18 Flashcards
AC voltage:
Varies in amplitude and polarity
The frequency of aircraft constant frequency AC systems is normally maintained between:
380 and 420 HZ
The output voltage of an AC generator is usually controlled by:
Controlling the strength of the magnetic field
The output frequency of an AC generator is governed by:
Controlling the RPM of the armature
Single phase 115 VAC 400 HZ equipment may be used with a three phase 115 VAC 400 HZ supply providing it is connected:
Between any phase and earth
The field excitation current for AC generators is:
DC and may be varied to control output voltage
The normal frequency range of a frequency wild generator (ACW) is between:
350 and 500 HZ
An AC generator driven by a constant speed drive unit
Requires a voltage controller to maintain constant voltage under load
POWER FACTOR is define as:
The ratio between true power and apparent power
An auto-transformer:
Has only one coil which is used as both primary and secondary
Airflow behind a normal (vertical) shockwave compared to a head of the shock will have a decrease in:
Energy (total pressure)
Subsonic flow through a divergent duct will experience
Constant density, an increase in pressure and a decrease in velocity
The reflex camber in most supercritical wings is there to:
Allow an increase in MCRIT thus allowing a higher cruising speed with no real increase in drag
Which of the following is specific air range?
Fuel flow divided by TAS
Where is the fuel sensor transmitter located?
After fuel control unit
