Fuels basic by RANA SAIFULLAH KHAN

Two stroke by RANA SAIFULLAH KHAN

Four stroke 3 by RANA SAIFULLAH KHAN

Vapour power 4 by RANA SAIFULLAH KHAN

Nuclear 2 by RANA SAIFULLAH KHAN

Nuclear by RANA SAIFULLAH KHAN

Steam power plants introduction by Rana Saifullah Khan