In the absence of any irreversibilities, a thermoelectric generator will have the efficiency of a/an __________.
ACarnot cycle
BOtto cycle
CDiesel cycle
DRankine cycle
ESAS · Question Bank
Thermodynamics
274 of 308 questions match · page 2 of 14. Answer in your head first, then check the solution.
Which of the following best describe both Stirling and Ericson engines?
AInternal combustion engines
BExternal combustion engines
CCarnot engines
DA vacuum
Nozzles do not involve any work interaction. The fluid through this device experiences which of the following?
ANo change in potential energy
BNo change in kinetic energy
CNo change in enthalpy
DA vacuum
The convergent section of a nozzle increases the velocity of the flow of the gas. What happens to its pressure?
APressure becomes constant
BPressure equals the velocity
CIt increases the pressure
DIt decreases the pressure
At steam point, the temperatures of water and its vapor at standard pressure are:
Aextremes or maximum
Bunity
Cin equilibrium
Dundefined
In a two-phase system, 30% moisture means:
A70% liquid and 30% vapor
B70% vapor and 30% liquid
C30% liquid and 100% vapor
D30% vapor and 100% liquid
The thermal efficiency of a gas-vapor cycle is ________ the thermal efficiency of a steam turbine or gas turbine.
Agreater than
Bless than
Cnot comparable
Dequal
What is the temperature when water and vapor are in equilibrium with the atmospheric pressure?
AIce point
BSteam point
CCritical point
DFreezing point
When the expansion or compression of gas takes place without transfer of heat to or from the gas, the process is called:
AReversible
BAdiabatic
CPolytropic
DIsothermal
What refers to a liquid whose temperature is lower than the saturation temperature corresponding to the existing pressure?
ASubcooled liquid
BSaturated liquid
CPure liquid
DCompressed liquid
Which of the following occurs in a reversible polytropic process?
AEnthalpy remains constant
BInternal energy does not change
CSome heat transfer occurs
DEntropy remains constant
The change a system undergoes from one equilibrium state to another is known as:
APath
BProcess
CEnthalpy change
DEntropy change
What refers to the series of states through which a system passes during a process?
APath
BQuasi-static steps
CReversibility moves
DIrreversibility moves
What system has neither mass nor energy crossing its boundaries and is not influenced by surroundings?
AClosed system
BOpen system
CIsolated system
DAll of these
Ericson cycle has:
ATwo isothermal and two constant pressure processes
BTwo isothermal and two constant volume processes
CTwo isothermal and two constant entropy processes
DTwo adiabatic, one constant volume and one constant pressure processes
A Stirling cycle has:
ATwo adiabatic and two constant volume processes
BTwo adiabatic and two constant pressure processes
CTwo isothermal and two constant pressure processes
DTwo isothermal and two constant volume processes
What is referred to by a control volume?
AAn isolated system
BA closed system
CA fixed region in space
DA reversible process only
Which of the following is used in a thermal power plant?
ABrayton cycle
BReversed Carnot cycle
CRankine cycle
DOtto cycle
The elongation and compression of a helical spring is an example of which process?
AIrreversible process
BReversible process
CIsothermal process
DAdiabatic process
A Bell-Coleman cycle is the reverse of which cycle?
AStirling cycle
BJoule cycle
CCarnot cycle
DOtto cycle