Question
11
Apa yang terjadi pada langkah usaha mesin diesel 4 langkah?
What happens during the power stroke of a 4-stroke diesel engine?
Options
a
Pembakaran menghasilkan tenaga dan mendorong piston dari TMA ke TMB
Combustion produces power and pushes the piston from TDC to BDC
b
Udara masuk ke silinder saat piston bergerak dari TMB ke TMA
Air enters the cylinder as the piston moves from BDC to TDC
c
Gas buang keluar saat piston bergerak dari TMA ke TMB
Exhaust gas leaves as the piston moves from TDC to BDC
d
Bahan bakar dipindahkan dari settling tank ke service tank
Fuel is transferred from the settling tank to the service tank
Grade
Easy
Last Update
04 Aug 2026 12:25
By Gabriel
Question
12
Kapan katup buang terbuka pada mesin diesel 4 langkah?
When does the exhaust valve open in a 4-stroke diesel engine?
Options
a
Pada langkah buang saat piston bergerak dari TMB ke TMA
During the exhaust stroke as the piston moves from BDC to TDC
b
Pada awal langkah isap saat piston bergerak dari TMA ke TMB
At the beginning of the intake stroke as the piston moves from TDC to BDC
c
Sepanjang langkah kompresi
Throughout the compression stroke
d
Hanya saat mesin berhenti
Only when the engine stops
Grade
Easy
Last Update
04 Aug 2026 12:25
By Gabriel
Question
13
Setelah langkah buang pada mesin diesel 4 langkah, proses berikutnya adalah apa?
After the exhaust stroke in a 4-stroke diesel engine, what is the next process?
Options
a
Kembali ke langkah isap
Return to the intake stroke
b
Langsung ke langkah usaha
Go directly to the power stroke
c
Langsung ke langkah kompresi
Go directly to the compression stroke
d
Langsung ke langkah pendinginan
Go directly to the cooling stroke
Grade
Easy
Last Update
04 Aug 2026 12:25
By Gabriel
Question
14
Apa perbedaan utama proses pengisian pada mesin diesel 2 langkah dan 4 langkah?
What is the main difference in the charging process between a 2-stroke and a 4-stroke diesel engine?
Options
a
Pada mesin 2 langkah, pengisian dan kompresi berlangsung dalam satu putaran poros engkol, sedangkan pada mesin 4 langkah berlangsung terpisah
In a 2-stroke engine, charging and compression occur within one crankshaft revolution, whereas in a 4-stroke engine they occur separately
b
Pada mesin 2 langkah, tidak ada proses kompresi
In a 2-stroke engine, there is no compression process
c
Pada mesin 4 langkah, udara masuk melalui lubang bilas
In a 4-stroke engine, air enters through scavenge ports
d
Pada mesin 2 langkah, katup hisap selalu terbuka
In a 2-stroke engine, the intake valve is always open
Grade
Easy
Last Update
04 Aug 2026 12:26
By Gabriel
Question
15
Pada mesin diesel 2 langkah, apa yang terjadi saat piston bergerak dari TMB ke TMA?
In a 2-stroke diesel engine, what happens when the piston moves from BDC to TDC?
Options
a
Lubang bilas dan lubang buang terbuka untuk memasukkan udara baru dan mendorong gas buang keluar. Setelah itu, kedua lubang tertutup dan udara dimampatkan.
The scavenge and exhaust ports open to let fresh air enter and push the exhaust gases out. The ports then close, and the air is compressed.
b
Lubang bilas dan lubang buang tertutup saat udara baru masuk, kemudian keduanya terbuka ketika udara dimampatkan.
The scavenge and exhaust ports remain closed while fresh air enters, then both ports open when the air is compressed.
c
Lubang buang terbuka untuk memasukkan udara baru, sedangkan lubang bilas mengeluarkan gas buang dari silinder.
