IDFX LIGHTING COMPREHENSIVE TEST
PAPER QUESTIONS AND SOLUTIONS
VERIFIED PREPARATION MATERIAL
●● Gypsum Drywall Edges
Answer: Tapered: Most common; tapered on face side along the long
dimension of the panel & square edges at the end; allows for application
of reinforcing tape & joint compound without causing bulges at joints
Square: used where appearance is NOT a factor, for basic layers of 2-
layer applications & for veneer plaster work
●● Levels of Gypsum Drywall
Answer: 1: plenums above ceilings & other areas not normally open to
view (tape embedded in joint compound w/ surface free of excess
compound
2. water resistant backing board (all joints & angles have tape embedded
in joint & one separate coat of compound
3. heavy or medium textured finishes/heavy-grade wallcovering ( 2 coats
of compound)
4. Light textured or wallcoverings & where economy is concerned (3
layers)
5. all paints, severe lighting conditions (4 layers)
●● Studs are spaced how far apart?
,Answer: residential: 16" O.C.
commercial: 24" O.C.
●● Slip Joint
Answer: prevent wall from being damaged if the structural floor deflects
●● Plaster Construction
Answer: 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
●● Masonry Block Dimensions
Answer: 8"x8"x16" (-3/8" for mortar joints)
●● Demountable Partitions
Answer: Consists of a system of individual components that can be
quickly assembled, disassembled & reused with nearly total
salvageability
consists of floor runners, ceiling runners, stud sections with clips to hold
panels, & prefinished gyp. wallboard panels
,uses aluminum for framing
●● Definition: Hinges
Answer: Consist of 2 leaves with an odd number of knuckles on one leaf
and an even number of knuckles on the other
knuckles are attached with a pin
knuckle + pin = barrel (finished with tip)
●● Types of Hinge Tips
Answer: -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
●● Butt Hinge
Answer: MOST COMMON; has both leaves fully mortised into the
frame and the edge of the door so the hinge is flush with the surface of
the frame and door
, ●● raised barrel hinge
Answer: used when there is not room for the barrel to extend past the
door trim; OFFSET to allow one leaf to be mortised into the frame (kind
of has an L shape on each side)
●● swing clear hinges
Answer: has a special shape that allows the door to swing 90 degrees or
95 degrees so the full opening of the doorway is available
●● definition: latches & locksets
Answer: device to operate a door, hold in position & lock it
●● latchset
Answer: ONLY holds door in place; NO lock (i.e. restroom partitions)
●● lockset
Answer: special mechanism that allows the door to be locked with a
KEY or THUMBTURN
●● mortise lockset
Answer: installed in rectangular area cut out of door; more SECURE
than cylindrical and offers wider variety of locking options
PAPER QUESTIONS AND SOLUTIONS
VERIFIED PREPARATION MATERIAL
●● Gypsum Drywall Edges
Answer: Tapered: Most common; tapered on face side along the long
dimension of the panel & square edges at the end; allows for application
of reinforcing tape & joint compound without causing bulges at joints
Square: used where appearance is NOT a factor, for basic layers of 2-
layer applications & for veneer plaster work
●● Levels of Gypsum Drywall
Answer: 1: plenums above ceilings & other areas not normally open to
view (tape embedded in joint compound w/ surface free of excess
compound
2. water resistant backing board (all joints & angles have tape embedded
in joint & one separate coat of compound
3. heavy or medium textured finishes/heavy-grade wallcovering ( 2 coats
of compound)
4. Light textured or wallcoverings & where economy is concerned (3
layers)
5. all paints, severe lighting conditions (4 layers)
●● Studs are spaced how far apart?
,Answer: residential: 16" O.C.
commercial: 24" O.C.
●● Slip Joint
Answer: prevent wall from being damaged if the structural floor deflects
●● Plaster Construction
Answer: 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
●● Masonry Block Dimensions
Answer: 8"x8"x16" (-3/8" for mortar joints)
●● Demountable Partitions
Answer: Consists of a system of individual components that can be
quickly assembled, disassembled & reused with nearly total
salvageability
consists of floor runners, ceiling runners, stud sections with clips to hold
panels, & prefinished gyp. wallboard panels
,uses aluminum for framing
●● Definition: Hinges
Answer: Consist of 2 leaves with an odd number of knuckles on one leaf
and an even number of knuckles on the other
knuckles are attached with a pin
knuckle + pin = barrel (finished with tip)
●● Types of Hinge Tips
Answer: -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
●● Butt Hinge
Answer: MOST COMMON; has both leaves fully mortised into the
frame and the edge of the door so the hinge is flush with the surface of
the frame and door
, ●● raised barrel hinge
Answer: used when there is not room for the barrel to extend past the
door trim; OFFSET to allow one leaf to be mortised into the frame (kind
of has an L shape on each side)
●● swing clear hinges
Answer: has a special shape that allows the door to swing 90 degrees or
95 degrees so the full opening of the doorway is available
●● definition: latches & locksets
Answer: device to operate a door, hold in position & lock it
●● latchset
Answer: ONLY holds door in place; NO lock (i.e. restroom partitions)
●● lockset
Answer: special mechanism that allows the door to be locked with a
KEY or THUMBTURN
●● mortise lockset
Answer: installed in rectangular area cut out of door; more SECURE
than cylindrical and offers wider variety of locking options
