JETS 21-40 Flashcards
In a turbofan engine, what is the purpose of the fan?
a) To compress air
b) To cool the engine
c) To increase thrust
d) To provide propulsion
c) To increase thrust
Which of the following is a disadvantage of using a
supersonic jet for propulsion?
a) High fuel consumption
b) Limited top speed
c) Poor maneuverability
d) Excessive noise levels
d) Excessive noise levels
What type of jet is commonly used in inkjet printers?
a) Subsonic jet
b) Supersonic jet
c) Laminar jet
d) Incompressible jet
a) Subsonic jet
What is the primary advantage of using a laminar jet?
a) High thrust
b) Low noise levels
c) Narrow spreading
d) Minimal entrainment
d) Minimal entrainment
Which component of a jet engine is responsible for
igniting the fuel-air mixture?
a) Compressor
b) Nozzle
c) Turbine
d) Combustor
d) Combustor
What is the primary purpose of a jet pump?
a) To increase pressure
b) To decrease pressure
c) To mix fluids
d) To provide propulsion
a) To increase pressure
What type of jet is used in rocket propulsion?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Exhaust jet
b) Supersonic jet
Which factor does NOT affect the efficiency of a jet
engine?
a) Temperature of the surroundings
b) Altitude
c) Humidity
d) Diameter of the nozzle
d) Diameter of the nozzle
What is the term for the ratio of the actual velocity of
a jet to the velocity of sound?
a) Mach number
b) Reynolds number
c) Froude number
d) Weber number
a) Mach number
What type of jet is commonly used in sandblasting
applications?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Abrasive jet
d) Abrasive jet
What phenomenon allows a jet engine to produce
thrust?
a) Newton’s Third Law of Motion
b) Archimedes’ Principle
c) Pascal’s Law
d) Boyle’s Law
a) Newton’s Third Law of Motion
What type of jet is used in cooling systems for gas
turbines?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Coolant jet
d) Coolant jet
Which factor affects the range of a jet-powered
aircraft?
a) Thrust-to-weight ratio
b) Wing span
c) Length of the fuselage
d) Density of the fuel
a) Thrust-to-weight ratio
What is the primary purpose of a jet nozzle?
a) To decrease pressure
b) To increase velocity
c) To mix fluids
d) To provide stability
b) To increase velocity
In a ramjet engine, how is the incoming air
compressed?
a) By a compressor
b) By the forward motion of the engine
c) By a diffuser
d) By a convergent-divergent nozzle
b) By the forward motion of the engine
What is the term for the ratio of the mass flow rate of
the jet to the mass flow rate of the surrounding fluid?
a) Jet ratio
b) Entrainment ratio
c) Thrust ratio
d) Efficiency ratio
b) Entrainment ratio
What is the primary disadvantage of using a water jet
for propulsion in marine applications?
a) High energy consumption
b) Limited speed
c) Environmental impact
d) Corrosion of the nozzle
b) Limited speed
Which of the following statements is true about a
convergent nozzle?
a) It decreases the velocity of the jet
b) It increases the pressure of the jet
c) It accelerates the flow of the jet
d) It decreases the mass flow rate of the jet
c) It accelerates the flow of the jet
Which of the following is NOT a type of jet engine
cycle?
a) Brayton cycle
b) Otto cycle
c) Rankine cycle
d) Stirling cycle
b) Otto cycle
In a pulsejet engine, what causes the periodic
combustion process?
a) Oscillating air pressure
b) Turbine rotation
c) Pulsating fuel injection
d) Thermal expansion of the combustion chamber
a) Oscillating air pressure
