Dgca question bank for pilots DENSITY1 Density 1 Question Paper Practice Paper of Density 1 1 / 7 1. Consider the following statements relative to Air Density and select the one which is correct: Because air density increases with decrease of temperature, air density must increase with increase of height in the International Standard Atmosphere (ISA.. At any given surface temperature the air density will be greater in anticyclonic conditions than it will be when the MSL pressure is lower. Air density increases with increase of relative humidity. The effect of change of temperature on the air density is much greater than the effect of change of atmospheric pressure DENSITY IS DIRECTLY PROPORTIONAL TO PRESSUREanticylone is high pressure systemhence density altitude will increase with high pressure 2 / 7 2. The tropopause in mid latitudes is: Lower in summer with a lower temperature. Lower in winter with a higher temperature. Lower in summer with a higher temperature. Lower in winter with a lower temperature. Along the surface of the earth density will be higher at the poles than at the equator. This is because the surface pressure at the poles is relatively higher than the equator and because the temperature is much colder than at the equator.8 km above the earth surface reversal occurs density will be higher at the equator and lower at the polls hence tropopause are Lower in winter with a higher temperature. 3 / 7 #3. Generally as altitude increases: temperature decreases and density increases temperature, pressure and density decreases temperature and pressure increase and density decreases temperature decreases and pressure density increases as altitude increases according to the ISA conditions lapse rate is 2°C hence temperature decreasesAs altitude increases, the effect of pressure decreasing causes density to fall despite the fact that temperature decreasesAnd as we all know DENSITY IS DIRECTLY PROPORTIONAL TO PRESSURE density also decreases 4 / 7 #4. In the troposphere over cold air, the pressure is higher at upper levels than at similar levels over warm air over cold air, the pressure is lower at upper levels than at similar levels over warm air over warm air, the pressure is lower at upper levels than at similar levels over warm air the upper level pressure depends solely on the relative humidity below molecules in cold air are closely packedmolecules in warm air are loosely packed a column of cold air on the left, and a column of warm air on the right. Notice that, since cold air causes pressure to fall more rapidly with height, the pressure levels in the cold air column are compressed towards the Earth’s surface, whereas, in the warm air column, they expand away from the surface. 5 / 7 5. Density at the surface will be low when: Pressure is high and temperature is high Pressure is high and temperature is low. Pressure is low and temperature is low. Pressure is low and temperature is high. DENSITY IS INVERSELY PROPORTIONAL TO TEMPERATUREHencetemperature increasesdensity decreasesDENSITY IS DIRECTLY PROPORTIONAL TO PRESSUREpressure decreases density decreases 6 / 7 6. At FL 180, the air temperature is -35°C.The air density at this level is: Equal to the density of the ISA atmosphere at FL 180. Unable to be determined without knowing the QNH. Greater than the density of the ISA atmosphere at FL 180. Less than the density of the ISA atmosphere at FL 180 DENSITY IS DIRECTLY PROPORTIONAL TO PRESSUREpressure is constant in this caseDENSITY IS INVERSELY PROPORTIONAL TO TEMPERATUREHence temperature decreases density increases 7 / 7 7. Under what condition does pressure altitude have the same value as density altitude? At sea level when the temperature is 0°C When the altimeter has no position error. When the altimeter setting is 1013,2 hPa. At standard temperature. Density altitude is pressure altitude corrected for nonstandard temperature if temperature is standard density altitude is equal to pressure altitude Your score isThe average score is 0% 0% Restart quiz