DGCA QUESTIONS BANK FOR PILOTS Pressure Pressure Practice Paper for Pressure 1 / 35 1. The 850 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable? FL100 FL 300 FL 390 FL 50 Refer the chart850 hpa is 5000 pressure altitude or fl50 2 / 35 2. Which constant pressure altitude chart is standard for 18,289 FT pressure level (FL 180)? 300 hPa 200 hPa 700 hPa 500 hPa Refer the chart500 hpa is 18000 pressure altitude 3 / 35 3. If you are planning a flight at FL 170, which of these upper wind and temperature charts would be nearest your flight level? 850 hPa 700 hPa 500 hPa 300 hPa Refer the chart500 hpa is 18000 pressure altitudewhich is close to 17000 4 / 35 4. Which constant pressure altitude chart is standard for a 38,662 FT pressure level (FL 390)? 500 hPa 700 hPa 200 hPa 300 hPa Refer the chart200 hpa is 38000 pressure altitude 5 / 35 5. The station pressure used in surface weather charts is QNE QFF QFE QNH Qff is the barometric pressure at the surface reduced to MSL using the observed temperature at the surface and it’s corresponding pressure lapse rate only used for charts 6 / 35 6. Half the mass of the atmosphere is found in the first 8 km 6 km 3 km 11 km 7 / 35 7. A 500 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable? FL 160 FL 100 FL 390 FL 180 Refer the chart500 hpa is 18000 feet 8 / 35 8. Which constant pressure altitude chart is standard for a 4781 FT pressure level (FL50)? 300 hPa 850 hPa 700 hPa 500 hPa 850 hpa is 5000 feet 9 / 35 9. The QNH at an airfield located 200 metres above sea level is 1022 hPa. The air temperature is not available. What is the QFF? It is not possible to give a definitive answer More than 1022 hPa 1022 hPa Less than 1022 hPa temperature is required 10 / 35 10. A 700 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable? FL 180 FL 300 FL 390 FL 100 700 hpa is 10000 feet 11 / 35 11. When planning a flight at FL 60, which upper wind and temperature chart would be nearest your flight level? 300 hPa 850 hPa 700 hPa 500 hPa 850 hpa is 5000 feetclosest to 6000 feet 12 / 35 12. The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QNH? More than 1016 hPa 1016 hPa Less than 1016 hPa It is not possible to give a definitive answer 13 / 35 13. Which of the following is true concerning atmospheric pressure? It always decreases with height at a rate of 1 hPa per 8m It decreases with height It is higher in winter than in summer It is higher at night than during the day 14 / 35 14. The upper wind and temperature chart of 250 hPa corresponds, in a standard atmosphere, to about 32 000 FT 34 000 FT 39 000 FT 30,000 FT since 250 hpa is halfway between 300 hpa and 200 hpa , altitude should be selected between 30000 and 38000 15 / 35 15. What positions are connected by isobars on the surface weather chart? Positions with the same relative pressure heights Positions with the same air pressure at a given level Positions with the same temperature at a given level Positions with the same wind velocity at a given level Isobars are line joining places of the same atmospheric pressure 16 / 35 16. How would you characterise an air temperature of -30°C at the 300 hPa level over Western Europe? Within +/-5°C of ISA Low Very low High as per table pressure altitude is 30000 feetAs per isa 30000 should have(30x-2*) plus 15= —45°c as temperature(-2 being lapse rate)* but temp is -30°hence it is HIGH 17 / 35 17. The QFF at an airfield in California located 69 meters below sea level is 1030 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH? 1030 hPa It is not possible to give a definitive answer More than 1030 hPa Less than 1030 hPa 18 / 35 18. What is the approximate vertical interval which is equal to a pressure change of 1 hPa at an altitude of 5500m? 8 m (27 FT). 32 m (105 FT). 64 m (210 FT). 15 m (50 FT). 5500 metre is 18000 feetclosest is 20000 feet 19 / 35 19. The greater the pressure gradient the closer the isobars and the lower the temperatures further the isobars will be apart and the higher the temperature closer the isobars and the stronger the wind further the isobars will be apart and the weaker the wind Pressure gradient is the horizontal rate of change of pressure perpendicular to be isobars directed from high to low pressure it is steep or weak according to the isobars are close or far apart it is said to be steep isobars are closely packed closer the isobars stronger the winds as wind tend to flow towards low pressure area 20 / 35 20. When planning a flight at FL 110, which upper wind and temperature chart would be nearest your flight level? 