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The Book is based on latest syllabus as per NSQF Level 4 of DGT. The book is for ITI Students of Refrigeration & Air Conditioning Technician Trade. It covers the theory part of Refrigeration & Air Conditioning Technician trade for 2 years. The book is based upon latest exam pattern of NIMI & DGT. It covers entire syllabus with simple language and comprehensive examples. The book is in Hindi language and also includes previous 10 years paper’s questions & answers so that the students can have a better preparation for exam.