Machine Design - Mechanical Engineering Questions and Answers

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Two closely coiled helical springs with stiffnesses k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

\(\frac { k_1 k_2} {k_1 + k_2 }\)

\(\frac { k_1 - k_2} {k_1 + k_2 }\)

\(\frac { k_1 + k_2} {k_1 k_2 }\)

\(\frac { k_1 - k_2} {k_1 k_2 }\)

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The period during which the cam follower remains at rest, when cam moves, is known as

constant period

fixed period

dwell period

idle period

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The flank of the tooth is the

surface of the top of the tooth

surface of the tooth above the pitch surface

surface of the tooth below the pitch surface

width of the tooth measured along the pitch circle

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The included angle for the British Association thread is

29°

47.3°

55°

60°