A fuse made from a 'tube' of gunpowder surrounded by a waterproofed varnished jute rope, with a timed burn time?

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Prepare for the New York State CoC Class B Pyrotechnician License Exam with our engaging quiz. Utilize flashcards and multiple choice questions, each supported by helpful hints and detailed explanations. Enhance your learning and boost your confidence for the exam!

Multiple Choice

A fuse made from a 'tube' of gunpowder surrounded by a waterproofed varnished jute rope, with a timed burn time?

Explanation:
Recognizing a fuse designed to provide a timed delay. The description—a tube of gunpowder inside a waterproof varnished jute rope—fits how a safety fuse (visco fuse) is built. The waterproof outer wrapper keeps moisture out, while the slow, consistent burn gives a reliable delay between lighting and ignition of the main charge. Portfire, by contrast, is used to light fuses or charges but does not itself provide a timed delay. The other terms don’t describe a fuse with this slow, timed-burning, waterproof construction.

Recognizing a fuse designed to provide a timed delay. The description—a tube of gunpowder inside a waterproof varnished jute rope—fits how a safety fuse (visco fuse) is built. The waterproof outer wrapper keeps moisture out, while the slow, consistent burn gives a reliable delay between lighting and ignition of the main charge. Portfire, by contrast, is used to light fuses or charges but does not itself provide a timed delay. The other terms don’t describe a fuse with this slow, timed-burning, waterproof construction.

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