S12 FDNY EXAM AND PRACTICE EXAM NEWEST 2024 ACTUAL EXAM COMPLETE 400 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+.pdf

FDNY Z51 TEST EXAM ,Z51 WRITTEN T n n n n n n




EST TAURIS AND A STUDY GUIDE EXA
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M 2024 VERSION 400 QUESTIONS WITH
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DETAILED VERIFIED ANSWERS AND R n n n n




ATIONALES /A+ GRADE n n




ASSURED


FDNY Z51 EXAM 2024 n n n




A refrigerant engineer verifies that a chilled water pump is cavit
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y to of the following the most likely cause for this condition is -
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...ANSWER...Water leaks through the mechanical seals
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The only refrigerant/temperature chart available to a refrigerati
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on engineer lists the temperature In ﾟ
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C if the chart indicates a Celsius temperature of 4ﾟ
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this is equivalent to -
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...ANSWER .. 39.2ﾟ

The use of oil in the refrigeration machine is to -
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...ANSWER...Reduce wear and friction in the compressor parts n n n n n n n




Which of the following will connect to the Middle port on a gau
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ge manifold - ...ANSWER...Vacuum pump
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There is a decrease in efficiency of a reciprocating compressor.
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The most likely is caused by -
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...ANSWER...Leaking suction valve n n

,The suction and discharge valve of the reciprocating compresso
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r are mounted as follows -
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...ANSWER...Discharge valve on top of the valve plate and suc n n n n n n n n n



tion valve below n n




A high side float is used to maintain -
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...ANSWER...Constant level of refrigerant in the evaporator n n n n n n




Which of these compressors is not a positive type compressor
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displacement - ...ANSWER...Centrifugal n n




When is emergency power not required according to code -
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...ANSWER...Data centers n




What is the most widely used regulation book by operating engi
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neers - ...ANSWER...EPA n n




What type of refrigerant do you need FDNY approval for -
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...ANSWER...Propane

Centrifugal pressure is determined by - n n n n n



...ANSWER...Speed of motor
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Liquid refrigerant that has passed through a metering device is
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at - ...ANSWER...Low pressure saturated liquid
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What is the advantage of a shell and tube condenser as oposed t
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o a shell and coil condenser - ...ANSWER...Better heat transfer
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,Where is the muffler located -
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...ANSWER...Between the compressor and condenser
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After recovering liquid refrigerant from a centrifugal chiller the
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next step shall be - ...ANSWER...Recover vapor
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How long must a fire alarm log book be kept -
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...ANSWER...3 years n




What is the minimum requirement of an engineer needs to log
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readings - ...ANSWER...Once per shift n n n n




When entering phase 2 firemen service what statement is correc
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t- n



...ANSWER...The elevator operator is the only person that can
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control the elevator n n




You are the only engineer on duty with the machine running a v
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ice president tells you to shovel snow what should you do
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- ...ANSWER...Do not leave the building
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How often must you do emergency power testing -
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...ANSWER...Monthly

What is the responsibility of AB29 certificate of fitness holder -
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...ANSWER...Inspect the battery system
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An engineer observes a gauge to read saturation pressure of re
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frigerant if chilled water circulated as the cooling medium this
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reading best be used to estimate the -
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...ANSWER...Temperature of the chilled water being p n n n n n n



umped to the spaces being cooled
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, Regardless of the ASHRAE refrigeration classification in use
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in the event of a refrigerant escape the engineer should be awar
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e of - ...ANSWER...asphyxiation
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When is a chemical fire extinguisher and system needed -
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...ANSWER...Where water is not sufficient n n n n




What type of refrigerants found inside the machines gages -
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...ANSWER...Same type as the refrigerant inside the machine n n n n n n n




Fireproof decorations in buildings are used for -
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...ANSWER...They don't catch fire in an emergency n n n n n n




Water regulating valves are used for -
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...ANSWER...Maintain condenser pressure To a pre determine n n n n n n



d level
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How long does it take to warm up a steam turbine -
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...ANSWER...10 to 15 minutes n n n




Why is a pressure relief out better than a fusible plugs -
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...ANSWER...Minimize refrigerant los n n




You are performing hot work near a sprinkler head what can yo
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u do to prevent the fire alarm system from going off -
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...ANSWER...Put a non combustible barrier to protect the sprin n n n n n n n n



kler

What type of sprinkler heads need inspecting -
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...ANSWER...Automatic