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4

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A. Thread

B. Middle

C. Shank

D. Head

Correct Answer :

A. Thread


Related Questions

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4

When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

A. 10 times

B. 5 times

C. 15 times

D. 20 times

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4

When the bolt is very yielding as compared to the connected members, 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

Fibrous fracture occurs in

A. Ductile material

B. Brittle material

C. Elastic material

D. Hard material

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4

In designing a connecting rod, it is considered like __________ for buckling about Y-axis.

A. Both ends hinged

B. Both ends fixed

C. One end fixed and the other end hinged

D. One end fixed and the other end free

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4

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

A. Bending stress

B. Shear stress

C. Tensile stress

D. Bearing stress

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4

According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

A. 45 to 60 %

B. 63 to 70 %

C. 70 to 83 %

D. 80 to 90 %

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4

The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A. Heavier

B. Lighter

C. Moderate

D. None of these

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4

The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

A. 0.75/ (0.75 + √v)

B. 3/ (3 + v)

C. 4.5/ (4.5 + v)

D. 6/ (6 + v)

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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

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4

A screw is said to be a self locking screw, if its efficiency is

A. Less than 50 %

B. More than 50 %

C. Equal to 50 %

D. None of these

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4

The shear plane in case of bolts should

A. Be across threaded portion of shank

B. Be parallel to axis of bolt

C. Be normal to threaded portion of shank

D. Never be across the threaded portion

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4

For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

A. 4

B. 6

C. 8

D. 10

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4

In case of pressure vessels having closed ends, the fluid pressure induces

A. Longitudinal stress

B. Shear stress

C. Circumferential stress

D. None of these

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4

The draw of cotter need not exceed

A. 3 mm

B. 5 mm

C. 10 mm

D. 20 mm

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4

In leaf springs, the longest leaf is known as

A. Master leaf

B. Lower leaf

C. Upper leaf

D. None of these

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4

The temperature at which the new grains are formed in the metal is known as

A. Lower critical temperature

B. Upper critical temperature

C. Recrystallisation temperature

D. None of these

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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

In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

A. Equal to

B. Twice

C. Three times

D. Four times

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4

Buttress threads are usually found on

A. Screw cutting lathes

B. Feed mechanisms

C. Spindles of bench vices

D. Railway carriage couplings

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4

The arms of the pulleys for flat belt drive have

A. Elliptical cross-section

B. Major axis in plane of rotation

C. Major axis twice the minor axis

D. All the three characteristics

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4

In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

A. Normal pitch

B. Axial pitch

C. Diametral pitch

D. Module

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4

In nitrated parts, the origins of the fatigue cracks will occur at

A. Surface

B. Just below the surface

C. Within the core

D. None of the above

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4

In radial bearings, the load acts __________ to the axis of rotation.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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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

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

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

The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

A. 2/8

B. 8/2

C. 4/8

D. 8/4

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4

In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

A. The effect of curvature of the cylinder wall is neglected

B. The tensile stresses are uniformly distributed over the section of the walls

C. The effect of the restraining action of the heads at the end of the pressure vessel is neglected

D. All of the above

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4

The metal suitable for bearings subjected to heavy loads is

A. White metal

B. Silicon bronze

C. Monel metal

D. Phosphor bronze

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4

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

A. Equal to

B. sinα times more than

C. sinα times less than

D. cosecα times more than