21) When one of the links of a kinematic chain is fixed, the chain is known as a

Answer is:

Mechanism

Theory of Machines MCQ with Answers

22) The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as

Answer is:

Inversion

23) Which of the following statement is correct as regard to the difference between a machine and a structure ?

The parts of a machine more relative to one another, whereas the members of a structure do not move relative to one another

The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work

All of the above

Answer is:

All of the above

Explanation:

Following are the difference between a machine and a structure
* The parts of a machine more relative to one another, whereas the members of a structure do not move relative to one another
* The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
* A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work