Sometimes this reactivity of your airways after an infection is the first sign you have asthma. The bit of blood may be a little blood vessel trauma from forceful coughing. It is time to see your doctor for an evaluation. Hope this helps; take care:) ...Read more.
A solenoid is a type of electromagnet when the purpose is to generate a controlled magnetic field.If the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet. solenoid is a type of electromagnet when the purpose is to generate a controlled magnetic field.
The solenoid valves are used to control the flow of the liquid or the gas (called as fluids) in the pipeline or in certain process. The solenoid valve is the electromechanical valve comprising of the solenoid coil and a plunger which is connected to the stem of the valve.In solenoid valves the core around which the insulated coil is wound is hollow.he solenoid valve is the electromechanical valve comprising of the solenoid coil and a plunger which is connected to the stem of the valve. In solenoid valves the core around which the insulated coil is wound is hollow.