Instrument Rating Exam · Practice

Which of the following best describes 'mountain effect' (terrain error) on VOR signals?

• A.VOR stations located on mountains have a reduced Designated Operational Coverage due to terrain masking
• B.VOR signals attenuate more rapidly in mountainous terrain, reducing the effective range
• C.Mountains block the line-of-sight to the VOR, causing the NAV warning flag to appear
• D.VOR signals are reflected off mountainous terrain, causing multi-path interference and bearing errors on the CDI