Coke deposits on the inner walls of a heater tube produce __________ when the tube is tapped lightly with a hammer?

Coke deposits on the inner walls of a heater tube produce __________ when the tube is tapped lightly with a hammer?

Coke deposits on the inner walls of a heater tube produce __________ when the tube is tapped lightly with a hammer?



a) a clear ringing tone
b) a dull sound
c) chimes
d) a vibrating sound
e) a whistling sound


Answer: B


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