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There is no particular book for any PSU, these are all practice books which contains objective questions for practice. To success in any competitive exam practice is more important than simply studying.. All the best!!!!
For aptitude book i already wrote an article on best aptitude book you can check it here.
Practice objective question book for PSU by made easy
Objective Electrical and electronics and communications
Keywords: bel pe syllabus 2014, syllabus for bel exam electronics,bel previous papers for ece.