JETS 41-60

Question 1

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 1

c) To propel the craft forward

Question 2

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

Answer 2

d) Afterburner

Question 3

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

Answer 3

b) Venturi effect

Question 4

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

Answer 4

b) Engine weight

Question 5

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 5

a) Combustion of fuel

Question 6

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

Answer 6

d) Incompressible jet

Question 7

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 7

b) Entrainment zone

Question 8

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 8

b) To provide additional thrust

Question 9

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

Answer 9

c) Turbofan

Question 10

What is the primary purpose of a jet in fluid
machinery?
a) To increase pressure
b) To decrease pressure
c) To mix fluids
d) To provide propulsion

Answer 10

d) To provide propulsion

Question 11

Which of the following is true about a jet in fluid
machinery?
a) It always operates at subsonic speeds
b) It can operate at supersonic speeds
c) It only operates in gases, not liquids
d) It has no effect on the surrounding fluid

Answer 11

b) It can operate at supersonic speeds

Question 12

What is the term for the phenomenon where a jet
entrains surrounding fluid?
a) Jetting
b) Contraction
c) Coanda effect
d) Viscosity

Answer 12

c) Coanda effect

Question 13

What type of jet is typically used in jet engines?
a) Incompressible jet
b) Subsonic jet
c) Supersonic jet
d) Laminar jet

Answer 13

c) Supersonic jet

Question 14

In a jet engine, what is the purpose of the convergentdivergent nozzle?
a) To increase pressure
b) To decrease temperature
c) To accelerate the flow to supersonic speeds
d) To decelerate the flow to subsonic speeds

Answer 14

c) To accelerate the flow to supersonic speeds

Question 15

Which law of fluid dynamics governs the behavior of
jets?
a) Bernoulli’s principle
b) Pascal’s law
c) Newton’s law of viscosity
d) Archimedes’ principle

Answer 15

a) Bernoulli’s principle

Question 16

What is meant by the term “choked flow” in the
context of jets?
a) The flow is completely stopped
b) The flow reaches the speed of sound
c) The flow is turbulent
d) The flow is laminar

Answer 16

b) The flow reaches the speed of sound

Question 17

What is the primary factor determining the velocity
of a jet?
a) Temperature of the fluid
b) Pressure of the fluid
c) Density of the fluid
d) Viscosity of the fluid

Answer 17

c) Density of the fluid

Question 18

Which of the following is NOT a characteristic of a
well-designed jet?
a) High velocity
b) Low turbulence
c) Wide spreading
d) Minimal entrainment

Answer 18

c) Wide spreading

Question 19

In a jet propulsion system, what is the purpose of the
diffuser?
a) To increase pressure
b) To decrease pressure
c) To increase velocity
d) To decrease velocity

Answer 19

a) To increase pressure

Question 20

Which type of jet is used in water jet cutting
machines?
a) Subsonic jet
b) Supersonic jet
c) Laminar jet
d) Incompressible jet

Answer 20

b) Supersonic jet