The position of the piston at the top of a cylinder, where the piston changes its direction of motion from the top to the bottom is_________.

  1. Top Dead Centre (TDC)
  2. Bottom Dead Centre (BDC)
  3. Stroke
  4. Cycle

Answer (Detailed Solution Below)

Option 1 : Top Dead Centre (TDC)
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Basic technical terms used in relation to engines

  • T.D.C. (Top dead centre): It is the position of the piston at the top of a cylinder, where the piston changes its direction of motion from the top to the bottom
  • B.D.C. (Bottom dead centre): It is the position of the piston at the bottom of the cylinder where the piston changes its direction of motion from the bottom to the top
  • Stroke: The distance travelled by the piston from TDC to BDC or BDC to TDC
  • Cycle: A set of operations performed in sequence by the motion of the piston in an engine to produce power
  • Swept volume (VS): Displacement volume of a piston
  • Clearance volume (VC): Volume of the space above the piston when it is at TDC
  • Compression ratio (CR): Ratio of compression volumes before the stroke and after

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