Installations Flashcards
When constructing a walk-in freezer box, where is the vapour barrier installed?
a) under the floor slab
b) inside, on the coldest side
c) outside, on the warmest side
d) around any penetration sleeves
c)
Which of the following would be the best place to mount a wall thermostat?
a) kitchen
b) bathroom
c) exterior wall
d) near return air grille
d)
Condensate piping must be properly trapped to prevent?
a) ice formation
b) condensate running off evaporator coil
c) condensate overflowing the drain pain
d) excessive air noise in the piping
d)
Fresh air ducts used to route outdoor air to interior spaces, connect to the
a) vent piping
b) combustion air duct
c) supply side of duct system
d) return side of duct system
d)
The external equalizer connection to the suction line, should be located
a) next to the txv bulb
b) 6-8” upstream sensing bulb
c) 6-8” downstream sensing bulb
d) none of above
c)
For every 12k btuh of cooling, in open drive compressor air conditioning, the heat rejection is roughly
a) 12k btuh or 1.0 times net ref effect
b) 9k btuh or 0.75 times net ref effect
c) 15k btuh or 1.25 times net ref effect
c)
To protect a load, safety devices are often wired in
a) parallel
b) series
c) upstream
d) downstream
b)
Disadvantage of a mercury bulb switch?
a) unreliable
b) must be level
c) tend to brun contacts
d) tend to chatter
b)
Thermostat is properly calibrated when
a) set point and control point are equal
b) room temp is comfortable
c) there is no dead band
d) control point and thermometer reading are equal
a)
What minimum height must a refrigeration pipe be that crosses an area that affords a passageway?
a) 9ft
b) 6ft
c) 8.5ft
d) 7.5ft
d)
When installing a display freezer, how would you level the unit?
a) level to high point
b) not bother
c) grind floor so floor is level under unit
d) combination of shimming and grinding
a)
A fan in a display case is used for what purpose?
a) assist in condenser air circ
b) assist in maintaining air patterns
c) keep flies away
d) blow warm store air away
b)
ON an ammonia system for a rec centre the refrigeration lines maybe painted
a) suction light green and discharge red
b) suction red discharge green
a)
Once the plastic pipe for a secondary refrigeration or coolant have been laid and before they are back filled they must be
a) stretched
b) shrunk to fit
c) pressure tested
d) painted with a corrosion resistant finish
a)
What do you put on the top of the sleepers in an arena install?
a) pipe chairs
b) floor coolant piping
c) sideboards
d) sleeping spectators
a)
Spacing between sleepers or chairs in an arena floor is a usual minimum of
a) 3ft
b) 2 yards
c) 10ft
d) 6”
a)
How would you hoist an electric motor?
a) half hitches around shaft
b) rope woven through feet
c) lifting eye screwed in top
d) chain
c)
The sleepers installed in a rink floor are used to
a) support headers
b) support insulation
c) support concrete
d) support chairs for the refrigerant piping
d)
A hanger supported by 2 rods and from 2 separate roof support members is a
a) pivot type hanger
b) point ot point hanger
c) trapeze hanger
d) a 2 point clevis hanger
c)
Before slab for rink surface is poured the secondary ref piping is
a) x-rayed for cracks
b) pressure tested
c) re glued
d) stretched
d)
Length of the liquid line will usually
a) increase SH absorbed by the ref
b) increase SC due to TD between ambient air and ref leaving condenser
b)
What shall be used between back of flare and the nut?
a) nothing
b) lubricant
c) gasket
d) pipe sealing compound
b)
What type of rigid harness to lift an electric motor?
a) wrap around synthetic web sling
b) eyebolt and shackle
c) cable and U bolt
d) bridal sling
b)
When making 90deg bends in tubing where is the measurement between bends taken?
a) centre of bend
b) back of bend
c) end of bend
a)
