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4

A localised compressive stress at the area of contact between two members is known as

A. Tensile stress

B. Bending stress

C. Bearing stress

D. Shear stress

Correct Answer :

C. Bearing stress


Related Questions

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4

A key capable of tilting in a recess milled out in a shaft is known as

A. Woodruff key

B. Feather key

C. Flat saddle key

D. Hollow saddle key

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4

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A. Knuckle threads

B. Square threads

C. Acme threads

D. Buttress threads

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4

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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4

For general industrial machinery, the ratio of the length of journal to its diameter is taken as

A. 0.5 to 1

B. 1 to 2

C. 3 to 5

D. 5 to 10

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4

When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

A. d.t.τu

B. πd.t.τu

C. π/4 × d².τu

D. π/4 × d² × t.τu

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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 creep in the belt is due to

A. Effect of temperature on belt

B. Material of belt

C. Unequal extensions in the belt due to tight and slack side tensions

D. Stresses beyond elastic limit of belt material

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4

Machine screws are

A. Similar to small size tap bolts except that a greater variety of shapes of heads are available

B. Slotted for a screw driver and generally used with a nut

C. Used to prevent relative motion between two parts

D. Similar to stud

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4

In static loading, stress concentration is more serious in

A. Brittle materials

B. Ductile materials

C. Brittle as well as ductile materials

D. Elastic materials

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4

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

A. Decreasing the cross-section area of bar

B. Increasing the cross-section area of bar

C. Remain unaffected with cross-section area

D. Would depend upon other factors

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4

The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

A. Repeated stress

B. Yield stress

C. Fluctuating stress

D. Alternating stress

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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

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4

Oil in journal bearing should be applied at the point where load is

A. Nil or lightest

B. Maximum

C. Average

D. Any one of the above

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4

In cross or regular lay 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 maximum normal stress theory is used for

A. Plastic materials

B. Brittle materials

C. Non-ferrous materials

D. Ductile materials

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4

The cold working of metals is carried out __________ the recrystallisation temperature.

A. Above

B. Below

C. At

D. None of these

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4

Screws used for power transmission should have

A. Very fine threads

B. High efficiency

C. Low efficiency

D. Strong teeth

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4

The power transmitted by belt drive depends upon

A. Belt velocity

B. Initial belt tension

C. Arc of contact

D. All of the above

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4

The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

A. It is subjected to a higher cyclic loading than the outer side

B. It is subjected to a higher stress than the outer side

C. It is more stretched than the outer side during the manufacturing process

D. It has a lower curvature than the outer side

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4

A feather key is generally

A. Loose in shaft and tight in hub

B. Tight in shaft and loose in hub

C. Tight in both shaft and hub

D. Loose in both shaft and hub

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4

Rankine's theory of failure is applicable for following type of materials

A. Brittle

B. Ductile

C. Elastic

D. Plastic

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4

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

A. 1420 d

B. 1680 d

C. 2080 d

D. 2840 d

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4

The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

A. Gerber relation

B. Soderberg relation

C. Goodman relation

D. None of these

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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 strength of a riveted joint is equal to

A. Tearing strength of plate (Pt)

B. Shearing strength of rivet (Ps)

C. Crushing strength of rivet (Pc)

D. Least value of Pt Ps and Pc

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4

Which of the following statement is correct?

A. A parallel sunk key is a taperless key

B. A parallel sunk key may be rectangular or square in cross-section

C. A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft

D. All of the above

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4

The stress in the threaded part of the bolt will be __________ as compared to the shank.

A. Same

B. Higher

C. Lower

D. None of these

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4

When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a

A. Short bearing

B. Long bearing

C. Medium bearing

D. Square bearing

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4

Stress concentration is caused due to

A. Variations in load acting on a member

B. Variations in properties of materials in a member

C. Abrupt change of cross-section

D. All of these

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4

In unilateral system of tolerance, the tolerance is allowed on

A. Both sides of the actual size

B. One side of the actual size

C. One side of the nominal size

D. Both sides of the nominal size