QMED Flashcards
A selector valve is also known as a
Spool
Most large vessel steering system uses
Hydraulics for Rudder movement
According to NFPA signage “Red” means:
Fire
International convention for the prevention of pollution:
MARPOL 73/78
Violations of US environmental laws, US Mariners license can be suspended by:
US Coast Guard
Chemical data guide for bulk shipment by water is published by:
US Coast Guard
Acute exposure means:
Immediate contact
Component that enables the air compressor to start and come up to speed before compression begins:
Unloader
Prevents the refrigeration system from overheating:
Water failure
The bond on a grinding wheel describes its
Hardness
What are best examples of SafeGuards ?
Interlocks, Lock-Ins, Lockouts, Isolations
Vertical distance from the pump to the discharge level:
Discharge head
Protects the bearing housing if water leaks from the pump packing gland:
Water seal
Rotary pumps are what type of pumps
Positive displacement pump
It is the boundary and serves as a water box for fluid before and after entering the tubes
Head
“False” With regards to maximum allowable unsupported tube Length in HX is dependent on the tubes
1) diameter
2) material
3) thickness
4) Elasticity
Elasticity
HX tube are attached to
Tube sheets
Type of fitting that should not be used in systems that will be disturbed and subject to flexing or bending, Containing hot fluid or toxic gases
Compression fittings
Distance between the journal and the bearing inner diameter
Diametrical clearance
Converts hydraulic to mechanical energy, single or double acting, and is equipped with a cylinder with close fitting assembly
Actuator
What schedule are High pressure pipe
Schedule 120
Electronic component found in HVAC/R Controls that changes resistance due to change in temperature
Thermistor
Restriction to threaded tubing and pipe joint when the diameter is less than
2 inches
This sealing material is selected based on chemical compatibility temperature pressure of the system it serves
O-Ring
Very short pipe or tube with socket on both ends joining two pipes or tubes by welding brazing or soldering
Coupling
It is best suited for use on flammable liquids
Aluminum
It is important factor in the lubrication of ball in roller bearings as well as gear meshes:
Boundary lubrication
It joins a pipes internal thread to external threads
Bushing
Upper fluid boundary around a pumps shaft
Gland
Spool shaped drum fitted on a winch:
Gypsy head
What pump experience where compared to other pumps
screw pump
The component that engages and disengages the winch drum, allows slippage to prevent exceeding clutch ratings, automatically engages when power is turned off to the winch motor
Clutch
It can operate in either direction, forward or reverse of the windlass Direction:
Wildcat
Quantity flowmeters our devices that measure the amount of fluid that passes and establish point
True
Bearing surface material is Softer than the moving component so that the bearing material becomes wearable material (will wear before the moving component).
Many bearings are made of alloy of lead, bronze, brass called:
Babbitt
Rigid bushing or sleeve type bearings are generally used in
Small auxiliary machinery
Pumps,compressors, blowers, and others
Color for hydraulic oil
Orange
Color for feed water
Dark blue
Color for condensate
Light blue
A pump that is self priming with low volume, has Has wear on pump parts and not practical for a very high or very low viscosity fluid
Screw pump
An electrically driven centrifugal pump takes a suction from the Final stage distiller condenser is called:
Distillate pump
It transmits and electrical signal corresponding to a mechanical as the Helmsman turns the wheel
Synchro transmitter
Prior to getting underway what test are generally conducted
Steering test
High pressure air are categorized by
1000 psi
Medium pressure air are categorized by
150 psi - 1000 psi
Low pressure air are categorized by
150 psi
What will cause automatic compressor shut down
High frame oil temperature,
Low frame oil temperature,
Thermal motor overload (Electric motor driven compressors)
It prevents water from entering into the ventilation they operate like baffle
Airlifts
Federal hazardous material classes are:
CFR 49
Material safety data sheet (MSDS)
Means written or printed material concerning a hazardous chemical which is prepared in accordance with:
CFR 29
Chemical manufacturers or importers shall either provide the MSDS with the shipped containers
MSDS publisher:
Manufacture
How does a resistance thermometer work?
It’s operating principle Is that the electrical resistance of metals varies with temperature
Resistance thermometers Uses wires that are made out of What kind of metals
Nickel
Copper
Tantalum
A needle valve may also be used in piping system Requiring:
Find adjustment in Fluid flow
Rigid bushing or sleeve type bearings Are most often used in:
Small auxiliary machines
The volute on a centrifugal pump causes fluid pressure to
Decrease
Rudder Angle Indicator Accuracy check are done during:
While inspecting the steering gear at sea
When are steering gear test conducted
Prior to getting underway
Duel electro-hydraulic Steering units Usually operates:
With one pump on standby
What is the Characteristics Of a rotary Centrifugal Compressor
Generates large volume of air at low pressure
