Which of the following is/are correct labelling of \(P\), \(Q\), \(R\), \(S\), \(T\) with respect to the illustration of a suspension bridge as shown below?
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Match each letter to a standard suspension bridge part: tower = pylon, main dipping cable = primary suspended cable, sloped cable to ground = stay cable, ground block = anchorage, horizontal traffic girder = stiffening deck.
Step 1: Learn the parts of a suspension bridge.
A suspension bridge carries its deck from a main cable that runs over two towers and anchors into the ground at each end. Five parts matter here.
The pylon (tower) is the tall vertical support that lifts the main cable above the deck.
The primary suspended cable (main cable) is the large cable that runs from anchorage to anchorage, draped over the two pylons, and dips down between them.
The sag is just the vertical drop of that cable at mid span, a measurement, not a physical part.
The stay cable is the straight length of the main cable that runs down from the pylon top to the ground anchorage.
The anchorage is the massive block in the ground that holds the cable ends.
The stiffening deck is the horizontal girder that carries traffic and gets its support from the hangers hung off the main cable.
Step 2: Match each letter to the figure.
\(T\) sits at the lowest point of the curved cable between the two towers, so \(T\) is the primary suspended cable.
\(Q\) sits on the sloped cable segment running from the top of the right pylon down to the ground, so \(Q\) is the stay cable.
\(R\) sits between the deck and the main cable, on the horizontal member that the hangers tie into and that carries the roadway, so \(R\) is the stiffening deck.
\(S\) sits at deck level right against the vertical tower, so \(S\) is the pylon.
\(P\) sits at the point where the cable meets the ground block, so \(P\) is the anchorage.
Step 3: Check each option against this key.
Option (A) calls \(R\) a pylon and \(T\) a "sag". Both are wrong: \(R\) is the stiffening deck, and sag is a measured quantity, not a labelled part, so (A) fails.
Option (B) states \(P\) - Anchorage, \(S\) - Pylon, \(T\) - Primary Suspended Cable. All three match Step 2, so (B) is correct.
Option (C) states \(Q\) - Stay Cable, \(R\) - Stiffening Deck, \(S\) - Pylon. All three match Step 2, so (C) is correct.
Option (D) calls \(P\) the stiffening deck and \(R\) the pylon. Both are swapped: \(P\) is the anchorage and \(R\) is the stiffening deck, so (D) fails.
Final Answer:
Options (B) and (C) give the correct labelling.
\[ \boxed{(B), (C)} \]
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