Category: Engineering

Which of the following power generation technologies produces a direct current? Among these four choices, solar cells are the only power generation technology that produces a direct current. How thermal energy is produced by solar energy? Solar thermal power/electric generation systems collect and concentrate sunlight to produce the high temperature heat needed to generate electricity. […]

When was the first car made in America? 1893 Who made the 1st car? On January 29, 1886, Carl Benz applied for a patent for his “vehicle powered by a gas engine.” The patent – number 37435 – may be regarded as the birth certificate of the automobile. In July 1886 the newspapers reported on […]

How do you find the density of an ideal gas? To find this, remember the relationship between number of moles and mass. But density is m/V, so flip the equation over to get: m/V = (MMP)/(RT) = density of the gas. How do you find the density of air using the ideal gas law? The […]

Does cold work decrease grain size? The cold-worked structure forms high dislocation density regions that soon develop into networks. The grain size decreases with strain at low deformation but soon reaches a fixed size. Cold working will decrease ductility. Which of the following statements is true about cold working? 6. The working temperature of cold […]

What is the relation between velocity speed and acceleration? Speed is the rate of change of distance(basically how much distance(m) has been covered in a particular time(s)). Velocity is the rate of change of displacement( change of distance in a particular direction with respect to time) , and acceleration is the rate of change of […]

How is channel capacity calculated? According to channel capacity equation, C = B log(1 + S/N), C-capacity, B-bandwidth of channel, S-signal power, N-noise power, when B -> infinity (read B ‘tends to’ infinity), capacity saturates to 1.44S/N. How is SNR calculated? So, if your SNR measurements are already in decibel form, then you can subtract […]

What is the relation between heat pump and refrigerator? A refrigeration system cools the external fluid flowing through the evaporator, whereas a heat pump heats the external fluid flowing through the condenser. The main difference between a refrigerator and a heat pump is in the manner of operation regarding cooling or heating. Can you use […]

What is the unit of measure for electrical pressure or electromotive force? VOLT What is the Volt a measure of? The volts (symbol V) measure the different potential energy that exists between one point and the other. The volts are thus named in honor of Alessandro Volta, the inventor of the battery. “The volts measure […]

Why is it that cross slip in bcc and fcc metals is easier than that in HCP metals How does this influence the ductility of BCC fcc and hcp metals? How does this influence the ductility of BCC, FCC, and HCP metals? The cross slips in hexagonal close-packed (HCP) metals are not easy because the […]

Is informed consent always required? Informed consent serves as a valuable tool in asserting proper regulations in clinical trials, as well as providing assurance of safety for the patient. In situations such as emergency research or research with minimal risk to the subject, informed consent is not absolutely necessary. What is the ethical requirement of […]