JETS 61-80

Question 1

What is the primary disadvantage of using a subsonic
jet for propulsion?
a) High fuel consumption
b) Low thrust
c) High noise levels
d) Limited range

Answer 1

b) Low thrust

Question 2

Which principle explains why a jet of water can bend
around a corner?
a) Bernoulli’s principle
b) Coanda effect
c) Pascal’s law
d) Archimedes’ principle

Answer 2

b) Coanda effect

Question 3

Which factor does NOT affect the trajectory of a jet?
a) Density of the jet
b) Angle of the jet
c) Velocity of the jet
d) Viscosity of the jet

Answer 3

d) Viscosity of the jet

Question 4

What is the main advantage of using a jet over a
propeller for propulsion?
a) Higher efficiency
b) Lower noise levels
c) Greater maneuverability
d) Longer service life

Answer 4

c) Greater maneuverability

Question 5

Which component of a jet engine is responsible for
compressing incoming air?
a) Turbine
b) Compressor
c) Nozzle
d) Combustor

Answer 5

b) Compressor

Question 6

What type of jet is commonly used in fire fighting
applications?
a) Supersonic jet
b) Subsonic jet
c) Incompressible jet
d) Laminar jet

Answer 6

a) Supersonic jet

Question 7

What is the term for the phenomenon where a jet
spreads out upon exiting a nozzle?
a) Contraction
b) Diffusion
c) Dilation
d) Dispersion

Answer 7

c) Dilation

Question 8

Which factor does NOT affect the thrust produced by
a jet engine?
a) Mass flow rate
b) Velocity of the jet
c) Pressure of the jet
d) Density of the jet

Answer 8

c) Pressure of the jet

Question 9

Which of the following is NOT a type of jet engine?
a) Turbojet
b) Ramjet
c) Pulsejet
d) Pistonjet

Answer 9

d) Pistonjet

Question 10

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

Answer 10

c) To increase thrust

Question 11

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

Answer 11

d) Excessive noise levels

Question 12

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

Answer 12

a) Subsonic jet

Question 13

What is the primary advantage of using a laminar jet?
a) High thrust
b) Low noise levels
c) Narrow spreading
d) Minimal entrainment

Answer 13

d) Minimal entrainment

Question 14

Which component of a jet engine is responsible for
igniting the fuel-air mixture?
a) Compressor
b) Nozzle
c) Turbine
d) Combustor

Answer 14

d) Combustor

Question 15

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

Answer 15

a) To increase pressure

Question 16

What type of jet is used in rocket propulsion?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Exhaust jet

Answer 16

b) Supersonic jet

Question 17

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

Answer 17

d) Diameter of the nozzle

Question 18

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

Answer 18

a) Mach number

Question 19

What type of jet is commonly used in sandblasting
applications?
a) Subsonic jet
b) Supersonic jet
c) Incompressible jet
d) Abrasive jet

Answer 19

d) Abrasive jet

Question 20

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

Answer 20

a) Newton’s Third Law of Motion