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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

Correct Answer :

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel


Related Questions

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A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

A. 5 mm

B. 10 mm

C. 15 mm

D. 25 mm

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4

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

A. Tempering

B. Normalising

C. Annealing

D. Spheroidising

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4

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

A. Hollow saddle key

B. Hollow key

C. Soft key

D. None of these

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4

The piston rod of a steam engine is usually connected to the crosshead by means of

A. Bolted joint

B. Knuckle joint

C. Cotter joint

D. Universal joint

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4

When two helical springs of equal lengths are arranged to form a cluster spring, then

A. Shear stress in each spring will be equal

B. Load taken by each spring will be half the total load

C. Only A is correct

D. Both A and B is correct

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4

The shear stress in a beam varies from zero at the outer fibres to a maximum at the________.

A. Neutral surface

B. Upper surface

C. Lower surface

D. None of these

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4

Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

A. p.d.σt

B. p.t.σt

C. (p - d) σt

D. (p - d) t.σt

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4

Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment?

A. Bushed pin type coupling

B. Universal coupling

C. Oldham coupling

D. All of these

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4

The designation M 33 × 2 of a bolt means

A. Metric threads of 33 numbers in 2 cm

B. Metric threads with cross-section of 33 mm

C. Metric threads of 33 mm outside diameter and 2 mm pitch

D. Bolt of 33 mm nominal diameter having 2 threads per cm

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4

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

A. Same

B. Double

C. One-half

D. One-fourth

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4

The resultant axial load on a bolt depends on

A. Initial tension

B. External load applied

C. Relative elastic yielding (springness) of the bolt and the connected member

D. All of the above

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4

The period during which the cam follower remains at rest, when cam moves, is known as

A. Constant period

B. Fixed period

C. Dwell period

D. Idle period

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4

According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

A. (π/4) d² × τ × n

B. 1.875 × (π/4) d² × τ × n

C. 2 × (π/4) d² × τ × n

D. 3 × (π/4) d² × τ × n

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4

The dedendum circle diameter is equal to (where φ = Pressure angle)

A. Pitch circle diameter × cosφ

B. Addendum circle diameter × cosφ

C. Clearance circle diameter × cosφ

D. Pitch circle diameter × sinφ

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A bolt is designed on the basis of __________ with a large factor of safety.

A. Direct tensile stress

B. Direct compressive stress

C. Direct bending stress

D. Direct shear stress

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Stress concentration is caused due to

A. Variation in properties of material from point to point in a member

B. Pitting at points or areas at which loads on a member are applied

C. Abrupt change of section

D. All of the above

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4

Which of the following screw thread is adopted for power transmission in either direction?

A. Acme threads

B. Square threads

C. Buttress threads

D. Multiple threads

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4

When the belt is transmitting maximum power, the belt speed should be

A. √(Pmax / 2m)

B. √(Pmax / 3m)

C. √(Pmax / m)

D. √(3m /Pmax) Where m = mass of belt per metre (kg/m) Pmax = maximum permissible tension in belt (N)

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4

The cam follower extensively used in aircraft engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

A bolt of uniform strength can be developed by

A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

B. Keeping the core diameter smaller than the diameter of the unthreaded portion

C. Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

D. None of the above

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4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

A. εc + 2εl

B. c + εl

C. εc + εl²

D. εc² + εl

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4

In the assembly of pulley, key and shaft

A. Pulley is made the weakest

B. Key is made the weakest

C. Key is made the strongest

D. All the three are designed for equal strength

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4

When compared to the rod of the same diameter and material, a wire rope

A. Is less flexible

B. Has a much smaller load carrying capacity

C. Does not provide much warning before failure

D. Provides much greater time for remedial action before failure

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Yield point in fatigue loading as compared to static loading is

A. Same

B. Higher

C. Lower

D. Depends on other factors

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4

A plate with an elliptical hole in the centre, with semi-major axis (A) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

A. σ [1 + (b/2a)]

B. σ [1 + (2a/b)]

C. σ [1 + (b/3a)]

D. σ [1 + (3a/b)]

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4

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

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4

Taper usually provided on cotter is

A. 1 in 5

B. 1 in 10

C. 1 in 24

D. 1 in 40

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4

In hydrostatic bearings

A. The Oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

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4

In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

A. Brinell

B. Rockwell

C. Vickers

D. None of the above