Vayudoot Aviation

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

beryllium copper

potassium

platinum

plutonium

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

change of electrical capacitance with change in temperature.

change of electrical resistance with temperature.

change of electrical resistance with change in pressure.

change of electrical resistance of the two metals.

3. 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.

4. Converted into degrees Celsius - 40°F is

-56.5°C

-108°C

-20°C

-40°C

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

due to adiabatic warming.

likely to be less than when flying low and slow.

due to adiabatic cooling.

proportional to the square of the absolute temperature.

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

the recovery factor.

the ram rise.

hot ramp radiation.

corrected outside air temperature.

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

prevent icing.

measure air temperature on the ground.

compensate for thermal soaking at the ramp position.

reduce the effect of solar radiation.

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

airframe icing.

kinetic heating.

solar radiation.

accidental physical damage on the ground or hailstones in flight.

9. Total Air Temperature is

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

the recovery factor plus the ram rise.

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

the static air temperature minus the recovery factor.

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

5°C

25°C

50°C

16°C

Question Bank

Questions for AIR TEMPERATURE MEASUREMENT