Exam 3 Questions

Question 1

In the inlet of a turbofan engine, the air ___________ and the pressure ____________

Answer 1

Slows / Increases

Question 2

Exhaust gases turn a “free turbine” and power is measured by torque instead of thrust

Answer 2

Turboprop

Question 3

Powers a gearbox or other device instead of producing thrust

Answer 3

Turboshaft

Question 4

Has an inlet fan that begins the low pressure compression and may process bypass air

Answer 4

Turbofan

Question 5

Produces the most thrust and noise than other aircraft turbine engines

Answer 5

Turbojet

Question 6

The amount of force or thrust generated depends on the _________ of air moved through the engine and the extent of its ___________.

Answer 6

mass; acceleration

Question 7

The force of the exhaust gases developed is a function of ____________.

Answer 7

Newton’s second law

Question 8

The simplest of jet engines is the __________.

Answer 8

Ram Jet

Question 9

Order the sections of a typical turbine engine in order from front to back.

Answer 9

Inlet N1
Compressor N2
Combustion
Turbine
Jet Nozzle

Question 10

In a high-bypass Turbofan engine, as much as ____% of inlet air never goes through the engine core.

Answer 10

85%

Question 11

What powers the N1 fan section?

Answer 11

First set of turbines in the turbine section of the engine.

Question 12

The force of gravity on earth is _______.

Answer 12

32.2 ft./s2

Question 13

The fan diameter of a turbofan is much _______ than a propeller but there are _________ blades and it has a higher ____________.

Answer 13

Smaller/More/Speed

Question 14

The N1 and N2 sections are connected and spin at the same speed. T or F?

Answer 14

False

Question 15

The basic cause of a compressor stall is _______?

Answer 15

Separation of air flow from the compressor blades

Question 16

The Wa a turbine engine can process is most directly affected by _________.

Answer 16

Density

Question 17

Thrust of a turbine engine decreases with altitude. T or F?

Answer 17

True

Question 18

A turbine engine must be designed to operate in a wide range of ________ and ____________.

Answer 18

Temperatures; speeds

Question 19

The relationship with fuel flow and altitude is?

Answer 19

It goes down as altitude goes up

Question 20

What happens to airflow in the inlet of a turbine engine?

Answer 20

Velocity decreases and pressure increases

Question 21

The result of Ram Effect is __________?

Answer 21

Wa is effectively increased

Question 22

At low engine RPM’s thrust increases are _______ even with large increases in throttle/RPM’s

Answer 22

Small

Question 23

T=Q(V2-V1) is an expression of what law of physics relative to thrust produced in turbine engines

Answer 23

Newton’s 2nd law

Question 24

An auxiliary power unit “APU” is what type of turbine engine (hint: it doesn’t produce thrust - it drives something else)

Answer 24

Turboshaft

Question 25

The airflow through the compressor section of a turbine engine is typically either ____________ flow or __________ flow

Answer 25

centrifugal; axial

Question 26

The pressure of the airflow at the burner section has ________ pressure and _________ velocity than at the exit of the compressor section

Answer 26

Less/Greater

Question 27

In about 100 B.C. in Egypt the ________ was developed

Answer 27

Aeolipile

Question 28

The developer of the Stamping Mill was

Answer 28

Giovani Branca

Question 29

A big invention in 1687 by Isaac Newton was the __________.

Answer 29

Steam Wagon (Horseless Carriage)

Question 30

The first patented turbojet engine was in ___________.

Answer 30

1930

Question 31

Frank Whittle took his turbine ideas from the work of ___________.

Answer 31

Sanford Moss