GASCO exit exam questions and answer quiz contain questions Answer
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What is the lower flammability limit of
butane in % volume hydrocarbon of propane in air:
1. 9.5
2. 8.5
3. 2.2
4. 1.9
Deep well pump shaft bearings are cooled and lubricated by liquid
a. Cargo being pumped
b. Hydraulic oil
c. Grease
d. Inert gas
The study of behavior of matter at low
temperature is called
a. Seismology
b. Hydrograph
c. Cryogenics
d. Ecology
Fixed gas detection system alarms should be activated when the vapor
concentration reaches
a. 5
b. 20
c. 30
d. 60
A device fitted in gas vent pipeline to arrest
the passage of flame into enclosed space
a. Flame arrestor
b. Explosion proof
c. Flame screen
d. Gas free
Chemical combination of flammable substance
with oxygen is called
a. Explosion
b. Auto ignition
c. Combustion
d. None of the above
In an LNG carrier
mixture of methane and air are avoided at all time. What is the reason?
a. Risk of fire or
explosion
b. Degradation of cargo quality
c. Dilution of cargo
d. Dilution of cargo
Which cargo
operation are to be recorded in cargo record book:
a. All bunker operations
b. All petroleum cargo operations
c. All cargo operations involving NLS
d. All cargo
operations
When cargo is carried as liquid in cargo tanks and not shipped in drums, containers, or packages, what are they called as
a. Liquid cargo
b. Tank cargo
c. Oil cargo
d. Bulk cargo
Gas ship
accommodation and machinery space are:
a. Hazardous area
b. Gas safe
c. Gas dangerous
d. All the above
What are the hazards - reactivity when cargo
reacts with water called
a. Hydrate formation
b. Polymerization
c. Toxic vapor
d. None of the above
Firefighting technique with a pool fire is to sweep
a. Side to side
b. Front to back
c. Both A and B
d. None of the above
The mass of a Vapor compared with the mass of
an equal volume of air both at standard condition to temp and pressure is
a. Relative liquid density
b. Relative vapor density
c. Relative density
d. None of the above
All account accommodation ventilation systems should be stopped or operated on closed cycle if there is possibility of cargo
vapor being drawn into accommodation space
a. True
b. False
What is the
liquid relative density at atm. Boiling point for ethylene
a. 0.57
b. 0.65
The term "overall damage" includes
both safety hazards and pollution hazard.
a. True
b. False
Removal of liquid from the cargo tank may
causein inter barrier space pressure and these should be monitored throughout
the discharge
a. Same
b. Change
c. Leak
d. None of the above
Changing of cargo which may involve
a. Only gas freeing
b. Only inerting
c. Only gassing up
d. All of the above
On
which type of cargo tank would you find a bimetallic joint or STJ
a. Kvaerner Moss Type
B
b. Gas transport membrane
c. Type C
d. Prismatic Type A
If the cargo density is different from that specified by the float gauge manufacturer, what will you adjust
a. Float
correction
b. Trim correction
c. List correction
d. Tape correction
The frequency of pressure testing ashore of
BA set should at least every
a. 6 years
b. 5 years
c. 10 years
d. 15 years
What is the guiding rule for limiting
pressure surge on loading or discharging
a. Stop the cargo pump
b. First close ESD valve nearest to the pump
c. Finally close other ESD valve
d. All the above
The ventilation of the airlock should be of the pressure type
a. Negative
b. Positive
c. Neutral
d. None of the above
Why is it necessary to cool down cargo tanks
(refrigerated ships) during bulk loading
a. To avoid overflow
b. To avoid vapors emission
c. To avoid vacuum in cargo tank
d. To avoid excessive
tank pressure
An overdose of toxic petroleum vapor affects your sense of smell by
a. Reducing it temporarily
b. Taking it away
completely
c. Improving it temporarily
d. Improving it permanently
All liquefied
gases produce vapor's which have a relative vapor density greater than that of
a. Methane
b. Methane and ethylene
c. Methane, ethylene and ammonia
d. None of the above
Gas codes and
classification society rules require every tank to be fitted at least level
gauge
a. One
b. Two
c. Three
d. Four
The concentration of a hydrocarbon gas is air
below which there is insufficient hydrocarbon is called
a. Lower flammable
limit
b. Dry air
c. Upper flammable limit
d. Stoichiometric ratio
After stopping the cargo compressor, the
glycol/water system is left running to provide
a. Crank case heating
b. Remove cargo vapors
c. Both a and b
d. None of the above
