_____________________ bits are used when some rocks are so abrasive that steel bits have to be replaced after they have been drilled only few centimetres of hole.(a) Carbide insert bits(b) Tile bits(c) Bullet pilot point bits(d) Spur point bitsI had been asked this question during an interview for a job.My question comes from Drilling and Road Making Equipments topic in portion Construction Equipments of Construction & Building Materials

_____________________ bits are used when some rocks are so abrasive th

1.	_____________________ bits are used when some rocks are so abrasive that steel bits have to be replaced after they have been drilled only few centimetres of hole.(a) Carbide insert bits(b) Tile bits(c) Bullet pilot point bits(d) Spur point bitsI had been asked this question during an interview for a job.My question comes from Drilling and Road Making Equipments topic in portion Construction Equipments of Construction & Building Materials
Answer» Right choice is (a) CARBIDE insert bits Easy explanation: The actual DRILLING points in CASE of carbide insert bits consists of very hard metal, TUNGSTEN carbide, which is embedded in steel. These bits are considerably more EXPENSIVE than Steel bits.

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