Technical Measurements Flashcards

Approximately how much does one gallon of water weigh?

Answer: 8.34 pounds

Water weighs about 8.34 pounds per gallon at standard conditions.

One boiler horsepower is equal to approximately:

Answer: 33,475 BTU/h

One boiler horsepower equals about 33,475 BTU/h, or 34.5 lb of steam per hour from and at 212°F.

A natural gas bill is stated in therms. How many BTUs are in one therm?

Answer: 100,000 BTU

One therm equals 100,000 BTU of heat energy.

An electric duct heater is rated at 10 kW. What is its approximate output in BTU/h?

Answer: 34,120 BTU/h

One kilowatt equals about 3,412 BTU/h, so 10 kW ≈ 34,120 BTU/h.

For general vibration monitoring of fans and pumps, which measurement unit is most commonly trended?

Answer: Velocity in inches per second

Vibration velocity (in/s) is the standard broadband indicator of overall machine condition for typical rotating equipment.

A window AC unit delivers 12,000 BTU/h while drawing 1,000 watts. What is its EER?

Answer: 12

EER equals cooling output in BTU/h divided by power input in watts: 12,000 ÷ 1,000 = 12.

Water hardness of 10 grains per gallon is approximately how many parts per million?

Answer: 171 ppm

One grain per gallon equals about 17.1 ppm as calcium carbonate, so 10 gpg ≈ 171 ppm.