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4

The ratio of endurance limit in shear to the endurance limit in flexure is

A. 0.70

B. 0.25

C. 0.40

D. 0.55

Correct Answer :

D. 0.55


Related Questions

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4

In a full journal bearing, the angle of contact of the bearing with the journal is

A. 120°

B. 180°

C. 270°

D. 360°

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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

Basic hole is one

A. Whose upper deviation is zero

B. Whose lower deviation is zero

C. Whose lower as well as upper deviations are zero

D. Does not exist

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4

Which of the following material has the maximum ductility?

A. Copper

B. Mild steel

C. Aluminium

D. Zinc

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4

A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

A. Angular bevel gears

B. Mitre gears

C. Crown Bevel gears

D. Internal bevel gears

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4

For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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4

Which of the following statement is correct, for two shafts connected in parallel?

A. Torque in each shaft is the same

B. Shear stress in each shaft is the same

C. Angle of twist of each shaft is the same

D. Torsional stiffness of each shaft is the same

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4

A fast and loose pulley drive is used when

A. Shafts are arranged parallel and rotate in the opposite directions

B. Shafts are arranged parallel and rotate in the same directions

C. Shafts are arranged at right angles and rotate in one definite direction

D. Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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4

Slenderness ratio is the ratio of

A. Effective length of column to least radius of gyration of the column

B. Width of column to depth of column

C. Maximum size of column to minimum size of column

D. Effective length of column to width of column

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4

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

A. Less than

B. Equal to

C. More than

D. None of these

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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

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

A. (WD/ πd3) × K

B. (2WD/ πd3) × K

C. (4WD/ πd3) × K

D. (8WD/ πd3) × K

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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

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

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

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

C. Resists fracture due to high impact loads

D. Retain deformation produced under load permanently

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4

Auto frettage is the method of

A. Joining thick cylinders

B. Calculating stresses in thick cylinders

C. Pre-stressing thick cylinders

D. Increasing the life of thick cylinders

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4

The ratio of endurance limit in shear to the endurance limit in flexure is

A. 0.33

B. 0.4

C. 0.5

D. 0.55

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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

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

Rankine Gordon formula for buckling is valid for

A. Long column

B. Short column

C. Short and long column

D. Very long column

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4

A backing ring is used inside the pipe joint when making a

A. Butt weld

B. Fillet weld

C. Sleeve weld

D. Socket weld

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4

Which is positive drive?

A. Flat belt drive

B. V-belt drive

C. Crossed belt drive

D. Timing belt

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4

The velocity factor for ordinary cut gears operating at velocities upto 12.5 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 material generally used for aircraft components is

A. Mild steel

B. High speed steel

C. Stainless steel

D. Aluminium

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4

A hollow saddle key is

A. A taper key which fits half in the key way of hub and half in the key way of shaft

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

C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

D. Provided in pairs at right angles and each key is to withstand torsion in one direction only

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4

The form factor of a helical gear __________ with the increase in the helix angle.

A. Increases

B. Decreases

C. Remains constant

D. None of these

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4

According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

A. 0.5 mm upto rivet diameter of 24 mm

B. 1 mm for rivet diameter from 27 mm to 36 mm

C. 2 mm for rivet diameter from 39 mm to 48 mm

D. All of the above

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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

In a marine flange coupling, the thickness of flange is taken as

A. d/2

B. d/3

C. 3d/4

D. d/4

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4

Which process will increase the fatigue duration of parts?

A. Finishing and polishing

B. Shotpeening

C. De-carburisation

D. Electroplating

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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