Category Archives: Instruments and Electronics

Instruments and Electronics

If, in the event of a failure, there is no significant out-of-trim condition or deviation of flight path or attitude but the landing is not completed automatically, such an automatic landing system is considered as:

A: fail-operational.
B: fail-passive.
C: fail-safe.
D: fail-redundant.

 

 

 

 

 

 

 

 

Answer: B

An inner loop automatic flight control system (AFCS) is a system which:

A: controls the aircraft about the lateral axis only (PITCH).
B: contains one or more high speed actuators which move both the inputs to the swashplate and the pilots’ cyclic controls.
C: contains one or more high speed actuators which move the control inputs to the swashplate but not the pilots’ cyclic controls.
D: controls the aircraft about the longitudinal axis only (ROLL).

 

 

 

 

 

 

 

 

Answer: C

The principle of a laser gyro is based on:

A: a gyroscope associated with a laser compensating for apparent wander due to the rotation of the earth.
B: frequency difference between two laser beams rotating in opposite direction.
C: a gyroscope associated with a laser compensating for gimballing errors.
D: two rotating cavities provided with mirrors.

 

 

 

 

 

 

 

 

Answer: B

Gas turbine engine rotational speed (RPM) is usually sensed using either

A: a 28VDC tachometer generator or a DC phonic wheel.
B: a single phase AC tachometer generator or an AC phonic wheel system.
C: a 28VDC tachometer generator or an AC phonic wheel.
D: a 3 phase AC tachometer generator or an AC phonic wheel system.

 

 

 

 

 

 

 

 

Answer: D