Answer:112.376 s
Explanation:
Given
Using Newton's law of cooling
=
=
7=
Taking log both side
t=112.376sec
Given Information:
Primary secondary voltage ratio = 2500/250 V
Short circuit voltage = Vsc = 100 V
Short circuit current = Isc = 110 A
Short circuit power = Psc = 3200 W
Required Information:
Series impedance = Zeq = ?
Answer:
Series impedance = 0.00264 + j0.00869 Ω
Step-by-step explanation:
Short Circuit Test:
A short circuit is performed on a transformer to find out the series parameters (Z = Req and jXeq) which in turn are used to find out the copper losses of the transformer.
The series impedance in polar form is given by
Zeq = Vsc/Isc < θ
Where θ is given by
θ = cos⁻¹(Psc/Vsc*Isc)
θ = cos⁻¹(3200/100*110)
θ = 73.08°
Therefore, series impedance in polar form is
Zeq = 100/110 < 73.08°
Zeq = 0.909 < 73.08° Ω
or in rectangular form
Zeq = 0.264 + j0.869 Ω
Where Req is the real part of Zeq and Xeq is the imaginary part of Zeq
Req = 0.264 Ω
Xeq = j0.869 Ω
To refer the impedance of transformer to its low voltage side first find the turn ratio of the transformer.
Turn ratio = a = Vp/Vs = 2500/250 = 10
Zeq2 = Zeq/a²
Zeq2 = (0.264 + j0.869)/10²
Zeq2 = (0.264 + j0.869)/100
Zeq2 = 0.00264 + j0.00869 Ω
Therefore, Zeq2 = 0.00264 + j0.00869 Ω is the series impedance of the transformer referred to its low voltage side.
They are as follows-
Speed
Accuracy
Storage
Versatility
Diligence
Automation
Reliability
Power of Remembering
Let us understand each characteristic in brief:-
Speed – Speed of a computer means the time it takes to complete any given task. The computer works at a very lightning speed. For example, a computer takes a second to calculate 3 million calculations rather than a human which takes years. Hence nowadays the speed of the computer is measured in terms of microseconds, Nanoseconds, and even in Pico seconds instead of seconds or milliseconds.
Accuracy – The computers are programmed and designed in such a manner that their results are almost 100% accurate. It performs all the tasks with the same accuracy. There are very few chances of uncertainty in results and even though an error occurs, it can happen either due to wrong input data or unreliable programs by a programmer. Such errors are referred to as Garbage In Garbage Out (GIGO) which means, if you provide wrong instructions to the computer then you get wrong results.
Versatility – Along with being accurate and diligent a computer is also a versatile device. It can perform several types of tasks at a time if they are reduced to a certain set of logical steps. A computer can be used for many purposes at different places such as booking air and rail tickets, weather forecasting, listening to music, and playing games. Also at a time, one can pay his utility bills and can make a monthly budget too. It can prepare documents, data sheets and also can make models of houses, dams, etc.
Diligence – The ability of a computer to perform tasks without getting tired is known as diligence. Computers are highly reliable, they do not get fed up, exhausted, or lack concentration. They can work for hours and hours unlike humans and can give accurate or error-free results. For example, humans will start feeling tired after 2 -3 hours and will lack concentration whereas a computer will keep on working until the results are achieved.
Automation – Automation means working automatically. A computer can work on its own without the intervention of the person using it. Programs can be made for the computer to perform the task and based on the sequence it executes the tasks and gives accurate results. In case an error occurs, it gives error messages too and registers the logs.
Reliability – High reliability of a computer depends on low failure rate and easy maintenance. The results given out by the computer are reliable as the accuracy is almost 100%.
Power of Remembering – The computer has the power of storing data or information for several years. It cannot lose the data on its own. A person can retrieve the data whenever required and the data remains the same after a number of years also. It gives the freedom to the user to decide on how much data to store and how much to remove.
Answer:
add resistance to a circuit
Explanation:
It depends on the design in which it is incorporated. A fixed resistor has many uses, including, but not limited to ...
- dropping voltage
- limiting current
- contributing to a time delay
- adjusting frequency response
- eliminating (or creating) signal reflections
- acting as a fuse
- calibrating or trimming a response
- providing protection against electrical shock or ESD
- acting as a reference when measuring variable resistors
Robots demonstrate modern, technological Japan because it serves as brought economical success to Japan since it help them to build products faster and efficiently.
- According to the question, we are to discuss how the robot help japan in terms of technology and modernization.
As a result of this we can see that Japan is moving forward in technology with development of robot because it makes them to build more products.
Therefore, Robot has brought economical success to Japan
Learn more about robot at:
brainly.com/question/10387419
