Question
21
Apa fungsi sea water cooler atau central cooler?
What is the function of a seawater cooler or central cooler?
Options
a
Membuang panas dari air tawar pendingin ke air laut
To remove heat from the fresh cooling water to seawater
b
Menambah kadar garam pada air tawar pendingin
To increase salt content in the fresh water
c
Memisahkan minyak lumas dari air pendingin
To separate lubricating oil from cooling water
d
Menyuplai udara bilas ke silinder
To supply scavenging air to the cylinder
Grade
Ungraded
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Question
22
Mengapa banyak mesin kapal memakai sistem pendingin sirkuit tertutup?
Why do many marine engines use a closed cooling system?
Options
a
Karena mengurangi korosi dan pengendapan pada bagian dalam mesin
Because it reduces corrosion and deposits inside the engine
b
Karena air laut lebih mahal daripada air tawar
Because seawater is more expensive than fresh water
c
Karena tidak memerlukan pompa sama sekali
Because it does not require a pump at all
d
Karena temperatur kerja mesin menjadi selalu rendah
Because engine operating temperature always becomes low
Grade
Ungraded
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Question
23
Salah satu tanda overheating pada mesin adalah?
What is one indication of engine overheating?
Options
a
Temperatur pendingin naik di atas batas normal dan tenaga mesin cenderung turun
Coolant temperature rises above normal and engine power tends to decrease
b
Tekanan kompresi naik tanpa perubahan temperatur
Compression pressure rises without any temperature change
c
Warna bahan bakar di service tank menjadi lebih gelap
Fuel color in the service tank becomes darker
d
Putaran turbocharger turun saat mesin berhenti
Turbocharger speed decreases when the engine stops
Grade
Ungraded
Last Update
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Question
24
Apa fungsi expansion tank dalam sistem pendingin?
What is the function of the expansion tank in the cooling system?
Options
a
Menampung pemuaian cairan pendingin dan membantu pembuangan udara dari sistem
To accommodate coolant expansion and help remove air from the system
b
Menaikkan tekanan bahan bakar ke injektor
To increase fuel pressure to the injector
c
Mengumpulkan sludge dari purifier
To collect sludge from the purifier
d
Menyimpan air bilga sebelum dibuang
To store fresh expansion water for the bilge system
Grade
Ungraded
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Question
25
Apa akibat overcooling pada mesin diesel?
What is the effect of overcooling on a diesel engine?
Options
a
Pembakaran kurang baik dan keausan dapat meningkat karena temperatur kerja terlalu rendah
Poor combustion and increased wear because operating temperature is too low
b
Tekanan oli selalu menjadi terlalu tinggi tanpa sebab lain
Oil pressure always becomes too high without another cause
c
Turbocharger berputar lebih cepat dari batas aman
The turbocharger rotates faster than the safe limit
d
Katup buang menjadi tertutup terus-menerus
The exhaust valve remains closed continuously
Grade
Ungraded
Last Update
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Question
26
Siapa yang dikenal sebagai penemu mesin diesel?
Who is known as the inventor of the diesel engine?
Options
a
Rudolf Diesel
Rudolf Diesel
b
James Watt
James Watt
c
Nikola Tesla
Nikola Tesla
d
Henry Ford
Henry Ford
Grade
Ungraded
Last Update
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Question
27
Di bagian mana energi panas hasil pembakaran diubah menjadi tekanan kerja utama?
In which part is heat energy from combustion converted into the main working pressure?
Options
a
Di dalam silinder
In the cylinder
b
Di dalam alternator
In the alternator
c
Di dalam purifier
In the purifier
d
Di dalam air cooler
In the air cooler
Grade
Ungraded
Last Update
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Question
28
Apa fungsi utama turbocharger?
What is the main function of the turbocharger?
Options
a
Memampatkan udara masuk dengan memanfaatkan energi gas buang
To compress intake air by using exhaust gas energy
b
Mendinginkan minyak lumas sebelum masuk mesin
To cool lubricating oil before it enters the engine
c
Menggerakkan pompa bahan bakar secara mekanis
To drive the fuel pump mechanically
d
Mengurangi tekanan kompresi silinder
To reduce cylinder compression pressure
Grade
Ungraded
Last Update
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Question
29
Bagaimana mesin diesel menghasilkan tenaga?
How does a diesel engine produce power?
Options
a
Melalui pembakaran bahan bakar di dalam silinder yang mendorong piston
Through fuel combustion inside the cylinder that pushes the piston
b
Melalui pemanasan air laut menjadi uap di crankcase
By heating seawater into steam inside the crankcase
c
Melalui gaya magnet pada poros engkol
Through magnetic force on the crankshaft
d
Melalui kompresi udara di luar silinder tanpa pembakaran
Through air compression outside the cylinder without combustion
Grade
Ungraded
Last Update
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Question
30
Apa yang dimaksud dengan rasio kompresi?
What is meant by the compression ratio?
Options
a
Perbandingan volume silinder saat piston di titik mati bawah terhadap titik mati atas
The ratio of cylinder volume when the piston is at bottom dead center to top dead center
b
Perbandingan jumlah bahan bakar terhadap minyak lumas
The ratio of fuel quantity to lubricating oil
c
Perbandingan tekanan udara bilas terhadap tekanan atmosfer
The ratio of scavenging air pressure to atmospheric pressure
d
Perbandingan diameter silinder terhadap langkah piston
The ratio of cylinder diameter to piston stroke
Grade
Ungraded
Last Update
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