CSYH Practice Cards 1 Flashcards
When cyclic feathering occurs…..
the pitch of each blade is altered consecutively following a cyclic control movement
The application of carburetor heat when ice is present will result in….
a reduction in Maniforld Pressure, then an increase in Manifold Pressure
The purpose of a freewheeling unit is to disconnect the…..
rotor system when the engine RPM slows below the equivalent rotor RPM
On application of carburettor heat when NO ICE is present, the manifold pressure will …
drop and remain at a lower value
if an engine is allowed to operate to long at idling speed …
the spark plugs may become fouled
A condenser is incorporated in the primary circuit of a magneto to …
prevent burning of the points
The function of oil in an engine is to …
clean, lubricate and cool the engine
The viscosity of an oil is a measurement of …
the oils resistance to flow
Force in a hydraulic system is …
pressure multiplied by area
Vertical speed indicators (VSI’s) measure the …
rate of change of static pressure
A low frequency vibration is most likely to be caused by …
an out of track main rotor blade
Rotor trim tabs are used to …
provide a method of adjusting the track of the rotor blades
A rotor brake is used to …
provide rapid deceleration of the rotor after engine shut-down
The duration of each stroke of a 4-stroke cycle is equivalent to …
180 degrees of crankshaft rotation or half a revolution
The generator fails just after take off in an aircraft which has a 48 amp-hour, 24 volt battery. Just prior to failure, the centre zero ammeter was reading 24 amps. Without switching off any loads, the approximate maximum interval before the battery is flat is …
2 hours
The yellow band on the carburettor air temperature gauge indicates ice is …
possible
A rotor blade in a semi-rigid rotor system has freedom to …
feather and flap
If the oil level in an operating engine is below the specified minimum …
the engine could over heat at high power settings
If no anti-torque control was provided the fuselage of the conventional helicopter would …
rotate to the right
An unchanged altimeter reading during climb in an unpressurised aircraft could indicate a …
blocked static vent
A non return valve (check valve) is fitted to a hydraulic circuit to …
ensure fluid only flows in one direction
The purpose of the cooler in an aircraft hydraulic system is to …
cool the fluid as it returns from the pressure regulator to the reservoir
A pressure valve fitted to an aircraft hydraulic system is designed to …
protect the system from excessive pressure in the event of a pressure regulator failure
An aircraft may be equipped with an artificial horizon (attitude indicator) for the purpose of …
establishing attitude reference without external cues
Aircraft engine fire detection systems on board aircraft using fire wire operated by …
heat of the fire changing the impedance of the detector elements in the wire to trigger a cockpit warning
A turn and balance indicator (turn coordinator) in an aircraft is used to …
judge turn rate and slip or skid
The pitot heat system on an aircraft is …
electric
If the waste gate of a turbocharged engine was to stick in the fully closed position …
manifold pressure will rise excessively
The clutch in a helicopter transmission system …
allows the engine to be started and gradually take the load of driving the rotor system
A helicopter is equipped with a conventional centre zero type ammeter. Such an ammeter displays
current flow to and from the battery
Throttle operation, during take-off for an engine fitted with a super charger, should be …
careful operating with attention not to exceed rated boost
As the inlet air temperature increases as a result of use of carburettor heart, power output from the engine will …
decrease
One cause of high oil temperature and low oil pressure could be …
very low level of oil in the sump
The purpose of an oil cooler by-pass is …
to prevent oil from passing through the cooler if it’s already cold
Pressure in a hydraulic system is defined as …
force per unit area
The hydraulic reservoir provides …
a reserve of fluid to compensate for minor leaks
Fuel ice in a piston engine induction system may form …
in the venturi of the carburettor due to the fuel latent heat of vapourisation cooling the air below zero degrees with condensation turning to ice
What is the most likely cause of a fluctuating engine oil pressure gauge …
low oil level
A centre-zero ammeter shows …
a negative deflection when the battery is suppling current
The effect of using carburettor heat on mixture and power is that …
mixture becomes richer and power decreases
