JETS 81-100

Question 1

What type of jet is used in cooling systems for gas
turbines?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Coolant jet

Answer 1

d) Coolant jet

Question 2

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

Answer 2

a) Thrust-to-weight ratio

Question 3

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

Answer 3

b) To increase velocity

Question 4

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

Answer 4

b) By the forward motion of the engine

Question 5

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

Answer 5

b) Entrainment ratio

Question 6

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

Answer 6

c) It accelerates the flow of the jet

Question 7

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

Answer 7

b) Limited speed

Question 8

Which of the following is NOT a type of jet engine
cycle?
a) Brayton cycle
b) Otto cycle
c) Rankine cycle
d) Stirling cycle

Answer 8

b) Otto cycle

Question 9

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

Answer 9

a) Oscillating air pressure

Question 10

What is the primary purpose of a jet ski’s propulsion
system?
a) To provide lift
b) To steer the craft
c) To propel the craft forward
d) To stabilize the craft

Answer 10

c) To propel the craft forward

Question 11

Which of the following is NOT a component of a
turbofan engine?
a) Fan
b) Turbine
c) Compressor
d) Afterburner

Answer 11

d) Afterburner

Question 12

What is the term for the area of reduced pressure
created by a jet?
a) Vacuum
b) Venturi effect
c) Cavitation
d) Vortex

Answer 12

b) Venturi effect

Question 13

Which factor does NOT affect the efficiency of a jet
engine?
a) Air temperature
b) Engine weight
c) Altitude
d) Fuel type

Answer 13

b) Engine weight

Question 14

In a rocket engine, what propels the exhaust jet?
a) Combustion of fuel
b) Expansion of compressed air
c) Electromagnetic force
d) Nuclear fission

Answer 14

a) Combustion of fuel

Question 15

What type of jet is commonly used in hydraulic
systems?
a) Subsonic jet
b) Supersonic jet
c) Laminar jet
d) Incompressible jet

Answer 15

d) Incompressible jet

Question 16

What is the term for the area where a jet mixes with
the surrounding fluid?
a) Convergence zone
b) Entrainment zone
c) Diffusion zone
d) Transition zone

Answer 16

b) Entrainment zone

Question 17

What is the primary function of the afterburner in a
jet engine?
a) To increase fuel efficiency
b) To provide additional thrust
c) To reduce noise levels
d) To cool the engine

Answer 17

b) To provide additional thrust

Question 18

Which type of jet propulsion system is typically used
in modern commercial aircraft?
a) Turbojet
b) Ramjet
c) Turbofan
d) Pulsejet

Answer 18

c) Turbofan