96. SEMANAS 2018

Straight mineral oil

Ashless dispersant oil

Synthetic oil

All of them are correct

Wet sump lubrication system stores the oil in a reservoir inside the engine.

Dry sump lubrication system pumps the oil from the engine ́s crankcase to an external tank that stores oil.

A and B are true

A and B are false

Oil absorbs heat from the engine components and dissipates to the atmosphere through a heat exchanger

Sealing is one of the functions of engine oil

Engine oil increases friction created between the moving parts of the engine

All of them

Wide ratio of uses

Wide ratio of temperatures

It is specially designed for airplanes

It is specially prepared for winter

It must work properly in every altitude or atmospheric conditions

It doesn’t need an element to cool the lubricant

Oil leakages are not important

None of them are true

Pressure pump

Crankcase

Filters

Oil tank

Affects the behavior of the combustion with the possibility of detonations

Shortens the life of the engine

Impairs lubrication

All of them are true

They control the airflow

They increase the performances of the engine

They increase drag

None of them are disadvantages

A. For a fixed blade angle, variations in TAS (or RPM) implies variation of the angle of attack

B. For a fixed blade angle, variations in TAS (or RPM) do not implies variation of the angle of attack

C. The propeller can be optimized for several flight conditions

D. AandCaretrue

Pilot uses fine pitch during cruise

Pilot uses coarse pitch in take off

Pilot uses fine pitch during takeoff because more power is needed

All are false

A. The pitch setting must be modified by the pilot during the flight to maintain a determined constant rotational speed

B. The pitch setting varies automatically during the flight to maintain a determined constant rotational speed

C. The pilot actuates directly in the governor to control the blade angle variation

D. A and C are true

Piston engines

Turboprop

Both of them

None of them

It is an overspeed condition, so flyweights tilt outwards and raise pilot valve which introduces oil to increase propeller pitch and lower engine RPM

It is an underspeed condition, so flyweights tilt outwards and raise pilot valve which introduces oil to increase propeller pitch and lower engine RPM

It is an underspeed condition, so flyweights tilt inwards and pilot valve is forced down which decreases oil flow to decrease propeller pitch and increase engine RPM

None of them

It is an overspeed condition, so flyweights tilt outwards and raise pilot valve which introduces oil to increase propeller pitch and lower engine RPM

It is an underspeed condition, so flyweights tilt outwards and raise pilot valve which introduces oil to increase propeller pitch and lower engine RPM

It is an underspeed condition, so flyweights tilt inwards and pilot valve is forced down which decreases oil flow to decrease propeller pitch and increase engine RPM

None of them

A. A good propeller de-icing could be resistance heating elements

B. It causes aerodynamic shape lost

C. Due to the propeller's high spin velocity, icing in blades is not common

D. A and B are true

A. Propellers are better propellants than jet engines

B. Propellers are worse propellants than jet engines

C. Propellers are not good a high cruising speed due to excessive velocities in blade's tips

D. A and C are true

Spitfire

Junkers Ju 87

Bell P-59

Heinkel He-178

It was the first jet-powered aircraft.

It was the first aircraft to break the sound barrier.

It was the first aircraft with sufficient speed to attack the German V1 flying bomb.

It was the first aircraft that could perform sustained inverted flight.

It had the first axial compressor in a turbojet engine.

It had the biggest change of pressure in one stage up until then.

It was the most produced engine in the WWII.

All the answers are false.

A turboprop produces more impulse than a turbojet.

A low-BPR turbofan has a bigger SFC than a high-BPR turbofan in low speeds.

A turboprop has a bigger SFC than a turbojet in low speeds.

A turboprop has the least SFC at any speed.

Axial compressor is a compressor in which the gas or working fluid principally flows parallel to the axis of rotation

Centrifugal compressor is a compressor in which the gas or working fluid principally flows with a radial component through the compressor.

A and B are correct

None of the above

Large size.

Smaller size.

The division between thrust (E) and airflow (G) is lower

None of the above

E (thrust) / G (airflow)

c (consumption) / E (thrust)

G (airflow) / E (thrust)

G (airflow) / c (consumption)

Secondary flow / Primary flow ; and primary flows through the combustion chamber.

Secondary flow / Primary flow ; and secondary flows through the combustion chamber.

Primary flow / Secondary flow ; and primary flows through the combustion chamber.

Primary flow / Secondary flow ; and secondary flows through the combustion chamber.