MACHINE DESIGN QUIZ

Surface endurance limit of gear material is dependent upon its

Toughness

Elastic strength

Yield strength

Brinell hardness number

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The ball bearings are provided with a cage

To reduce friction

To maintain the balls at a fixed distance apart

To prevent the lubricant from flowing out

To facilitate slipping of balls

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If threads on a bolt are left hand, threads on nut will be

Right hand with fine pitch

Right hand with same pitch

Could be left or right hand

Left hand with same pitch

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The wear load should be __________ the dynamic load.

Equal to

Less than

Greater than

None of these

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A key capable of tilting in a recess milled out in a shaft is known as

Feather key

Flat saddle key

Hollow saddle key

Woodruff key

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The groove angle of the pulley for rope drive is usually

45°

20°

60°

35°

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The resistance to fatigue of a material is measured by

Young's modulus

Endurance limit

Elastic limit

Ultimate tensile strength

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Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

2W/3

W/2

W/9

8W/9

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A flange coupling is used to connect two shafts

Which are not in exact alignment

Have lateral misalignment

Which are perfectly aligned

Whose axes intersect at a small angle

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In the levers of first type, the mechanical advantage is ________ one.

Less than

None of these

More than

Equal to

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