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COMPRESSION RATIO
c
l Vl
Vt=Vl +Vc
Vc
D
Vt
TMA
TMB
𝐂𝐑 =
Vl + Vc
Vc
𝐂𝐑 =
Vt
Vc
𝐕 = πr2
. t
1.Diketahui:
D = 8 cm
tl = 11 cm
tc = 1.2 cm
CR = ?
D = 8cm …… .r = 4 cm
Vc = 3,14 𝑥 42
𝑥 1.2 = 60,288
Vl = 3,14 𝑥42
𝑥 11 = 552,64
CR =
552,64 + 60,288
60,288
=
612,928
60,288
= 10.66
CR = 10.66:1
𝐕𝐜 =
Vl
CR − 1
𝐕𝐥 = Vc x(CR − 1)
Vl = Volume langkah
Vc = Volume compressi
t = tinggi
CR = Perbandingan kompresi
2. Diketahui:
D = 50 mm
tl = 56,6 mm
CR = 9:1
Vl = ?
Vc= ?
D = 50 mm …… . r = 2,5 cm
Vl = 3,14 𝑥 2,52
𝑥 5,66 = 109,1 cm3
Vc =
Vl
CR − 1
Vc =
109,1
9 − 1
=
109,1
8
= 13,64 cm3
Pembuktian:
CR =
Vl + Vc
Vc
=
109,1 + 13,64
13,64
= 8,99
𝐶𝑅 = 9 ∶ 1
3. Diketahui:
Vc = 20 cc
CR = 11:1
Vl = ?
CR =
Vl + Vc
Vc
Vl = Vc x (CR − 1) = 20 x (11− 1)
Vl = 200 cc
Pembuktian:
CR =
Vl + Vc
Vc
=
200 + 20
20
= 11
CR = 11 ∶ 1

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COMPRESSION RATIO/PERBANDINGAN KOMPRESSI

  • 1. COMPRESSION RATIO c l Vl Vt=Vl +Vc Vc D Vt TMA TMB 𝐂𝐑 = Vl + Vc Vc 𝐂𝐑 = Vt Vc 𝐕 = πr2 . t 1.Diketahui: D = 8 cm tl = 11 cm tc = 1.2 cm CR = ? D = 8cm …… .r = 4 cm Vc = 3,14 𝑥 42 𝑥 1.2 = 60,288 Vl = 3,14 𝑥42 𝑥 11 = 552,64 CR = 552,64 + 60,288 60,288 = 612,928 60,288 = 10.66 CR = 10.66:1 𝐕𝐜 = Vl CR − 1 𝐕𝐥 = Vc x(CR − 1) Vl = Volume langkah Vc = Volume compressi t = tinggi CR = Perbandingan kompresi
  • 2. 2. Diketahui: D = 50 mm tl = 56,6 mm CR = 9:1 Vl = ? Vc= ? D = 50 mm …… . r = 2,5 cm Vl = 3,14 𝑥 2,52 𝑥 5,66 = 109,1 cm3 Vc = Vl CR − 1 Vc = 109,1 9 − 1 = 109,1 8 = 13,64 cm3 Pembuktian: CR = Vl + Vc Vc = 109,1 + 13,64 13,64 = 8,99 𝐶𝑅 = 9 ∶ 1
  • 3. 3. Diketahui: Vc = 20 cc CR = 11:1 Vl = ? CR = Vl + Vc Vc Vl = Vc x (CR − 1) = 20 x (11− 1) Vl = 200 cc Pembuktian: CR = Vl + Vc Vc = 200 + 20 20 = 11 CR = 11 ∶ 1