TaAP - Brayton and Engines

The efficiency of the Brayton cycle is always _ the efficiency of the Carnot cycle.

• equal to

• greater than

• double

• less than

Which process is represented by 1-2 in the Brayton cycle diagram?

• isobaric compression

• isothermal compression

• isentropic compression

• isochoric compression

Which processes shown in the Brayton cycle diagram are isobaric?

• 2-3 and 4-1

• 1-2 and 2-3

• 3-4 and 4-1

• 1-2 and 3-4

A gas turbine engine has a pressure ratio of 26. Assuming the engine cycle can be represented by the air-standard Brayton cycle, what will be the cycle efficiency?

• 26%

• 60.6%

• 0.6%

• 74%

The Brayton cycle diagram shown represents which gas turbine hardware?

• 1-2: combustion, 2-3: compressor, 3-4: exhaust, 4-1: turbine

• 1-2: turbine, 2-3: exhaust, 3-4: compressor, 4-1: combustion

• 1-2: exhaust, 2-3: compressor, 3-4: combustion, 4-1: turbine

• 1-2: compressor, 2-3: combustion, 3-4: turbine, 4-1: exhaust

Turboprops are most efficient in:

• High speed, high altitude operations.

• Low speed, low altitude operations.

Which of the following is most efficient at high speeds?

• Turbo-prop

• Low by-pass turbofan

• High by-pass turbofan

• Pure turbojet

For a thermodynamically ideal turbo-jet, the process that occurs through the outlet nozzle is:

• isentropic compression

• isothermal compression

• isentropic expansion

• isothermal expansion

Which of the following features 'supersonic combustion'?

• High by-pass turbofans

• Scramjets

• Ramjets

• Pure turbojets

For a thermodynamically ideal turbo-jet, the combustion process can be considered:

• adiabatic

• isentropic

• isothermal

• isobaric