7.1 Definieer die volgende terme in verband met 'n binnebrandjin:
7.1.1 Remdrywing
7.1.2 Wrinkrag
7.2 Die aangeduidde drywingsdiagram verteenwoordig die kragslag en kompressieslag - NSC Mechanical Technology Automotive - Question 7 - 2021 - Paper 1
Question 7
7.1 Definieer die volgende terme in verband met 'n binnebrandjin:
7.1.1 Remdrywing
7.1.2 Wrinkrag
7.2 Die aangeduidde drywingsdiagram verteenwoordig die kragslag ... show full transcript
Worked Solution & Example Answer:7.1 Definieer die volgende terme in verband met 'n binnebrandjin:
7.1.1 Remdrywing
7.1.2 Wrinkrag
7.2 Die aangeduidde drywingsdiagram verteenwoordig die kragslag en kompressieslag - NSC Mechanical Technology Automotive - Question 7 - 2021 - Paper 1
Step 1
7.1.1 Remdrywing
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Remdrywing is die bruikbare drywing of eintlike drywing wat by die vliegwiel of drywiel ontwikkel word.
Step 2
7.1.2 Wrinkrag
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Wrinkrag is die ineenraairkag op 'n as of wiel.
Step 3
7.2 Die aangeduidde drywingsdiagram verteenwoordig die kragslag en kompressieslag.
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Die kompressieslag verlaag die volume in die silinder, wat die druk verhoog, terwyl die kragslag die druk in die silinder verbeter.
Step 4
7.3.1 Watter term word gebruik om die volume V1 te beskryf?
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Vryvolume.
Step 5
7.3.2 Watter term word gebruik om die volume V2 te beskryf?
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Slagvolume.
Step 6
7.3.3 Bereken die totale silindervolume in cm³.
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Die totale silindervolume is
Vtotal=V1+V2=39extcm3+330extml=39+330=369extcm3.
Step 7
7.3.4 Bereken die boordiameter in mm.
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Gebruik die formule:
D = ext{sqrt} rac{4 imes S}{ ext{π} imes L},
met S = 330 ext{ cm}^3 ext{ en } L = 6.5 ext{ cm}. ightarrowD=80.4extmm.
Step 8
7.3.5 Bereken die kompressieverhouding van hierdie silinder.
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Die kompressieverhouding kan bereken word as:
KV = rac{Totale ext{ silindervolume}}{Vry ext{ volume}} = rac{369}{39} = 9.46:1.
Step 9
7.4 Noem TWEE metodes om die kompressieverhouding in 'n binnebranding te verlaag.
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Pas dikker paksels tussen silinderblok en silinderkop toe.
Pas suiers met gesplete lede kroon toe.
Step 10
7.5.1 Wrinkrag
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Die wrinkrag kan bereken word deur:
BP = rac{2 imes n imes T}{60}.
Hierdie inligting gee:
T = rac{BP}{2 imes R}.
Step 11
7.5.2 Aangeduide drywing in kW
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Die aangeduide drywing kan bereken word deur:
LimesA=Volume.
Step 12
7.5.3 Meganiese doeltreffendheid.
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Die meganiese doeltreffendheid kan gekalkuleer word deur:
η = rac{RD}{AD} imes 100.
