As you have asked about the CDAC entrance exam, I am giving you information about it, check below for the details

Admissions to all PG Diploma courses of C-DAC are done through C-DAC’s Computerised Common Admission Test (C-CAT).
Every year, C-CAT is usually conducted in June (for August admissions) and December (for February admissions).
Entrance exam (C-CAT) for the August 2016 batch shall be held in June 2016

Schedule for the C-DAC Common Admission Test (C-CAT) 2016 is given below

Event Dates
Beginning of Online Registration and Application for C-CAT To be announced
Closing of Online Registration & Application, and Payment of Examination Fee for C-CAT To be announced
Downloading of C-CAT Admit Cards To be announced
C-DAC’s Common Admission Test (C-CAT) To be announced
Announcement of C-CAT Ranks To be announced

Insofar CDAC C-CAT Aug 2016 has not been officially announced.

C-CAT has three sections (Section A, Section B, Section C) of one-hour duration each

C-CAT Syllabus

Syllabus of the different sections of test papers in C-CAT

Test Paper Topics
Section A English, Quantitative Aptitude, Reasoning
Section B Computer Fundamentals, C Programming, Data Structures, Data Communications & Networking, Object Oriented Programming Concepts, Operating Systems
Section C Computer Architecture, Digital Electronics, Microprocessors