Air Temperature Measurement: DGCA Air Navigation questions

Question 1

A direct reading aircraft thermometer usually consists of a bimetallic helix protruding into the airstream. Movement of the pointer over the temperature scale will depend upon:

Accepted Answer

Different coefficients of expansion of the two metals

Answer

Difference in electrical resistance of the two metals

Answer

Increase in pressure as airspeed increases

Answer

Increase in adiabatic cooling as airspeed increases

Question 2

A remote reading thermometer depends on .......... to indicate changes in temperature:

Accepted Answer

Change of electrical resistance with temperature

Answer

Change of electrical resistance of the two metals

Answer

Change of electrical resistance with pressure

Answer

Change of electrical capacitance with temperature

Question 3

Aircraft air temperature thermometers are shielded to protect them from:

Accepted Answer

Solar radiation

Answer

Accidental physical damage on the ground or hailstones in flight

Answer

Airframe icing

Answer

Kinetic heating

Question 4

At a true airspeed of 500 knots, what is the ram rise?

Accepted Answer

25°C

Answer

50°C

Answer

5°C

Answer

16°C

Question 5

An air temperature probe may be aspirated in order to:

Accepted Answer

Reduce the effects of solar radiation

Answer

Prevent icing

Answer

Compensate for moisture level at the ramp position

Answer

Measure air temperature on the ground

Air Temperature Measurement: DGCA Air Navigation questions

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