Crowdly

An auxiliary gearbox is driven by..

a rotating engine shaft, via an internal gearbox, to an external gearbox

the ram air turbine.

compressed air extracted from the auxilary power unit, routed via the auxilary power unit

compressed air extracted from the high pressure compressor, routed via the engine bleed

system.

A turbofan engine with an inlet air mass flow of 320 kg/s and a HP compressor mass flow of 40 kg/s

has a bypass ratio of…

A pilot performs an exterior walkaround and notices a yellow/brown leak on the engine cowling.

Which of the following this leak is likely to be?

1. Oil pump

2. Oil from IDG (Integrated drive generator)

3. Hydraulic fluid

4. Fuel

1 and 4.

3 and 4.

1 and 3.

1 and 2.

For a piston engine, specific fuel consumption is defined as the..

designed fuel consumption for a given RPM.

maximum fuel consumption of the aircraft.

quantity of fuel required to run the engine for one minute at maximum operating conditions.

mass of fuel required to produce unit power for unit time.

A pilot in the cruise notices abnormal fluctuations in RPM and a drop in EPR, accompanied by a high

IT (Interstage Turbines Temperature) and popping noises coming from engine number one. Which of

these could be the cause ?

Engine fire.

Compressor stall.

Turbine overspeed

FADEC control unit failure

pressure in the inlet of a turbofan engine (1)_. and the specific thrust of the engine (2)_..

An aircraft accelerates to a speed below which air is considered incompressible. The dynamic

(1) decreases; (2) increases.

(1) increases; (2) decreases.

(1) decreases; (2) decreases

(1) increases; (2) increases

An impulse magneto coupling in a piston engine….

retards the spark during engine starting.

reduces magneto speed during engine warm-up.

gives an automatic spark increase during high-speed operation.

advances ignition timing and gives a hotter spark at starting.

Comparing a fuel injection system to a fuel carburettor system for a piston engine, the fuel injection system

has a decreased acceleration response.

has a worsened fuel economy.

increases the chances of cylinders overheating due to uneven fuel distribution.

is less prone to induction-system icing.

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

cylinders?

compression from devices downstream of the carburettor

The difference between ambient pressure and exhaust back pressure

compression from devices upstream of the carburettor.

The difference between ambient pressure and pressure inside the cylinder.