How do you calculate flow velocity in a pipe? Figure 1. Flow rate is the volume of fluid per unit time flowing past a point through the area A. Here the shaded cylinder of fluid flows past point P in a uniform pipe in time t. The volume of the cylinder is Ad and the […]
What is the function of a shock absorber?
What is the function of a shock absorber? The role of the shock absorber is to keep the car’s tyres in permanent contact with the road, helping to provide optimum grip, when cornering and braking. Shock absorbers are part of the suspension, so if the shocks are worn, the vehicle’s ride and comfort is compromised. […]
What did the oil drop experiment determine?
What did the oil drop experiment determine? In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces. Why was the oil drop experiment important? […]
How does an ocean thermal energy conversion OTEC system work?
How does an ocean thermal energy conversion OTEC system work? Ocean Thermal Energy Conversion (OTEC) systems use a temperature difference (of at least 77° Fahrenheit) to power a turbine to produce electricity. The vaporized fluid drives a turbine/generator. The vaporized fluid is turned back to a liquid in a condenser cooled with cold ocean water […]
What is the working principle of microwave oven?
What is the working principle of microwave oven? A microwave oven uses microwaves, which are basically radio waves, to cook food. The commonly used frequency is roughly 2,500 MHz (2.5 GHz). Radio waves in this frequency range are absorbed by water, fats and sugars. When absorbed, they are converted directly into heat. What is the […]
Who uses psychrometric chart?
Who uses psychrometric chart? Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure. They are often used to assess the properties of moist air. What is psychrometric chart in HVAC? Psychrometric chart is one of the chart that is commonly used […]
Why is a compact fluorescent light bulb more efficient than an incandescent bulb?
Why is a compact fluorescent light bulb more efficient than an incandescent bulb? The phosphor fluoresces to produce light. A fluorescent bulb produces less heat, so it is much more efficient. A fluorescent bulb can produce between 50 and 100 lumens per watt. This makes fluorescent bulbs four to six times more efficient than incandescent […]
How are folding doors used?
How are folding doors used? Folding doors can be used as internal or external room dividers and are made from a variety of materials. Most folding doors are glazed and the panels have frames of either wood, aluminium or upvc. They can open up and fold either internally or externally and are widely used in […]
What is the difference between single ended and differential signaling?
What is the difference between single ended and differential signaling? Single-ended inputs are lower in cost, and provide twice the number of inputs for the same size wiring connector, since they require only one analog HIGH (+) input per channel and one LLGND (-) shared by all inputs. Differential signals require signal HIGH and LOW […]
What is transaction in database management system?
What is transaction in database management system? A Database Transaction is a logical unit of processing in a DBMS which entails one or more database access operation. All types of database access operation which are held between the beginning and end transaction statements are considered as a single logical transaction in DBMS. What is transaction […]