What are the 4 elements of the pass technique for using a fire extinguisher? Select the appropriate type of fire extinguisher. Discharge the extinguisher within its effective range using the P.A.S.S. technique (pull, aim, squeeze, sweep). Back away from an extinguished fire in case it flames up again. When operating a fire extinguisher Remember pass […]
Is the expression for work of a polytropic process restricted to processes of an ideal gas?
Is the expression for work of a polytropic process restricted to processes of an ideal gas? The specific heats will be discussed later. Notice that the results we obtained for an ideal gas undergoing a polytropic process when n = 1, is identical to that for an ideal gas undergoing the isothermal process….The Polytropic Process: […]
What is the purpose of economizer?
What is the purpose of economizer? A common application of economizers in steam power plants is to capture the waste heat from boiler stack gases (flue gas) and transfer it to the boiler feedwater. This raises the temperature of the boiler feedwater, lowering the needed energy input, in turn reducing the firing rates needed for […]
Why did Pennsylvania farmers revolt against the federal government in the Whiskey Rebellion?
Why did Pennsylvania farmers revolt against the federal government in the Whiskey Rebellion? Whisky Rebellion was in 1794 when farmers of western Pennsylvania protested against the whiskey tax. This was an “excessive” tax -an internal tax-passed a few years before to raise additional funds for the national government. They were mad about this because usually […]
How do you calculate pipe diameter by flow and pressure?
How do you calculate pipe diameter by flow and pressure? Multiply this answer by the pressure drop across the pipe, measured in pascals. With a pressure drop, for instance, of 80,000 pascals, 0.0025 x 80,000 = 200. Multiply the constant pi by the answer to Step 1: 3.142 x 0.0025 = 0.00785. This answer is […]
Why HF has highest boiling point?
Why HF has highest boiling point? Solution : In HF , there is H-bonding and hence the molecules are associated together but in HCl, there is no H-bonding . Although hydrogen bonding in HF is stronger than in water, yet water has much higher boiling point than HF. … Which has higher boiling point HF […]
What can I do to protect myself and others from COVID-19?
What can I do to protect myself and others from COVID-19? Wash your hands often with plain soap and water. Cover your mouth and nose with a cloth face covering or non-surgical mask when around others. Avoid crowds and practice social distancing (stay at least 6 feet apart from others). What should you do after […]
What is a good air exchange rate?
What is a good air exchange rate? ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, “Ventilation and Acceptable Indoor Air Quality in Residential Buildings”) that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per … […]
What is it called when water infiltrates the ground?
What is it called when water infiltrates the ground? Groundwater flows underground Some of the precipitation that falls onto the land infiltrates into the ground to become groundwater. If the water meets the water table (below which the soil is saturated), it can move both vertically and horizontally. What is the water that runs off […]
What is the most common type of rigid coupling?
What is the most common type of rigid coupling? There are three main types of rigid couplings: sleeve, flanged and clamped. For commercial shafting, a rigid coupling may be a sleeve with the shafts pressed into each end or it may be a clamping sleeve. The sleeve on each shaft end may have an external […]