IN ANSWERING QUESTIONS 2-40 THROUGH 2-42,
REFER TO TABLE 1-4 IN THE TEXTBOOK.
You are testing a piece of steel on
the Rockwell tester using the
diamond penetrator and both
If the reading is 40 on
the black scale and 70 on the red
scale, what is the hardness number?
When the Rockwell hardness tester
is being used, the black dial
numbers should be read only when
what scale or penetrator is used?
l/16-inch ball penetrator
In what way should the pan be
weighed when making a G scale test
on the Rockwell hardness tester?
With the red weight only
With the black weight only
With both the red and black
Without either the red or black
When testing a metal of completely
unknown hardness on a Riehle
hardness tester, a preliminary
reading should be taken on what
scale as a guide in selecting the
proper scale to be used?
IN ANSWERING QUESTION 2-44, REFER TO TABLE
1-5 IN THE TEXTBOOK.
Which of the following aluminum
alloys is the hardest?
You check the condition of the
point of the Barcol tester by using
the test disc and find the
indicator reading is NOT within the
correct this condition by first
following what procedure?
Grind the point
Install a new point
Adjust the lower plunger guide
Adjust the plunger upper guide
When an Ernst hardness tester is
used, a direct reading from which
of the following scales should NOT
Rockwell A scale
Rockwell B scale
Rockwell C scale
The canopies of most high-speed
naval aircraft are made of what
Stretched acrylic plastic
Laminated acrylic plastic
When viewed from its edge, which of
the following plastics is
You can distinguish a plastic
enclosure from a glass enclosure by
using which of the following
Checking for a nonringing sound
while tapping lightly
Checking the ease with which it
Checking its reaction to
Checking its reaction to hexane