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4

When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

A. 4F/ πd²

B. 6F/ πd²

C. 8F/ πd²

D. 16F/ 3πd²

Correct Answer :

D. 16F/ 3πd²


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 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

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

A. Elastic strength

B. Yield strength

C. Shear strength

D. None of these

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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

In designing thick cylinders, the equation used is

A. Lame's equation

B. Birnie's equation

C. Clavarinos' equation

D. All of these

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4

The bearings of medium series have capacity __________ over the light series.

A. 10 to 20 %

B. 20 to 30 %

C. 30 to 40 %

D. 40 to 50 %

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4

The suitable material for belt in agricultural machinery is

A. Leather

B. Rubber

C. Cotton duck

D. Balata gum

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4

The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24

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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

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

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

A. One-fourth

B. One-third

C. One-half

D. Double

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4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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4

The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

A. ½

B. 1

C. 2

D. 4

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4

Which of the following cotter joint will be used to connect strap end of a connecting rod?

A. Spigot and socket cotter joint

B. Sleeve and cotter joint

C. Gib and cotter joint

D. Any one of these

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4

The ball bearings are, usually, made from

A. Low carbon steel

B. High carbon steel

C. Medium carbon steel

D. High speed steel

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4

The included angle for the V-belt is usually

A. 10°-20°

B. 30°-40°

C. 40°-60°

D. 60°-80°

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4

The standard length of the shaft is

A. 6 m

B. 5 m

C. 7 m

D. All of these

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4

The maximum efficiency of a square threaded screw is

A. (1 - sinφ)/ (1 + sinφ)

B. (1 + sinφ)/ (1 - sinφ)

C. (1 - sinφ)/ (1 + cosφ)

D. (1 + cosφ)/ (1 - sinφ)

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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

Antifriction bearings are

A. Sleeve bearings

B. Hydrodynamic bearings

C. Thin lubricated bearings

D. None of the above

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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

The designation M 33 × 2 of a bolt means

A. Metric threads of 33 numbers in 2 cm

B. Metric threads with cross-section of 33 mm

C. Metric threads of 33 mm outside diameter and 2 mm pitch

D. Bolt of 33 mm nominal diameter having 2 threads per cm

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4

The objective of caulking in a riveted joint is to make the joint

A. Free from corrosion

B. Stronger in tension

C. Free from stress

D. Leak-proof

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4

Which one of the following is a positive drive?

A. V-belt drive

B. Rope drive

C. Crossed flat belt drive

D. Chain drive

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4

Rankine's theory is used for

A. Brittle materials

B. Ductile materials

C. Elastic materials

D. Plastic materials

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4

The included angle for the British Association thread is

A. 29°

B. 55°

C. 47.3°

D. 60°

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4

Belt slip may occur due to

A. Heavy load

B. Loose belt

C. Driving pulley too small

D. All of the above

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4

In designing a key, it is assumed that the distribution of forces along the length of key

A. Varies linearly

B. Is uniform throughout

C. Varies exponentially, being more at the torque-input end

D. Varies exponentially, being less at the torque-input end

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4

A tube has the following advantage over pipe

A. Lighter and easier to handle

B. Greater shock absorption

C. Smoother inside walls

D. All of the above

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4

Which of the following statement is wrong for a connecting rod?

A. The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy

B. If Ixx > 4 Iyy, the buckling will occur about Y-axis

C. If Ixx < 4 Iyy, the buckling will occur about X-axis

D. The most suitable section for the connecting rod is T-section