Sigma Microsystems interview questions

There are two rounds of interviews one is HR round and the other is Technical round. For the first day they conducted HR round cum Technical round and shortlisted the candidates based on their performance after 3 days I got the call for the technical round, in this round they asked most of the questions from my graduation core subjects.

there will be 2 rounds , written and F2F interview written test will be on basic on C and Operating Systems , Electronics basics f2f more on generic topics like favorite subjects in engineering and few questions on that ,and tenure with company , salary structure