Systems, Power Plant and Electronics - Level 1

The fuel tanks in small aircraft are mainly located:

In the wings.

Resistance is expressed in... and the basic SI units for it are...

Ohms, V/A

To prevent leakage of a mineral based fluid in two directions which seal is used?

a synthetic '0' seal.

Emergency air bottle may be used for:

an emergency power supply in the event of main system fluid pressure loss.

A turbocharger is:

an exhaust driven supercharger

The oil contents on a piston engine are checked:

at any time after the engine has stopped

Auto brakes are disengaged:

by the pilot.

With RTO (rejected take-off) selected and armed, the brakes will be automatically applied if:

reverse thrust is selected at any time.

In a piston engine if the ratio of air to fuel, by weight, is approximately 9:1, the mixture is said to be:

rich

In a piston engine, the camshaft:

rotates at half the speed of the crankshaft

Should the incorrect hydraulic fluid be used in a system:

seal damage will result.

On landing, the cabin pressure is equalized with atmospheric pressure by the operation of:

squat switches which open the dump valves at touch down.

Tyre wear can be reduced while taxiing by:

taxiing at 25 knots or less.

Brake Mean Effective Pressure is:

the average useful working pressure applied to the piston during the working stroke

When the destination field elevation is set on the pressurisation control system:

the barometric controller adjusts cabin pressure to approximately 0.1psi above ambient pressure (at destination).

Adjustment may have to be made to an aircraft fuel system if it has been refuelled with JET B instead of its normal JET A1 fuel. These adjustments are to cater for:

the change in specified gravity of the fuel

A pressurized aeroplane is operated at FL 300. It undergoes a rapid decompression so that the pressure in the cabin goes quickly down to the outside pressure value. What happens concerning the oxygen system?

the oxygen masks are automatically presented to cabin crew members and passengers

On an aircraft equipped with a compensated capacitance type fuel quantity indication system graduated to read in kg, the temperature increases just after the tanks are half filled with fuel. If the fuel expands by 10%, the gauges will show:

the same amount.

The total current flow in an electrical circuit with resistors in parallel is equal to...

the sum of all the currents in all the components in the circuit.

The elements specifically protected against icing on transport aircraft are: 1. engine air intake and pod. 2. front glass shield. 3. radome. 4. pitot tubes and waste water exhaust masts. 5. leading edge of wing. 6. cabin windows. 7. trailing edge of wings. 8. electronic equipment compartment. The combination regrouping all the correct statements is:

1, 2, 4, 5

In a diluter demand system, selection of emergency on this regulator will result in:

100% oxygen continuous flow at positive pressure

In accordance with JAR-OPS 1; 10 % of the passengers in a non-pressurized airplane must have an oxygen supply reserve for the entire flight time when the cabin altitude pressure is greater than:

10000 ft but not exceeding 13000 ft minus 30 minutes

A 311 litre portable oxygen bottle (flow rate of 3 litres/min) will last for:

103 minutes

Which is the most suitable relative humidity for an environmental control system to maintain in an aircraft?

30%.

At what altitude will the diluter-demand oxygen regulator provide 100% pure oxygen?

34 000 ft

If the swept volume of an engine is 1,300 cm' and the total cylinder volume is 1,600 cm' then the compression ratio is:

5.33:1

Some emergency exits must be equipped with devices so as to help the occupants to get out and reach the ground if their threshold is at a height above the ground greater than:

6 ft, aeroplane on the ground, one main gear or nose gear collapse

If a DC circuit with a total resistance of 2 Ohms has 12 volts DC applied, then the resulting current is:

6:00 AM

Skydrol 7000 is... A ... in colour, requires a...B... seal and is often used because...C...

A green B Butyl-rubber C has better fire retardant properties.

Station numbers (Stn) and water lines (WL) are:

A means of locating airframe structure and components.

What is the purpose of a commutator on an AC generator?

An AC generator has no commutator.

Aircraft standard fuses are fitted to:

DC and AC circuits.

The operating principle of an anti skid system. The brake pressure will be:

Decreased on the slower turning wheels.

Engine thrust is usually displayed in the cockpit as:

EPR or N1

Crew emergency oxygen is provided from:

Gaseous oxygen cylinders

In aviation, the reflection on ionosphere layers phenomenon is used in the following frequencies:

HF

The skip zone of HF-transmission will increase when the following change in circumstance occurs:

Higher frequency and higher position of the reflecting ionosphere layer

When is spark plug fouling most likely to occur?

In the climb if you have not adjusted the mixture

A cantilever wing:

Is supported at one end only with no external bracing.

What are purpose and placing of a " fusible plug" on the tires?

It is placed in the wheel and reacts on temperature. At excessive temperatures it melts which allows the air to escape from the tire, leaving the tire unpressurised.

The noisiest part of a gas turbine engine is the:

Jet efflux

Regulations governing the fitting, marking and use of safety equipment is contained in:

Joint Airworthiness Requirements

In which of the following logic gates are contained the six most common gates?

NAND, NOR, EXOR

Fatigue life of the fuselage is mostly based on:

Number of pressurisation cycles.

What is meant by a wet sump engine?

