Lo2 Flashcards
What is the purpose of the regulation valve?
To reduce pressure of the refrigerant.
what action should be taken in the event of an increase of compressor discharge pressure?
Bleed air at condenser.
What is the cause of a noisy compressor?
High charge in refrigerant.
Maintenance on the air con system is to be carried out to avoid what?
Legionella bacteria.
In a refrigeration system, if the temperature of the sea water to the condenser is very low what will the thermostatic expansion valve allow to happen?
The valve will allow liquid to return to the compressor suction.
What will a correct operating expansion valve have?
Frosting on the outlet side, but not on the inlet side.
Air conditioning and refrigeration systems use refrigerants that are (1) and have a freezing point (2) the normal operating range.
1- Non-toxic
2- Below
What can be a result of moisture in the refrigeration system?
A reduction in pressure at the condenser outlet.
what is in the final de-oiling filter on and oily-water separator?
Coalescing inserts.
What will result in high flow-rates through an oily-water separator?
Oil carry-over to the outlet of the separator.
What may both engine-room emergency bilge pumps and emergency bilge injection systems pump through?
Through the oily-water separator.
What is aeration in a biological sewage treatment plant used for?
To provide Oxygen to aerobic bacteria and micro-organisms.
What do the stator windings produce in a phase 3 generator?
Large currents at supply voltage to the bus-bars.
With regarding to rotating 3 phase motors a broken supply line conductor may cause what?
Hotter running of the motor attended by buzzing/vibration of the motor.
Load sharing between AC generators can only be achieved when what is the same?
Voltage, frequency, phase rotation and phase displacement.
