Question
1221
Apa yang terjadi selama langkah kompresi pada mesin diesel?
What happens during the compression stroke in a diesel engine?
Options
a
Tekanan dan temperatur udara naik sementara volumenya turun
Air pressure and temperature rise while its volume decreases
b
Tekanan udara turun sementara volumenya naik
Air pressure decreases while its volume increases
c
Volume udara tetap sementara tekanan turun
Air volume remains constant while pressure decreases
d
Temperatur udara turun karena ekspansi
Air temperature decreases due to expansion
Grade
Ungraded
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Question
1222
Apa fungsi utama penambahan panas pada Siklus Diesel?
What is the main function of heat addition in the Diesel cycle?
Options
a
Menaikkan energi gas kerja sehingga dapat menghasilkan usaha saat ekspansi
To increase the energy of the working gas so it can produce work during expansion
b
Menurunkan tekanan kompresi agar mesin ringan berputar
To reduce compression pressure so the engine turns more easily
c
Mendinginkan ruang bakar sebelum langkah usaha
To cool the combustion chamber before the power stroke
d
Mengurangi kebutuhan udara bilas di dalam silinder
To reduce the need for scavenging air inside the cylinder
Grade
Ungraded
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Question
1223
Setelah pembakaran pada tekanan tetap dalam Siklus Diesel, tahap berikutnya adalah?
After constant-pressure combustion in the Diesel cycle, what is the next stage?
Options
a
Ekspansi adiabatik
Adiabatic expansion
b
Kompresi isotermal
Isothermal compression
c
Pembuangan gas secara langsung
Direct exhaust discharge
d
Hisap udara baru ke silinder
Fresh air intake into the cylinder
Grade
Ungraded
Last Update
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Question
1224
Apa yang terjadi selama proses ekspansi adiabatik?
What happens during the adiabatic expansion process?
Options
a
Tekanan menurun dan volume bertambah sehingga piston terdorong
Pressure decreases and volume increases, pushing the piston
b
Tekanan meningkat dan volume menurun secara bersamaan
Pressure increases and volume decreases simultaneously
c
Temperatur tetap dan volume tidak berubah
Temperature remains constant and volume does not change
d
Gas buang langsung keluar melalui katup masuk
Exhaust gas immediately exits through the inlet valve
Grade
Ungraded
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Question
1225
Bahan bakar yang umum digunakan pada mesin diesel laut adalah?
What fuel is commonly used in marine diesel engines?
Options
a
Minyak diesel atau marine diesel oil
Diesel oil or marine diesel oil
b
Bensin beroktan tinggi
High-octane gasoline
c
Etanol murni
Pure ethanol
d
Minyak tanah penerbangan
Aviation kerosene
Grade
Ungraded
Last Update
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Question
1226
Mengapa mesin diesel memiliki efisiensi termal yang relatif tinggi?
Why do diesel engines have relatively high thermal efficiency?
Options
a
Karena bekerja dengan rasio kompresi yang tinggi
Because they operate with a high compression ratio
b
Karena menggunakan busi pada setiap siklus kerja
Because they use spark plugs in every working cycle
c
Karena campuran bahan bakar dan udara selalu homogen
Because the fuel-air mixture is always homogeneous
d
Karena pembakaran berlangsung pada temperatur sangat rendah
Because combustion takes place at a very low temperature
Grade
Ungraded
Last Update
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Question
1227
Keuntungan utama mesin diesel untuk kapal adalah?
What is the main advantage of a diesel engine for ships?
Options
a
Torsi besar dan efisiensi bahan bakar yang baik
High torque and good fuel efficiency
b
Putaran sangat tinggi dengan konstruksi ringan
Very high speed with lightweight construction
c
Tidak memerlukan sistem pelumasan
No need for a lubrication system
d
Dapat bekerja tanpa sistem pendingin
Can operate without a cooling system
Grade
Ungraded
Last Update
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Question
1228
Bagaimana gas buang dikeluarkan dari silinder pada mesin diesel?
How are exhaust gases discharged from the cylinder in a diesel engine?
Options
a
Melalui katup buang setelah langkah usaha atau ekspansi
Through the exhaust valve after the power or expansion stroke
b
Melalui injektor saat akhir kompresi
Through the injector at the end of compression
c
Melalui katup masuk saat langkah hisap
Through the inlet valve during the suction stroke
d
Melalui saluran minyak lumas di crankcase
Through the lubricating oil passage in the crankcase
Grade
Ungraded
Last Update
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Question
1229
Apa fungsi utama tangki harian bahan bakar pada kapal?
What is the main function of the daily fuel tank on board?
Options
a
Menyediakan suplai bahan bakar siap pakai ke mesin secara kontinu
To provide a continuous ready-to-use fuel supply to the engine
b
Menampung air got dari ruang mesin
To store bilge water from the engine room
c
Mencampur minyak lumas dengan bahan bakar
To mix lubricating oil with fuel
d
Mendinginkan bahan bakar sebelum masuk settling tank
To cool the fuel before it enters the settling tank
Grade
Ungraded
Last Update
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Question
1230
Komponen mana yang menyemprotkan bahan bakar ke ruang bakar?
Which component sprays fuel into the combustion chamber?
Options
a
Injektor
Injector
b
Alternator
Alternator
c
Thermostat
Thermostat
d
Flywheel
Flywheel
Grade
Ungraded
Last Update
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