NCIDQ IDFX Exam with all Correct & 100% Verified
Answers |Actual Complete Exam |Already Graded A+
Advantages of Gypsum Drywall ✔Correct Answer-low install cost, quick & easy installation, fire
resistance, sound control capability, easy availability, versatility, ease of finishing & decorating, ease
of installation of doors/other openings
Gypsum Drywall Edges ✔Correct 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 ✔Correct 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? ✔Correct Answer-residential: 16" O.C.
commercial: 24" O.C.
Slip Joint ✔Correct Answer-prevent wall from being damaged if the structural floor deflects
Plaster Construction ✔Correct Answer-1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
Masonry Block Dimensions ✔Correct Answer-8"x8"x16" (-3/8" for mortar joints)
Demountable Partitions ✔Correct 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 ✔Correct 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 ✔Correct Answer--flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge ✔Correct 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 ✔Correct 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 ✔Correct 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 ✔Correct Answer-device to operate a door, hold in position & lock it
latchset ✔Correct Answer-ONLY holds door in place; NO lock (i.e. restroom partitions)
lockset ✔Correct Answer-special mechanism that allows the door to be locked with a KEY or
THUMBTURN
mortise lockset ✔Correct Answer-installed in rectangular area cut out of door; more SECURE than
cylindrical and offers wider variety of locking options
cylindrical ✔Correct Answer-most common; simple to install in holes drilled into door, relatively
inexpensive, most common in residential (like doors in home bedroom)
pre-assembled ✔Correct Answer-rectangular box that fits within a notch cut in the edge of the
door; easier to install than mortise; door knob OR lever can be used
center hung pivot ✔Correct Answer-allow door to swing in either direction & is completely
concealed
pivots CANNOT be used with a door stop (instead use a flexible strip of wool pile or synthetic
stripping can be rabbeted into the edge of the door) on the same side of the door with both jambs
because it makes it difficult to seal the door against sound or light transmission on the hinge and
strike sides
closers ✔Correct Answer-automatically return a door to its closed position after it is opened
control the DISTANCE a door can be OPENED & thereby protect the door and the surrounding
construction from damage
door coordinator ✔Correct Answer-device that coordinates the closing sequence of the two doors
so that they close completely, rather than having the leaf with the astagral close first and prevent the
other leaf from closing
intumescent gasketing ✔Correct Answer-cannot be used alone; expands upon exposure to heat
and forms a tight, fire-resistant seal against the passage of smoke, gases, and heat
,Fire rated glazing ✔Correct Answer--wired: mesh of wire embedded in the middle of the sheet;
NOT tempered & doesn't qualify as safety glazing for hazardous locations
-tempered, fire protective glass
-glass block
glazing beads ✔Correct Answer-used to hold the glass in place
framing glass ✔Correct Answer-glass set in small channel or angle frames at the top and bottom
and simply butt-joined on sides
Fire Rated Doors ✔Correct Answer-1-hr rated exit access corridor or where a smoke & draft
assembly is acquired: 20 minutes door rated
occupancy separation: 3/4-hr door rated
1 hr rated exit stair enclosure: 1 hr door rated
2 hr rated exit stair enclosure: 1 1/2 hr door rated
integrated ceilings ✔Correct Answer-suspended ceiling system specifically designed to
accommodate acoustical ceiling tile, light fixtures, supply & return air grilles, fire sprinklers and
partition attachment in a CONSISTENT, UNIFIED way
all proprietary systems intended to be used in commercial applications where the partition lights &
other elements connected to the ceiling change FREQUENTLY
all components designed for max. REUSABILITY & FLEXIBILITY
stainless steel ✔Correct Answer-used for its corrosion resistance, strength & appearance
brass & bronze ✔Correct Answer-predominantly copper
in practical use, many alloys that are really brass are referred to as bronze
although corrosion resistant, it changes color with age & exposure to moisture in the air
finish carpentry ✔Correct Answer-exposed wood construction assembled AT THE JOB SITE (i.e.
doors & windows, door & window trim, standard wood base & other molding, site-built stairs &
handrails)
architectural woodwork ✔Correct Answer-CUSTOM, SHOP-fabricated millwork built of lumber,
finished wood & other materials
Finish carpentry grade ✔Correct Answer-determines the type & number of allowable defects
-B & better: excellent for natural finishes/paint (supply limited)
-C select: slightly more defects & usually best grade to specify for painting & some natural finishes
vertical grain: tends to warp less, more abrasion resistant, stain more uniformly, cut so annual
growth rings are PERPENDICULAR to face of board
, plywood ✔Correct Answer--made from an odd # of layers of thin veneer glued together under
heat & pressure
-used in FINISH carpentry (door trims, etc.)
