1. A trough of low pressure is generally associated with:
a) Convergence causing increased cloud and precipitation.
b) Divergence causing increased cloud and precipitation.
c) Subsidence causing increased cloud and precipitation.
d) Subsidence causing decreased cloud and precipitation.
2. A ridge of high pressure is generally associated with:
c) Divergence causing cloud to break up and more precipitation.
d) Divergence and subsidence causing clear skies and good weather.
3. An area of indeterminate pressure between two lows and two highs is called:
A trough.
A ridge.
A col.
A saddle.
4. An aircraft is flying at 3000 feet indicated with the altimeter sub scale set to 1020 mb towards a mountain range with an elevation of 1600 feet. If during the flight the QNH in the area falls to 989 mb and the altimeter sub scale is not reset, the expected clearance over the mountain range will be: (assume 27 feet =1 mb):
a) 1400 ft.
b) 470 ft.
c) 930 ft.
d) 563 ft.
5. The altimeter subscale is set to 1030 mbs and the altimeter reads 4500’. QNH is 996 mb. What is the altitude of the aircraft? (Assume 1mb =27’):
a) 3480’.
b) 3990’.
c) 5418’.
d) 3582’.
6. If in the southern hemisphere an aircraft in flight at 2000 ft is experiencing starboard drift, the aircraft is flying towards:
a) An area of high pressure.
b) An area of low pressure.
c) A warm front.
d) A depression.
