Pinnacle Infotech interview questions

first step -------------------- 1.basic question from aptitude topics-- 1.average,profit loss,simple interst,compound interest,ages ,mixture alligation ,time distance, ---------------------- second step -------------------- group discussion -------------------- third step ---------------------- as i am from electrical they ask me about 1. what is the differnece btw relay and circuit breaker 2.what is transformer 3.draw the equivalent circuit of transformer 4.why we use high voltage for transmission 5.draw star delta connection 6.and some more from basic electrical ------------------ 4th step -------------------- hr general question