FDNY Z51 REFRIGERATION EXAM 2 LATEST VERSIONS ACTUAL EXAM COMPLETE 250 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+BRAND NEW!!.pdf

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




EST TAURIS AND A STUDY GUIDE EXA
n n n n n n




M 2024 VERSION 400 QUESTIONS WITH
n n n n n n




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
n n n n n n n n n n


y to of the following the most likely cause for this condition is -
n n n n n n n n n n n n n



...ANSWER...Water leaks through the mechanical seals
n n n n n n




The only refrigerant/temperature chart available to a refrigerati
n n n n n n n



on engineer lists the temperature In ﾟ
n n n n n n



C if the chart indicates a Celsius temperature of 4ﾟ
n n n n n n n n n



this is equivalent to -
n n n n n



...ANSWER .. 39.2ﾟ

The use of oil in the refrigeration machine is to -
n n n n n n n n n n



...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
n n n n n n n n n n n n



ge manifold - ...ANSWER...Vacuum pump
n n n n




There is a decrease in efficiency of a reciprocating compressor.
n n n n n n n n n n



The most likely is caused by -
n n n n n n



...ANSWER...Leaking suction valve n n

,The suction and discharge valve of the reciprocating compresso
n n n n n n n n



r are mounted as follows -
n n n n n



...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 -
n n n n n n n n



...ANSWER...Constant level of refrigerant in the evaporator n n n n n n




Which of these compressors is not a positive type compressor
n n n n n n n n n n



displacement - ...ANSWER...Centrifugal n n




When is emergency power not required according to code -
n n n n n n n n n



...ANSWER...Data centers n




What is the most widely used regulation book by operating engi
n n n n n n n n n n



neers - ...ANSWER...EPA n n




What type of refrigerant do you need FDNY approval for -
n n n n n n n n n n



...ANSWER...Propane

Centrifugal pressure is determined by - n n n n n



...ANSWER...Speed of motor
n n n




Liquid refrigerant that has passed through a metering device is
n n n n n n n n n n



at - ...ANSWER...Low pressure saturated liquid
n n n n n




What is the advantage of a shell and tube condenser as oposed t
n n n n n n n n n n n n



o a shell and coil condenser - ...ANSWER...Better heat transfer
n n n n n n n n n

,Where is the muffler located -
n n n n n



...ANSWER...Between the compressor and condenser
n n n n n




After recovering liquid refrigerant from a centrifugal chiller the
n n n n n n n n



next step shall be - ...ANSWER...Recover vapor
n n n n n n n




How long must a fire alarm log book be kept -
n n n n n n n n n n



...ANSWER...3 years n




What is the minimum requirement of an engineer needs to log
n n n n n n n n n n n



readings - ...ANSWER...Once per shift n n n n




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



t- n



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



control the elevator n n




You are the only engineer on duty with the machine running a v
n n n n n n n n n n n n



ice president tells you to shovel snow what should you do
n n n n n n n n n n


- ...ANSWER...Do not leave the building
n n n n n




How often must you do emergency power testing -
n n n n n n n n



...ANSWER...Monthly

What is the responsibility of AB29 certificate of fitness holder -
n n n n n n n n n n



...ANSWER...Inspect the battery system
n n n n




An engineer observes a gauge to read saturation pressure of re
n n n n n n n n n n



frigerant if chilled water circulated as the cooling medium this
n n n n n n n n n n



reading best be used to estimate the -
n n n n n n n



...ANSWER...Temperature of the chilled water being p n n n n n n



umped to the spaces being cooled
n n n n n

, Regardless of the ASHRAE refrigeration classification in use
n n n n n n n n



in the event of a refrigerant escape the engineer should be awar
n n n n n n n n n n n



e of - ...ANSWER...asphyxiation
n n n




When is a chemical fire extinguisher and system needed -
n n n n n n n n n



...ANSWER...Where water is not sufficient n n n n




What type of refrigerants found inside the machines gages -
n n n n n n n n n



...ANSWER...Same type as the refrigerant inside the machine n n n n n n n




Fireproof decorations in buildings are used for -
n n n n n n n



...ANSWER...They don't catch fire in an emergency n n n n n n




Water regulating valves are used for -
n n n n n n



...ANSWER...Maintain condenser pressure To a pre determine n n n n n n



d level
n




How long does it take to warm up a steam turbine -
n n n n n n n n n n n



...ANSWER...10 to 15 minutes n n n




Why is a pressure relief out better than a fusible plugs -
n n n n n n n n n n n


...ANSWER...Minimize refrigerant los n n




You are performing hot work near a sprinkler head what can yo
n n n n n n n n n n n



u do to prevent the fire alarm system from going off -
n n n n n n n n n n n



...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 -
n n n n n n n



...ANSWER...Automatic