ABSA 4B EXAM Questions with Complete Solutions 100% Verified 2024/2025 Internal ____ is not required for dynamic type compressors.seals lubrication pressure monitoring corrosion monitoring temperature monitoring - Correct Answer b Low pressure or high pressure are the two primary classifications of ____.centrifugal pumps sump pumps boilers draft fans pressure controllers - Correct Answer e The boiler feedwater becomes increasingly ____ as it approaches the measurement of zero.acidic neutral softer basic alkaline - Correct Answer a The following hydrocarbon(s) may be entrained in a natural gas stream: 1 / 4
Propane Butane Ethane Methane All of the above - Correct Answer 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 - Correct Answer e Every shift the boiler water should be ____.filled with dissolved solids tested condensed replaced evaporated - Correct Answer b Sodium sulphite is a commonly used ____ in boilers.oxygen scavenger carbon dioxide scavenger coagulant pH inhibitor flocculant - Correct Answer a 2 / 4
Cement may be used for the protective coating of a ____.u-tube manometers orifice plates venturi tubes pressure gauges hot water storage tank - Correct Answer e The hot exhaust gases from the gas turbine combustor travel downstream to be ____ in the turbine blading.expanded filtered heating contracted cooled - Correct Answer 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 - Correct Answer d In operating applications with high pressure and slow speed ____ are commonly used. 3 / 4
coagulants light oils low viscosity mineral oils low viscosity synthetic oils heavy oils - Correct Answer e During the power stroke of a four-stroke engine, the ___ is combusted.lubricating oil hydrogen air fuel/air mixture fuel - Correct Answer 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 - Correct Answer 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
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