WEB SERVICE - CALCULATOR
Servlets - Factorial Calculation
FormFact.html
<!-- Servlet,
form data and validation -->
<html>
<head>
<title> Forms, servlet and
factorial</title>
<style>
h3{text-align:center}
</style>
<script
type="text/javascript" language="javascript">
function fnvalidate()
{
// User Name
Validation
var Num =
document.FN.f1.value;
if
(Num.toString().trim().length==0)
{
alert(
"Error...Enter number" );
document.FN.f1.focus()
;
return
false;
}
if( isNaN(Num))
{
alert(
"Invalid Number! Should have only digits." );
document.FN.f1.focus()
;
return
false;
}
return true;
}
</script>
</head>
<body>
<br/><h3> Factorial
Calculator </h3><br/><br/>
<center>
<form name="FN" method="get"
action="http://localhost:8088/WT/FactCalc" onsubmit="return
fnvalidate();">
<label> Enter Number :
</label>
<input
type="text" name="f1" />
<br/><br/>
<input
type="submit" />
<input
type="reset" />
</form>
</html>
FactCalc.java
import
java.io.*;
import
javax.servlet.*;
import
javax.servlet.http.*;
public class
FactCalc extends HttpServlet
{
int N;
public void init(ServletConfig sc)
{
}
public void service(HttpServletRequest
req, HttpServletResponse res) throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter pw =
res.getWriter();
N =
Integer.parseInt(req.getParameter("f1"));
int fact=1;
for(int i=1;i<=N;i++)
fact=fact*i;
pw.println("<html><body><center>");
pw.println("<h3>");
pw.println("Factorial of
"+N +" is "+fact);
pw.println("</h3>");
pw.println("</center></body></html>");
pw.close();
}
public void destroy()
{
}
}
Thread Synchronization in C#
Thread Synchronization in C#
using System;
using System.Collections;
using System.Numerics;
using System.Threading;
using System.Threading.Tasks;
namespace CSharp
{
public class Q
{
Queue q = new Queue();
public void put(int n)
{
lock (this)
{
while(q.Count==1)
{
Monitor.Wait(this);
}
q.Enqueue(n);
Monitor.Pulse(this);
}
}
public int get()
{
lock (this)
{
while (q.Count==0)
{
Monitor.Wait(this);
}
int n = (int)q.Dequeue();
Monitor.Pulse(this);
return n;
}
}
}
public class Consumer
{
Q q;
public Consumer(Q q)
{
this.q = q;
new Thread(new ThreadStart(this.Consume)).Start();
}
public void Consume()
{
for (int i=1; i <= 5; i++)
{
int n = q.get();
Console.WriteLine ("Consuming {0}", n);
Thread.Sleep(200);
}
}
}
public class Producer
{
Q q;
public Producer(Q q)
{
this.q = q;
new Thread(new ThreadStart(this.Produce)).Start();
}
public void Produce()
{
for (int i=1; i <= 5; i++)
{
q.put(i);
Console.WriteLine ("Producing {0}", i);
Thread.Sleep(200);
}
}
}
public class Program
{
public static void Main(string[] args)
{
Q q = new Q();
new Producer(q);
new Consumer(q);
}
}
}
BEEME 2 Protection devices
UNIT – 3
Utilization of Electrical Power
Need for earthing
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
What is circuit breaker?
Electrical circuit breaker is a switching device which can be operated automatically or manually for protecting and controlling electrical power systems.
Applications of Circuit breakers:
The circuit breaker is a switching device which also offers protection by tripping & cutting off the supply to load in case of fault. Primarily the circuit breakers are used for switching of different kinds of load in Industries, Buildings, Commercial Complexes, and Hotels, etc.
BEEME 2 Comparisons
UNIT – 3
Utilization of Electrical Power
Compare fuse and circuit breaker
Fuse
|
Circuit breaker
|
Detects and interrupts the fault current
|
Only interrupts the fault current. Detection is done by relay system
|
Automatic operation
|
Not automatic. Relay system is required to operate it
|
Breaking capacity is less
|
Has large breaking capacity
|
Arc interruption is simple
|
Arc interruption is complicated
|
Operating time is small. Operating speed is high
|
Operating time is large. Operating speed is comparatively less
|
Replacement / rewiring required after each operation
|
No replacement needed. Easy to reset
|
Simple design. Cheap
|
Complicated design. expensive
|
Comparing Horizontal and vertical axis wind turbines
Horizontal axis wind turbines
|
Vertical axis wind turbines
| |
Axis of rotation
|
Axis of rotation is parallel to ground and wind steam
|
Axis of rotation is perpendicular to ground and wind stream
|
Mount point
|
Gearbox and generator are mounted above the ground with a tower to support them
|
Gearbox and generator are mounted at ground level. Hence does not require any support tower.
|
Output energy
|
Overall energy output is more
|
Overall energy output is less
|
Efficiency
|
Overall efficiency is more
|
Overall efficiency is less
|
Stress
|
Higher stress is put at the base of the blade by the wind
|
Higher stress is put at the center of the blade by the wind
|
Structural support
|
Requires more structural support
|
Requires less structural support
|
Installation and maintenance
|
Installation and maintenance is hard
|
Installation and maintenance is easy
|
Yaw control
|
Yaw control is necessary to turn rotor so that the blades face the wind
|
Yaw control not needed as rotor reacts to wind from any direction
|
BEEME 2 Batteries
UNIT – 3
Utilization of Electrical Power
General applications of Batteries
1. Batteries are used in starting, lightning and ignition systems.
2. They are used in back up power supply.
3. Batteries are used in portable equipment like wrist watches, mobile phones, tablets, laptops.
4. They are used in military and aerospace science.
Advantages of Ni-Cd battery
1. Only battery that can be ultra-fast charged with little stress.
2. It has long shelf life; can be stored in a discharged state.
3. Simple storage and transportation.
4. Available in wide range of sizes and performance options.
Disadvantages of Ni-Cd battery:
1. Relatively low specific energy compared with newer systems.
2. Cadmium is a toxic metal ,cannot be disposed of in landfills.
3. It has high self-discharge.
4. It has memory effect;needs full discharges.
Advantages of lead acid battery:
1. It is less expensive.
2. It is robust and tolerant to abuse.
3. It can deliver very high currents.
4. Wide range of sizes and capacities available.
Disadvantages of lead acid battery:
1. It is very bulky and heavy.
2. It has danger of over heating during charging.
3. It is not suitable for fast charging.
4. Must be stored in a charged state once the electrolyte has been introduced to avoid deterioration of the active chemicals.
Advantages of lithium battery
1. It is Eco friendly
2. It is less weight and compact.
3. It needs low maintenance.
4. It needs more charge cycles.
Disadvantages of lithium battery
1. Requires protection circuit to maintain voltage and current within safe limits.
2. It is expensive to manufacture-storage in a cool place at 40% charge reduces the aging effect.
3. It is not fully mature -metals and chemicals are changing on a continuing basis.
4. Shipment of larger quantities may be subject to regulatory control.
1.
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