NCIDQ IDFX EXAM REVISION QUESTIONS AND
ANSWERS GRADED 100% SUCCESS 2025-2026.
,1. Advantages of Gypsum Drywall ANS>> 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
2. Gypsum Drywall Edges ANS>> Tapered ANS>> 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 ANS>> used where appearance is NOT a factor, for basic layers of 2-layer applications & for veneer plaster work
3. Levels of Gypsum Drywall ANS>> 1 ANS>> 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)
4. Studs are spaced how far apart? ANS>> residential ANS>> 16" O.C.
commercial ANS>> 24" O.C.
,5. Slip Joint ANS>> prevent wall from being damaged if the structural floor deflects
6. Plaster Construction ANS>> 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
7. Masonry Block Dimensions ANS>> 8"x8"x16" (-3/8" for mortar joints)
8. Demountable Partitions ANS>> 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
9. Definition ANS>> Hinges ANS>> 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)
, 10. Types of Hinge Tips ANS>> -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
11. Butt Hinge ANS>> 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
12. raised barrel hinge ANS>> 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)
13. swing clear hinges ANS>> has a special shape that allows the door to swing 90 degrees or 95 degrees so
the full opening of the doorway is available
14. definition ANS>> latches & locksets ANS>> device to operate a door, hold in position & lock it
15. latchset ANS>> ONLY holds door in place; NO lock (i.e. restroom partitions)
16. lockset ANS>> special mechanism that allows the door to be locked with a KEY or THUMBTURN
17. mortise lockset ANS>> installed in rectangular area cut out of door; more SECURE than cylindrical and otters
wider variety of locking options
ANSWERS GRADED 100% SUCCESS 2025-2026.
,1. Advantages of Gypsum Drywall ANS>> 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
2. Gypsum Drywall Edges ANS>> Tapered ANS>> 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 ANS>> used where appearance is NOT a factor, for basic layers of 2-layer applications & for veneer plaster work
3. Levels of Gypsum Drywall ANS>> 1 ANS>> 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)
4. Studs are spaced how far apart? ANS>> residential ANS>> 16" O.C.
commercial ANS>> 24" O.C.
,5. Slip Joint ANS>> prevent wall from being damaged if the structural floor deflects
6. Plaster Construction ANS>> 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
7. Masonry Block Dimensions ANS>> 8"x8"x16" (-3/8" for mortar joints)
8. Demountable Partitions ANS>> 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
9. Definition ANS>> Hinges ANS>> 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)
, 10. Types of Hinge Tips ANS>> -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
11. Butt Hinge ANS>> 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
12. raised barrel hinge ANS>> 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)
13. swing clear hinges ANS>> has a special shape that allows the door to swing 90 degrees or 95 degrees so
the full opening of the doorway is available
14. definition ANS>> latches & locksets ANS>> device to operate a door, hold in position & lock it
15. latchset ANS>> ONLY holds door in place; NO lock (i.e. restroom partitions)
16. lockset ANS>> special mechanism that allows the door to be locked with a KEY or THUMBTURN
17. mortise lockset ANS>> installed in rectangular area cut out of door; more SECURE than cylindrical and otters
wider variety of locking options
