ABSA 4B Questions with Correct Answers (Grade A+)
Question 1: Low pressure or high pressure are the two primary classifications of ____. centrifugal
pumps sump pumps boilers draft fans pressure controllers
Answer: e
Question 2: The boiler feedwater becomes increasingly ____ as it approaches the measurement of zero.
acidic neutral softer basic alkaline
Answer: a
Question 3: The following hydrocarbon(s) may be entrained in a natural gas stream: Propane Butane
Ethane Methane All of the above
Answer: e
Question 4: 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
Answer: e
Question 5: Every shift the boiler water should be ____. filled with dissolved solids tested condensed
replaced evaporated
Answer: b
Question 6: Sodium sulphite is a commonly used ____ in boilers. oxygen scavenger carbon dioxide
scavenger coagulant pH inhibitor flocculant
Answer: a
Question 7: Cement may be used for the protective coating of a ____. u-tube manometers orifice plates
venturi tubes pressure gauges hot water storage tank
Answer: e
Question 8: The hot exhaust gases from the gas turbine combustor travel downstream to be ____ in the
turbine blading. expanded filtered heating contracted cooled
Answer: a
Page 1
,Question 9: 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
Answer: d
Question 10: 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
Answer: e
Question 11: During the power stroke of a four-stroke engine, the ___ is combusted. lubricating oil
hydrogen air fuel/air mixture fuel
Answer: d
Question 12: ____ 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
Answer: d
Question 13: 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
Answer: a
Question 14: The antifriction bearing housing should have 2/3rd of empty space remaining after being
topped up with ____. crude water lubrication mineral oil grease
Answer: e
Question 15: Ammonia refrigerants have a high affinity for ____. non-condensable gases corrosion
coagulants water flocculants
Answer: d
Question 16: 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
Answer: c
Question 17: ____ is one of the primary disadvantages of electric heating. Response time Increased
corrosion Increased operating cost Decreased heat output Increased maintenance costs
Answer: c
Page 2
,Question 18: ____ 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
Answer: e
Question 19: A hammer is classified as a ____. recording device power tool hand tool measurement
device calibration device
Answer: c
Question 20: ____ is too toxic to be used as a refrigerant in building air conditioning systems. Water
Freon Lithium Bromide Air Ammonia
Answer: e
Question 21: The biological breakdown of bacteria in a closed vessel could produce ____. water air
precipitation oxygen methane gases
Answer: e
Question 22: Boiler feedwater is chemically treated to: Reduce foaming Reduce scale formation
Minimize boiler metal corrosion Reduce carryover All of the above
Answer: e
Question 23: A ____ is a simple machine used to lift or pull heavy loads with two or more pulleys with a
rope or cable threaded between them. hoist hacksaw block and tackle portable grinder scaffolding
Answer: c
Question 24: To prevent accumulation of oil deposits in ____ downstream equipment must be installed
to filter and remove the oil from the air. four stroke engines reciprocating engines labyrinth seals
compressed air systems two stroke engines
Answer: d
Question 25: Thermostats may be categorized: The inherent design of the temperature sensing element
The control action The temperature range Depending on the required application All of the above
Answer: e
Question 26: Sour natural gas has unacceptable quantities of the following contaminant: Ethane
Hydrogen sulphide (H2S) Mercaptan Propane Butane
Answer: b
Page 3
, Question 27: Drift eliminators are installed in cooling towers to knock out entrained ____ in the outlet
air stream. algae wood extractives floc coagulants moisture
Answer: e
Question 28: ____ are designed into large air ducts to increase the inherent stiffness. Flanges Butt
connections Circular sections Diagonal creases Thermocouples
Answer: d
Question 29: If the cross-sectional area of an air duct is decreased the velocity of the air travelling
through the air duct will ____. produce eddy-currents be increased remain constant be decreased
experience a swirling effect
Answer: b
Question 30: Cavitation in pumps is when the pressure in the suction line to the pump drops below the
vapour pressure of the liquid. To reduce or eliminate the cavitation you would? Decrease the suction
pressure Increase the suction pressure Purge the suction of the pump Increase the discharge pressure
Decrease the discharge pressure
Answer: b
Question 31: Freon-12 (R-12) is ____. corrosive on metals when contacts moisture non-toxic flammable
explosive when mixed with air toxic
Answer: b
Question 32: The design of the cone-shaped lip enables the ____ to pop open. PSV globe valve check
valve butterfly valve non-return valve
Answer: a
Question 33: A try cock is a piece of equipment installed on a boiler to measure the ____. pH flow rate
pressure temperature water level
Answer: e
Question 34: ____ is spent once it has absorbed airborne contaminants up to 20% its own weight.
