Engines

Question 0

What are the four strokes of a 4-stroke engine called?

Answer 0

Induction, compression, combustion and exhaust

Question 1

The crankshaft is connected to the

Answer 1

Propeller

Question 2

The pressure in the inlet valve is controlled by the

Answer 2

Throttle

Question 3

The force acting in the cylinder depends on the temperature reached during which phase?

Answer 3

Combustion

Question 4

The carburetor mixes fuel int air according to the speed of what?

Answer 4

Airflow

Question 5

What is a typical avgas fuel:air ratio?

Answer 5

1:14

Question 6

Mixture may be run lean at altitude because higher air is what?

Answer 6

Less dense

Question 7

By using a leaner mix, the aircraft range is (increased or decreased)?

Answer 7

Increased

Question 8

In an ultralight, carby heat should be avoided when taxying because the air is what?

Answer 8

Unfiltered

Question 9

The fuel system’s vent lets what flow into the fuel tank?

Answer 9

Air

Question 10

The fuel drain allows inspection for what?

Answer 10

Fuel contamination

Question 11

Fuel detonation can occur if fuel is too what?

Answer 11

Hot

Question 12

What avgas is dyed blue?

Answer 12

100LL

Question 13

What fuel is dyed red

Answer 13

MOGAS

Question 14

Clear fuel is named what?

Answer 14

AVTUR

Question 15

Avgas 100 is dyed what colour?

Answer 15

Green

Question 16

Black smoke can be a sign of a mixture that is too what?

Answer 16

Rich

Question 17

A high CHT may indicate what sort of mixture?

Answer 17

Lean

Question 18

A gradual loss of power in a fixed pitch propeller aircraft indicates what?

Answer 18

Carburettor ice

Question 19

The throttle controls the pressure in the what valve?

Answer 19

Inlet valve

Question 20

The temperature reached during the combustion phase relates to the force within what?

Answer 20

Cylinder

Question 21

If the mixture is too lean, it will be indicated onwhich instrument?

Answer 21

CHT

Question 22

What is the colour of Mogas?

Answer 22

Red

Question 23

100LL is dyed what colour and what does the LL stand for?

Answer 23

Blue, low lead

Question 24

The cams push against what?

Answer 24

Pushrods

Question 25

What is used to generate the high voltage for the spark plugs?

Answer 25

Magnetos.

Question 26

Why does power reduce when one magneto is off?

Answer 26

Each magneto fires one of two sparkplugs in each cylinder. When a magneto fails, only one of the two plugs fires resulting in less efficient combustion.

Question 27

In a long period of idling, why can power output reduce slightly in a horizontally arranged engine? How is it corrected?

Answer 27

Oil leaks into a cylinder. When it is not running hot enough to burn the oil, it can pool near one of the plugs, gathering across the terminals and preventing a spark. Leaning the mixture and increasing the power will raise the cylinder temperature and burn the oil.

Question 28

Where is electrical power sourced before the engine fires and after it fires?

Answer 28

Battery and alternator

Question 29

What gas is released by a lead acid battery?

Answer 29

Hydrogen

Question 30

How is the system protected from a current surge?

Answer 30

Circuit breakers

Question 31

What happens if the voltage gets too high?

Answer 31

A warning light is illuminated.

Question 32

Why is the engine periodically heated in an extended glide?

Answer 32

To clear carbon buildup from the rich mixture at low power

Question 33

If Carburettor heat were applied at takeoff, what would the effect be on the mixture?

Answer 33

Too rich due to reduced ram effect

Question 34

An exhaust gas temperature gauge responds to what?

Answer 34

Mixture strength