Avionics And Instruments Exam

Question 1

What is the cause of altimeter pressure error?

Answer 1

Static pressure inaccuracies due to disturbed airflow over the static vents caused by manoeuvre or changes in the aircraft configuration (flaps, landing gear, air brakes)

Question 2

What is the term for a device that converts pressure and temperature into electronic signals for processing in an Air Data Computer?

Answer 2

Transducer.

Question 3

What operational and target accuracy are magnetic compasses designed to provide?

Answer 3

An operational accuracy of +- 10 degrees and can approach a target accuracy of 2.5 degrees

Question 4

The output from which component of a gyro-magnetic compass is disconnected during aircraft turns?

Answer 4

Detector unit/flux valve

Question 5

Which of the following are all valid reasons to carry out a compass swing?

Answer 5

Accuracy in doubt, following a lightening strike and operating in a very different magnetic latitude.

Question 6

What are the three classifications of spinning gyroscopes?

Answer 6

Rate, rate integrating, displacement

Question 7

If a torque is applied about an axis perpendicular to a gyroscopes spin axis what will happen?

Answer 7

The gyroscope will precess around an axis mutually perpendicular to both the spin and torque axis.

Question 8

Which of the following statements correctly expresses the application of a rate integrating gyroscope in flight instruments?

Answer 8

It uses the property of precession to measure angular velocity about a designated axis in inertial measurement units.

Question 9

Correctly identify the the basic data bus system components and their function?

Answer 9

Bus controller, remote terminal, bus monitor

Question 10

What is highlighted on this attitude indicator?

Answer 10

Roll scale and indicator showing 20 degrees right bank, balanced turn, aircraft and flight director single cues showing 2.5 degrees pitch up.

Question 11

Which statement correctly describes the parameters shown on this engine indication system?

Answer 11

Fuel flow 272kg per hour, fuel temp 14 degrees, cabin altitude 14,000’

Question 12

What do VOR ground transmitters have in common?

Answer 12

They transmit 2 signals, an omni-directional reference signal and a rotating directional signal.

Question 13

What distinguishes TACAN from VOR?

Answer 13

TACAN operates solely in UHF band, unlike VOR which operates in VHF

Question 14

What is highlighted on the HSI display?

Answer 14

Lateral deviation scale

Question 15

The frequency band of the ILS locator is?

Answer 15

VHF

Question 16

Which of the following correctly summarises INS errors?

Answer 16

Gimballed systems can suffer from gimbal lock during manoeuvring whilst strap down systems require regular cross referencing with other navigation systems eg GPS

Question 17

What is pulse radar?

Answer 17

Short pulses of transmission separated by long intervals.

Question 18

What is the effective beam width (EBW)?

Answer 18

A) The angle through which the beam rotates whilst continuing to give a discernible image from a point response.

Question 19

What are the three basic types of flight instruments?

Answer 19

A) Primary, engine, navigation

Question 20

What is the indirect flight instrument indicator of the altimeter?

Answer 20

A) Pitch