Question

a balanced flame with equal oxygen and fuel gas
a. oxidizing flame
a flame with excess oxygen, making it hotter and more forceful
b. neutral flame
a flame with excess fuel gas, producing a feathered inner cone
c. carburizing flame

Explanation:

1. For "a balanced flame with equal oxygen and fuel gas": A neutral flame in welding (commonly in processes like oxy - fuel welding) has equal amounts of oxygen and fuel gas. So this matches option b (neutral flame).
2. For "a flame with excess oxygen, making it hotter and more forceful": An oxidizing flame has excess oxygen, which makes it hotter and more forceful compared to other flame types. So this matches option a (oxidizing flame).
3. For "a flame with excess fuel gas, producing a feathered inner cone": A carburizing (also called reducing) flame has excess fuel gas, and one of its characteristics is a feathered inner cone. So this matches option c (carburizing flame).

Answer:

1. "a balanced flame with equal oxygen and fuel gas" - b. neutral flame
2. "a flame with excess oxygen, making it hotter and more forceful" - a. oxidizing flame
3. "a flame with excess fuel gas, producing a feathered inner cone" - c. carburizing flame