Are igneous rocks used for building? One of the most common igneous rocks is granite (Figure 4.1). Granite is used extensively in building materials and making statues. Figure 4.1: Granite is an igneous rock used commonly in statues and building materials. Figure 4.2: Pumice is a light igneous rock used for abrasive materials. What are […]
What license is required for technicians to work with refrigerants?
What license is required for technicians to work with refrigerants? EPA Certifications. EPA Section 608 Certification is required for HVAC technicians who buy or work with any kind of refrigerants. HVAC technicians must pass an exam specific to one of three specializations in order to become EPA certified: Small appliances. What jobs can you get […]
What happens when TCC solenoid goes bad?
What happens when TCC solenoid goes bad? The main symptom of a TCC solenoid failure is the converter is not locking up. When the converter is not locking up you will notice the engine’s RPMs staying higher under load at highway speeds. Another symptom of a failed TCC solenoid is a fault code. How do […]
What is undercooling in refrigeration?
What is undercooling in refrigeration? The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. Normally, a refrigeration system has a subcooling stage, allowing technicians to be certain that the quality, in which the refrigerant reaches the next step on the cycle, is the desired one. […]
What is optimization query optimization methods?
What is optimization query optimization methods? Query optimization is the overall process of choosing the most efficient means of executing a SQL statement. SQL is a nonprocedural language, so the optimizer is free to merge, reorganize, and process in any order. The database optimizes each SQL statement based on statistics collected about the accessed data. […]
What is fluid power technology?
What is fluid power technology? Fluid power is the technology of generating, controlling, and applying smooth, effective power of pumped or compressed fluid, either a liquid (hydraulics) or air (pneumatics) to push, pull, rotate, regulate, or drive virtually all of the mechanisms of modern industry. How is power transmitted in fluid power? Hydraulic power, also […]
What is the coefficient of performance of the refrigerator?
What is the coefficient of performance of the refrigerator? The coefficient of performance, COP, of a refrigerator is defined as the heat removed from the cold reservoir Qcold, (i.e. inside a refrigerator) divided by the work W done to remove the heat (i.e. the work done by the compressor). How do you calculate the cooling […]
What are the 4 parts of a screw?
What is very important to remember when using a centrifuge?
What is very important to remember when using a centrifuge? If the liquid has a higher or lower density than water, you must balance the tubes by mass, not volume. The total mass of each tube should be as close as possible – this becomes increasingly important at very high rotor speeds. Running a centrifuge […]
What are the 4 mechanisms of change?
What are the 4 mechanisms of change? Allele frequencies in a population may change due to four fundamental forces of evolution: Natural Selection, Genetic Drift, Mutations and Gene Flow. What are the 5 mechanisms of change? There are five key mechanisms that cause a population, a group of interacting organisms of a single species, to […]