In a screw jack, the effort required to lift the load is given by(where W = Load lifted, Î± = Helix angle, and Ï† = Angle of friction.)

Mechanical Engineering : Engineering Mechanics - Quiz(MCQ)

P = W cos (Î± + Ï†)

P = W tan (Î± - Ï†)

P = W tan (Î± + Ï†)

P = W tan (Ï† - Î±)

Correct Answer : Option (C) : P = W tan (Î± + Ï†)

Recently Updated in Engineering Mechanics Questions

The coefficient of restitution for elastic bodies is one.

Correct

Incorrect

Both (A) and (B)

Neither (A) nor (B)

Correct Answer : Incorrect

Explanation : Coefficient of restitution for elastic bodies is 0 - 1.

Coefficient of restitution for perfect elastic bodies is 1.

Which of the following type of screws is used in the machines?

Round-threaded

Helical-threaded

Square-threaded

Rectangle-threaded

Correct Answer : Square-threaded

Explanation : In the machines, square threaded screws are employed. Because screws are commonly employed as fasteners. The fundamental benefit of screws is that the friction aids in the structure’s retention. Screws also aid in the fast and efficient joining of the structure.

The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.

Agree

Disagree

Both (A) and (B)

None of the above

Correct Answer : Agree