ATMOSPHERE – Air – DGCA Question Bank For Politics

#1. When considering air: 1- Air has mass 2- Air is not compressible 3-Air is able to flow or change its shape when subject to even small pressures 4-The viscosity of air is very high 5-Moving air has kinetic energy. The correct combination of all true statements is:

1,2,3 and 5

2,3 and 4

1 and 4

1,3,and 5

#2. Why do the lower the layers contain the greater proportion of the whole mass of the atmosphere:

Because air is very viscous

Because air is compressible

Because of greater levels of humidity at low altitude

Because air has very little mass

#3. With increasing altitude, up to about 40000 ft, the characteristics of air change: 1- Temperature decrease continuously with altitude 2-Pressure falls steadily to an altitude of about 36000 ft , where it then remains constant. 4-Pressure falls steadily with increasing altitude. The combination of true statements is:

3 and 4

1,2, and 3

2 and 4

1 and 4

#4. When considering static pressure: 1-In aviation, static pressure can be measured in hectopascal=s 2-The SI units for static pressure is N/m² 3-Static pressure is the product of the mass of air pressing down on the air beneath 4-Referred to as static pressure because of the air's stationary or static presence 5-The lower the altitude, the greater the static pressure. The correct statements are:

2,4 and 5

1,2,3,4 and 5

1,3 and 5

1 and 5

#5. When considering air density: 1-Density is measured in millibar =s 2-Density increases with increasing altitude 3-If temperature increases the density will increase 4-As altitude increases, density will decrease 5-Temperature decreases with increasing altitude, this will cause air density to increase. The combination of correct statement is:

4 only

4 and 5

5 only

2,3 and 5

#6. Air density is:

Mass per unit volume

Proportional to temperature and inversely proportional to pressure

Independent of both temperature and pressure

Dependent only on decreasing pressure with increasing altitude.

#7. When considering the ICAO International Standard Atmosphere and comparing it with the actual atmosphere, which of the following statements is correct: 1-Temperature , pressure and density are constantly changing in any given layer of the actual atmosphere. 2-A requirement exists for a hypothetical 'standard' atmosphere. 3-The values given in the International Standard Atmosphere exist at a the same altitudes in the actual atmosphere. 4-The International Standard Atmosphere was designed for the calibration of pressure instruments and the comparison of aircraft performance calculations

1,2 and 3.

2,3 and 4

1,2,3, and 4

1,2 and 4

#8. When considering the ICAO International Standard Atmosphere, which of the following statements is correct: 1-The temperature lapse rate is assumed to be uniform at 2°C per 1,000 ft (1.98°C. up to a height of 11,000 ft. 2-Sea level temperature is assumed to be 15°C 3-Sea level static pressure is assumed to be 1.225 kg/m³ 4-Sea level density is assumed to be 1013.25 hPa

No statements are correct

1,2,3 and 4

1,3, and 4

2 only

#9. A moving mass of air possesses kinetic energy. An object placed in the path of such a moving mass of air will be subject to which of the following:

Dynamic pressure

Static pressure

Static pressure and dynamic pressure

Dynamic pressure minus static pressure

#10. Dynamic pressure is:

The total pressure at a point where a moving airflow is brought completely to rest.

The amount by which the pressure rises at a point where a moving airflow is brought completely to rest.

The pressure due to the mass of air pressing down on the air beneath

The pressure change caused by heating when a moving airflow is brought completely to rest.

#11. Dynamic pressure is equal to:

Density times speed squared

Half the density times the indicated airspeed squared

Half the true airspeed times the density squared

Half the density times the true airspeed squared

#12. A tube facing into an airflow will experience a pressure in the tube equal to:

Static pressure

Dynamic pressure

Static pressure plus dynamic pressure

The difference between total pressure and static pressure

#13. A static pressure vent must be positioned:

On a part of the aircraft structure where the airflow is undisturbed, in a surface at right angles to the airflow direction.

On a part of the structure where the airflow is undisturbed, in a surface parallel to the airflow direction.

At the stagnation point

At the point on the surface where the airflow reaches the highest speed

#14. The inputs to an Airspeed Indicator are from:

A static source

Pilot pressure

A pilot and a static source

Pilot, static and density

#15. The deflection of the pointer of the Air Speed Indicator is proportional to:

Dynamic pressure

Static pressure

The difference between static and dynamic pressure

Static pressure plus dynamic pressure

#16. Calibration of the Air Speed Indicator is based upon the density:

At the altitude at which the aircraft is flying.

At sea level ICAO International Standard Atmosphere temperature

At sea level

At sea level ICAO International Standard Atmosphere +15°C temperature

#17. When considering the relationship between different types of air speed: 1-True Air Speed (TAS) is read directly from the Air Speed Indicator. 2-Equivalent Air Speed is Indicated Air Speed corrected for position error 3-Indicated Air Speed is not a speed at all,i's a pressure 4- True Air Speed is the Speed of the aircraft through the air. Which of the above statements are true:

1 only

2 and 3

3 and 4

1 and 4

#18. When considering the relationship between different types of air speed: 1-Calibrated AirSpeed is Indicated Airspeed corrected for position error 2-Equivalent Air Speed is Indicated Air Speed corrected for position error and compressibility 3-Position error, which causes false Indicated Airspeed readings, is due to variations in the pressures sensed at the pitot and static ports. 4-The Air Speed Indicator is calibrated to read True Air Speed when the ambient density is that of the ICAO International Standard Atmosphere at sea level. The combination of correct statements is:

Non of the statements are correct

1,2 and 4

2 and 3

1,2,3 and 4

#19. The speed of sound:

Is dependent upon the True Air Speed and the Mach number of the aircraft.

Is inversely proportional to the absolute temperature.

Is proportional to the square root of the absolute temperature of the air

Is directly proportional to the True Air Speed of the aircraft

#20. Mach number is:

The aircraft True Air Speed divided by the local speed of sound

The speed of sound in the ambient conditions in which the aircraft is flying

The True Air Speed of the aircraft at which the relative airflow somewhere on the aircraft first reaches the local speed of sound

The Indicated Air Speed divided by the local speed of sound sea level

#21. An aircraft's critical Mach number is;

The Speed of the aircraft when the airflow somewhere reaches the speed of sound

The speed of the airflow when the aircraft first becomes supersonic

The Indicated Airspeed when the aircraft first becomes supersonic

The aircraft's Mach number when airflow over it first reaches the local speed of sound

Dgca Question Bank For Pilots

Results

#1. When considering air: 1- Air has mass 2- Air is not compressible 3-Air is able to flow or change its shape when subject to even small pressures 4-The viscosity of air is very high 5-Moving air has kinetic energy. The correct combination of all true statements is:

#2. Why do the lower the layers contain the greater proportion of the whole mass of the atmosphere:

#6. Air density is:

#9. A moving mass of air possesses kinetic energy. An object placed in the path of such a moving mass of air will be subject to which of the following:

#10. Dynamic pressure is:

#11. Dynamic pressure is equal to:

#12. A tube facing into an airflow will experience a pressure in the tube equal to:

#13. A static pressure vent must be positioned:

#14. The inputs to an Airspeed Indicator are from:

#15. The deflection of the pointer of the Air Speed Indicator is proportional to:

#16. Calibration of the Air Speed Indicator is based upon the density:

#19. The speed of sound:

#20. Mach number is:

#21. An aircraft's critical Mach number is;