Question
51
Apa fungsi pompa air laut dalam sistem pendingin mesin?
What is the function of the seawater pump in the engine cooling system?
Options
a
Mensuplai air laut ke berbagai cooler sebagai media pembuang panas
To supply seawater to various coolers as the heat rejection medium
b
Mensuplai air laut langsung ke dalam silinder
To supply seawater directly into the cylinder
c
Mensuplai air tawar ke header tank
To supply fresh water to the header tank
d
Mensuplai bahan bakar ke settling tank
To supply fuel to the settling tank
Grade
Easy
Last Update
04 Aug 2026 13:32
By Gabriel
Question
52
Apa fungsi thermostat pada sistem jacket cooling water?
What is the function of the thermostat in the jacket cooling water system?
Options
a
Mengatur aliran pendingin agar temperatur mesin tetap stabil
To regulate coolant flow so that engine temperature remains stable
b
Mengatur tekanan udara start di manifold
To regulate starting air pressure in the manifold
c
Mengatur debit bahan bakar ke injector
To regulate fuel delivery to the injector
d
Mengatur salinitas air laut pendingin
To regulate the salinity of cooling seawater
Grade
Easy
Last Update
04 Aug 2026 13:33
By Gabriel
Question
53
Mengapa header tank dipasang lebih tinggi daripada mesin induk?
Why is the header tank installed higher than the main engine?
Options
a
Agar tersedia tekanan statis, ruang ekspansi, dan pemisahan udara dari sistem
To provide static pressure, expansion space, and air separation from the system
b
Agar air laut dapat masuk sendiri ke silinder
So that seawater can enter the cylinder by itself
c
Agar bahan bakar dapat dipindahkan tanpa pompa
So that fuel can be transferred without a pump
d
Agar minyak lumas tidak kembali ke sump tank
So that lubricating oil does not return to the sump tank
Grade
Medium
Last Update
04 Aug 2026 13:33
By Gabriel
Question
54
Apa akibat jika temperatur jacket cooling water terlalu rendah?
What is the effect if the jacket cooling water temperature is too low?
Options
a
Pembakaran menjadi kurang sempurna dan keausan dingin dapat meningkat
Combustion becomes incomplete and cold corrosion may increase
b
Turbocharger berputar terlalu cepat
The turbocharger rotates too fast
c
Tekanan udara start turun mendadak
Starting air pressure drops suddenly
d
Kapasitas purifier bertambah besar
Purifier capacity increases
Grade
Medium
Last Update
05 Aug 2026 11:07
By Gabriel
Question
55
Apa akibat jika temperatur jacket cooling water terlalu tinggi?
What is the effect if the jacket cooling water temperature is too high?
Options
a
Mesin dapat mengalami overheating dan kemampuan pelumasan menurun
The engine may overheat and lubricating performance decreases
b
Kompresor udara start bekerja lebih ringan
The starting air compressor works more lightly
c
Kadar air dalam bahan bakar hilang seluruhnya
All water content in the fuel disappears
d
Putaran governor otomatis berhenti
The governor speed automatically stops
Grade
Medium
Last Update
05 Aug 2026 11:12
By Gabriel
Question
56
Apa fungsi ventilasi udara pada titik tertinggi sistem pendingin air tawar?
What is the function of the air vent at the highest point of the fresh water cooling system?
Options
a
Membuang udara terperangkap agar sirkulasi pendingin tetap lancar
To release trapped air so that coolant circulation remains smooth
b
Menambah tekanan bahan bakar ke injector
To increase fuel pressure to the injector
c
Mendinginkan gas buang sebelum turbocharger
To cool exhaust gas before the turbocharger
d
Memisahkan lumpur dari air laut
To separate sludge from seawater
Grade
Easy
Last Update
05 Aug 2026 11:13
By Gabriel
Question
57
Mengapa pendinginan piston perlu dipantau dengan cermat?
Why must piston cooling be monitored carefully?
Options
a
Karena kegagalan pendinginan piston dapat menyebabkan overheat dan kerusakan serius
Because piston cooling failure can cause overheating and serious damage
b
Karena pendinginan piston menentukan arah putaran mesin
Because piston cooling determines the direction of rotation
c
Karena pendinginan piston mempengaruhi kerja kompas giro
Because piston cooling affects the operation of the gyro compass
d
Karena pendinginan piston hanya diperlukan saat kapal sandar
Because piston cooling is only needed when the ship is berthed
Grade
Easy
Last Update
05 Aug 2026 11:13
By Gabriel
Question
58
Apa fungsi utama minyak lumas pada mesin diesel kapal?
What is the main function of lubricating oil in a marine diesel engine?
Options
a
Mengurangi gesekan dan keausan antar permukaan yang bergerak
To reduce friction and wear between moving surfaces
b
Menaikkan kadar oksigen di ruang bakar
To increase oxygen content in the combustion space
c
Menambah tekanan udara start
To increase starting air pressure
d
Menggantikan fungsi air pendingin
To replace the function of cooling water
Grade
Easy
Last Update
05 Aug 2026 11:16
By Gabriel
Question
59
Apa fungsi lube oil cooler?
What is the function of the lube oil cooler?
Options
a
Menurunkan temperatur minyak lumas agar viskositas dan daya lumas terjaga
To reduce lubricating oil temperature so that viscosity and lubricating ability are maintained
b
Memanaskan minyak lumas sebelum masuk bearing
To heat lubricating oil before it enters the bearing
c
Membuang air dari bahan bakar berat
To remove water from heavy fuel oil
d
Menaikkan tekanan di crankcase
To increase pressure in the crankcase
Grade
Easy
Last Update
05 Aug 2026 11:17
By Gabriel
Question
60
Apa fungsi purifier minyak lumas?
What is the function of the lubricating oil purifier?
Options
a
Memisahkan air dan kotoran dari minyak lumas
To separate water and impurities from the lubricating oil
b
Mencampur minyak lumas dengan bahan bakar
To mix lubricating oil with fuel
c
Menaikkan tekanan minyak lumas ke turbocharger
To increase lubricating oil pressure to the turbocharger
d
Mendinginkan minyak lumas dengan udara
To cool lubricating oil with air
Grade
Easy
Last Update
05 Aug 2026 11:17
By Gabriel