Question

question 75 of 100 · multiple choice

what is an indication of a dull drill bit?

a excess shavings

b increased cutting speed

c excess heat

d drill motor stalls

Explanation:

Analyze the effects of a dull drill bit

A dull drill bit loses its sharp cutting edges, which increases friction between the tool and the workpiece. This increased friction directly generates excess heat during the drilling process.

Evaluate the given options

• Option A (excess shavings) is incorrect because a dull bit produces fewer, smaller, or powdery chips rather than excess shavings.
• Option B (increased cutting speed) is incorrect because a dull bit reduces cutting efficiency and speed.
• Option C (excess heat) is correct because increased friction from a dull edge generates significant heat.
• Option D (drill motor stalls) is incorrect as a general primary indicator, though extreme dullness can overload a motor, excess heat is the direct and immediate physical indication.

Answer:

• (A) excess shavings
• (B) increased cutting speed
• (C) excess heat (Correct answer)
• (D) drill motor stalls