ASYS Mod 1-6 Exam #2

Question 1

What is a Mach Number

Answer 1

The Aircrafts Speed divided by the speed of sound

Question 2

What is the Speed of sound in MPH

Answer 2

761mph in a standard atmosphere

Question 3

What is the Critical Mach Number

Answer 3

The speed at which air traveling over the wing reaches the speed of sound

Question 4

What is a shock wave

Answer 4

the place on the aircraft’s surface where airflow transitions from subsonic to supersonic

Question 5

what happens to Air pressure and temperature passing through a shockwave

Answer 5

Air Pressure increases and causes temperature to increase with it

Question 6

what happens to Air Velocity passing through a shock wave

Answer 6

Decreases

Question 7

what is transonic flight

Answer 7

the transition period between sub and super sonic flight. usually located between 0.8 and 1.3 mach

Question 8

what happens to drag during transonic flight

Answer 8

drag increases dramatically until aircraft is in supersonic flight

Question 9

what is shock stall

Answer 9

Stall produced by the shockwave rapidly increasing the boundary layer of a wing

Question 10

what are two wing design characteristics that aid in transonic and super sonic flight

Answer 10

a swept back wing and a thin wing

Question 11

what are three primary flight controls

Answer 11

Ailerons, Elevators and rudder

Question 12

what are the three axis of rotation

Answer 12

Longitudinal, Lateral and Vertical

Question 13

what is a Stabilator

Answer 13

a combination of the elevator and the horizontal stabilizer that uses the whole stabilizer as an elevator

Question 14

what is a trim tab

Answer 14

a Secondary flight control located on each other primary flight control to help the pilot make mid air adjustments

Question 15

what are the three types of trim tabs

Answer 15

Standard, Servo and Anti Servo

Question 16

what does a Servo trim tab do

Answer 16

It works with the pilot to make the adjustment of flight controls easier. most commonly used on elevators during climb

Question 17

what is an Anti Servo Trim Tab

Answer 17

A trim tab that works against the pilots inputs. can be used to create greater stability when flight controls are too easy to move

Question 18

if the trim tab on an elevator was set in the downward position during climb, what effect would it have on the elevator

Answer 18

the trim tab would force the elevator further in the direction of movement, acting as a Servo tab to assist the pilot

Question 19

what are the 4 main lift Augmenting Devices

Answer 19

Flaps, Slats, Slots, Spoilers

Question 20

what is the difference between slats and slots

Answer 20

Slats are similar to a flap. they are located on the leading edge of the wing and unfold during landing to increase drag

Slots are grooves cut into the leading edge of a wing that allow high pressure air to travel up into the low preasure one and are used as a preventative measure against stalls

Question 21

what is the difference between a roll spoiler, an air brake and a ground spoiler

Answer 21

it is three different functions of the same flight control. roll spoilers control roll at high speed, air brakes slow the aircraft during flight and ground spoilers are deployed after landing to bring the aircraft to a stop

Question 22

what are three different types of flaps

Answer 22

Plain, Split and fowler

Question 23

what are the three main phases of flight

Answer 23

Climb, including takeoff
Cruise, Level Flight
Descent, including landing

Question 24

what are the two ways to achieve the best climb performance

Answer 24

best RATE of climb
and
best ANGLE of climb

Question 25

what is the difference between best rate of climb and best angle of climb

Answer 25

best rate of climb - the highest altitude for a given amount of time. shallow angle

best angle of climb - highest altitude for a given horizontal distance. steeper angle

Question 26

what is a boundary Layer

Answer 26

The area around the skin of the aircraft where friction drag causes a reduction in airflow