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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)

Correct Answer :

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


Related Questions

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4

Spring stiffness is

A. Ratio of coil diameter to wire diameter

B. Load required to produce unit deflection

C. Its capability of storing energy

D. Its ability to absorb shocks

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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

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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

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

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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

Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

A. 2

B. 4

C. 8

D. 16

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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

When the connected members are very yielding (soft gasket) as compared to the bolt, 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

The stress in the threaded part of the bolt will be __________ as compared to the shank.

A. Same

B. Higher

C. Lower

D. None of these

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4

In order to obtain bolt of uniform strength

A. Increase shank diameter

B. Increase its length

C. Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

D. Tighten die bolt properly

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4

Crushing resistance required to crush the rivet per pitch length is

A. p.d.σc

B. p.t.σc

C. n.d.t.σc

D. (p - d) t.σc

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4

In a flange coupling, the flanges are coupled together by means of

A. Bolts and nuts

B. Studs

C. Headless taper bolts

D. None of these

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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

A single strap butt joint is always in __________ shear.

A. Single

B. Double

C. Triple share

D. None of these

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4

A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

A. 1 kN-m

B. 2 kN-m

C. 3 kN-m

D. 4 kN-m

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4

A transmission shaft includes

A. Over head shaft

B. Counter shaft

C. Line shaft

D. All of these

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4

Stress concentration is caused due to

A. Variations in load acting on a member

B. Variations in properties of materials in a member

C. Abrupt change of cross-section

D. All of these

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4

An alien bolt is

A. Self locking bolt

B. Same as stud

C. Provided with hexagonal depression in head

D. Used in high speed components

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4

Plastic flow in ductile materials

A. Increases the seriousness of static loading stress concentration

B. Lessens the seriousness of static loading stress concentration

C. Has no effect on it

D. Depends on other considerations

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4

If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

A. Increases

B. Decreases

C. Remains unchanged

D. None of these

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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

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

If a spring is cut down into two springs, the stiffness of cut springs will be

A. Half

B. Same

C. Double

D. None of the above

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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 material generally used for aircraft components is

A. Mild steel

B. High speed steel

C. Stainless steel

D. Aluminium

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4

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to

A. P1 - P2

B. P1 + P2

C. 2 × (P1 + P2)

D. [2 × (P1 + P2)] + Pc Where Pc is centrifugal tension

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4

In a horizontal flat belt drive, it is customary to use

A. Bottom side of belt as slack side

B. Top side of belt as slack side

C. Idler pulley

D. None of the above

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4

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

A. Angular bevel gears

B. Mitre gears

C. Internal bevel gears

D. Crown bevel gears

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4

Eye bolts are used for

A. Foundation purposes

B. Absorbing shock and vibrations

C. Transmission of power

D. Lifting and transportation of machines and cubicles

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4

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

A. ZN/p

B. p/ZN

C. Z/pN

D. N/Zp