Vayudoot Aviation

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:

difference in electrical resistance of the two metals.

different coefficients of expansion of the two metals.

increase in adiabatic cooling as airspeed increases.

increase in pressure as airspeed increases.

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

change of electrical resistance of the two metals.

change of electrical capacitance with change in temperature.

change of electrical resistance with change in pressure.

change of electrical resistance with temperature.

3. At a true airspeed of 500 knots, a ram rise of air temperature can be expected of:

5°C

50°C

25°C

16°C

4. In an aircraft thermometer with an electrical resistance sensor to measure the air temperature, the resistance wire element is probably

potassium

platinum

beryllium copper

plutonium

5. Aircraft air temperature thermometers are shielded to protect them from:

accidental physical damage on the ground or hailstones in flight.

kinetic heating.

solar radiation.

airframe icing.

6. Total Air Temperature is

the maximum temperature attainable by the air when brought to rest, adiabatically.

the temperature indicated on the air temperature thermometer plus the ram rise.

the static air temperature minus the recovery factor.

the recovery factor plus the ram rise.

7. An air temperature probe may be aspirated in order to:

prevent icing.

reduce the effect of solar radiation.

measure air temperature on the ground.

compensate for thermal soaking at the ramp position.

8. Converted into degrees Celsius - 40°F is

-56.5°C

-40°C

-20°C

-108°C

9. The difference between static air temperature and total air temperature is known as

hot ramp radiation.

corrected outside air temperature.

the ram rise.

the recovery factor.

10. Flying at high speed at high altitude, the difference between ram air temperature and static air temperature is:

likely to be less than when flying low and slow.

due to adiabatic cooling.

proportional to the square of the absolute temperature.

due to adiabatic warming.

Question Bank

Questions for AIR TEMPERATURE MEASUREMENT