ABSA 4B Practice questions with answers

ABSA 4B Practice questions with answers
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In order to protect the driver, a start-stop air compressor should
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be equipped with:
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A) |\




Safety heads |\




B) |\




An intercooler
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C) |\




Manual cylinder bleed petcocks
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D) |\




Pre-start automatic unloading |\ |\




E) |\




An automatic blowdown system - CORRECT ANSWERS ✔✔D)
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Pre-start automatic unloading |\ |\




When the supply is above the pump the total static head of the
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pump will be the:
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,A) |\




Capacity of the pump |\ |\ |\




B) |\




Difference between the static suction head and the static
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discharge head |\




C) |\




Sum of the static suction head and the static discharge head
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D) |\




Discharge pressure in metre |\ |\ |\




E) |\




Discharge head of the pump - CORRECT ANSWERS ✔✔B)
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Difference between the static suction head and the static
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discharge head |\




What kind of shaft seal would be most appropriate to use where
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some leakage is acceptable?
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A) |\

,Mechanical


B) |\




Liquid Film |\




C) |\




Dry gas |\




D) |\




Carbon rings |\




E) |\




Labyrinth - CORRECT ANSWERS ✔✔E)
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Labyrinth


Sliding vane compressors:
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A) |\




Use cylinder valves
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B) |\




Are 100% efficient
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, C) |\




Are double acting compressors
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D) |\




Are positive displacement compressors
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E) |\




Fall into the centrifugal compressor category - CORRECT
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ANSWERS ✔✔D) |\ |\




Are positive displacement compressors
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Each hot water heating boiler shall be equipped with stop valves
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in the supply and return connections to:
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A) |\




Drain off the boiler without emptying the system
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B) |\




To drain the boiler
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C) |\




Prevent over pressure of the boiler
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D) |\