Category: Engineering

Does fuel cell produce electricity? Fuel cells work like batteries, but they do not run down or need recharging. They produce electricity and heat as long as fuel is supplied. A fuel cell consists of two electrodes—a negative electrode (or anode) and a positive electrode (or cathode)—sandwiched around an electrolyte. What is the reaction in […]

Where do you put commas? Use a comma after a dependent clause that starts a sentence. A dependent clause is a grammatical unit that contains both subject and verb but cannot stand on its own, like “When I went running …” Commas always follow these clauses at the start of a sentence. How do you […]

What is the difference between 3 phase delta and 3 phase Wye? Delta systems have four wires total: three hot wires and one ground wire. Wye systems utilize a star configuration, with all three hot wires connected at a single neutral point. Wye systems, both measure 208VAC between any two hot wires, but 3-phase Wye […]

What is the moment of inertia about Centroidal axis? The moment of inertia of an area with respect to any given axis is equal to the moment of inertia with respect to the centroidal axis plus the product of the area and the square of the distance between the 2 axes. The parallel axis theorem […]

Which part of the body was used to define the length of a cubit? arm How was length measured in olden days? In ancient times, the body ruled when it came to measuring. The length of a foot, the width of a finger, and the distance of a step were all accepted measurements. Inch: At […]

How do you know if a flow is laminar or turbulent? For practical purposes, if the Reynolds number is less than 2000, the flow is laminar. If it is greater than 3500, the flow is turbulent. Flows with Reynolds numbers between 2000 and 3500 are sometimes referred to as transitional flows. What is wide rectangular […]

What happened in the Old Stone Age? Lasting roughly 2.5 million years, the Stone Age ended around 5,000 years ago when humans in the Near East began working with metal and making tools and weapons from bronze. During the Stone Age, humans shared the planet with a number of now-extinct hominin relatives, including Neanderthals and […]

How many years will it take for an investment to double in value if it earns 5% compounded annually? This is the number of years it will take for your money to double. For example, if your money is earning an 8 percent interest rate, you’ll double your money in 9 years (72 divided by […]

Which is the first phase of an incident and the Planning P? 1. Initial Response, Objectives and Briefing: The leg of the “P” describes the initial response activation period for the Tier 1 Emergency Response Team (ERT), the Tier 2 Incident Management Team (IMT), and the Emergency Coordination Center (ECC) or Emergency Operations Center (EOC). […]

What is the efficiency at maximum power transfer condition? The efficiency is only 50% when maximum power transfer is achieved, but approaches 100% as the load resistance approaches infinity, though the total power level tends towards zero. Efficiency also approaches 100% if the source resistance approaches zero, and 0% if the load resistance approaches zero. […]