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4

Surface endurance limit of gear material is dependent upon its

A. Elastic strength

B. Yield strength

C. Brinell hardness number

D. Toughness

Correct Answer :

C. Brinell hardness number


Related Questions

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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. Crown bevel gears

B. Angular bevel gears

C. Mitre gears

D. Internal bevel gears

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4

Aircraft body is usually fabricated by

A. Welding

B. Pre-casting

C. Riveting

D. Casting

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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

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. None of these

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4

The helix angle for double helical gears may be made up to

A. 45°

B. 60°

C. 75°

D. 90°

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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

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4

Which of the following statement is wrong?

A. A key is used as a temporary fastening

B. A key is subjected to tensile stresses

C. A key is always inserted parallel to the axis of the shaft

D. A key prevents relative motion between the shaft and boss of the pulley

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4

The centre to centre distance between two consecutive rivets in a row, is called

A. Margin

B. Pitch

C. Back pitch

D. Diagonal pitch

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4

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

A. 0.45

B. 0.55

C. 0.65

D. 0.75

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4

The stress induced in the belt is,

A. Tensile stress

B. Compressive stress

C. Direct shear stress

D. Torsional shear stress

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4

Allen bolts are

A. Self locking bolts

B. Designed for shock load

C. Used in aircraft application

D. Provided with hexagonal depression in head

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4

For longitudinal joint in boilers, the type of joint used is

A. Butt joint with single cover plate

B. Butt joint with double cover plate

C. Lap joint with one ring overlapping the other

D. Any one of the above

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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

A universal coupling is used to connect two shafts

A. Which are not in exact alignment

B. Which are perfectly aligned

C. Whose axes intersect at a small angle

D. Have lateral misalignment

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4

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

A. (6V/ π)1/2

B. (6V/ π)1/3

C. (6V/ π)2

D. (6V/ π)3

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4

The smallest diameter of an external or internal screw thread is known as

A. Minor diameter

B. Major diameter

C. Pitch diameter

D. None of these

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4

At low temperatures (say 75°C) the notched bar impact value of steel

A. Increases markedly

B. Decreases markedly

C. Remain same

D. Depends on heat treatment carried out

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4

The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

A. T₁/T₂ = μθ

B. log (T₁/T₂) = μθ

C. T₁/T₂ =eμθ

D. T₁/T₂ = log μθ

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4

In the levers of third type, the mechanical advantage is __________ one.

A. Less than

B. Equal to

C. More than

D. None of these

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4

When a belt drive is transmitting maximum power,

A. Effective tension is equal to centrifugal tension

B. Effective tension is half of centrifugal tension

C. Driving tension on slack side is equal to centrifugal tension

D. Driving tension on tight side is twice the centrifugal tension

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4

The effective stress in wire ropes during normal working is equal to the stress due to

A. Axial load plus stress due to bending

B. Acceleration/retardation of masses plus stress due to bending

C. Axial load plus stress due to acceleration/retardation

D. Bending plus stress due to acceleration/retardation

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4

The helix angle for single helical gears ranges from

A. 10° to 15°

B. 15° to 20°

C. 20° to 35°

D. 35° to 50°

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4

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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4

The process which improves the machinability of steels, but lowers the hardness and tensile strength is

A. Normalising

B. Full annealing

C. Process annealing

D. Spheroidising

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4

A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

A. 1 kN-m

B. 2 kN-m

C. 3 kN-m

D. 4 kN-m

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4

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

A. Right hand

B. Left hand

C. Both A and B

D. None of these

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4

The plasticity is the property of a material which enables it to

A. Regain its original shape after deformation when the external forces are removed

B. Draw into wires by the application of a tensile force

C. Resist fracture due to high impact loads

D. Retain deformation produced under load permanently

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4

Elastic nut is a locking device in which

A. One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw

C. Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

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4

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

The toughness of a material _________ when it is heated

A. Does not change

B. Increases

C. Decreases

D. None of the Above