a) The calculations following the experiment gave accurate results. (Расчеты, выполненные после эксперимента, дали точные результаты.)
following - причастие наст. вр., является определением
b) The tasks explained by the engineer were very important. (Задачи, объясненные инженером, были очень важны.)
explained - причастие вр., является определением
c) It is necessary to make reference to the characteristics of high pressure turbines. (Необходимо упомянуть характеристики турбин высокого давления.)
Peter I ruled the Tsardom of Russia and later the Russian Empire from 7 May until his death, jointly ruling before 1696 with his half-brother. Through a number of successful wars he expanded the Tsardom into a much larger empire that became a major European power. He led a cultural revolution that replaced some of the traditionalist and medieval social and political systems with ones that were modern, scientific, westernized, and based on The Enlightenment. Peter's reforms made a lasting impact on Russia and many institutions of Russian government traced their origins to his reign. вот как-то так
a) The calculations following the experiment gave accurate results. (Расчеты, выполненные после эксперимента, дали точные результаты.)
following - причастие наст. вр., является определением
b) The tasks explained by the engineer were very important. (Задачи, объясненные инженером, были очень важны.)
explained - причастие вр., является определением
c) It is necessary to make reference to the characteristics of high pressure turbines. (Необходимо упомянуть характеристики турбин высокого давления.)
to make - инфинитив, функция подлежащего