RPM at the crankshaft.

Percentage of maximum rpm at each shaft.

The speed of the incoming air.

All are false.

In the centrifugal type mass separates in proportion to the shaft rotating speed.

Friction tachometers are very common in aviation.

Magnetic drag tachometers use permanent magnets.

There are four types.

Electrical generator with the rotor being linked to the engine rotational speed

DC or AC. It is autonomous from the electrical aircraft system.

Indicator unit is a squirrel cage induction motor fed with the current generated at detector. It is joint to a mechanism similar to the one in magnetic drag tachometers

All of above are correct.

Magnetic field detection: permanent magnet solidary to the engine and a coil detector unit

Parasitic current detection: due to the blades crossing in front of a sensor

Both are false

Both are true

Damaged compressor / turbine blade(s)

Uneven temperature distribution around turbine blades

Both are true

Both are false

Process data from sensors.

Detect errors.

All are correct

Conversion volume is weight

Digitally displays the amount of fuel in each tank on a flight deck indicator and provides an indication of the total amount of fuel on board the aeroplane

Allows the crew to select the amount of fuel to be refuelled

Uses a motor driven impeller through which the fuel passes and makes the fuel swirl at a rotation rate proportional to the flow rate. Then, the swirling fuel impacts a receiver turbine, inducing a rate of rotation proportional to the swirl rate.

All are correct

All are true.

It is a part of the EIS

Displays primary engine indications

provides a centrally located crew alerting system for non-normal situations