Piston Engine Systems Part 2

Question 1

The flash point is the -

Answer 1

temperature which liquid will start to release vapours which can be ignited

Question 2

The fire point is the -

Answer 2

temperature at which there is sufficient vapours to maintain a flame

Question 3

Cloud point is -

Answer 3

where the wax held in suspension in the oil begins to solidify and separates into crystals giving the oil a cloudy appearance

Question 4

Pour point is the -

Answer 4

lowest temperature to which oil can be cooled before it resists flow

Question 5

which type of lubrication system:

In this system, oil is carried in a separate oil tank, circulated through the engine and returned to the oil tank. This system is usually used for engine of the radial or in line type

Answer 5

The dry sump

Question 6

Dry sump oil system:

Oil is drawn from the tank, through a suction filter, by means of a ? pressure pump, ? from the accessory ? shaft of the ?

Answer 6

Oil is drawn from the tank, through a suction filter, by means of a gear-type pressure pump, driven from the accessory drive shaft of the engine

Question 7

Dry sump oil system:

Under normal conditions, the flow of oil may result in an unacceptably high oil pressure. To overcome this -

Answer 7

a pressure relief valve is mounted in an oil line between the inlet and outlet of the pump

Question 8

Dry sump oil system:

The by-pass valve provides a bypass passage for unfiltered oil in the event of the -

Answer 8

screen becoming clogged up. Because unfiltered oil is better than no lubrication at all.

Question 9

Dry sump oil pump:

Pressure is registered using a -

Answer 9

bourdon tube

Question 10

Dry sump oil system:

Oil that has circulated through the engine drains back into the crankcase where it is returned to the oil tank by -

Answer 10

the scavenge pump

Question 11

Dry sump oil system:

The viscosity of the oil is greatly affected by temperature, thus oil must -

Answer 11

be cooled before circulation commences

Question 12

Dry sump oil system:

An oil temperature gauge in the cockpit is connected to the temperature sensor at a point just -

Answer 12

after the oil cooler

Question 13

Wet sump oil system:

The two differences that sets apart the dry and wet system

Answer 13

The wet system contains a sump below the crankcase

And the wet system does not contain a scavenge pump.

Question 14

100 LL(low lead) avgas is coloured?

Answer 14

Blue

Question 15

The higher the grade of fuel the more -

Answer 15

compression the fuel can stand without detonation

Question 16

The agent used for anti-knocking?

Answer 16

Tetraethyl

Question 17

which type of mixture:

This is defined as that mixture which enables the engine to develop maximum power. The ratios vary between 1:11.5 and 1:15

Answer 17

Best power mixture

Question 18

which type of mixture:

This mixture is defined as that mixture which will produce the greatest amount of power for the least consumption of fuel. the ratio falls between 1:18 and 1:15.5

Answer 18

Best economy mixture

Question 19

The principle that allows drawing fuel from the carburettor bowl and mixing it with the air flow?

Answer 19

A decrease in pressure in the venturi

Question 20

The size of the jet determines the -

Answer 20

rate of fuel discharge

Question 21

The diffuser or discharge nozzle allows fuel to be -

Answer 21

pre-mixed with air before it is discharged from the end of the nozzle

Question 22

The type of mixture that is controlled by the pilot?

Answer 22

The needle mixture control

Question 23

The type of mixture control that utilises the pressure differential between the float chamber at the diffuser is?

Answer 23

The back suction mixture control

Question 24

When the throttle is opened from idle to full fairly rapidly, a large volume of air is drawn in through the air intake of the carburettor. Because of the slow response of the fuel metering system to supply adequate fuel to maintain the correct mixture, the fuel/air mixture is temporarily leaner, causing weak cut or even engine stoppage. To fix this issue a -

Answer 24

accelerator pump is used

Question 25

When an engine is operated at full throttle it will develop maximum power and produce maximum heat. To assist in dissipating the heat at full throttle settings, and to prevent detonation, the fuel mixture is automatically richened by a device attached to the throttle control call -

Answer 25

a economizer