Torque Tightening

Question 1

How much force must be applied to a two-foot-long torque wrench to achieve 250 foot-pounds of torque?

Answer 1

125 lbs

Question 2

What are we trying to achieve with a torque wrench?

A) Proper clamping force
B) Torque tightening
C) Spring action

Answer 2

A) Proper clamping force

Question 3

Clamping force is created by the spring action of the bolt.

A) True
B) False

Answer 3

A) True

Question 4

The greater the tension, the greater the clamping force.

A) True
B) False

Answer 4

A) True

Question 5

Friction between the threads (dirty threads) does not affect the torque value.

A) True
B) False

Answer 5

B) False

Question 6

The total force required in a torque application is comprised of two distinct regions. They are the ___ torque and the ___ torque.

A) dynamic breakaway / static applied
B) friction / alignment
C) rundown phase / elastic phase
D) static breakaway / dynamic applied

Answer 6

D) static breakaway / dynamic applied

Question 7

Breakaway torque is affected by ___.

A. friction under the head of the bolt
B. metallurgy
C. thread friction
D. a. or b.
E. a. or c.

Answer 7

E. a. or c.

Question 8

Torque is typically measured in which of the following units?

A. Inches and centimeters
B. Inch-pounds, foot-pounds, and Newton-meters
C. Pounds and kilograms
D. Watts and volts

Answer 8

B. Inch-pounds, foot-pounds, and Newton-meters

Question 9

Bolts under tension act like springs, stretching and returning to their original shape.

A) True
B) False

Answer 9

A) True

Question 10

It is necessary to use a lubricant for fasteners and parts during torque application.

A) True
B) False

Answer 10

A) True

Question 11

When stretched, the fastener tries to ___.

A. become plastic
B. break
C. maintain its original size
D. overcome friction

Answer 11

C. maintain its original size

Question 12

Manufacturers are specifying torque values followed by an angle for fasteners in high-performance equipment.

A) True
B) False

Answer 12

A) True

Question 13

Match the following terms with their definitions.

I) The torque measured during the fastening process, representing the actual stretching of the fastener.
II) The torque required to overcome initial friction and set a fastener in motion.

A) Static breakaway torque
B) Dynamic applied torque

Answer 13

I - B
II - A

Question 14

What percentage of torque distribution during the fastening process is attributed to overcoming static breakaway friction?

A. 10%
B. 50%
C. 90%
D. 100%

Answer 14

C. 90%

Question 15

Static breakaway torque is typically ? of the total torque value.

A. 50%
B. 75%
C. 90%
D. 100%

Answer 15

C. 90%

Question 16

Using the formula for torque, how much force must be applied to a 40-inch-long torque wrench to achieve 400 foot-pounds of torque?

A. 120 lbs
B. 125 lbs
C. 135 lbs
D. 167 lbs

Answer 16

A. 120 lbs