The choice for selecting and visiting a particular college for campus recruitment fully is the discretion of the companies.
They will evaluate a college on various parameters including the outside reputation of the college,the quality of the passing students of previous years, the getting of university ranks in the college or for that department , the cut off grades or marks of the bottom most admission etc.
It may be that in your college, the Electrical department may be of recent inception. It may be that the department does not have reputed or qualified teachers or standard workshop. In short, the department may not be having good infrastructure. The previous year pass percentage may be low.
Generally the vacancies in IT companies are much more than from Electrical or mechanical oriented companies. All said and done the major chunk of the campus recruited candidates are in the data entry sides first and even otherwise they will be in general streams where a very basic knowledge of IT/computer software and hardware is enough. More than that they give internal training.
Even f it is IT company, they have services and clients in Electrical and mechanical industries. So there, the engineers from those branches will be useful.
Now, you cannot complain to your HOD,but can request and suggest for inviting companies from the electrical industries. The success or failure depends on the quality of you students and what reputation you spread out by your performances.
If there is a placement officer in your college, then approach him.