BTEC unit 48 – Function and Characteristics of Railway Signalling Systems

[train_destroyer]

Currently completing a railway apprenticeship, which consists of a NVQ and BTEC level 3.
One unit is the BTEC unit 48 – Function and Characteristics of Railway Signalling Systems.
I need help with the questions.

this is the thread that includes the images for the questions
http://irseexam.co.uk/thread-1736.html