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Current Affairs January 2024

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4

The permissible stress for carbon steel under static loading is generally taken as

A. 2000-3000 kg/m²

B. 3000-4000 kg/cm²

C. 4000-4500 kg/cm²

D. 7500-10,000 kg/cm²

Correct Answer :

C. 4000-4500 kg/cm²


Related Questions

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4

The design of shafts made of brittle materials is based on

A. Guest's theory

B. Rankine's theory

C. St Venant's theory

D. Von Mises theory

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4

The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

A. Static load

B. Dynamic load

C. Static as well as dynamic load

D. Completely reversed load

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4

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

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4

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

A. 45 to 60 %

B. 63 to 70 %

C. 70 to 83 %

D. 80 to 90 %

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4

In composite or reverse laid ropes

A. Direction of twist of wires in strands is opposite to the direction of twist of strands

B. Direction of twist of wires and strands are same

C. Wires in two adjacent strands are twisted in opposite direction

D. Wires are not twisted

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4

The washer is generally specified by its

A. Outer diameter

B. Hole diameter

C. Thickness

D. Mean diameter

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4

The material generally used for aircraft components is

A. Mild steel

B. High speed steel

C. Stainless steel

D. Aluminium

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4

Antifriction bearings are

A. Sleeve bearings

B. Hydrodynamic bearings

C. Thin lubricated bearings

D. None of the above

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4

The material used for brake lining should have __________ coefficient of friction.

A. Low

B. High

C. Moderate

D. None of these

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4

The bending stress in a curved beam is

A. Zero at the centroidal axis

B. Zero at the point other than centroidal axis

C. Maximum at the neutral axis

D. None of these

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4

If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

A. Maximum principal stress theory

B. Maximum shear stress theory

C. Maximum strain energy theory

D. Maximum distortion energy theory

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4

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

A. Knuckle joint

B. Cotter joint

C. Oldham coupling

D. Universal joint

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4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to

A. [(√P1 + √P2)/2]²

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

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4

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel

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4

For maximum power, the velocity of the belt will be

A. √(T/m)

B. √(T/2m)

C. √(T/3m)

D. None of these

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4

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

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4

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

A. Angular bevel gears

B. Mitre gears

C. Internal bevel gears

D. Crown bevel gears

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4

A key made from a cylindrical disc having segmental cross-section, is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Gib head key

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4

Rivets are generally specified by

A. Thickness of plates to be riveted

B. Length of rivet

C. Diameter of head

D. Nominal diameter

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4

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

A. Both the ends fixed

B. Both the ends hinged

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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4

A V-belt designated as B 4430 LP has

A. 4430 mm as diameter of small pulley

B. 4430 mm as nominal pitch length

C. 4430 mm as diameter of large pulley

D. 4430 mm as centre distance between pulleys

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4

If a load W is applied instantaneously on a bar; Then the stress induced in bar will

A. Be independent of ratio of mass of load W to mass of bar (y)

B. Increase with increase in y

C. Decrease with decrease in y

D. Depend on other considerations

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4

Which of the following has threads at both ends?

A. Bolt

B. Tap bolt

C. Stud

D. None of these

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4

When the belt speed increases

A. Power transmitted increases

B. Power transmitted decreases

C. Power transmitted increases to a maximum value and then decreases

D. Power transmitted remains the same

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4

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

A. Initial tension

B. External load applied

C. Sum of the initial tension and external load applied

D. Initial tension or external load, whichever is greater

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4

In V-belt drive, belt touches

A. At bottom

B. At sides only

C. Both at bottom and sides

D. Could touch anywhere

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4

Creep in belt is due to

A. Material of the belt

B. Material of the pulley

C. Uneven extensions and contractions due to varying tension

D. All of the above

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4

The value of stress concentration factor depends upon

A. Material and geometry of the part

B. Geometry of the part

C. Material of the part

D. None of these

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4

The included angle between the sides of V-belt is

A. 40°

B. 45°

C. 38°

D. 60°

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4

For hardening alloy steels and high speed steels, they are heated to

A. 1100 to 1300°C

B. 1300 to 1500°C

C. 500 to 600°C

D. 700 to 900°C