The exhaust port opens to admit fresh air, while the scavenge port removes exhaust gases from the cylinder.
d
Lubang bilas terbuka setelah udara dimampatkan, kemudian lubang buang tertutup untuk memasukkan gas buang ke dalam silinder.
The scavenge port opens after the air is compressed, then the exhaust port closes to admit exhaust gases into the cylinder.
Grade
Easy
Last Update
04 Aug 2026 12:39
By Gabriel
Question
16
Kapan bahan bakar diinjeksikan pada mesin diesel 2 langkah?
When is fuel injected in a 2-stroke diesel engine?
Options
a
Menjelang piston mencapai TMA setelah udara termampatkan
Just before the piston reaches TDC after the air has been compressed
b
Saat piston mulai turun dari TMA
When the piston starts moving down from TDC
c
Ketika lubang bilas mulai terbuka
When the scavenge ports begin to open
d
Pada saat piston berada tepat di TMB
When the piston is exactly at BDC
Grade
Easy
Last Update
04 Aug 2026 12:40
By Gabriel
Question
17
Pada mesin diesel 2 langkah, apa yang terjadi saat piston bergerak dari TMA ke TMB?
In a 2-stroke diesel engine, what happens when the piston moves from TDC to BDC?
Options
a
Terjadi langkah usaha, kemudian lubang buang dan bilas terbuka untuk pembuangan dan pembilasan
The power stroke occurs, then the exhaust and scavenge ports open for exhaust and scavenging
b
Terjadi langkah kompresi dengan kedua katup tertutup
The compression stroke occurs with both valves closed
c
Udara masuk melalui katup hisap dan bahan bakar dibuang
Air enters through the intake valve and fuel is discharged
d
Minyak lumas dipompa ke service tank
Lubricating oil is pumped to the service tank
Grade
Easy
Last Update
04 Aug 2026 12:41
By Gabriel
Question
18
Apa keunggulan utama mesin diesel 2 langkah dibanding mesin diesel 4 langkah?
What is the main advantage of a 2-stroke diesel engine compared to a 4-stroke diesel engine?
Options
a
Menghasilkan langkah usaha pada setiap satu putaran poros engkol
It produces a power stroke in every one crankshaft revolution
b
Memerlukan dua putaran poros engkol untuk setiap langkah usaha
It requires two crankshaft revolutions for every power stroke
c
Menggunakan sistem pengapian busi
It uses a spark ignition system
d
Tidak memerlukan udara bilas
It does not require scavenge air
Grade
Easy
Last Update
04 Aug 2026 12:42
By Gabriel
Question
19
Apa fungsi blower bilas atau turbocharger pada mesin 2 langkah?
What is the function of the scavenge blower or turbocharger in a 2-stroke engine?
Options
a
Menyuplai udara bilas ke silinder agar pembilasan dan pengisian berlangsung baik
To supply scavenge air to the cylinder so that scavenging and charging take place properly
b
Menyuplai bahan bakar bertekanan tinggi ke injector
To supply high-pressure fuel to the injector
c
Mengalirkan minyak lumas ke bantalan utama
To deliver lubricating oil to the main bearings
d
Menurunkan tekanan udara start di manifold
To reduce starting air pressure in the manifold
Grade
Easy
Last Update
04 Aug 2026 12:43
By Gabriel
Question
20
Apa tujuan proses scavenging pada mesin diesel 2 langkah?
What is the purpose of the scavenging process in a 2-stroke diesel engine?
Options
a
Membuang gas sisa pembakaran dan menggantinya dengan udara segar
To remove residual combustion gas and replace it with fresh air
b
Mendinginkan bahan bakar sebelum injeksi
To cool the fuel before injection
c
Mengembunkan uap air di dalam silinder
To condense water vapor inside the cylinder
d
Menaikkan kadar karbon di ruang bakar
To increase the carbon content in the combustion space
Grade
Easy
Last Update
04 Aug 2026 12:43
By Gabriel