Mixture, Aeroplane: Propellers, Performance & Engine Handling

Question 1

For a piston engine, the chemically correct fuel/air ratio is?

Answer 1

1:15

Question 2

In a 4-stroke normal aspirated piston engine at altitude, which of the following causes the air-fuel mixture to enter the cylinders?

Answer 2

The difference between ambient pressure and pressure inside the cylinder

Question 3

In a piston engine, turbocharger boost pressure can be monitored by?

Answer 3

A manifold pressure gauge only.

Question 4

Fixed-pitch propellers are usually designed for maximum efficiency at?

Answer 4

Cruising speed.

Question 5

The main advantage of a constant speed propeller compared to a fixed pitch propeller is that a constant speed propeller?

Answer 5

Maintains its maximum propeller efficiency over a wider range of airspeeds.

Question 6

How can FADEC systems on piston engines usually achieve a level of redundancy?

Answer 6

Each engine is fitted with two FADEC computers.

Question 7

What should the air/fuel ratio be during a take-off at sea level in a piston engine?

Answer 7

10:1

Question 8

For piston engines, mixture ratio is the ratio between the?

Answer 8

mass of fuel and mass of air entering the cylinder.

Question 9

What is a normally aspirated engine?

Answer 9

An engine without a supercharger or turbocharger

Question 10

The maximum horsepower output which can be obtained from an engine when it is operated at specified RPM and manifold pressure conditions established as safe for continuous operation is named?

Answer 10

Rated Power.

Question 11

An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to?

Answer 11

Assist the pilot to set the correct mixture.

Question 12

After start of a piston engine, correct operation of the pitch adjustment system of a constant speed propeller can be confirmed by altering the propeller control lever and checking indications on the?

Answer 12

Tachometer.

Question 13

When an engine is stopped in flight and the propeller blade angle is near 90°, The propeller is said to be?

Answer 13

Feathered

Question 14

On an aeroplane with a piston engine and a fixed pitch propeller the power output is monitored on the?

Answer 14

RPM Indicator.

Question 15

What moves the propeller blade towards fine pitch?

Answer 15

Centrifugal force.

Question 16

In a piston engine if the ratio of air to fuel is approximately 9:1 the mixture is?

Answer 16

Rich.

Question 17

The kind of compressor normally used in a piston engine as a turbocharger is?

Answer 17

A centrifugal compressor.

Question 18

Assuming the RPM and throttle levers are not altered, when TAS increases the blade angle of a constant speed propeller will?

Answer 18

Increase

Question 19

The “slipstream effect” of a propeller is most prominent at?

Answer 19

Low airspeeds with high power setting.

Question 20

How will high humidity effect Turbine and Piston engines?

Answer 20

They will both have decreased performance

Question 21

An intercooler fitted between a supercharger and the inlet manifold will?

Answer 21

Minimise the risk of detonation.

Question 22

If the manifold pressure is increased, the blade angle of a constant speed propeller will?

Answer 22

Increase

Question 23

The blade angle of a propeller is the angle between the?

Answer 23

Reference chord line and the propeller plane of rotation.

Question 24

A turbocharger system in a reciprocating engine is normally driven by?

Answer 24

The exhaust system.

Question 25

The mechanism to change the propeller blade angle of a small piston engine aeroplane in flight is operated hydraulically by?

Answer 25

Engine oil