Match list I with list II :List IList IIa. Unwin's formulaeI. Bearingb. Wahl factorII. Rivetsc. Reynold's equationIII. Gearsd. Lewis form factorIV. Springs

The correct matching is a-II, b-IV, c-I, d-III.Unwin's formula, \(d = 6\sqrt{t}\), gives the rivet diameter from the plate thickness: rivets.Wahl's factor corrects the shear stress in a helical spring for curvature and direct shear: springs.Reynolds' equation gives the pressure in the oil film of a hydrodynamic bearing: bearings.Lewis form factor enters the beam strength of a gear tooth: gears.Only one option has all four pairs. Options pairing Unwin's formula with bearings, or Wahl factor with gears, are wrong at the first pair.

Match List - I with List - II :List - IList - II(a) Unwin's formulae(i) Bearing(b) Wahl Factor(ii) Rivets(c) Reynold's equation(iii) Gears(d) Lewis form factor(iv) SpringsChoose the most appropriate answer from the options given below :

The correct matching is (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii).Unwin's formula, \(d = 6\sqrt{t}\) (mm), gives the rivet diameter from the plate thickness: rivets (a-ii).The Wahl factor corrects the shear stress in a helical spring for curvature and direct shear (b-iv).Reynolds' equation governs the pressure in a hydrodynamic oil film, the basis of journal bearing design (c-i).The Lewis form factor appears in the Lewis equation for the bending strength of gear teeth (d-iii).The other options give the Wahl factor to gears or Unwin's formula to bearings, neither of which is where they are used.

Design Process and Materials Selection Questions and Answers

Q: In a 6 × 20 wire rope , number 6 indicates the :

The number 6 indicates the number of strands in the wire rope.A wire rope is designated as strands by wires: a 6 × 20 rope has 6 strands, each made of 20 wires, laid round a core. Common constructions include 6 × 7, 6 × 19 and 6 × 37.So 6 is not the number of wires (that is the second number), nor the rope diameter or the wire gauge, which are specified separately.

Match list I with list II :

List I	List II
a. Unwin's formulae	I. Bearing
b. Wahl factor	II. Rivets
c. Reynold's equation	III. Gears
d. Lewis form factor	IV. Springs

A.a-I, b-IV, c-II, d-III
B.a-II, b-III, c-I, d-IV
C.a-I, b-III, c-II, d-IV
D.a-II, b-IV, c-I, d-III

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: D

The correct matching is a-II, b-IV, c-I, d-III.

Unwin's formula, \(d = 6\sqrt{t}\), gives the rivet diameter from the plate thickness: rivets.
Wahl's factor corrects the shear stress in a helical spring for curvature and direct shear: springs.
Reynolds' equation gives the pressure in the oil film of a hydrodynamic bearing: bearings.
Lewis form factor enters the beam strength of a gear tooth: gears.

Only one option has all four pairs. Options pairing Unwin's formula with bearings, or Wahl factor with gears, are wrong at the first pair.

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In a 6 × 20 wire rope , number 6 indicates the :

A.diameter of the wire rope in mm
B.number of strands in the wire rope
C.number of wires
D.gauge number of wire

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: B

The number 6 indicates the number of strands in the wire rope.

A wire rope is designated as strands by wires: a 6 × 20 rope has 6 strands, each made of 20 wires, laid round a core. Common constructions include 6 × 7, 6 × 19 and 6 × 37.

So 6 is not the number of wires (that is the second number), nor the rope diameter or the wire gauge, which are specified separately.

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Match List - I with List - II :

List - I	List - II
(a) Unwin's formulae	(i) Bearing
(b) Wahl Factor	(ii) Rivets
(c) Reynold's equation	(iii) Gears
(d) Lewis form factor	(iv) Springs

Choose the most appropriate answer from the options given below :

A.(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
B.(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
C.(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
D.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: A

The correct matching is (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii).

Unwin's formula, \(d = 6\sqrt{t}\) (mm), gives the rivet diameter from the plate thickness: rivets (a-ii).
The Wahl factor corrects the shear stress in a helical spring for curvature and direct shear (b-iv).
Reynolds' equation governs the pressure in a hydrodynamic oil film, the basis of journal bearing design (c-i).
The Lewis form factor appears in the Lewis equation for the bending strength of gear teeth (d-iii).

The other options give the Wahl factor to gears or Unwin's formula to bearings, neither of which is where they are used.

Discuss in Forum

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