particleboard ✔Correct Answer--composed of small wood particles, fibers, and CHIPS of various
sizes mixed together in a binder and formed under pressure into a panel
-commonly used as a SUBSTRATE for natural and laminate veneers in architectural woodwork
construction (i.e. casework not built on site)
-most common, dimensionally stable; smooth surface; impact resistance
MDF ✔Correct Answer--made from wood particles REDUCED to fibers (fluff) in a moderate-
pressure stream vessel and then combined with a resin and bonded together under heat and
pressure
-most DIMENSIONALLY STABLE
-used for painting, thin overlay materials, veneers and high pressure decorative laminate, shelving,
molding, and furniture
Stairs ✔Correct Answer--step: portion of egress achieving a change in elevation by means of a
SINGLE riser
-stairway: a change in elevation having 2 OR MORE risers
winding vs. curved stairway ✔Correct Answer--winding: tapered treads that are wider at one end
than the other
-curved: SIDES whose SHAPE is a curve (inside smaller arc cannot be less than twice the required
width of the stair or it is winding)
carriage vs. stringer ✔Correct Answer-cut out of 2"x12" members to SUPPORT treads and risers/
holds treads and risers together VS members run along sides of stairs
steel beam & girder system ✔Correct Answer--large members called GIRDERS span between
columns and small beams are framed into them
-girders span SHORT DISTANCE because they carry the weight of the beams (beams span longer
distance because they frame into the girders)
-framing is usually covered with steel decking, which spans between the beams, then concrete
topping is poured over the decking to complete the floor slab (EASY to penetrate holes)
-found in MID to HIGH rise office buildings
-usually LIMITED SPACE between the bottom of the girders and the suspended ceiling (possibility of
adding new mech. ductwork or installing large recessed light fixtures should be reviewed before final
decisions are made)
open web STEEL joist system ✔Correct Answer--joists span between beams or bearing walls
-steel decking spans between joists and a concrete slab is poured on top of the decking (EASY to
penetrate holes)
-one-story/low rise buildings with wide column spacing
-because webs are open, mech. and elec. service ducts, pipes, and conduits can easily be hung from
the bottom of the joists
Answers |Actual Complete Exam |Already Graded A+
Advantages of Gypsum Drywall ✔Correct Answer-low install cost, quick & easy installation, fire
resistance, sound control capability, easy availability, versatility, ease of finishing & decorating, ease
of installation of doors/other openings
Gypsum Drywall Edges ✔Correct 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 ✔Correct 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? ✔Correct Answer-residential: 16" O.C.
commercial: 24" O.C.
Slip Joint ✔Correct Answer-prevent wall from being damaged if the structural floor deflects
Plaster Construction ✔Correct Answer-1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
Masonry Block Dimensions ✔Correct Answer-8"x8"x16" (-3/8" for mortar joints)
Demountable Partitions ✔Correct 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 ✔Correct 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 ✔Correct Answer--flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge ✔Correct 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 ✔Correct 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 ✔Correct 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 ✔Correct Answer-device to operate a door, hold in position & lock it
latchset ✔Correct Answer-ONLY holds door in place; NO lock (i.e. restroom partitions)
lockset ✔Correct Answer-special mechanism that allows the door to be locked with a KEY or
THUMBTURN
mortise lockset ✔Correct Answer-installed in rectangular area cut out of door; more SECURE than
cylindrical and offers wider variety of locking options
cylindrical ✔Correct Answer-most common; simple to install in holes drilled into door, relatively
inexpensive, most common in residential (like doors in home bedroom)
pre-assembled ✔Correct Answer-rectangular box that fits within a notch cut in the edge of the
door; easier to install than mortise; door knob OR lever can be used
center hung pivot ✔Correct Answer-allow door to swing in either direction & is completely
concealed
pivots CANNOT be used with a door stop (instead use a flexible strip of wool pile or synthetic
stripping can be rabbeted into the edge of the door) on the same side of the door with both jambs
because it makes it difficult to seal the door against sound or light transmission on the hinge and
strike sides
closers ✔Correct Answer-automatically return a door to its closed position after it is opened
control the DISTANCE a door can be OPENED & thereby protect the door and the surrounding
construction from damage
door coordinator ✔Correct Answer-device that coordinates the closing sequence of the two doors
