MACHINE DESIGN QUIZ

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially upwards

None of these

Axially upwards or downwards

Axially downwards

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In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key depth

Decrease the key length

Increase the key width

Increase the key length

TRUE ANSWER : ?
YOUR ANSWER : ?

The gears are termed as medium velocity gears, if their peripheral velocity is

30-50 m/s

15-30 m/s

3-15 m/s

1-3 m/s

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YOUR ANSWER : ?

The draw of cotter need not exceed

3 mm

20 mm

5 mm

10 mm

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In case of pressure vessels having open ends, the fluid pressure induces

None of these

Shear stress

Circumferential stress

Longitudinal stress

TRUE ANSWER : ?
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All stresses produced in a belt are

Compressive stresses

Both tensile and compressive stresses

Shear stresses

Tensile stresses

TRUE ANSWER : ?
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Brittle coating technique is used for

Determining brittleness

Experimental stress analysis

Protecting metal against wear and tear

Protecting metal against corrosion

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Which of the following welded joint is designed for shear strength?

Parallel fillet welded joint

Transverse fillet welded joint

Butt welded joint

All of these

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A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ

2 τ

τ/2

τ

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Resilience of a material is important, when it is subjected to

Fatigue

Thermal stresses

Shock loading

Combined loading

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