Podcast
Questions and Answers
What is replaced by a constant-pressure heat-rejection process in a closed-loop Brayton cycle?
What is replaced by a constant-pressure heat-rejection process in a closed-loop Brayton cycle?
- Compression process
- Combustion process
- Exhaust process (correct)
- Expansion process
Which process in a Brayton cycle involves Isentropic compression?
Which process in a Brayton cycle involves Isentropic compression?
- Isentropic expansion
- Constant-pressure heat addition
- Constant-pressure heat rejection
- Compression in a compressor (correct)
What does the thermal efficiency of an ideal Brayton cycle depend on?
What does the thermal efficiency of an ideal Brayton cycle depend on?
- Amount of working fluid
- Temperature difference
- Pressure ratio and specific heat ratio (correct)
- Pressure difference
When neglecting kinetic and potential energy changes, the energy balance for a steady-flow process can be expressed how?
When neglecting kinetic and potential energy changes, the energy balance for a steady-flow process can be expressed how?
What type of process is the constant-pressure heat addition in a Brayton cycle?
What type of process is the constant-pressure heat addition in a Brayton cycle?
Which part of the Brayton cycle involves a constant-pressure heat-rejection process?
Which part of the Brayton cycle involves a constant-pressure heat-rejection process?
What is the net thrust developed by a turbojet engine when the pressures at the inlet and exit are identical?
What is the net thrust developed by a turbojet engine when the pressures at the inlet and exit are identical?
What is the mass flow rate typically taken as in a turbojet engine?
What is the mass flow rate typically taken as in a turbojet engine?
Why do commercial airplanes save fuel by flying at higher altitudes during long trips?
Why do commercial airplanes save fuel by flying at higher altitudes during long trips?
What is the power developed from the thrust of a turbojet engine called?
What is the power developed from the thrust of a turbojet engine called?
What does the net work developed by a turbojet engine equal to?
What does the net work developed by a turbojet engine equal to?
Why can't we define the efficiency of a turbojet engine in the same way as stationary gas turbine engines?
Why can't we define the efficiency of a turbojet engine in the same way as stationary gas turbine engines?
Which type of engine has greater cooling & lubrication requirements?
Which type of engine has greater cooling & lubrication requirements?
Why is the power produced by the same size engine more in a two-stroke cycle engine?
Why is the power produced by the same size engine more in a two-stroke cycle engine?
Which engine type contains valves and valve mechanisms?
Which engine type contains valves and valve mechanisms?
In which engine type is the part load efficiency better than a four-stroke cycle engine?
In which engine type is the part load efficiency better than a four-stroke cycle engine?
Which engine type is used where efficiency is important, such as in cars, buses, trucks, tractors, etc.?
Which engine type is used where efficiency is important, such as in cars, buses, trucks, tractors, etc.?
Why does a two-stroke cycle engine have greater volumetric efficiency?
Why does a two-stroke cycle engine have greater volumetric efficiency?
What is the major difference between the ideal jet propulsion cycle and the simple ideal Brayton cycle?
What is the major difference between the ideal jet propulsion cycle and the simple ideal Brayton cycle?
What is the significance of the pressure ratios for aircraft gas turbines?
What is the significance of the pressure ratios for aircraft gas turbines?
What assumption is made about the turbine work in an ideal jet propulsion cycle?
What assumption is made about the turbine work in an ideal jet propulsion cycle?
What is the role of a diffuser in an aircraft gas turbine?
What is the role of a diffuser in an aircraft gas turbine?
What determines the thrust developed in a turbojet engine?
What determines the thrust developed in a turbojet engine?
Why does the net work output of a jet propulsion cycle equal zero?
Why does the net work output of a jet propulsion cycle equal zero?
What is propulsive efficiency a measure of?
What is propulsive efficiency a measure of?
What is the desired output in a turbojet engine for propulsive efficiency calculation?
What is the desired output in a turbojet engine for propulsive efficiency calculation?
What type of engine is the most widely used in aircraft propulsion?
What type of engine is the most widely used in aircraft propulsion?
What principle is a turbofan engine based on?
What principle is a turbofan engine based on?
Which cycles are considered totally reversible according to the text?
Which cycles are considered totally reversible according to the text?
Which cycles may involve irreversibilities external to the system?
Which cycles may involve irreversibilities external to the system?
Flashcards are hidden until you start studying
