Category: Engineering

How do I calculate the present value of future payments? To determine the present value of a future amount, you need two values: interest rate and duration….Let’s break it down: Start with your interest rate, expressed as a fraction. So 5% is 0.05. Add 1 to the interest rate. Raise the result to the power […]

How do you calculate pulley weight? Calculate the force caused by gravity on the basic pulley system using the following equation: G = M x n (gravitational acceleration). The gravitational acceleration is a constant equal to 9.8 m/s². The mass M = 9g, so G = 9g x 9.8 m/s² = 88.2gm/s², or 88.2 newtons. […]

What is a radio frequency identification reader? Radio Frequency Identification (RFID) refers to a wireless system comprised of two components: tags and readers. The reader is a device that has one or more antennas that emit radio waves and receive signals back from the RFID tag. What is RFID reader and tag? RFID is an […]

What determines the speed of an AC induction motor quizlet? Ac induction motor speed is determined by the current frequency and the number of. This type of ac motor is characterized by low starting torque and is suitable for light applications such as a refrigerator evap motors. What are the two principal parts of an […]

Do ionic compounds conduct electricity in the solid state? Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move. What is stronger […]

How does a solid state laser work? A solid state laser is one that uses a crystal, whose atoms are rigidly bonded, unlike a gas. The crystal produces laser light after light is pumped into it by either a lamp or another laser. Since the laser light travels in the same direction as an intense […]

How do you determine stress and strain? Stress is the ratio of force over area (S =F/A, where S is stress, F is the external force or load and A is the cross-sectional area). Strain is the ratio of change in length to the original length, when a given body is subjected to some external […]

What is a good WiFi dB signal? -50 dBm: This is considered an excellent signal strength. -60 dBm: This is a good signal strength. -67 dBm: This is a reliable signal strength. This is the minimum for any online services that require a reliable connection and Wi-Fi signal strength. How many dBm is a good […]

What is the W wire on a thermostat? W – This is the terminal for heating. This wire should go directly to the heating source whether it be a gas or oil furnace, electric furnace, or boiler or auxiliary heating for a heat pump. What does R and W mean on thermostat? W wire – […]

What differences if any would you expect in the properties of castings made by permanent mold vs sand casting processes? When compared to sand castings, permanent mold castings have improved surface finishes, less machining allowances required, and closer net shaped profiles which are made possible by the metal mold configurations. What is the difference between […]