1- Which of the following channels can be used to estimate cloud top height?:
Visible.
Water vapour.
IR and Visible.
IR.
2- Which of these cloud types can't be observed in the water vapour channel?
Cumulus humilis.
Cumulonimbus capillatus (anvil cirrus).
Cirrus.
Cumulus humilis and cirrus.
3- Which of these cloud types can be viewed in the visible channel?
Cirrus and cumulonimbus.
Cumulus.
Low stratus.
All of them.
4- What is the smallest distinguishable feature that can be seen in the Meteosat visible channel?
1.0 Km.
2.5 km.
7.5 km.
10.5 km.
5- What is the cone of silence? (Choose the best answer.)
The volume under the lowest elevation of the beam
The volume above the highest elevation of the beams
The volume between the lowest and highest scans in clear air mode
The volume between the lowest and highest scans in precipitation mode
6- In which of the following instances would precipitation often go completely unobserved by radar due to the geometry of the radar beam?
A tall thunderstorm producing rain very close to the radar
A tall thunderstorm producing rain about 50 km (31 mi) away from the radar
A low, stratiform cloud producing rain near the radar's maximum unambiguous range and a thunderstorm producing rain behind a mountain located 10 km (6 mi) from the radar.
None of them.
7- What usually doesn't constitute ground clutter that we often see near a radar?
Insects
Birds
Large particulate matter, like dust
Fog
8- Which of the following phenomena appears on radar as evenly scattered bands of weak reflectivity or ripples near the radar, especially during the afternoon? (Choose the best answer.)
Smoke
Chaff
Horizontal convective rolls
Anomalous propagation
9- What reflectivity value is a general threshold that indicates hail? (Choose the best answer.)
40 dBZ
50 dBZ
60 dBZ
70 dBZ
10- Weather satellites measure radiation emitted by the Earth or reflected solar radiation
They are usually passive detection devices.
They are usually active detection devices.
They are usually none of them.
They are usually passive both of them.
