IFR Navaids - NDB ADF

If night effect becomes apparent you may improve the accuracy by:

• Decreasing altitude

• Tuning to a station closer to the coast

• Tuning to a closer station

• Using the aural null method of obtaining a bearing

When the induced signals from the loop and sense antenna are combined in an ADF receiver, the resultant polar diagram is called

• A Limacon

• A Cardioid

• A figure of eight

• Circular

Coastal refraction on an ADF bearing will be increased if the:

• Beacon is further inland

• Beacon is nearer the coast

• Aircraft is further away from the coast

• Aircraft is nearer the coast

Which of the following factors could cause an error to an ADF bearing?

• Which of the following factors could cause an error to an ADF bearing?

• Tropospheric scatte

• Scalloping

• Night effect

An NDB radio wave is moving from land to sea. On crossing the coast the wave will bend ______ the coast. If flying at 90 degrees to the coast, the refraction will be at it's ________

• Away, Maximum

• Towards, Minimum

• Towards, Maximum

• Away, Minimum

An NDB transmits a signal pattern which is:

• a 30hz poar diagram

• Omni-directional

• A bi-lobal pattern

• A beam rotating at 30hz

NDB is a ____ transmitter within the assigned frequency band ____

• MF/HF band and a frequency range of 190-1750 Khz

• LF/MF band and a frequency range of 190-1750 Hz

• MF/HF band and a frequency range of 190-1750 Hz

• LF/MF band and a frequency range of 190-1750 Khz

When ADF equipment which incorporates a sense aerial and a loop aerial is tuned to an NDB and the loop is rotated so that a sharp null is found, the aerial is:

• Upside down to the incoming signals

• In line with the incoming signals

• At right angles with the incoming signals

• Aligned with the aircraft nose

In an ADF system, night effect is most pronounced:

• During long winter nights

• When the aircraft is at low altitude

• When the aircraft is at high altitude

• At dusk and dawn

Fading of an ADF signal,together with a hunting needle is an indication of:

• Mountain Effect

• Quadrantal error

• Thunderstorm effect

• Night effect