Temperature | Thermometers

Question 1

A remote bulb thermometer is a bulb and Bourdon tube with ___ or ___

Answer 1

liquid vapour

Question 2

In a remote bulb thermometer, expansion of the liquid causes the tube to ___, which moves the indicator

Answer 2

lengthen

Question 3

A remote bulb thermometer suffers from indicator errors with changes is ___ ___

Answer 3

atmospheric pressure

Question 4

A resistive coil thermometer is a piece of ___/___ coil whose resistance changes with absolute temperature.

Answer 4

nickel/platinum

Question 5

A resistive coil thermometer is in a circuit with ___ voltage, changes in which are measured with a meter calibrated in C

Answer 5

fixed

Question 6

A bimetallic strip thermometer is used for anything which travels slower than ___kts

Answer 6

150

Question 7

Errors associated with a metallic strip thermometer include ___ and ___

Answer 7

exposure to the sun, kinetic heating from sking friction

Question 8

A thermistor has a ___ change in resistance than with a resistive coil, making changes ___ to detect

Answer 8

greater, easier

Question 9

The error associated with a thermistor is ____ between instruments

Answer 9

poor consistency between instruments

Question 10

A ratiometer measures an unknown electrical ___ by balancing two legs of a bridge circuit, one of which contains the unknown component.

Answer 10

resistance

Question 11

Ratiometers are commonly used in ___

Answer 11

Air Data Computers

Question 12

As the bridge in the ratiometer becomes unbalanced, the varying ___ across the middle can be measured.

Answer 12

voltage

Question 13

The main advantage of the ratiometer is that it works independently of the supply of ___.

Answer 13

voltage

Question 14

The rosemount probe is AKA the ___ probe

Answer 14

TAT

Question 15

The Rosemount probe has a small ___ based resistance coil inside concentric cyclinders, mounted on a streamlined strut ___mm from the fuselage skin.

Answer 15

platinum 50

Question 16

The Rosemount probe is open at the front with a smaller hole at the back to allow air to flow through, but it’s forced through __ degrees to encourage water and dust particles to separate as it speeds up.

Answer 16

90

Question 17

The aircraft must be ___ for the Rosemount probe to work.

Answer 17

moving

Question 18

The Rosemount probe has a ___ element to prevent icing, and is self-compensating. As the temperature ___, so does the resistance in the element, which reduces the heater current.

Answer 18

heating increases

Question 19

Direct sunlight will cause the Rosemount probe to give an artificially ___ reading

Answer 19

high

Question 20

When flying from cloud to clearer air, the Rosemount probe will read ___ for however long it takes for moisture to evaporate from the element in the probe.

Answer 20

low

Question 21

An uncompensated Rosemount probe has _ platinum sensor, a fully compensated has _

Answer 21

1 2

Question 22

___ error is caused by solar heating and icing. Residual errors can only be minimised, and not corrected for.

Answer 22

Environmental

Question 23

Compression only becomes a problem when you need to find the ___

Answer 23

SAT

Question 24

Flat plate sensors can be heated by the ___, and are affected by ___ heating

Answer 24

sun frictional