2-13.
Classes of threads are different
from each other in which of the
following characteristics?
2-19.
2-14
2-15
2-16
1.
Specified tolerance and/or
allowance
2.
3.
Minimum and maximum pitch
4.
Major diameter only
Major diameter and root
clearance
What part of a thread designator
number identifies the nominal or
outside diameter of a thread?
1.
The first
2.
The second
3.
The fourth
4.
The letter designator
Which of the following thread
dimensions shows a 1/4-20 left-hand
National course screw with a
tolerance or fit of 2?
1.
1/4-20 UNC
2.
1/4-20-RH-UNC
3.
1/4-20 UNC-2 LH
4.
1/4-20
Which of the following National
Form threads are most commonly
used?
1.
2.
National course (NC) and pipe.
National fine (NF) and press
fit
3.
National fine (NF) and National
course (NC)
4.
Metric and National fine (NF)
IN ANSWERING QUESTIONS 2-17 THROUGH 2-22,
REFER TO FIGURE 4-13 IN THE TEXTBOOK.
2-17.
The thread on the outside of
is an example of what type of
a bolt
t h r e a d ?
1.
A
2.
B
3.
C
4.
D
2-18.
The largest
or internal
term?
1.
A
2.
B
3.
C
4.
D
diameter of an external
thread is known by what
2-20.
2-21.
2-22.
2-23.
2-24.
The center line that runs
lengthwise through a screw is known
by what term?
1. A
2. B
3. C
4. D
The surface of the thread that
corresponds to the major diameter
of an external thread and the minor
diameter of an internal thread is
known by what term?
1. B
2. C
3. D
4. E
The surface of
corresponds to
of an external
diameter of an
the thread that
the minor diameter
thread and the major
internal thread is
known by what term?
1. A
2. C
3. D
4. E
The distance from a point on a
screw thread to a corresponding
point on the next thread, measured
parallel to the axis is known by
what term?
1. B
2. D
3. E
4. F
The distance from the root of a
thread to the crest, measured
perpendicularly to the axis, is
known by what term?
1.
Lead
2.
3.
Pitch
Depth
4.
Major diameter
What is the definition of the term
"lead"?
1.
The distance a screw thread
advances on one turn, parallel
to the axis
2.
The distance the thread is cut
from the crest to its root
3.
The distance from the thread's
pitch to its root dimension
4.
The distance between external
threads
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