ABSA 4B EXAM QUIZ BANK | 1566 QUESTIONS | WITH ALL CORRECT SOLUTIONS.
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ABSA 4B EXAM QUIZ BANK | 1566 QUESTIONS | WITH ALL CORRECT SOLUTIONS.
Internal ____ is not required for dynamic type compressors.
seals
lubrication
pressure monitoring
corrosion monitoring
temperature monitoring
b
Low pressure or high pressure are the two primary classifications of ____...
ABSA 4B EXAM QUIZ BANK | 1566 QUESTIONS |
WITH ALL CORRECT SOLUTIONS.
Internal ____ is not required for dynamic type compressors.
seals
lubrication
pressure monitoring
corrosion monitoring
temperature monitoring
b
Low pressure or high pressure are the two primary classifications of ____.
centrifugal pumps
sump pumps
boilers
draft fans
pressure controllers
e
The boiler feedwater becomes increasingly ____ as it approaches the measurement of
zero.
acidic
neutral
softer
basic
alkaline
a
The following hydrocarbon(s) may be entrained in a natural gas stream:
Propane
Butane
Ethane
Methane
All of the above
e
Although ____ is created, high viscosity oils are still preferred for low speed/high load
systems.
lower floc point oils
lower oil friction
high pour point oils
high velocity oils
higher oil friction
e
,Every shift the boiler water should be ____.
filled with dissolved solids
tested
condensed
replaced
evaporated
b
Sodium sulphite is a commonly used ____ in boilers.
oxygen scavenger
carbon dioxide scavenger
coagulant
pH inhibitor
flocculant
a
Cement may be used for the protective coating of a ____.
u-tube manometers
orifice plates
venturi tubes
pressure gauges
hot water storage tank
e
The hot exhaust gases from the gas turbine combustor travel downstream to be ____ in
the turbine blading.
expanded
filtered
heating
contracted
cooled
a
Recovery boilers must be shut down immediately when a tube leak develops because
water generates a violent physical reaction upon contacting ____.
white liquor
black liquor
green liquor
molten smelt
cooking liquor
d
In operating applications with high pressure and slow speed ____ are commonly used.
coagulants
light oils
,low viscosity mineral oils
low viscosity synthetic oils
heavy oils
e
During the power stroke of a four-stroke engine, the ___ is combusted.
lubricating oil
hydrogen
air
fuel/air mixture
fuel
d
____ are small relief valves that do not relieve pressure but are installed in systems to
warn of impending overpressurization.
Rupture discs
Fusible plugs
Turbine overspeed trips
Sentinel valves
Safety relief valves
d
The oil used in ____ must be able to dissipate the compressor heat and be easily
separated from the refrigerant.
refrigeration compressors
reciprocating pumps
air compressors
steam turbines
gas turbines
a
The antifriction bearing housing should have 2/3rd of empty space remaining after being
topped up with ____.
crude
water
lubrication
mineral oil
grease
e
Ammonia refrigerants have a high affinity for ____.
non-condensable gases
corrosion
coagulants
water
flocculants
, d
A ____ is a simple machine with two or more pulleys with a rope or cable threaded
between them.
hoist
hacksaw
block and tackle
scaffolding
portable grinder
c
____ is one of the primary disadvantages of electric heating.
Response time
Increased corrosion
Increased operating cost
Decreased heat output
Increased maintenance costs
c
____ protocol should be used if the boiler will be exposed to subfreezing temperatures
or will be shut down for an extended period or when there will be no foreseeable
urgency to restart the boiler.
Hot boiler lay-up
Ready boiler lay-up
Wet boiler lay-up
Active boiler lay-up
Dry boiler lay-up
e
A hammer is classified as a ____.
recording device
power tool
hand tool
measurement device
calibration device
c
____ is too toxic to be used as a refrigerant in building air conditioning systems.
Water
Freon
Lithium Bromide
Air
Ammonia
e
The biological breakdown of bacteria in a closed vessel could produce ____.
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