Question
31
Urutan langkah pada mesin diesel empat langkah adalah?
What is the sequence of strokes in a four-stroke diesel engine?
Options
a
Hisap, kompresi, usaha, buang
Suction, compression, power, exhaust
b
Kompresi, usaha, hisap, buang
Compression, power, suction, exhaust
c
Hisap, usaha, kompresi, buang
Suction, power, compression, exhaust
d
Buang, hisap, usaha, kompresi
Exhaust, suction, power, compression
Grade
Ungraded
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Question
32
Apa yang dimaksud dengan injektor?
What is meant by an injector?
Options
a
Komponen yang mengabutkan bahan bakar ke ruang bakar pada tekanan tertentu
A component that atomizes fuel into the combustion chamber at a certain pressure
b
Komponen yang mendinginkan piston dengan air tawar
A component that cools the piston with fresh water
c
Komponen yang membuang gas buang ke cerobong
A component that discharges exhaust gas to the funnel
d
Komponen yang mengatur putaran poros baling-baling
A component that regulates propeller shaft speed
Grade
Ungraded
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Question
33
Mengapa mesin diesel banyak digunakan sebagai penggerak kapal?
Why are diesel engines widely used as ship propulsion engines?
Options
a
Karena kuat, efisien, dan mampu menghasilkan torsi besar pada beban berat
Because they are robust, efficient, and able to produce high torque under heavy load
b
Karena tidak membutuhkan sistem pendingin dan pelumasan
Because they do not require cooling and lubrication systems
c
Karena dapat memakai bensin tanpa perubahan sistem
Because they can use gasoline without system modification
d
Karena lebih ringan daripada motor listrik pada semua ukuran
Because they are lighter than electric motors in all sizes
Grade
Ungraded
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Question
34
Perawatan rutin yang penting untuk mesin diesel adalah?
What routine maintenance is important for a diesel engine?
Options
a
Penggantian minyak lumas, filter, dan pemeriksaan sistem bahan bakar serta pendingin
Changing lubricating oil and filters, and checking the fuel and cooling systems
b
Menambah air laut ke dalam minyak lumas secara berkala
Adding seawater into the lubricating oil regularly
c
Mengoperasikan mesin terus-menerus tanpa inspeksi
Operating the engine continuously without inspection
d
Mengganti poros engkol setiap jadwal jaga
Replacing the crankshaft every watch schedule
Grade
Ungraded
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Question
35
Salah satu penyebab pembakaran tidak sempurna adalah?
What is one cause of incomplete combustion?
Options
a
Pengabutan bahan bakar yang buruk dari injektor
Poor fuel atomization from the injector
b
Temperatur air laut di luar kapal terlalu rendah
The seawater temperature outside the ship is too low
c
Tinggi gelombang di sekitar kapal berubah
The wave height around the ship changes
d
Warna cat mesin memudar karena panas
The engine paint color fades due to heat
Grade
Ungraded
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Question
36
Apa tujuan utama sistem pelumasan pada mesin kapal?
What is the main purpose of the lubrication system in a marine engine?
Options
a
Mengurangi gesekan dan keausan antarbagian yang bergerak
To reduce friction and wear between moving parts
b
Menaikkan tekanan udara bilas di manifold
To increase scavenging air pressure in the manifold
c
Menyuplai bahan bakar ke pompa injeksi
To supply fuel to the injection pump
d
Mendinginkan air laut sebelum masuk cooler
To cool seawater before it enters the cooler
Grade
Ungraded
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Question
37
Bahan yang digunakan dalam sistem pelumasan adalah?
What material is used in the lubrication system?
Options
a
Minyak pelumas
Lubricating oil
b
Air tawar
Fresh water
c
Bahan bakar ringan
Light fuel oil
d
Udara bertekanan
Compressed air
Grade
Ungraded
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Question
38
Komponen yang mengedarkan minyak pelumas ke seluruh sistem adalah?
Which component circulates lubricating oil throughout the system?
Options
a
Pompa minyak pelumas
Lubricating oil pump
b
Pompa bilga
Bilge pump
c
Pompa ballast
Ballast pump
d
Pompa air laut
Fresh water pump
Grade
Ungraded
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Question
39
Apa fungsi utama filter minyak pelumas?
What is the main function of the lubricating oil filter?
Options
a
Menyaring kotoran agar tidak ikut bersirkulasi ke bantalan dan komponen lain
To remove dirt so it does not circulate to bearings and other components
b
Menaikkan viskositas minyak lumas
To increase lubricating oil viscosity
c
Mendinginkan minyak lumas dengan udara luar
To cool lubricating oil with outside air
d
Menambah kandungan aditif secara otomatis
To add additives automatically
Grade
Ungraded
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Question
40
Jika tekanan minyak pelumas turun di bawah normal saat mesin bekerja, tindakan awal yang benar adalah?
If lubricating oil pressure drops below normal while the engine is running, what is the correct initial action?
Options
a
Kurangi beban mesin dan periksa level oli, filter, pompa, serta kebocoran
Reduce engine load and check oil level, filter, pump, and leaks
b
Tambahkan air tawar ke tangki oli
Add fresh water into the oil tank
c
Naikkan putaran mesin agar tekanan kembali normal
Increase engine speed so the pressure returns to normal
d
Tutup pendingin minyak lumas seluruhnya
Completely close the lubricating oil cooler
e
Apa fungsi relief valve atau bypass valve pada sistem pelumasan?
What is the function of the relief valve or bypass valve in the lubrication system?
Grade
Ungraded
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