so that they close completely, rather than having the leaf with the astagral close first and prevent the
other leaf from closing
intumescent gasketing ✔Correct Answer-cannot be used alone; expands upon exposure to heat
and forms a tight, fire-resistant seal against the passage of smoke, gases, and heat
,Fire rated glazing ✔Correct Answer--wired: mesh of wire embedded in the middle of the sheet;
NOT tempered & doesn't qualify as safety glazing for hazardous locations
-tempered, fire protective glass
-glass block
glazing beads ✔Correct Answer-used to hold the glass in place
framing glass ✔Correct Answer-glass set in small channel or angle frames at the top and bottom
and simply butt-joined on sides
Fire Rated Doors ✔Correct Answer-1-hr rated exit access corridor or where a smoke & draft
assembly is acquired: 20 minutes door rated
occupancy separation: 3/4-hr door rated
1 hr rated exit stair enclosure: 1 hr door rated
2 hr rated exit stair enclosure: 1 1/2 hr door rated
integrated ceilings ✔Correct Answer-suspended ceiling system specifically designed to
accommodate acoustical ceiling tile, light fixtures, supply & return air grilles, fire sprinklers and
partition attachment in a CONSISTENT, UNIFIED way
all proprietary systems intended to be used in commercial applications where the partition lights &
other elements connected to the ceiling change FREQUENTLY
all components designed for max. REUSABILITY & FLEXIBILITY
stainless steel ✔Correct Answer-used for its corrosion resistance, strength & appearance
brass & bronze ✔Correct Answer-predominantly copper
in practical use, many alloys that are really brass are referred to as bronze
although corrosion resistant, it changes color with age & exposure to moisture in the air
finish carpentry ✔Correct Answer-exposed wood construction assembled AT THE JOB SITE (i.e.
doors & windows, door & window trim, standard wood base & other molding, site-built stairs &
handrails)
architectural woodwork ✔Correct Answer-CUSTOM, SHOP-fabricated millwork built of lumber,
finished wood & other materials
Finish carpentry grade ✔Correct Answer-determines the type & number of allowable defects
-B & better: excellent for natural finishes/paint (supply limited)
-C select: slightly more defects & usually best grade to specify for painting & some natural finishes
vertical grain: tends to warp less, more abrasion resistant, stain more uniformly, cut so annual
growth rings are PERPENDICULAR to face of board
, plywood ✔Correct Answer--made from an odd # of layers of thin veneer glued together under
heat & pressure
-used in FINISH carpentry (door trims, etc.)
particleboard ✔Correct Answer--composed of small wood particles, fibers, and CHIPS of various
sizes mixed together in a binder and formed under pressure into a panel
-commonly used as a SUBSTRATE for natural and laminate veneers in architectural woodwork
construction (i.e. casework not built on site)
-most common, dimensionally stable; smooth surface; impact resistance
MDF ✔Correct Answer--made from wood particles REDUCED to fibers (fluff) in a moderate-
pressure stream vessel and then combined with a resin and bonded together under heat and
pressure
-most DIMENSIONALLY STABLE
-used for painting, thin overlay materials, veneers and high pressure decorative laminate, shelving,
molding, and furniture
Stairs ✔Correct Answer--step: portion of egress achieving a change in elevation by means of a
SINGLE riser
-stairway: a change in elevation having 2 OR MORE risers
winding vs. curved stairway ✔Correct Answer--winding: tapered treads that are wider at one end
than the other
-curved: SIDES whose SHAPE is a curve (inside smaller arc cannot be less than twice the required
width of the stair or it is winding)
carriage vs. stringer ✔Correct Answer-cut out of 2"x12" members to SUPPORT treads and risers/
holds treads and risers together VS members run along sides of stairs
steel beam & girder system ✔Correct Answer--large members called GIRDERS span between
columns and small beams are framed into them
-girders span SHORT DISTANCE because they carry the weight of the beams (beams span longer
distance because they frame into the girders)
-framing is usually covered with steel decking, which spans between the beams, then concrete
topping is poured over the decking to complete the floor slab (EASY to penetrate holes)
-found in MID to HIGH rise office buildings
-usually LIMITED SPACE between the bottom of the girders and the suspended ceiling (possibility of
adding new mech. ductwork or installing large recessed light fixtures should be reviewed before final
decisions are made)
open web STEEL joist system ✔Correct Answer--joists span between beams or bearing walls
-steel decking spans between joists and a concrete slab is poured on top of the decking (EASY to
penetrate holes)
-one-story/low rise buildings with wide column spacing
-because webs are open, mech. and elec. service ducts, pipes, and conduits can easily be hung from
the bottom of the joists
