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4

In testing a material for endurance strength, it is subjected to

A. Static load

B. Dynamic load

C. Impact load

D. Completely reversed load

Correct Answer :

D. Completely reversed load


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

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 sliding bearing which operates without any lubricant present, is called

A. Zero film bearing

B. Boundary lubricated bearing

C. Hydrodynamic lubricated bearing

D. Hydrostatic lubricated bearing

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4

The shock absorbing capacity of a bolt may be increased by

A. Increasing its shank diameter

B. Decreasing its shank diameter

C. Tightening the bolt properly

D. Making the shank diameter equal to core diameter of thread

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4

Oldham coupling is used to connect two shafts

A. Which are perfectly aligned

B. Which are not in exact alignment

C. Which have lateral misalignment

D. Whose axes intersect at a small angle

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4

The bending stress in a curved beam is

A. Zero at the centroidal axis

B. Zero at the point other than centroidal axis

C. Maximum at the neutral axis

D. None of these

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4

The size of a cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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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

The objective of crowning of the flat pulleys of belt drive is to

A. Prevent the belt from running off the pulley

B. Increase the power transmission capacity

C. Increase the belt velocity

D. Prevent the belt joint from damaging the belt surface

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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

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 resilience of a bolt may be increased by

A. Increasing its shank diameter

B. Increasing its length

C. Decreasing its shank diameter

D. Decreasing its length

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4

During hot working of metals,

A. Porosity of the metal is largely eliminated

B. Grain structure of the metal is refined

C. Mechanical properties are improved due of refinement of grains

D. All of the above

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4

Basic shaft 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

When a hole of diameter d is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

A. d.t.τu

B. πd.t.τu

C. π/4 × d².τu

D. π/4 × d² × t.τu

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4

In thrust bearings, the load acts

A. Along the axis of rotation

B. Parallel to the axis of rotation

C. Perpendicular to the axis of rotation

D. In any direction

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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

18/8 steel contains

A. 18% nickel and 8% chromium

B. 18% chromium and 8% nickel

C. 18% nickel and 8% vanadium

D. 18% vanadium and 8% nickel

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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

A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

A. 2000 N-m

B. 2050 N-m

C. 2100 N-m

D. 2136 N-m

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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

An open belt drive is used when

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

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

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

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

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4

Residual stress in materials

A. Acts when external load is applied

B. Becomes zero when external load is removed

C. Is independent of external loads

D. Is always harmful

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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 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 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

The bearings of heavy series have capacity ________ over the medium series.

A. 20 to 30%

B. 10 to 20%

C. 30 to 40%

D. 40 to 50%

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4

A double strap butt joint (with equal straps) is

A. Always in single shear

B. Always in double shear

C. Either in single shear or double shear

D. Any one 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 taper on key is given on

A. Bottom side only

B. Top side only

C. On both sides

D. Any side