Lifting Appliances MCQ with Answers

16) Which one of the following groups of properties enables the manufacture of chain hooks from wrought iron ?

Answer is:

Malleability, ductility and toughness

17) What is NOT an example of a machine ?

Answer is:

Bridge

Explanation:

Bridge is not a machine, it is a structure.
A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is constructed for the purpose of providing passage over the obstacle, usually something that can be detrimental to cross otherwise.

18) A screw thread is a kind of simple machine. It is a shaft with spiral grooves called threads formed on its surface. The closer the threads are, the higher the mechanical advantage. Why ?

Answer is:

The threads increase the distance a force is applied

19) If the mechanical advantage of a simple machine is 4, then the

Answer is:

output force is 4 times the effort

20) A pulley system has 3 section of ropes that lift the load. The mechanical advantage of the system is

Answer is: