Develop pneumatic circuit to transfer block from a magazine
                3/2 way pneumatic DCV, pilot signal must be:
              
              
              
                If air is fed to port P2, and port p1 is closed and air moves to 'A'. This is operation of:
              
              
              
                If air is fed to port P2, port p1 and air moves to 'A'. This is operation of:
              
              
              
                4/2 way pneumatic DCV, pilot signal must be:
              
              
              
                In order to attain maximum benefit out of quick exhaust valve, the port A of the valve should be directly connected to the: