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Insulation resistance is temperature-sensitive. When temperature increases, insulation resistance decreases, and vice versa. A common rule of thumb is insulation resistance changes by a factor of two for each 10 DegrC change. So, to compare new readings with previous ones, you'll have to correct your readings to some base temperature. For example, suppose you measured 100 megohms with an insulation temperature of 30 DegrC. A corrected measurement at 20 DegrC would be 200 megohms (100 megohms times two).
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Does cold air expand?
No. air actually contracts as it gets colder, while air expands as it gets warmer. For example, lightning is so hot, it causes the air to heat up intensly. This rise in temperature causes the air to expand so fast, that it breaks the sound barrier. This causes a sonic boom, and that is the thunder that you hear after lightning strikes.
What factor other than bandwidth can also affect the rise time of a square wave?
Humidity
How does the air move during daytime?
The air moves in the exact same manner regardless of the time of day. However, air near the ground in areas where the ground level consists of vastly different materials, typical airflow during night may differ from the typical daytime situation. For example, in a coastal region, land (rocks, sand) might meet the sea. During the day, the rocks heat up quicker than the large body of water, so the air starts to rise above the land, and the local air flow goes towards the coast. However, during the night, the shore cools but the sea maintains its temperature, causing the wind direction to change to a seabound breeze during the night. These conditions can be observed in nature, however, local climate, weather conditions, currents and conditions on the shore as well as in the water will affect this phenomenon.
Why Software doesn't wear out explain?
Hardware Failure Rates The illustration below depicts failure rate as a function of time for hardware. The relationship, often called the "bathtub curve," indicates the typical failure rate of individual components within a large batch. It shows that in say a batch of 100 products, a relatively large number will fail early on before settling down to a steady rate. Eventually, age and wear and tear get the better of all them and failure rates rise again near the end of the products life. To assist in quality control, many new batches of products are 'soak' tested for maybe 24 hours in a hostile environment (temperature/humidity/variation etc.) to pinpoint those that are likely to fail early on in their life, this also highlights any inherent design/production weaknesses. These early failure rates can be attributed to two things • Poor or unrefined initial design. Correcting this, results in much lower failure rates for successive batches of the product. • Manufacturing defects i.e. defects in the product brought about by poor assembly/materials etc. during production. Both types of failure can be corrected (either by refining the design, or by replacing broken components out in the field), which lead to the failure rate dropping to a steady-state level for some period of time. As time passes, however, the failure rates rise again as hardware components suffer from the cumulative effects of dust, vibration, abuse, temperature extremes and many other environmental maladies. Stated simply, "…The hardware begins to wear out."Software Engineering Topic 1 Page 10 Software Failure Rates Software is not susceptible to the same environmental problems that cause hardware to wear out. In theory, therefore, the failure rate curve for software should take the form shown below. Undiscovered defects in the first engineered version of the software will cause high failure rates early in the life of a program. However, these are corrected (hopefully without introducing other errors) and the curve flattens as shown. The implication is clear. Software doesn't wear out. However, it does deteriorate with maintenance as shown below. During its life, software will undergo changes and it is likely that some new defects will be introduced as a result of this, causing the failure rate curve to spike as shown above. Before the curve can return to the original steady-state failure rate (i.e. before the new bugs have been removed), another change is requested, causing the curve to spike again. Slowly, the minimum failure rate level begins to rise-- the software is deteriorating due to change. Thanks & Regards, Bastin Vinoth NG
What are the pros and cons of a steam engine?
Locomotives transport food, coal, oil, and freight. This would be otherwise too heavy to fly with. It helps facilitate the world of commerce. However, they are very slow, loud and polluting to the environment.
What is the permissible temperature rise in Class F Insulation?
The maximum temperature in Class F insulation is 150* C.
What is thermistorhow is it works?
A thermistor is a temperature sensitive resistor, there are two types: 1) If the temperature rise the resistance will go higher 2) If the temperature rise the resistance will go lower
Why the resistance of conductor rise with the rise of temperature?
When the temperature of a conductor is increased, the amplitudd of vibrations of atoms increases.As a result, the probability of collision of electrons with vibrating atoms increases.That is why, it is said that the resistance of a conductor is increases with increasing temperature
What is the temperature coefficient of resistance?
The temperature coefficient of resistance is a number used to predict how the resistance of a material changes with changes in temperature. Typically the units are either resistance per temperature or 1/temperature depending on which equation is used for the calculations. For example, in copper the temperature coefficient of resistance is about 0.0039 per change in degrees Celsius. A positive temperature coefficient of resistance means that the resistance of the material will increase as temperature increases. As per the equation or say unit of resistance temperature coefficient, its definition can be given as below: " Rise in temperature per unit initial resistance, when temperature is raised by one degree Celsius is called the resistance temperature coefficient."
What can cause a solid to change into a liquid?
A rise in temperature
Why does resistance of a conductor rise with temperature?
When the temperature of a conductor is increased, the amplitudd of vibrations of atoms increases.As a result, the probability of collision of electrons with vibrating atoms increases.That is why, it is said that the resistance of a conductor is increases with increasing temperature
How does the temperature change as we rise through the troposphere?
dog
What is the difference between positive and negative temperature coefficient of resistance?
Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.
Why does the rise in temperature cause our climate to change?
Define "climate". Note the importance of temperature.
What happens to the resistance of a material with a positive temperature coefficient when it is heated?
The resistance of a material with a positive temperature coefficient increases as it is heated. This is because the atoms vibrate more vigorously with higher temperature, causing more collisions with electrons and impeding the flow of current, resulting in higher resistance.
What decreases when current increases?
Power = Current * VoltageP = I*Vtherefore for the same power, when the current decreases, the voltage increasesthis is the concept that is used in transformers for power transmission (increasing the voltage and reducing current to reduce power loss in transmission lines).
What is the overall rise in earth's average temperature called?
The rise in temperature is called Global Warming. This global warming of the earth is causing Climate Change. These two things are not the same thing.
