Select the alternative which best describes the

7- Select the alternative which best describes the function of the flute section of a
twist drill.
A- Provides a method for cooling oil to be delivered to the cutting surface.
B- Forms the area where the drill bit attaches to the drill motor.
*C- Forms the cutting edges of the drill point.
Expl- One of the functions of the flutes cut into the shank of a twist drill is to form the
cutting edges of the drill point.
8- How many MS20470 AD-4-6 rivets will be required to attach a 10 x 5 inch plate,
using a single row of rivets, minimum edge distance, and 4D spacing?
9- Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are
called
A- spars and ribs.
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AVA 61 - Midterm (Sheet Metal, Rivets, & Structures)
10- Shallow scratches in sheet metal may be repaired by
11- What should be the included angle of a twist drill for soft metals?
A- 118°.
*B- 90°.
C- 65°.
Expl- For drilling soft metals, an included angle of about 90° (45° either side of
center) is suitable.
For normal metals, an angle of 118° (59° on either side of center) is considered the
standard lip angle.
12- When comparing the machining techniques for stainless steel sheet material to
those for aluminum alloy sheet, it is normally considered good practice to drill the
stainless steel at a
A- higher speed with less pressure applied to the drill.
*B- lower speed with more pressure applied to the drill.
C- lower speed with less pressure applied to the drill.
Expl- When drilling stainless steel, you should use a drill with a larger included
angle. Use a lower speed and more pressure than you would use for aluminum alloy.
13- A single-lap sheet splice is to be used to repair a section of damaged aluminum
skin. If a double row of 1/8-inch rivets is used, the minimum allowable overlap will be
Given the rivet diameter (D) specified in this question:
13/2(1/8") = 13/16 inches total overlap.
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AVA 61 - Midterm (Sheet Metal, Rivets, & Structures)