Bolt Tightening Quiz

Why do we carry out bolt tightening to specific standards?

• To predict the behaviour of the bolt

• To put design theories into practice

• To try to prevent the failure of the joint during operation

• To keep pace with the needs of the designer

Strain is the change in length divided by the?

• 50% of the change in length

• Original length

• % extension in length

• Extended length

When using the Partially Controlled Method for Bolt Tightening the result is?

• Known and measured

• Measured

• Unknown

• Known with a certain tolerance

Force is measured in what units?

• Megawatts

• Cubic meters

• Newtons

• Litres

What is the Elastic Region in the Bolt Tightening Stress/Strain Curve?

• Property of materials to rapidly stretch along its entire length and then form a “neck” after the maximum load has been reached.

• Property of materials to deform under load but return to their original shape and size when load is removed.

• Property of materials to fracture at a certain point when excessive load is applied.

• Property of materials to deform under load but not return to their original shape and size when load is removed.

The maximum nominal tightening strain required to stretch a steel fastener is up to?

• 0.15%

• 0.20%

• 0.01%

• 0.25%

From the list below identify two safety precautions essential to adhere to when using hydraulic tensioning equipment?

• Check equipment is mounted on mobile stands before use.

• Check equipment is paint coded.

• Avoid personal contact with hydraulic fluid.

• Wear appropriate PPE.

• Check equipment is not de-tensioned.

Given the steel bolt grade of 12.9 and the thread diameter of 18 mm, what is the value of the torque should we apply when tightening?

• 467.5 Nm

• 437.4 Nm

• 648 Nm

• 382 Nm

Which one of the following documents supports the validity of a torque wrench?

• Conformity certificate

• Calibration certificate/sticker

• Accredited certificate

• Service certificate

How is Torque defined?

• Torque = Yield Strength x distance

• Torque = Force x radius

• Torque= Ultimate tensile strength x radius

• Torque = Work done x distance