Cost of printing different Indian currency

In our daily life we are using different Indian currency. Have you ever thought about the amount our government   is spending in printing different kinds of notes(Rs50 note,Rs100 note,etc.)

It costs 50paise for printing 5RS note.
It costs 96paise for printing 10RS note.
It costs 1.5Rupees for printing 20Rupees note.
It costs 1.81Rupees for printing 50Rupees note.
It costs 1.70Rupees for printing 100Rupees note.
It costs 3.58Rupees for printing 500Rupees note.
It costs 4.06Rupees for printing 1000Rupees note.

Can we produce electricity using silk moth cocoons?

Scientists are  saying that electricity can be produced by using  silk moth cocoons.
The membrane of silk moth cocoon contains many elements such as copper,magnesium, sulphur ,etc.
Mobile charge carriers are formed by the elements in the cocoon if  we wet the cocoon. So scientists inserted a copper rod on the outer surface of the wet cocoon and aluminum rod in the inner surface of the same cocoon. They connected a small led bulb between them. The bulb has blown for 1min.

C program for PALINDROME NUMBERS

Program to check weather the number is palindrome number or  not?
#include<stdio.h>
int main()
{
int num,a,b,rev,sum=0;
scanf("%d",&num);
b=num;
while(num>0)
{
a=num%10;
sum=sum*10+a;
num=num/10;
}
if(sum==b)
printf("yes");
else
printf("no");
return 0;
}

What is meant by linear wave shaping?

If we give a input signal(it may be in form of sinusoidal or square or ramp or etc..)  to a low pass circuit we will get some distortion in output signal this is called as linear wave shaping.

Low pass circuit: A low pass circuit is that  which gives output signal only at low frequencies i.e even if we give input at high and mid band frequencies we will not get output

Interesting thing about the squirrel cage type and wound type rotor

In both type of rotors the rotor slots will not be in  parallel with rotor shaft axis, this is done to get smoother operation.

DC generators

When are separately excited DC generators used?
Ans: If we want wide range of output voltage then SEPARATELY EXCITED DC GENERATORS are used.

But if want to maintain constant terminal voltage then we have to use CUMULATIVELY COMPOUNDED SELF EXCITED GENERATORS.

Function to return the quotient

int divide(int a,int b)
{
int c=a/b;
if((c>=1)&&(a%b==0))
return c;
else
return -1;
}