Membrane filters Mechanical filters Coagulant filters Electrostatic filters Activated carbon
Answer: e
Page 4
Question 1: Low pressure or high pressure are the two primary classifications of ____. centrifugal
pumps sump pumps boilers draft fans pressure controllers
Answer: e
Question 2: The boiler feedwater becomes increasingly ____ as it approaches the measurement of zero.
acidic neutral softer basic alkaline
Answer: a
Question 3: The following hydrocarbon(s) may be entrained in a natural gas stream: Propane Butane
Ethane Methane All of the above
Answer: e
Question 4: 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
Answer: e
Question 5: Every shift the boiler water should be ____. filled with dissolved solids tested condensed
replaced evaporated
Answer: b
Question 6: Sodium sulphite is a commonly used ____ in boilers. oxygen scavenger carbon dioxide
scavenger coagulant pH inhibitor flocculant
Answer: a
Question 7: Cement may be used for the protective coating of a ____. u-tube manometers orifice plates
venturi tubes pressure gauges hot water storage tank
Answer: e
Question 8: The hot exhaust gases from the gas turbine combustor travel downstream to be ____ in the
turbine blading. expanded filtered heating contracted cooled
Answer: a
Page 1
,Question 9: 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
Answer: d
Question 10: 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
Answer: e
Question 11: During the power stroke of a four-stroke engine, the ___ is combusted. lubricating oil
hydrogen air fuel/air mixture fuel
Answer: d
Question 12: ____ 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
Answer: d
Question 13: 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
Answer: a
Question 14: The antifriction bearing housing should have 2/3rd of empty space remaining after being
topped up with ____. crude water lubrication mineral oil grease
Answer: e
Question 15: Ammonia refrigerants have a high affinity for ____. non-condensable gases corrosion
coagulants water flocculants
Answer: d
Question 16: 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
Answer: c
Question 17: ____ is one of the primary disadvantages of electric heating. Response time Increased
corrosion Increased operating cost Decreased heat output Increased maintenance costs
Answer: c
Page 2
,Question 18: ____ 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
Answer: e
Question 19: A hammer is classified as a ____. recording device power tool hand tool measurement
device calibration device
Answer: c
Question 20: ____ is too toxic to be used as a refrigerant in building air conditioning systems. Water
Freon Lithium Bromide Air Ammonia
Answer: e
Question 21: The biological breakdown of bacteria in a closed vessel could produce ____. water air
precipitation oxygen methane gases
Answer: e
Question 22: Boiler feedwater is chemically treated to: Reduce foaming Reduce scale formation
Minimize boiler metal corrosion Reduce carryover All of the above
Answer: e
Question 23: A ____ is a simple machine used to lift or pull heavy loads with two or more pulleys with a
rope or cable threaded between them. hoist hacksaw block and tackle portable grinder scaffolding
Answer: c
Question 24: To prevent accumulation of oil deposits in ____ downstream equipment must be installed
to filter and remove the oil from the air. four stroke engines reciprocating engines labyrinth seals
compressed air systems two stroke engines
Answer: d
Question 25: Thermostats may be categorized: The inherent design of the temperature sensing element
The control action The temperature range Depending on the required application All of the above
Answer: e
Question 26: Sour natural gas has unacceptable quantities of the following contaminant: Ethane
Hydrogen sulphide (H2S) Mercaptan Propane Butane
Answer: b
Page 3
, Question 27: Drift eliminators are installed in cooling towers to knock out entrained ____ in the outlet
air stream. algae wood extractives floc coagulants moisture
Answer: e
Question 28: ____ are designed into large air ducts to increase the inherent stiffness. Flanges Butt
connections Circular sections Diagonal creases Thermocouples
Answer: d
Question 29: If the cross-sectional area of an air duct is decreased the velocity of the air travelling
through the air duct will ____. produce eddy-currents be increased remain constant be decreased
experience a swirling effect
Answer: b
Question 30: Cavitation in pumps is when the pressure in the suction line to the pump drops below the
vapour pressure of the liquid. To reduce or eliminate the cavitation you would? Decrease the suction
pressure Increase the suction pressure Purge the suction of the pump Increase the discharge pressure
Decrease the discharge pressure
Answer: b
Question 31: Freon-12 (R-12) is ____. corrosive on metals when contacts moisture non-toxic flammable
explosive when mixed with air toxic
Answer: b
Question 32: The design of the cone-shaped lip enables the ____ to pop open. PSV globe valve check
valve butterfly valve non-return valve
Answer: a
Question 33: A try cock is a piece of equipment installed on a boiler to measure the ____. pH flow rate
pressure temperature water level
Answer: e
Question 34: ____ is spent once it has absorbed airborne contaminants up to 20% its own weight.
Membrane filters Mechanical filters Coagulant filters Electrostatic filters Activated carbon
Answer: e
Page 4
