Diploma CET Mechanical Question Paper

6) The ratio of work done per cycle to the stroke volume of the compressor is known as

Answer is:

Mean effective pressure

7) Piston and the cylinder of an I C Engine Constitute

Answer is:

A Sliding Pair

Explanation:

Sliding Pair: When the two elements of a pair are connected in such a way that one can only slide relative to the other, the pair is known as a sliding pair. The piston and cylinder, cross-head and guides of a reciprocating steam engine, ram and its guides in shaper, tailstock on the lathe bed etc. are examples of a sliding pair. A little consideration will show, that a sliding pair has a completely constrained motion.

Piston and the cylinder of an I C Engine Constitute

8) The relation between number of pairs (P) and number of links ( I ) in a Kinematic chain is given by

Answer is:

l=2p-4

9) The Mechanism which consists of two turning pairs and two sliding pairs known as

Answer is:

Elliptical trammel

10) The relative motion between belt and pulley caused by expansion and contraction of belt passing from one side to another is called

Answer is:

Creep

Explanation:

Creep in belt drive : When the belt passes from slack side to tight side, a certain portion of the belt extends and it contracts again when the belt passes from tight sight to slack side. Due to these changes in length, there is a relative motion between the belt and the pulley surfaces.