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单选题 What is the expected duration of an individual microburst
学科：默认课程
时间：2026-03-10 08:10:33
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题目1单选题
What are the reasons for thunderstorm formationA. moist and unstable atmosphere, steep lapse rateB. moist and stable atmosphereC. unstable lapse rate and moist atmosphere
题目2单选题
When the in-cloud temperature and under-cloud temperature both are below zero, there will be ( )A. wet snowB. dry snowC. freezing rain and dry snow
题目3单选题
What is the expected duration of an individual microburstA. one microburst may continue for as long as 2 to 4 hoursB. two minutes with maximum winds lasting approximately 1 minuteC. seldom longer than 15 minutes from the time the burst strikes the ground until dissipation
题目4单选题
Turbulence encountered above 15,000 feet AGL, not associated with cloud formations, should be reported asA. convective turbulenceB. clear air turbulenceC. high altitude turbulence
题目5单选题
Which type jetstream can be expected to cause the greater turbulenceA. A straight jetstream associated with a high-pressure ridgeB. A jetstream associated with a wide isotherm spacingC. A curving jetstream associated with a deep low pressure trough
题目6单选题
Which condition would INITIALLY cause the indicated airspeed and pitch to increase and the sink rate to decreaseA. Sudden increase in a headwind componentB. Tailwind which suddenly increases in velocityC. Sudden decrease in a headwind component
题目7单选题
Which of the following will cause advection windA. The horizontal difference of the temperatureB. The difference of the atmosphereC. The wind moves up and down to the mountain
题目8单选题
The flight crew learn that there is a stationary front over their destination airport. Therefore, they can conceive the present weather at the destination asA. cirrus, radiation fogs or strong turbulenceB. cumulus, shower, thunderstorm, good visibilityC. stratus, light rain, poor visibility cause by low clouds or fog
题目9单选题
In average, for every 1,000 feet increase in the troposphere, the temperature of the air willA. descend 2°CB. descend 4°CC. descend 3°C
题目10单选题
Summer thunderstorms in the arctic region will generally moveA. directly north to south with the low level polar airflowB. southwest to northeast with the jetstream flowC. northeast to southwest in polar easterlies
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