A three- throw requires

Question

Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 1)

Answer 1

Explanation:

Three-throw:

In a three-throw arrangement, two turnouts take off from the same point of a mainline track.
A three-throw switch can have contrary flexure or similar flexure.
Three-throw switches are used in congested goods yards and at entry points to locomotive yards, where there is a great limitation of space.
A three-throw switch has two switches and each switch has two tongue rails placed side by side.
There is a combined heel block for both the tongue rails of the switch.
The switches can be operated in such a way that movement is possible in three different directions, i.e., straight, to the right, and to the left.
Three-throw switches are obsolete now as they may prove to be hazardous, particularly at higher speeds, because the use of double switches may lead to derailments.