Supercharging

Question 1

Ideally, the air entering the carburettor/throttle unit should be clean and (warm / cold).

Answer 1

cold

Question 2

Best volumetric efficiency is provided by using the (forward-facing / carburettor hot air) intake.

Answer 2

forward-facing

Question 3

In most carburettor heat systems, warm air is drawn initially from the ______ compartment, and further heated by being passed through a muff or heat exchanger around the ______ mainfold, before being ducted to the carburettor.

Answer 3

engine; exhaust

Question 4

When carburettor heat is selected, there is a (drop / rise) in manifold pressure because there is a (gain / loss) in ram air pressure; there is (greater / less) restriction on the air flow; and the heated air is (less / more) dense than previously.

Answer 4

drop; loss; greater; less

Question 5

If it is suspected that exhaust fumes are entering the cockpit, ventilation with fresh air should be immediately (increased / decreased) and the incident reported after ______.

Answer 5

increased; landing

Question 6

Because of lower air density, a normally-aspirated engine will have lost approximately ______% of its sea level power by the time it has reached ______ft.

Answer 6

25%; 10,000ft

Question 7

The principle of supercharging is to ______ the density of the fuel-air charge, before it enters the cylinders. In this way, sea-level power (can / can not) be maintained to a higher altitude, and sea-level power output can be (increased / decreased).

Answer 7

increase; can; increased

Question 8

The limit to the amount of supercharging which can be applied is the ______ rise caused by compressing the mixture and the liability to cause ______.

Answer 8

temperature; detonation

Question 9

A geared supercharger is driven (mechanically by the engine / by an exhaust-gas turbine). A single-stage supercharger has (one impeller / two impellers)

Answer 9

mechanically by the engine; one impeller

Question 10

In a turbocharger system, the speed of the turbine (and therefore of the impeller and the amount of supercharging) is controlled by the positioning of a ______ gate.

Answer 10

waste

Question 11

In a fixed wase gate system, the proportion of exhaust gas going through the turbine is (set on the ground / under control of the pilot). With this type of system, care must be taken not to (over / under) boost the engine - which can lead to ______.

Answer 11

set on the ground; over; detonation

Question 12

In an automatic variable waste gate system, the pilot sets the required manifold pressure with the ______ and, through the use of an ______ capsule or other sensor, the positioning of the ______ ______ is automatically varied to obtain the required amount of turbocharging.

Answer 12

throttle; aneroid, waste gate