Question
3111
Pompa sirkulasi dalam proses bunker berfungsi untuk…
An undercharge of refrigerant in the system is often indicated by…
Options
a
Memompa bahan bakar yang sudah dipanaskan ke sistem
Low suction pressure and poor cooling.
b
Mengendapkan bahan bakar lebih lanjut
Very high discharge pressure and sharply increased motor current.
c
Mencampurkan udara ke dalam bahan bakar
The condenser full of liquid and the room becoming too cold.
d
Menghilangkan tekanan dalam sistem bahan bakar
Compressor oil increasing continuously during operation.
Grade
Ungraded
Last Update
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Question
3112
Pompa injeksi (injection pump) atau bosch pump berfungsi untuk…
An overcharge of refrigerant may cause…
Options
a
Menekan bahan bakar dengan tekanan tinggi ke dalam injector
Condensing pressure to be high and compressor load to increase.
b
Menurunkan tekanan bahan bakar sebelum pembakaran
Suction pressure always to fall into vacuum under all conditions.
c
Mendinginkan bahan bakar sebelum digunakan
The evaporator to receive no refrigerant at all.
d
Mengalirkan bahan bakar langsung ke ruang bakar
The Low Pressure Cut Out to trip because the room is too hot.
Grade
Ungraded
Last Update
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Question
3113
Injector dalam proses bahan bakar berperan dalam…
If the expansion valve opening is too small, the symptom appearing at the evaporator is…
Options
a
Mengabutkan bahan bakar agar mudah terbakar
Insufficient refrigerant supply causing reduced cooling.
b
Menyaring udara dari bahan bakar
The evaporator floods with liquid and the compressor slugs.
c
Memanaskan bahan bakar hingga suhu 200°C
Condensing pressure falls to zero.
d
Mencampur bahan bakar dengan pelumas mesin
The liquid receiver overflows with seawater.
Grade
Ungraded
Last Update
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Question
3114
Tangki harian (service tank) memiliki fungsi untuk…
A refrigeration system with insufficient airflow across the evaporator will experience…
Options
a
Menyimpan bahan bakar yang sudah dipanaskan sebelum digunakan oleh mesin
Poor heat transfer and difficulty in reducing room temperature.
b
Mencampur bahan bakar dengan oli sebelum pembakaran
Discharge pressure immediately dropping to zero.
c
Menyaring udara sebelum masuk ke bahan bakar
The condenser becoming excessively cold.
d
Menurunkan suhu bahan bakar sebelum dipakai
The refrigerant charge increasing automatically.
Grade
Ungraded
Last Update
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Question
3115
Hasil akhir dari injector adalah…
A cold room door that is frequently opened will cause…
Options
a
Pengabutan bahan bakar agar mudah terbakar di ruang pembakaran
The heat load to increase and the compressor to run longer.
b
Pencampuran bahan bakar dengan air untuk meningkatkan efisiensi
Compressor oil pressure to keep rising without other effects.
c
Pengurangan kadar sulfur dalam bahan bakar
The liquid receiver to lose its storage function.
d
Pengendapan bahan bakar sebelum masuk ke ruang bakar
The expansion valve to remain tightly closed.
Grade
Ungraded
Last Update
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Question
3116
Marine Diesel Oil (MDO) sering digunakan dalam mesin diesel kapal karena…
When carrying out repair work on a refrigeration system, an important step before charging refrigerant is to…
Options
a
Memiliki viskositas yang lebih rendah dan cocok untuk mesin bertenaga besar
Vacuum the system to remove air and moisture.
b
Memerlukan pemanasan sebelum digunakan dalam mesin
Heat the liquid receiver to maximum pressure.
c
Menghasilkan lebih banyak emisi dibandingkan HFO
Introduce seawater into the compressor suction line.
d
Tidak cocok untuk mesin diesel besar
Open all safety valves so that the system is at atmospheric pressure.
Grade
Ungraded
Last Update
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Question
3117
Heavy Fuel Oil (HFO) memiliki karakteristik…
The main purpose of vacuuming a refrigeration system is to…
Options
a
Viskositas tinggi dan memerlukan pemanasan sebelum digunakan
Remove air and moisture from the part of the system that has been opened.
b
Digunakan pada mesin yang beroperasi di daerah dengan regulasi emisi ketat
Raise high-side pressure before starting the compressor.
c
Mengandung sulfur lebih rendah dibandingkan MGO
Test the direction of rotation of the evaporator motor.
d
Tidak memerlukan pemanasan sebelum digunakan
Increase the cooling capacity of the provision room.
Grade
Ungraded
Last Update
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Question
3118
Marine Gas Oil (MGO) lebih unggul dibandingkan MDO dan HFO karena…
After the system has been vacuumed and has passed the leak test, initial refrigerant charging should be carried out…
Options
a
Memiliki kandungan sulfur yang lebih rendah
In accordance with the manufacturer’s procedure and the type of refrigerant used.
b
Memiliki viskositas lebih tinggi dari HFO
By mixing all types of refrigerant so that cooling becomes faster.
c
Lebih murah dibandingkan HFO
Until the receiver is completely full without checking pressure.
d
Hanya digunakan untuk mesin kecil
By opening both the high side and low side fully at once without supervision.
Grade
Ungraded
Last Update
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Question
3119
Liquefied Natural Gas (LNG) semakin populer sebagai bahan bakar kapal karena…
A safe way to detect a refrigerant leak is to…
Options
a
Menghasilkan emisi lebih rendah daripada bahan bakar fosil lainnya
Use a leak detector or soap solution on the suspected point.
b
Memiliki viskositas tinggi dan sulit untuk digunakan
Use an open flame on all joints.
c
Mengandung lebih banyak sulfur dibandingkan MDO
Raise pressure above the compressor working limit.
d
Tidak memerlukan infrastruktur khusus untuk penyimpanan
Cool the whole system until ice forms.
Grade
Ungraded
Last Update
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Question
3120
Biodiesel dibuat dari…
When a refrigerant leak is found in an enclosed space, the correct initial action is to…
Options
a
Minyak kelapa sawit, kedelai, atau lemak hewan
Increase ventilation and isolate the leak source if it is safe to do so.
b
Gas alam yang dicairkan
Switch off all lighting and then wait for pressure to rise.
c
Campuran HFO dan MDO
Add refrigerant so that pressure returns to normal.
d
Hasil destilasi minyak bumi
Close all ventilation openings so that refrigerant cannot escape.
Grade
Ungraded
Last Update
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