1. The altitude range of mesosphere is ___________
a) 40km to 80km
b) 30km to 50km
c) 50km to 85km
d) 40km to 70km
Explanation: The altitude range of mesosphere is 50km to 85km. Mesosphere is present between stratosphere and thermosphere. The temperature in this region constantly decreases with increase in altitude.
2. The altitude range of stratosphere is ___________
a) 20km to 70km
b) 18km to 50km
c) 10km to 50km
d) 30km to 40km
Explanation: The altitude range of stratosphere is 18km to 50km. Stratosphere extends to an altitude of about 50km above earth’s surface. Stratosphere is above troposphere.
3. Which of the following is the correct order of atmospheric layers with respect to altitude increase?
a) Exosphere < Thermosphere < Mesosphere < Stratosphere < Troposphere
b) Thermosphere < Stratosphere < Mesosphere < Troposphere < Exosphere
c) Troposphere < Stratosphere < Mesosphere < Thermosphere < Exosphere
d) Troposphere < Stratosphere < Mesosphere < Exosphere < Thermosphere
Explanation: The correct order of atmospheric layers with respect to altitude increase is troposphere < Stratosphere < Mesosphere < Thermosphere < Exosphere. The altitude range of troposphere is 8km to 18km. The altitude range of stratosphere is 18km to 50km. The altitude range of mesosphere is 50km to 85km. The altitude range of thermosphere is 90km to 500km. The altitude range of exosphere is 500km to 10000km.
4. The altitude range of exosphere is ________
a) 400km to 1000km
b) 500km to 1000km
c) 500km to 10000km
d) 500km to 5000km
Explanation: The altitude range of exosphere is 500km to 10000km. The exosphere is the topmost layer of earth and next to this starts the outer space of solar system. This region has a temperature of 1700°C.
5. ADD stands for ____________
a) Airflow Direction Detector
b) Aircraft Direction Detector
c) Airflow Density Detector
d) Aircraft Density Detector
Explanation: ADD stands for airflow direction detector. The function of airflow direction detector is to sense the local flow direction relative to the aircraft body axes and these are the part of the aircraft system.
6. The essential requirement of air data measurement is the state of the atmosphere in which the aircraft is flying.
a) True
b) False
Explanation: The essential requirement of air data measurement is the state of the atmosphere in which the aircraft is flying. The second essential requirement of air data measurement is the relative motion between the aircraft and the air mass.
7. Air data measurement does not consider the relative motion between the aircraft and the air mass.
a) True
b) False
Explanation: The essential requirement of air data measurement is the relative motion between the aircraft and the air mass. The second essential requirement of air data measurement is the state of the atmosphere in which the aircraft is flying.
8. ADC stands for _____________
a) Aircraft Data Computer
b) Air Data Computer
c) Air Density Computer
d) Air Data Computation
Explanation: ADC stands for air data computer. This is a device installed in aircraft to convert pressure into electrical signals. The conversion is done with the help of transducers which help in processing the electrical signals.
9. ADC is a pure mechanical instrument installed in an aircraft.
a) True
b) False
Explanation: ADC is an electrical power based system and not a pure mechanical instrument. ADC stands for air data computer. This is a device installed in aircraft to convert pressure into electrical signals. The conversion is done with the help of transducers which help in processing the electrical signals.
10. 1 knot=________km/hr
a) 1.773
b) 1.852
c) 1.609
d) 1.414
Explanation: 1 knot=1.852 km/hr. Knot stands for nautical miles per hour. Conversion of nautical miles to kilometers is 1 nautical mile=1.852km. Hence, 1 knot=1.852 km/hr.