Torque Flashcards
Why is torque important?
Select one:
a.
Proper torque insures correct clamping force.
b.
Proper torque maintains joint and fastener reliability and product safety.
c.
Proper torque protects the fastener from failure.
d.
All of the above.
D
When stretched, the fastener tries to ? .
Select one:
a.
become plastic
b.
break
c.
maintain its original size
d.
overcome friction
C
In the application of torque to a fastener, it is important that the bolt is not stretched beyond its ? phase.
Select one:
a.
elastic
b.
rundown
c.
yield
d.
a. or b.
e.
a. or c
A
Which of the following is not part of the phases of the fastening process?
Select one:
a.
Elastic phase
b.
Friction phase
c.
Plastic phase
d.
Rundown phase
B
The total force required in a torque application is comprised of two distinct regions. They are the ? torque and the ? torque.
Select one:
a.
dynamic breakaway / static applied
b.
friction / alignment
c.
rundown phase / elastic phase
d.
static breakaway / dynamic applied
D
Note: Static breakaway torque: The friction the fastener must overcome. Two areas of friction occur, under head friction (the fastener rubbing on the material) and thread friction. Variables that impact friction, such as rust, paint, old or damaged fasteners, can affect the torque outcome and accuracy.
Dynamic applied torque: The torque required to move or rotate the fastener after it has been seated.
The correct answer is: static breakaway / dynamic applied
Which of the following is not a primary factor that affects the application of torque?
Select one:
a.
Friction (condition of parts)
b.
Temperature
c.
The operator
d.
The torque wrench
B
The torque-tension graphic illustrates the bolt tension difference of ? pounds between dirty and clean threads when applying the torque of 140 foot-pound.
Select one:
a.
0
b.
6,000
c.
10,000
d.
18,000
C
To prevent an over-torque condition, the operator has to STOP between which of the phases listed below?
Select one:
a.
Elastic and alignment phases
b.
Elastic and plastic phases
c.
Plastic and rundown phases
d.
Rundown and alignment phases
B
Note: The operator should never over-torque into the plastic phases or permanent deformation and elongation of the fastener and/or joint will occur. This damage is referred to as “necking of the fastener”.
The rule of thumb to use when remembering how the number of hash marks relates to the grade of the bolt is to simply add ? to the number of hash marks and that is the grade for the bolt.
Select one:
a.
1
b.
2
c.
3
d.
4
B
If a bolt has three hash marks on the head, it is what grade of bolt?
Select one:
a.
Grade 3
b.
Grade 5
c.
Grade 6
d.
Metric
B
In proper use of a torque wrench, force should be applied in a pulling motion, toward the user.
Select one:
True
False
True
What length of cheater bar is needed to obtain 300 foot-pounds from a 250 foot-pound torque wrench?
Select one:
a.
2 feet
b.
3 feet
c.
5 feet
d.
A cheater bar should never be used on a torque wrench
D
(1) Bolt stretch
(2) Head friction
(3) Thread friction
Select one for each answer:
10%
45%
(1) - 10%
(2) - 45%
(3) - 45%
A connection should be tightened until the Belleville washer flattens.
Select one:
True
False
True
Note: When the Belleville washer is flattened during the torque process, this provides a degree of constant pressure (spring like pressure) to the plate connection and helps to insure a proper tension over the lifetime of the equipment.
Proper Torque us ? percent friction and ? percent fastener stretch.
Select One:
A: 90%/10%
B: 10%/90%
A
