What is the primary function of a power screw in machinery?

To convert rotary motion into linear motion for power transmission.

Riddle: I can lift loads with ease, my threads can be square or trapezoidal. What am I?

A power screw.

True or False: The efficiency of square threads is lower than that of trapezoidal threads.

False. Square threads have the highest efficiency compared to other thread forms.

The included angle for Acme threads is ______.

29 degrees.

Which type of thread is typically used in applications where loss of motion cannot be tolerated?

Acme or trapezoidal threads.

What is the main disadvantage of square threads compared to trapezoidal threads?

Square threads are more difficult to manufacture and more expensive.

In a power screw, if the axial load is denoted by F, the torque required to lower the load is given by ______.

P - μN cos α + N sin α = 0.

MCQ: Which of the following threads can transmit power only in one direction? A) Square B) Acme C) Buttress D) Trapezoidal

C) Buttress.

What condition indicates that a power screw is self-locking?

If μπdₘ < />

Fill in the blank: The core diameter of a screw is denoted as ______.

Dₖ.

What is the formula for the compressive stress in a power screw?

Σₐ = F/A, where A is the cross-sectional area.

True or False: Trapezoidal threads are preferred due to their high friction characteristics.

False. Trapezoidal threads are often used due to ease of machining, despite higher friction.

Riddle: I can carry heavy loads and consist of threads that can be square or trapezoidal, but I must be designed for smooth operation. What am I?

A power screw.

What is the relationship between the number of starts (n) and the developed length (L) in a multi-start power screw?

L = n × p, where p is the pitch.

Short Answer: What is the purpose of using a factor of safety in screw design?

To ensure that the screw can handle unexpected loads and prevent failure.