Category: Engineering

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. […]

What is a bimetallic strip made of? The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass. How does a bimetallic strip work? Bimetallic strips A traditional thermostat has two pieces of different metals bolted together […]

Which of the following yielding criteria is more conservative for ductile materials? Of the failure criteria, the Tresca is the most conservative for all materials, the von Mises the most representative for ductile materials, and the Rankine the best fit for brittle materials. Which is most suitable theory of failure for ductile materials? 83 – […]

How do we get the impulse response function H T of a system given a system equation? Given the system equation, you can find the impulse response just by feeding x[n] = δ[n] into the system. If the system is linear and time-invariant (terms we’ll define later), then you can use the impulse response to […]

How do you calculate voltage drop in a series circuit? To calculate voltage drop, E, across a component, you need to know the resistance of the component and the current thru it. Ohm’s Law is E=I⋅R , which tells us to then multiply I by R . E is the voltage across the component also […]

How do you calculate hydraulic conductivity from permeability? It is the soil’s hydraulic conductivity after the effect of fluid viscosity and density are removed. It is calculated as hydraulic conductivity (K) multiplied by the fluid viscosity divided by fluid density and the gravitational constant. Permeability (k) has the dimension of area (e.g., cm2). What does […]

How much thrust does it take to lift 100KG? To lift a 100KG payload you need thrust greater than Payload +vehicle weight+ fuel weight + excess thrust to accelerate. The Williams FJ33 is in the 5000-7000N thrust range, with a basic dry mass of about 150Kg. What aircraft has the best thrust-to-weight ratio? For many […]

Is it better to wire solar panels in series or parallel? The main thing to remember is that wiring in series will increase your voltage, while wiring in parallel will increase your amperage. Both of the voltage and amperage need to be considered when designing your system, especially when it comes to finding an inverter […]

How do you find the impulse response of an LTI system? The impulse response for an LTI system is the output, y ( t ) y(t) y(t), when the input is the unit impulse signal, σ ( t ) \sigma(t) σ(t). In other words, when x ( t ) = σ ( t ) , […]

Which of the following is an essential safety procedure that protects workers from injury while working on or near electrical circuits and equipment? Lock-out/tag-out What are the most common electrical safety issues that safety professionals encounter? The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, […]