Abrasive wheels

An abrasive wheel mounted onto a portable machine has a bond type indicated by the letter "B", what letter must be next to and to the right of it?

• A

• F

• T

• X

The relationship between the speed rating on the abrasive wheel and the machine must

• be lower on the abrasive wheel than the machine spindle

• be greater on the abrasive wheel than the machine spindle

• be equal

• not be equal

A ring test is conducted to

• check that a resinoid abrasive wheel has been mounted correctly

• check that a vitrified bonded abrasive wheel has been mounted correctly

• check for invisible cracks/damage in a resinoid bonded abrasive wheel before mounting onto a machine

• check for invisible cracks/damage in a vitrified bonded abrasive wheel before mounting onto a machine

What is the maximum permissible gap between an abrasive wheel and the work rest on an off-hand grinder?

• 3 mm

• 3 cm

• 5 mm

• 5 cm

What grade of eye protection must be worn when grinding using a resinoid bonded abrasive wheel?

• Grade "A" high energy impact

• Grade "B" medium energy impact

• Grade "F" low energy impact

• Grade "R" slight energy impact