COMPRESSION RATIO

c

l Vl

Vt=Vl +Vc

Vc

D

Vt

TMA

TMB

CR=Vl+VcVc

CR= VtVc

V=π r2 .t

1. Diketahui:D=8cm

tl = 11 cmtc = 1.2 cmCR = ?

D=8cm…….r=4cm

Vc=3,14 x 42 x1.2=60,288

Vl=3,14 x 42x11=552,64

CR=552,64+60,28860,288

=612,92860,288

=10.66

CR=10.66 :1

Vc= VlCR−1

Vl=Vc x (CR−1)

Vl = Volume langkahVc = Volume compressit = tinggiCR = Perbandingan kompresi

2. Diketahui:D=50mm

tl = 56,6 mmCR = 9:1Vl = ?Vc= ?

D=50mm…….r=2,5cm

Vl=3,14 x 2,52 x 5,66=109,1 c m3

Vc= VlCR−1

Vc=109,19−1

=109,18

=13,64c m3

Pembuktian:CR=Vl+Vc

Vc=109,1+13,64

13,64=8,99

CR=9:1

3. Diketahui:Vc=20cc

CR = 11:1Vl = ?

CR=Vl+VcVc

Vl=Vc x (CR−1 )=20 x (11−1 )

Vl=20 0cc

Pembuktian:CR=Vl+Vc

Vc=200+20

20=11

CR=11:1