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4

When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

A. 0.20

B. 0.35

C. 0.50

D. 0.65

Correct Answer :

C. 0.50


Related Questions

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4

When the belt is transmitting maximum power,

A. The tension in tight side is twice the centrifugal tension

B. The tension in slack side is equal to the centrifugal tension

C. The tension in tight side is thrice the centrifugal tension

D. None of the above

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4

The width of the pulley should be __________ width of the belt.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The tension on the slack side of the belt is __________ the tension on the tight side of the belt.

A. Equal to

B. Less than

C. Greater than

D. None of these

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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

Which of the following screw thread is used for power transmission in one direction only?

A. Square threads

B. Multiple threads

C. Acme threads

D. Buttress threads

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4

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

A. (Kf + 1)/ (Kt + 1)

B. (Kf - 1)/ (Kt - 1)

C. (Kt + 1)/ (Kf + 1)

D. (Kt - 1)/ (Kf - 1)

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4

The angle of twist of shaft is

A. Directly proportional to (shaft diameter)²

B. Inversely proportional to (shaft diameter)²

C. Directly proportional to (shaft diameter)⁴

D. Inversely proportional to (shaft diameter)⁴

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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

The rated life of a bearing varies

A. Directly as load

B. Inversely as square of load

C. Inversely as cube of load

D. Inversely as fourth power of load

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4

The fatigue stress concentration factor is defined as

A. The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

B. The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

C. The product of the endurance limits with and without stress concentration

D. All of the above

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4

For same pulley diameters, center distance, belt speed and belt and pulley materials,

A. Open belt drive transmits more power than crossed belt drive

B. Crossed belt drive transmits more power than open belt drive

C. Open and crossed belt drives transmit same power

D. Power transmission does not depend upon open and crossed types of constructions

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4

When the fulcrum is in between the load and effort, the lever is said to be of

A. First type

B. Second type

C. Third type

D. Any one of these

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4

Pick up wrong statement. Fatigue strength can be increased by

A. Cold working

B. Shot peening

C. Grinding and lapping surface

D. Hot working

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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

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

A. T sec3φ

B. T sec²φ

C. T/sec3φ

D. T cosecφ

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4

The design of the pressure vessel is based on

A. Longitudinal stress

B. Hoop stress

C. Longitudinal and hoop stress

D. None of these

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4

According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

A. Equating tearing resistance of the plate to the shearing resistance of the rivets

B. Equating tearing resistance of the plate to the crushing resistance of the rivets

C. Equating shearing resistance to the crushing resistance of the rivets

D. None of the above

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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

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4

Which of the following spring is used in mechanical wrist watch?

A. Helical compression spring

B. Spiral spring

C. Torsion spring

D. Belleville spring

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4

The square threads are usually found on

A. Spindles of bench vices

B. Railway carriage couplings

C. Feed mechanism of machine tools

D. Screw cutting lathes

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4

According to Indian standard specifications, 100 H6/g5 means that the

A. Basic size is 100 mm

B. Actual size is 100 mm

C. Difference between the actual size and basic size is 100 mm

D. None of the above

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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 difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

A. Working depth

B. Clearance

C. Backlash

D. Face width

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4

The dedendum is the radial distance from the

A. Pitch circle to the top of a tooth

B. Pitch circle to the bottom of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

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4

When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

A. Compression

B. Tension

C. Shear

D. Combined loads

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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

The property of a material which enables it to resist fracture due to high impact loads is known as

A. Elasticity

B. Endurance

C. Strength

D. Toughness

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4

The taper on key is given on

A. Bottom side only

B. Top side only

C. On both sides

D. Any side

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4

The material used for brake lining should have __________ coefficient of friction.

A. Low

B. High

C. Moderate

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