Mechanical Engineering - Theory of machines - Discussion

Discussion Forum : Theory of machines - Section 1 (Q.No. 44)

Theory of machines

44.

In a screw jack, the effort required to lower the load W is given by

P = W tan(α - φ)

P = W tan(α + φ)

P = W tan(φ - α)

P = W cos(α + φ)

Answer: Option

Explanation:

No answer description is available. Let's discuss.

Discussion:

12 comments Page 2 of 2.

Ishan said: 10 years ago

@Kishan option C is correct.

It will be Wtan (Phi-alpha) only.

Kishan said: 1 decade ago

It's always p = Wtan(alpha-phi) for lowering the load and plus sign for raising load.

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