+1 vote
in Machine Kinematics by (38.0k points)
In a squared and ground helical spring the effective number of turns is increased by

(a) 1

(b) 2

(c) 1.5

(d) 0

This question was addressed to me in an online quiz.

This intriguing question comes from Closely-coiled Helical Spring and Compound Pendulum topic in section Simple Harmonic Motion of Machine Kinematics

1 Answer

0 votes
by (106k points)
Right choice is (b) 2

To elaborate: In a compression spring the ends can be plain, plain and ground, squared, squared and ground. The number of inactive turns in each case are 1.5,1,1 and 2 respectively.

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