Question

MCQ (100)
014, in simple screw jack, with(L) as the length
of the effort wheel and (p) as pitch of the
screw, its velocity ratio is
(A) 2nd/o
(6) d/20
( 2mp/
(D) Tp/21​

Answer 1

Answer:

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Answer 2

Answer:

in simple screw jack, with(L) as the length

of the effort wheel and (p) as the pitch of the

screw, its velocity ratio is

1. 2$\pi$L/p
2. 2$\pi$p/L
3. 2$\pi$pL
4. 2$\pi$/pL

OPTION (1) is correct. (2$\pi$L/p)

Explanation:

A screw jack is used to raise a heavy load via way of means of making use of smaller attempts. It includes a screw, outfitted in a nut, which bureaucracy the frame of the jack, and a screw head to which taken care of is attached. The load is saved at the screw head and an attempt is carried out via way of means of taking care. The screw jack works at the identical precept on which a willing aircraft works.

In one revolution of the take care of, screw turned around via way of means of one revolution. Then load raised is identical to the pitch of the screw.

W = Load to be lifted

P = Effort required to lift the load at the end of the handle

L = Length of the handle

p = Pitch of the screw

In one revolution of the screw,

Distance moved by the effort = 2πL

Distance moved by the load = p

∴ Velocity Ratio (V.R) = Distance moved by the effort/Distance moved by the load = 2πL/p

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