Millwright Shafts and Attachments Exam
Questions $ Answers (2025) Update
Always replace set screws when equipment is given a major _____________
a. face lift
b. over haul
c. revision
d. extension - Answer-b. over haul
Normally shaft type and _____________ are selected when equipment is designed
a. dimensions
b. size
c. diameter
d. thickness - Answer-b. size
Feather keys permit end movement of the two parts either in operation or during
assembly. They come in two types
a. plain, rounded
b. sunk, extrusion
c. fixed, sliding
d. sliding, staitonary - Answer-c. fixed, sliding
A square or rectangle key with an enlarged head on one end is called a
_____________--- headed key. This allows for quick extraction and is used where parts
are removed at frequent intervals
a. fixed feather
b. square
c. boxed
d. Gibb - Answer-d. Gib
The standard taper for taper keys is 1`in 96 or 1/8 in 12" - Answer-The standard taper
for taper keys is 1`in 96 or 1/8 in 12"
Woodruff keys are used when keying shafts to mating parts. The key is
______________
a. square
b. rectangle
c. offset
d. semi circular - Answer-d. semi circular
**The circular shape permits the key to align itself to suit either a parallel or tapered
shaft. The design stops tipping. Used extensively in light duty applications**
, Woodruff keys can be purchased in standard sizes. The digit before the last two is width
in thirty seconds. The last two digits is the nominal diameter in ___________ of an inch
a. quarters
b. half
c. three quarters
d. eights - Answer-d. eights
example #406 key has
4x1/32=1/8 width
6x1/8=3/4 nominal diameter
As a rule of thumb the width of the key is _____________ the nominal diameter of the
shaft
a. 1/2
b. .34
c. 1/4
d. 1/8 - Answer-c. 1/4
Parallel key seats may be cut at the end of the shaft, this makes them a _________
keyseat and anywhere along the shaft, this makes them a _____________ keyseat
a. woodruff, parallel
b. boxed, tapered
c. plain, tapered
d. open, boxed - Answer-d. open, boxed
_____________________ is the prescribed difference between maximum material
limits of mating parts.
a. fit
b. mill surface
c. allowance
d. tightness - Answer-c. allowance
**Negative allowance refers to maximum interference**
The degree of fit is a result of specifying a ______________ to each mating part.
a. allowance
b. guidance
c. measurement
d. tolerance - Answer-d. tolerance
Interference fit maintains some ___________ between mating parts at all times. Some
additional tools may be necessary to assemble/disassemble.
a. clearance
b. total
c. allowance
d. Interference - Answer-d. interference
Questions $ Answers (2025) Update
Always replace set screws when equipment is given a major _____________
a. face lift
b. over haul
c. revision
d. extension - Answer-b. over haul
Normally shaft type and _____________ are selected when equipment is designed
a. dimensions
b. size
c. diameter
d. thickness - Answer-b. size
Feather keys permit end movement of the two parts either in operation or during
assembly. They come in two types
a. plain, rounded
b. sunk, extrusion
c. fixed, sliding
d. sliding, staitonary - Answer-c. fixed, sliding
A square or rectangle key with an enlarged head on one end is called a
_____________--- headed key. This allows for quick extraction and is used where parts
are removed at frequent intervals
a. fixed feather
b. square
c. boxed
d. Gibb - Answer-d. Gib
The standard taper for taper keys is 1`in 96 or 1/8 in 12" - Answer-The standard taper
for taper keys is 1`in 96 or 1/8 in 12"
Woodruff keys are used when keying shafts to mating parts. The key is
______________
a. square
b. rectangle
c. offset
d. semi circular - Answer-d. semi circular
**The circular shape permits the key to align itself to suit either a parallel or tapered
shaft. The design stops tipping. Used extensively in light duty applications**
, Woodruff keys can be purchased in standard sizes. The digit before the last two is width
in thirty seconds. The last two digits is the nominal diameter in ___________ of an inch
a. quarters
b. half
c. three quarters
d. eights - Answer-d. eights
example #406 key has
4x1/32=1/8 width
6x1/8=3/4 nominal diameter
As a rule of thumb the width of the key is _____________ the nominal diameter of the
shaft
a. 1/2
b. .34
c. 1/4
d. 1/8 - Answer-c. 1/4
Parallel key seats may be cut at the end of the shaft, this makes them a _________
keyseat and anywhere along the shaft, this makes them a _____________ keyseat
a. woodruff, parallel
b. boxed, tapered
c. plain, tapered
d. open, boxed - Answer-d. open, boxed
_____________________ is the prescribed difference between maximum material
limits of mating parts.
a. fit
b. mill surface
c. allowance
d. tightness - Answer-c. allowance
**Negative allowance refers to maximum interference**
The degree of fit is a result of specifying a ______________ to each mating part.
a. allowance
b. guidance
c. measurement
d. tolerance - Answer-d. tolerance
Interference fit maintains some ___________ between mating parts at all times. Some
additional tools may be necessary to assemble/disassemble.
a. clearance
b. total
c. allowance
d. Interference - Answer-d. interference
