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The capacity of a safety valve used on a steam boiler is measured in:

A. Pounds per square inch
B. Cubic feet per minute
C. British Thermal Units
D. Gallons per hour

Answer :

Final answer:

The capacity of a safety valve used on a steam boiler is measured in pounds per square inch (psi). This unit helps gauge how much pressure the valve can withstand before it opens to release steam, which safeguards the whole system against dangerous over-pressurization. This concept is applicable in various contexts, such as pressure cookers or steam engines.

Explanation:

The capacity of a safety valve used on a steam boiler is measured in the option Pounds per square inch (psi). Safety valves are a crucial component of a steam boiler system or a pressure cooker. They protect the system from becoming over pressurized.

For example, in a pressure cooker which has a safety valve set to vent steam if the pressure exceeds 3.4 atm, this prevents an explosion from excessive internal pressure. The pressure in units of lbs/ sq. inch or PSI, gives us an accurate measure of the amount of pressure the safety valve can handle before it opens to release steam, hence controlling the pressure within the system. In the context of steam engines (like a steam locomotive), the steam drives a piston inside a chamber, and the work done is equal to the change in pressure multiplied by the change in volume (pAV), for a particular stroke of the machine.

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