(U + PV) is a quantity called
AFlow energy
BShaft work
CEntropy
DEnthalpy
ESAS · Question Bank
Thermodynamics
308 questions · page 15 of 16. Answer in your head first, then check the solution.
What refers to a system in which there is flow of mass across its boundaries?
AOpen system
BClosed system
CIsolated system
DSteady flow system
It stat that if two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other.
AFirst law of thermodynamics
BZeroth law of thermodynamics
CThird law of thermodynamics
DSecond law of thermodynamics
The cycle generally used for gas turbines is
ARankine cycle
BCarnot cycle
COtto cycle
DBrayton cycle
Which of the following is the other term used for enthalpy-entropy (h-s) diagram?
AEnthalpy diagram
BMollier diagram
CStream diagram
DEntropy chart
In joule cycle, heat is rejected at constant
AVolume
BPressure
CTemperature
DEntropy
It state that if two bodies are in thermal equilibrium with a third body, they also in thermal equilibrium with each other.
AFirst law of thermodynamics
BZeroth law of thermodynamics
CThird law of thermodynamics
DSecond law of thermodynamics
The term “Thermodynamics” comes from the Greek words “Therme” and “Dynamics” which means
AHeat, power
BHeat, motion
CHeat, transfer
DHeat, energy
The ideal, reversible Carnot cycle involve four basic processes. What type of processes are they?
AAll isothermal
BAll adiabatic
CTwo adiabatic and two isentropic
DTwo isothermal and two isentropic
An inventor claims to extract 100 kJ of energy from 30°C sea water and generate 7 kJ of work while rejecting 93 kJ to a 10°C stratum. The scheme fails because
AThe temperature of the sea water is too low
BIt is as a perpetual-motion machine
CIt violates the first law
DIt violates the second law
In the case of a regenerative gas turbine engine, which of the following is false?
AThe regenerator improves the efficiency of the engine
BThe amount of energy required during combustion is less than that required in a similar gas turbine if the power is constant
CThe exit temperature of the regenerator is higher than the inlet temperature of the compressor
DThere is no heat rejected to the atmosphere in a regenerative gas turbine engine
Which of the following is Charle’s law?
AV = k/P
BP1/T1 = P2/T2
CPV = mRT
DV/T = k
When a vapor condenses to a liquid
AIts internal energy increases
BIts temperature rises
CIts temperature falls
DIt gives off internal energy
What is true about the polytropic exponent, for a perfect gas undergoing an isobaric process?
A\(n \gt 0\)
B\(n \lt 0\)
C\(n \to \infty\)
D\(n = 0\)
What law asserts that energy has quality as well as quantity?
AFirst law of thermodynamics
BSecond law of thermodynamics
CThird law of thermodynamics
DZeroth law of thermodynamics
What law provided an absolute reference point for the determination of entropy?
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
The term “enthalpy” comes from Greek word “enthalpen” which means ____
AWarm
BHot
CHeat
DCold
In refrigerator, the quantity 288,000 BTU / day is called
ATON
BVapor heat
CThroughput
DFreon number
Which of the following is not a control volume?
AInsulated tank
BCar radiator
CCompressor
DTurbine
Which of the following statements about work for a quasiequilibrium process is incorrect?
AThe differential of work is inexact
BWork is the area under a P-T diagram
CWork is a path function
DWork is always zero for a constant-volume process