Question 1

____ receive gas from the supply cylinders and deliver it to the hoses at a closely controlled pressure.

Accepted Answer

Pressure regulators are designed to receive gas from supply cylinders and deliver it to the hoses at a closely controlled pressure, making it the best choice for this question. MAPP cylinders are a type of gas cylinder, pressure gauges measure the pressure of the gas in the cylinders, and hoses are the delivery mechanism for the gas, but none of these options specifically regulate the pressure of the gas being delivered.

Question 2

The gas that combines with other elements in all combustion processes is

Accepted Answer

Oxygen is the gas that combines with other elements in all combustion processes, as it is the oxidizer that allows fuel to burn. Propane, methane, and acetylene are all fuels that require oxygen to burn, but they are not the gas that actually combines with other elements during combustion.

Question 3

Eye protection is necessary for

Accepted Answer

All three processes (welding, brazing, and soldering) involve the use of high heat and potentially harmful sparks or radiation, making eye protection necessary for safety.

Question 4

Acetylene is stored in cylinders that contain

Accepted Answer

Acetylene is often stored in cylinders containing acetone, which helps to stabilize the gas and prevent it from decomposing or exploding.

Question 5

An oxy-acetylene flame reaches a temperature of about

Accepted Answer

An oxy-acetylene flame reaches a temperature of about 6300°F, which is hot enough to melt steel.

Question 6

Oxygen cylinders are painted

Accepted Answer

Oxygen cylinders are traditionally painted green in many countries to indicate the gas they contain. This color coding helps in the quick identification of the gas, especially in medical and industrial settings.

Question 7

The ____ flame is cooler than oxy-acetylene, so it is not suitable for welding.

Accepted Answer

Propane flame is cooler compared to oxy-acetylene, so it is not suitable for welding. The temperature of a propane flame can reach up to 3,630 degrees Fahrenheit, whereas the temperature of an oxy-acetylene flame can reach up to 6,000 degrees Fahrenheit.

Quiz 4: Introduction to Welding