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;
}

Why DC series motors are not started with out load

If we start DC series motor with out load the speed increases which in turn  increases back EMF(proportional to speed) but due to increase in back EMF armature current decreases. Since field winding is in series the flux also decreases due to decrease in the armature current. We know that flux is inversely proportional to speed, so decrease in flux causes increase in speed. This process continues.

Theoretically speed reaches to infinity as flux tends to zero.

Practically due to high speeds the bearings,armature shaft,etc get damaged.

So keep in mind never start a DC series motor at no load.

C program for sum of powers of numbers

#include<stdio.h>
int main()
{
int a,s;
scanf("%d",&a);
s=((6*a*a*a*a*a)+(15*a*a*a*a)+(10*a*a*a)-a)/30;
printf("%d",s);
return 0;
}

C program for sum of adjacent pairs

#include<stdio.h>
int main()
{
int a,b,s;
scanf("%d %d",&a,&b);
s=0;
while(!(b==-1))
{
s=a+b;
a=b;
scanf("%d",&b);
printf("%d",s);
if(b!=-1)
printf(" ");
if(b==-1)
printf("\n");
}
return 0;
}

C program for inverted right triangle

#include<stdio.h>
int main()
{
int n,i,j,t,m;
scanf("%d",&n);
m=n;
for(i=0;i<m;i++)
  {
  t=i;
for(j=0;j<n;j++)
  {
  i=i+1;
   if(i<=9)
     printf("%d",i);
   if(i>=10)
     printf("%d",i%10);
  }
  n=n-1;
   printf(" \n ");
  i=t;
  }
return 0;
}