Which of the following specification is generally measured in cubic centimeters for an internal combustion engine

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SSC JE Mechanical 16 Nov 2022 Shift 2 Official Paper
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  1. Swept volume of cylinder
  2. Total volume of cooling water
  3. Volume of exhaust gases
  4. Volume of fuel inside tank

Answer (Detailed Solution Below)

Option 1 : Swept volume of cylinder
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Detailed Solution

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Explanation:

Cylinder block is the important part of the engine, where the reciprocating motion of the piston creates the moving boundary of the combustion system.

The Boundaries are:

F1 M.J Madhu 01.04.20 D4

Top Dead Centre:

It is the centre where Piston is farthest away from the crankshaft. It is denoted by TDC.

Bottom Dead Centre:

It is the dead centre where piston is nearest to the crankshaft. It is denoted by BDC.

Swept Volume:

It is the volume swept by the piston by travelling from one dead centre to another dead centre. It is denoted by Vs

It is generally measured in cubic centimeter.

Swept Volume = Volume of cylinder at BDC (VBDC) - Volume of cylinder at TDC (VTDC)

Clearance volume:

It is the volume of the combustion chamber above the piston when it is a TDC. It is denoted by Vc

Compression Ratio:

It is the ratio of total volume of the cylinder when piston is at the BDC to the clearance volume. It is denoted by r.

\(r = \frac{{{V_{BDC}}}}{{{V_c}}} = \frac{{{V_s} + {V_c}}}{{{V_c}}} = 1 + \frac{{{V_s}}}{{{V_c}}}\)

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