1 2 Which answer best describes the term top dead center as

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Which answer best describes the term \"top dead center\" as used in engineering thermodynamics? A) The volume displaced by the piston as it moves through one stroke length. B) The maximum volume divided by the minimum volume. C) When the piston is in the smallest volume portion of a stroke D) When the piston is in the largest volume portion of a stroke.

Solution

Solution :

1.

The correction solution is When the piston is in the smallest portion of the stroke.

When the piston is at top dead center it creates the smallest volume in the cylinder which is called as the clearance volume which when divided with the total volume we get the compression ratio.

2. The correct option is Both compression and Combustion.

During the compression stroke the piston compresses the air to its ignition temperature and during the combustion cycle the temperature is rised due to the combustion of fuel. As a proof you can also observe the T-S diagram f the diesel cycle.