700 hPa 850 hPa 300 hPa 500 hPa As per the chart 700 hpa is 10000 feetclosest 21 / 35 21. The QNH at an airfield in California located 69 meters below sea level is 1018 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QFF? 1018 hPa It is not possible to give a definitive answer More than 1018 hPa Less than 1018 hPa 22 / 35 22. The QNH at an airfield located 0 meters above sea level is 1022 hPa. The air temperature is not available. What is the QFF? It is not possible to give a definitive answer 1022 hPa Less than 1022 hPa More than 1022 hPa 23 / 35 23. In what hPa range is an upper weather chart for FL 340 situated? 400 - 300 hPa 500 - 400 hPa 600 - 500 hPa 300 - 200 hPa since 250 hpa is halfway between 300 hpa and 200 hpa , altitude should be selected between 30000 and 38000 24 / 35 24. If you are flying at FL 100 in an air mass that is 10°C warmer than a standard atmosphere, what is the outside temperature likely to be? -10°C -15°C +5°C +15°C Lapse rate in isa -2°C per 1000 feet of climb And temperature is 15 ° C at msl climbing 10000 feet we reduce -2°C every 1000 feet hence temperature lost is -20°Cnow add this to 15° C( temperature at msl)result is -5°C add 10°c.We get 5°c 25 / 35 25. In the troposphere the decrease of pressure per 100 m increase in height is smaller at higher levels than at lower levels. remains constant at all levels. is greater at higher levels than at lower levels. is in the order of 27 hPa near MSL. The air in the lower layers of the atmosphere is compressed by the weight of the air above it. Consequently, air is denser, and atmospheric pressure is greater, at the Earth’s surface than at altitude 26 / 35 26. The QFF at an airfield located 400 meters above sea level is 1016 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH? More than 1016 hPa 1016 hPa It is not possible to give a definitive answer Less than 1016 hPa 27 / 35 27. Isobars on a surface chart are lines of equal QFF QFE QNE QNH QFF is The value of pressure reduced to MSL in accordance with isothermal conditions.Isobars are line joining places of the same atmospheric pressure (usually MSL pressure QFF). 28 / 35 28. A 200 hPa pressure altitude level can vary in height. In temperate regions which of the following average heights is applicable? FL 100 FL 50. FL 390. FL 300. 200 hpa is 39000 feet 29 / 35 29. If you are planning a flight at FL 290, which of these upper wind and temperature charts would be nearest your flight level? 850 hPa 300 hPa 500 hPa 700 hPa 300 hpa is 30000 feetclosest is 300 hpa 30 / 35 30. A 300 hPa pressure level can vary in height. In temperate regions which of the following average heights is applicable? FL 100 FL 50 FL 300 FL 390 31 / 35 31. The QNH at an airfield located 200 metres above sea level is 1009 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QFF? Less than 1009 hPa It is not possible to give a definitive answer More than 1009 hPa 1009 hPa 32 / 35 32. Which constant pressure altitude chart is standard for a 30,065 FT pressure level (FL 300)? 200 hPa 700 hPa 500 hPa 300 hPa 300 hpa is 30000 feet 33 / 35 33. Which constant pressure altitude chart is standard for a 9,882 FT pressure level (FL 100)? 700 hPa 850 hPa 500 hPa 300 hPa Refer the chart 700 hpa is 10000 feet or fl100 34 / 35 34. The isobars drawn on a surface weather chart represent lines of equal pressure at flight level at height of observatory at a determined density altitude reduced to sea level A line joining places of the same atmospheric pressure (usually MSL pressure QFF). 35 / 35 35. If the pressure surfaces bulge upwards in all levels then the pressure system is a cold low cold high warm low warm high Pressure level will bulge upwards in high pressure or warm air mass and other way in a low or cold Your score isThe average score is 0% 0% Restart quiz