-The method used to induce a layer of residual compressive stress on the surface of the spring wire, is (A) shot peening (B) burnishing (C) lapping (D) none of the above

-The method used to induce a layer of residual compressive stress on the surface of the

spring wire, is

(A) shot peening

(B) burnishing

(C) lapping

(D) none of the above
by

1 Answer

Answer :

(A) shot peening
by

Related questions

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength. (A) Lancing (B) Shot peening (C) Slugging (D) Spinning

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Last Answer : (B) Shot peening

When the helical torsion spring is subjected to torque, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress

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Last Answer : (C) Bending stress

When the helical compression spring is subjected to axial compressive force, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress

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When the helical extension spring is subjected to axial tensile force, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress

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Give application of lapping, honing, buffing and burnishing.

Description : Give application of lapping, honing, buffing and burnishing.

Last Answer : Applications of Lapping: Press work dies, Moulding dies, Limit gauges, Surface plates, Engine valve and valve seat, Races of ball and roller bearings, Gears, Piston rings, Slip gauges, ... the surface. Burnishing components are Cam & followers, matting parts of engine, aesthetical components etc.

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________ cannot increase the fatigue strength of a material. (A) Grain refining (B) Grain coarsening (C) Surface hardening (D) Shot peening

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Hard peening is a) Hammering the weld across the length while the joint is hot b) Hammering the weld along the length while the joint is hot c) Hammering the weld along the length while the joint is cold d) Hammering the weld across the length while the joint is cold

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In Mohr's circle method, compressive direct stress is represented on ____ a. positive x-axis b. positive y-axis c. negative x-axis d. negative y-axis

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The spokes of the flywheel are subjected to 1. direct shear stress 2. torsional shear stress 3. tensile stress 4. compressive stress

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Last Answer : (i) Shear stress

Transverse fillet welds are under (i) Shear stress (ii) Compressive stress (iii) Tensile stress

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Last Answer : (iii) Tensile stress

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When a nut is tightened by placing a washer below it, the threads of bolt are subjected to (A) Direct shear stress (B) Torsional shear stress (C) Tensile stress (D) Compressive stress

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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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A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key. a) 70.1 N/mm2 b) 51.6N/mm2 c) 45.5N/mm2 d) None of the listed

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For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

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Torsional shear stresses are induced in the spring wire when (A) spring is under compression (B) spring is under tension (C) both (A) and (B) (D) none of the above

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When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring (B) Wire diameter of each spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring

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The stiffness of spring is, (A) Deflection per unit of axial force (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection

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The load shared by each spring is inversely proportional to the cross section of wire. a) Yes b) No, it is directly proportional c) It is proportional to its square d) It is proportional to its square root

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If number of coils are 8 and wire diameter of spring 3mm, then solid length is given by? a) None of the listed b) 27mm c) 24mm d) 21mm

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If spring index=2.5, what can be concluded about stresses in the wire? a) They are high b) They are negligible c) They are moderate d) Cannot be determined

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The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False

Description : The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False

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The helical spring ad wire of helical torsion spring, both are subjected to torsional shear stresses. a) True b) False

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High endurance limit of carburised machine parts is because of the fact that carburisation (A) Suppresses any stress concentration produced in the parts (B) Enhances the yield point of the material (C) Introduces a compressive layer on the surface (D) Produces a better surface finish

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For a helical torsion sprig, the stress concentration factor at outer fibre is? Give spring index=5. a) 0.78 b) 0.87 c) 1.87 d) 0.69

Description : For a helical torsion sprig, the stress concentration factor at outer fibre is? Give spring index=5. a) 0.78 b) 0.87 c) 1.87 d) 0.69

Last Answer : b) 0.87

For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5. a) 1.005 b) 1.175 c) 1.223 d) 1.545

Description : For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5. a) 1.005 b) 1.175 c) 1.223 d) 1.545

Last Answer : b) 1.175

What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. a) Fatigue Failure b) Fracture c) None of the listed d) Nipping

Description : What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. a) Fatigue Failure b) Fracture c) None of the listed d) Nipping

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The advantage of a welded joint over a riveted joint is (i) Introduce residual stresses (ii) Requires highly skilled labor and supervision (iii) Lighter in weight (iv) None

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Last Answer : (iii) Lighter in weight

A crown casting with a chamfer margin fits the die; but in the mouth the casting is open approximately 0.3mm. A satisfactory fit and accurate physiological close of the gingival area of the crown can BEST be achieved by: A. Hand burnishing B. Mechanical burnishing C. Using finishing burs and points to remove the enamel margins on the tooth D. Making a new impression and remaking the crown E. Relieving the inside of the occlusal surface of the casting to allow for further

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Last Answer : D. Making a new impression and remaking the crown

Propagation of fatigue failure is always due to compressive stresses. a) Due to bending b) Due to tensile c) Due to fatigue d) None of the listed

Description : Propagation of fatigue failure is always due to compressive stresses. a) Due to bending b) Due to tensile c) Due to fatigue d) None of the listed

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Cotter joint is employed when the members are subjected to which sort of stresses? a) Axial tensile b) Axial compressive c) Axial tensile or compressive d) None of the above

Description : Cotter joint is employed when the members are subjected to which sort of stresses? a) Axial tensile b) Axial compressive c) Axial tensile or compressive d) None of the above

Last Answer : c) Axial tensile or compressive

Cotter joints is used for transforming........... A. Axial compressive load B. Axial tensile load C. Axial tensile or compressive load D. Twisting load

Description : Cotter joints is used for transforming........... A. Axial compressive load B. Axial tensile load C. Axial tensile or compressive load D. Twisting load

Last Answer : C. Axial tensile or compressive load

Cotter joints is used for transforming........... A. Axial compressive load B. Axial tensile load C. Axial tensile or compressive load D. Twisting load

Description : Cotter joints is used for transforming........... A. Axial compressive load B. Axial tensile load C. Axial tensile or compressive load D. Twisting load

Last Answer : C. Axial tensile or compressive load

Transverse fillet welds are under (i) Bending and shear stresses (ii)Compressive and torsion shear stresses (iii)Tensile and compressive stresses (iv)None

Description : Transverse fillet welds are under (i) Bending and shear stresses (ii)Compressive and torsion shear stresses (iii)Tensile and compressive stresses (iv)None

Last Answer : (iv)None