UCT Basic Nav and Weather Exam Questions With Verified And Updated Answers

UCT Basic Nav and Weather Exam Questions With Verified And Updated Answers What is the atmosphere? - answerA thin layer of gases surrounding Earth Troposphere - answerAdjacent to earth's surface Large amounts of moisture and condensation Most weather occurs 30,000ft - 60,000ft Standard lapse rate Tropopause - answerThe boundary between the troposphere and the stratosphere Isothermal Frequently find turbulence, contrails, and haze 36,000 MSL avg height over US Jet stream Stratosphere - answerSmooth flying with excellent vis Temperature inversion Atmospheric Pressure - answerPressure exerted on surface due to weight of air Standard: 29.92 or 1013.2 Lapse Rate - answer2C / 1000ft 1 in-Hg / 1000ft Indicated Altitude - answerRead from altimeter. Absolute Altitude - answerthe height above ground level (AGL) True Altitude - answerActual height above mean sea level (MSL) Pressure Altitude - answerThe height above the standard datum plane. Density Altitude - answerThe pressure altitude corrected for nonstandard temperature. Barometric Altimeter - answerDisplays altitude in ft instead of pressure Altimeter Setting - answerCalibrated for standard lapse rate Increasing setting increases altimeter readout Altimeter Pressure Error - answer"High to low, look out below. Low to high, plenty of sky" Altimeter Temperature Error - answerCold air: lower than altimeter read out Warm air: higher than altimeter read out 4% error for every 11C from standard temp Wind - answerBrings about weather changes Transports water vapor Gradient Wind: Tight Spacing - answerSteep pressure gradient Faster winds Gradient Wind: Wide Spacing - answerShallow pressure gradient Slower winds Gradient Wind Flow - answerClockwise around highs CCW around lows Above 2000' AGL Interaction of pressure gradient and Coriolis force results in flows Parallel to isobars Surface Winds - answerBelow 2000' AGL Friction reduces wind speed CW out of high pressure CCW into low pressure Jet Stream - answerNarrow band of strong winds found below tropopause Avg height of 30,000' MSL Speed may reach excess of 250 kts