 KW. An energy audit
finds the process is consuming 50 KW. What of the following is most likely to be true?
a) the lost work is 50 KW
b) the compressor efficiency is 50%
c) the energy audit power measuring equipment is not working correctly
d) the compressor will produce more work if the moving parts are serviced
2. In a turbine, shaft friction is increased, which of the following will increase?
a) ideal work
b) lost work
c) turbine efficiency
d) none of the above will increase
3. Entropy generation can occur by all of the following except:
a) heat flow between system and surrounding
b) internal irreversibilities
c) matter generation
d) both a and c
4. Which of the following is true of a reversible process?
a) It must involve an ideal gas.
b) Entropy generation must be zero
c) Entropy generation must be positive or zero
d) None of the above must be true
5. Which allows one to compute coefficient of performance for a vapor-
compression cycle?
a) Compressor ideal work and heat exchange in the condenser
b) Compressor shaft work and heat exchange in the condenser
c) Compressor shaft work and heat exchange in the evaporator
d) Compressor ideal work and temperature change in the throttle
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