One that carries its oil supply in the engine itself

What is an advantage of a constant-speed propeller?

Permits the pilot to select the blade angle for the most efficient performance

Hydraulic fluids used in systems of modern airliners are:

Phosphate ester base fluids.

A sine wave has a peak-to-peak voltage of 400 V. Its:

RMS value is 141 V.

In a modern airliner what is hydraulic fluid used?

Synthetic.

Regarding carburettor ice, state the environmental caution areas for the formation of this type of ice.

Temperature between ÷ 5° C and + 18° C, visible moisture or relative humidity greater than 60 %.

The reason for using inverters in an electrical system is.

To change DC into AC.

Freezing point depressant (FPD) is supplied in two types:

Type 1 fluid (unthickened) - Type 2 fluid (thickened)

In the stator of a turbine, the speed V and static pressure Ps vary as follows:

V increases, Ps decreases

What happens to pressure, temperature and velocity of the air in the diffuser of a centrifugal compressor?

Velocity decrease, pressure and temperature increase

In electronic terms, what is a flip-flop?

a bistable multivibrator.

The power source for hot air in de-ice / anti ice systems on jet A/C is:

bleed air from the engines' compressor.

Fuel tank booster pumps are:

centrifugal, low pressure.

The function of the selector valve is to:

communicate system pressure to either side of an actuator.

Air conditioning systems use ... which ... affect engine thrust.

compressor bleed air, does

A piston engine pressure injector delivers fuel to the jets:

continuously

Diluter demand oxygen is provided for:

crew use only.

With increase in altitude, exhaust back pressure will:

decrease and engine power will decrease

To convert from an RMS value to an amplitude it is necessary to:

divide the RMS value by 0,707

If you double the EMF, you will:

double current.

Valve springs:

ensure that the valves are firmly closed

Bonding is used to protect the aircraft against fire by:

ensuring the same electrical potential of all metal components in the aircraft's structure.

When in flight, a piston engine is stopped and the propeller blade pitch angle is near 90° , the propeller is said to be...

feathered

When an underspeed fault is detected on an AC generator connected to the aircraft AC busbar, the protection device opens:

generator breaker

When air is found in a hydraulic system:

have the air bled from the system.

During a power change on an engine equipped with a constant speed propeller, a wrong combination of manifold pressure and RPM values results in excessive pressures in the cylinders. This is the case when one simultaneously selects a...

high manifold pressure and low RPM

Reduction in engine efficiency can be caused by:

ice formation on air intake

Inlet guide vanes are use to:

impart an angular change to the air flow

If the volume of air passing through a carburettor venturi is reduced, the pressure at the venturi throat will:

increase

The horsepower developed in the cylinders of a reciprocating engine is known as the:

indicated horsepower

The electrical power which is supplied to the propeller blades for de-icing purposes:

is controlled to give an intermittent supply.

The pressure filter in a hydraulic system:

is fitted down stream of the pump.

With engine fire alarm activated, the extinguisher discharge:

is the pilot's task

A 12 volt battery that has 1 dead cell:

is unserviceable.

In a 3 phase delta connected AC generator:

line voltage is equal to phase voltage.

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

mass of fuel and mass of air entering the cylinder

With respect to a piston engined aircraft, ice in the carburettor:

may form at OAT's higher than +10° C

The Fan Markers uses the following wavelengths:

metric.

If the pressure in the cabin tends to become lower than the outside ambient air pressure the:

negative pressure relief valve will open.

On the flight deck, an oil operated CSD unit is normally provided with means of monitoring the:

oil over-temperature and low oil pressure.

Engine vibration pick-ups are usually installed...

on the front and aft bearings

On an aircraft with an earth return electrical system:

one lead of the battery and one lead of the electrical components are connected to the aircraft structure

The type of smoke detection system fitted to aircraft is:

optical and ionisation

During normal descent, the discharge valve (outflow valve) position is:

partially open.

The correct formula to calculate the multi-cylinder engine displacement is:

piston area * piston stroke * number of cylinders

Concerning the centrifugal compressor, the compressor diffuser is a device in which the:

pressure rises and velocity falls

Baffles can be mounted inside the tanks to:

prevent fuel sloshes

Nomex gloves are provided on the flight deck to:

protect hands from hot materials during fire fighting

The primary purpose of bonding the metallic parts of an aeroplane is to:

provide safe distribution of electrical charges and currents.

The purpose of protecting a circuit against excessive current conditions is:

to prevent deterioration and failure of the aircraft's wiring and switch gear by excess heat.

Primary airflow is routed:

to the fuel nozzle area for combustion

The nose wheel extension of an aircraft is 2 inches more than normal when the aircraft is correctly loaded, the most likely cause is:

too much nitrogen in the oleo strut.

On a turbocharged piston engine, with increased altitude:

turbine rpm will increase with increased compressor rpm

Capacitive fuel quantity measurement systems compensate for fuel movement in the tanks by:

using more than one measuring probe per tank.

Tyre creep is most likely to occur:

when the tyre is newly fitted.

If the forward oil seal in an axial flow compressor fails, compressed air:

will be contaminated with oil.