4B ABSA QUESTIONS with correct answers

4B ABSA QUESTIONS with correct
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answers


Four cycle compression ignition engine, the fuel enters the
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cylinder during what stroke ? - CORRECT ANSWERS
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✔✔compression stroke |\




Condensing turbines will: - CORRECT ANSWERS ✔✔1 - condense
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the exhaust steam in a heat exchanger
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2- will create a vacuum on the last rotating blades
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3-will have more auxillar equipment than a back pressure turbine
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In an impulse turbine the steam: - CORRECT ANSWERS
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✔✔pressure is reduced in the nozzles |\ |\ |\ |\ |\




Diesel engine cylinder scavenging: - CORRECT ANSWERS ✔✔is
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the removal of exhaust gases from the cylinder
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Diesel engines require a: - CORRECT ANSWERS ✔✔fuel injector
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The purpose of a diffuser in a centrifugical pump is to: -
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CORRECT ANSWERS ✔✔change the velocity of the liquid to
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pressure:


Reaction turbines: - CORRECT ANSWERS ✔✔have a pressure drop
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through the stationary and moving blades
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,The forced draft cooling tower is different from the induced draft
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tower because: - CORRECT ANSWERS ✔✔the induced draft tower
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has a fan which draws air up through the tower and out the
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atmosphere


Which engine has the highest compression ratio? - CORRECT
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ANSWERS ✔✔diesel engine |\ |\




The pump best suited to pump a heavy viscous liquid is a: -
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CORRECT ANSWERS ✔✔rotary pump |\ |\ |\




Which of the following types of compressors is best for high
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compression ratios and small compression volumes? - CORRECT |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔reciprocating compressor |\ |\




The motion of moving parts _________ by friction? - CORRECT
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ANSWERS ✔✔Resisted |\




Oil used in the lubrication and cooling of refrigeration
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compressors must: - CORRECT ANSWERS ✔✔be readily and easily |\ |\ |\ |\ |\ |\ |\ |\


separated from the refrigerant
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The main disadvantage of a gas turbine over other prime movers
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is: - CORRECT ANSWERS ✔✔low thermal efficiency
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, The device used for removing the heat of compression of the air
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between consecutive stages of a multi-staged compressor is
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called: - CORRECT ANSWERS ✔✔an intercooler
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When the height above sea level increases, the atmospheric
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pressure will: - CORRECT ANSWERS ✔✔decrease |\ |\ |\ |\ |\




The methods used to control the output of an air compressor are
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grouped into three categories: - CORRECT ANSWERS ✔✔start and
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stop control, variable speed control, constant speed control
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To protect the motor when starting, the compressor must be: -
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CORRECT ANSWERS ✔✔unloaded |\ |\




A thrust bearing is used to: - CORRECT ANSWERS ✔✔prevent
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axial movement of the shaft
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The type of combustion fuel control frequently used on a small
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package boiler is: - CORRECT ANSWERS ✔✔on and off control
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A fresh air supply duct allows a controlled amount of outside air
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the enter the system for ? - CORRECT ANSWERS ✔✔Ventilation
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purposes


A valve that seals on the downstroke is: - CORRECT ANSWERS
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✔✔direct acting |\