Question

Which of the following is true with reference to semi-infinite tape using a two track tape?

(a) Can simulate a two way tape

(b) Upper track represents the head-right cells

(c) Lower track represents the head-left cells

(d) All of the mentioned

I got this question in examination.

Asked question is from Multistack Machines, Counter Machines in section Introduction to Turing Machines of Automata Theory

Answer 1

The correct answer is:

(d) All of the mentioned

Explanation: In the context of a semi-infinite tape used in a two-track tape system, the setup generally follows these rules:

• Upper track represents the head-right cells, meaning the cells that the head can read or write to while moving to the right.
• Lower track represents the head-left cells, meaning the cells that the head can read or write to while moving to the left.
• Can simulate a two-way tape, as both directions (left and right) of tape movement can be represented and managed with two tracks.

This arrangement provides a way to simulate the behavior of a two-way infinite tape using a semi-infinite tape with two tracks, where each track stores information corresponding to a different direction of movement.