Applied Thermodynamics Test 3

Gas Carnot Cycle T-s Diagram

Gas Carnot Cycle P-v Diagram

Otto Cycle T-s Diagram

Otto Cycle P-v Diagram

Diesel Cycle T-s Diagram

Diesel Cycle P-v Diagram

Dual Cycle P-v Diagram

Brayton Cycle P-v Diagram

Brayton Cycle T-s Diagram

Brayton Cycle with Regeneration T-s Diagram

Reverse Brayton Cycle T-s Diagram

Reverse Carnot Cycle T-s Diagram

Ideal Vapor-Compression Cycle P-h Diagram

Ideal Vapor-Compression Cycle T-s Diagram

Cascade Refrigeration System T-s Diagram

Actual Vapor-Compression Cycle T-s Diagram

Reverse Brayton Cycle with Regeneration T-s Diagram

Gas Carnot Cycle Diagram

Otto Cycle Diagram

Brayton Cycle with Regeneration Diagram

Reverse Carnot Cycle Diagram

Ideal Vapor-Compression Cycle Diagram

Actual Vapor-Compression Cycle Diagram

Cascade Refrigeration System Diagram

Reverse Brayton Cycle Diagram

Reverse Brayton Cycle with Regeneration Diagram

In Diesel cycle, the heat addition process takes place at __________.

constant volume

What is the first process of the simple ideal Brayton cycle?

Isentropic compression

What is the second process of the simple ideal Brayton cycle?

constant-pressure heat addition

What is the third process of the simple ideal Brayton cycle?

isentropic expansion

What is the fourth process of the simple ideal Brayton cycle?

constant-pressure heat rejection

In a simple ideal Brayton cycle, when the pressure ration increases, the thermal efficiency _____.

increases

The ratio of the compressor/pump work input to the turbine work output.

Back work ratio

In the Brayton cycle, the thermal efficiency _____ due to inefficiencies of the turbine and the compressor.

decreases

In a Brayton cycle, regeneration _____ the thermal efficiency of the system.

increases

What is the equation for the effectiveness of a regenerator used in Brayton cycles?

ε = q_{regen, act} / q_{regen, max}

In an ideal regenerator, the air leaving the compressor is heated to the temperature ________.

at the turbine exit

Heat engines convert thermal energy to _____.

work

On a T-s diagram, a heat-addition process proceeds in the direction of _____ entropy.

increasing

An isentropic process proceeds at a _____ entropy.

constant

In the Otto cycle, the combustion process is initiated by a _________.

spark plug

In the Diesel cycle, the combustion process is initiated by a _________.

fuel injector

Process 2-3 in the Diesel cycle occurs at a constant ______.

pressure.

Process 2-3 in the Otto cycle occurs at a constant ______.

volume

The compression ratio (r) is the ratio of the _____ volume to the ______ volume.

maximum, minimum

Processes 0-1 and 1-0 of the Otto cycle occur at a constant _____.

pressure

In the Otto cycle, as the compression ratio (r) increases, the thermal efficiency of the cycle _____.

increases

In the Otto cycle, as the specific heat (k) increases, the thermal efficiency of the cycle _____.

increases

In the Diesel cycle, as the cutoff ratio (r_c) increases, the thermal efficiency of the cycle _____.

decreases

The Diesel cycle is _____ efficient than the Otto cycle.

more

The Brayton cycle operates on a _____ cycle.

closed

In the Brayton cycle, as the pressure ratio (r_p) increases, the thermal efficiency of the cycle _____.

increases

In the Brayton cycle, as the specific heat (k) increases, the thermal efficiency of the cycle _____.

increases

In the Brayton cycle, regeneration causes the heat input to _____.

decrease

In the Brayton cycle, regeneration causes the net work output to _____.

decrease

In the Brayton cycle, intercooling causes the specific volume of the working fluid to _____ during the compression process.

decrease

In the Brayton cycle, reheating causes the work output of the turbine to ______.

increase

In the Brayton cycle, reheating causes the thermal efficiency to _____.

decrease

In the Brayton cycle, intercooling causes the thermal efficiency to _____.

decrease

The reverse Carnot cycle is impractical because process 2-3 involves the compression of a _____, requiring a compressor that can handle ______.

liquid-vapor mixture, two phases

The reverse Carnot cycle is impractical because process 4-1 involves the expansion of _____ refrigerant in a turbine.

high-moisture-content

In the ideal vapor-compression refrigeration cycle, the _____ is replaced with a ______.

turbine, throttling device.

The irreversibility in the ideal vapor-compression refrigeration cycle is caused by which device?

Throttling device

In the ideal vapor-compression refrigeration cycle, two common sources of irreversibilities are _____ and _____.

fluid friction, heat transfer

The cascade refrigeration system preforms well when _____ temperatures are required.

moderately low

The cascade refrigeration system preforms well when ______ temperature ranges are required.

large

Cascading _____ the COP of a refrigeration system.

increases

Unlike the Carnot cycle, in teh reversed Brayton cycle, heat transfer processes are not ______.

isothermal

Gas refrigeration cycles have _____ COPs than vapor-compression refrigeration cycles.

lower

Brayton Cycle with Intercooling T-s Diagram

Brayton Cycle with Reheating T-s Diagram