Question
71
Apa fungsi utama camshaft?
What is the main function of the camshaft?
Options
a
Mengatur pembukaan dan penutupan katup sesuai timing mesin
To regulate the opening and closing of valves according to engine timing
b
Mengatur tekanan kerja purifier
To regulate purifier working pressure
c
Menghubungkan piston ke poros baling-baling
To connect the piston to the propeller shaft
d
Mengalirkan air laut ke cooler
To circulate seawater to the cooler
Grade
Ungraded
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Question
72
Camshaft pada mesin diesel umumnya digerakkan oleh?
The camshaft in a diesel engine is generally driven by what?
Options
a
Roda gigi atau rantai timing dari poros engkol
Timing gears or a chain from the crankshaft
b
Sabuk kain dari flywheel
A fabric belt from the flywheel
c
Tekanan udara dari start air receiver
Air pressure from the start air receiver
d
Aliran minyak lumas dari sump tank
Lubricating oil flow from the sump tank
Grade
Ungraded
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Question
73
Pada mesin empat langkah, hubungan putaran camshaft terhadap crankshaft adalah?
In a four-stroke engine, what is the rotational relationship between the camshaft and crankshaft?
Options
a
Camshaft berputar setengah putaran crankshaft
The camshaft rotates at half the speed of the crankshaft
b
Camshaft berputar dua kali putaran crankshaft
The camshaft rotates twice the speed of the crankshaft
c
Camshaft dan crankshaft selalu sama putarannya
The camshaft and crankshaft always rotate at the same speed
d
Camshaft tidak berhubungan dengan crankshaft
The camshaft has no relationship with the crankshaft
Grade
Ungraded
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Question
74
Apa tujuan penyetelan celah katup?
What is the purpose of valve clearance adjustment?
Options
a
Menjamin katup dapat menutup rapat saat mesin mencapai temperatur kerja
To ensure the valves can close tightly when the engine reaches operating temperature
b
Meningkatkan tekanan bahan bakar ke injektor
To increase fuel pressure to the injectors
c
Menambah viskositas minyak lumas
To increase lubricating oil viscosity
d
Menurunkan temperatur udara bilas
To reduce scavenging air temperature
Grade
Ungraded
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Question
75
Apa akibat celah katup terlalu kecil?
What is the effect of valve clearance being too small?
Options
a
Katup dapat tidak menutup rapat saat panas sehingga kompresi bocor
The valve may not close tightly when hot, causing compression leakage
b
Waktu buka katup menjadi selalu lebih lama tanpa dampak lain
Valve opening duration always becomes longer without any other effect
c
Minyak lumas di sump tank langsung habis
Lubricating oil in the sump tank runs out immediately
d
Turbocharger berhenti berputar mendadak
The turbocharger suddenly stops rotating
Grade
Ungraded
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Question
76
Apa akibat timing injeksi terlalu awal?
What is the effect of injection timing being too advanced?
Options
a
Tekanan pembakaran puncak dapat naik terlalu cepat dan mesin terdengar keras
Peak combustion pressure may rise too quickly and the engine sounds harsh
b
Bahan bakar tidak pernah terbakar di dalam silinder
Fuel will never burn inside the cylinder
c
Katup buang selalu terbuka selama kompresi
The exhaust valve remains open throughout compression
d
Tekanan udara start turun ke nol
Starting air pressure drops to zero
Grade
Ungraded
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Question
77
Apa fungsi fuel injection pump?
What is the function of the fuel injection pump?
Options
a
Memberikan bahan bakar bertekanan tinggi ke injektor pada waktu yang tepat
To deliver fuel at high pressure to the injector at the correct time
b
Menyimpan bahan bakar harian untuk mesin induk
To store daily fuel for the main engine
c
Menyaring udara masuk ke turbocharger
To filter intake air to the turbocharger
d
Mendinginkan kepala piston dengan air tawar
To cool the piston with fresh water
Grade
Ungraded
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Question
78
Mengapa pipa bahan bakar tekanan tinggi harus kuat dan presisi?
Why must the high-pressure fuel pipe be strong and precise?
Options
a
Karena harus menahan tekanan injeksi tinggi tanpa deformasi berarti
Because it must withstand high injection pressure without significant deformation
b
Karena berfungsi sebagai penukar panas utama
Because it serves as the main heat exchanger
c
Karena menampung sludge hasil pemurnian
Because it stores sludge from purification
d
Karena digunakan untuk saluran udara start
Because it is used for starting air lines
Grade
Ungraded
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Question
79
Apa manfaat penggunaan aftercooler setelah turbocharger?
What is the benefit of using an aftercooler after the turbocharger?
Options
a
Menaikkan kerapatan udara masuk sehingga pembakaran lebih baik
To increase intake air density so combustion improves
b
Menaikkan temperatur udara masuk agar bahan bakar cepat menguap
To increase intake air temperature so fuel evaporates faster
c
Mengurangi kebutuhan pelumasan turbocharger
To reduce turbocharger lubrication requirements
d
Menggantikan fungsi separator bahan bakar
To replace the function of the fuel separator
Grade
Ungraded
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Question
80
Apa fungsi udara bilas pada mesin dua langkah?
What is the function of scavenging air in a two-stroke engine?
Options
a
Mendorong gas buang keluar dan mengisi silinder dengan udara segar
To push out exhaust gases and fill the cylinder with fresh air
b
Mendinginkan service tank bahan bakar
To cool the fuel service tank
c
Menaikkan tekanan minyak lumas di bantalan
To increase lubricating oil pressure in the bearings
d
Menjalankan purifier tanpa motor listrik
To operate the purifier without an electric motor
Grade
Ungraded
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