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ITI/NCVT RAC Mechanic (AITT Theory)

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Cheat sheet

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Key terms

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Study plan

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Common mistakes

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Case studies

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Exam-day guide

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About this exam

The ITI/NCVT RAC Mechanic (AITT Theory) is the All India Trade Test theory paper for candidates who have completed the Refrigeration and Air Conditioning Mechanic trade under the Craftsman Training Scheme. It is conducted by the National Council for Vocational Training (NCVT) and is one of the requirements for the National Trade Certificate. The exam assesses trade theory across the full scope of the trade: safety and workshop practice, basic electricity and controls, thermodynamics and psychrometry, the vapour compression cycle, refrigerants and lubricants, major components, domestic and commercial appliances, air conditioning systems, installation and servicing, and electrical/electronic controls. Questions are multiple-choice, and the paper is commonly available in Hindi and English. Because the syllabus is broad, successful preparation means working through each domain systematically, not just memorising a few cycle diagrams. Use the official CTS syllabus as your checklist, practise numerical problems on heat load, superheat/subcooling and psychrometry, and revise component functions and fault symptoms until you can explain them without notes. Confirm the current exam pattern, duration and pass criteria on the official DGT/NCVT portal, as schemes are periodically revised.

What you'll study

Trade safety, hand tools, measuring instruments and workshop practice8% Basic electricity, electrical measuring instruments and control devices10% Thermodynamics, heat, temperature, pressure and psychrometry fundamentals10% Refrigeration principles, vapour compression cycle and system components14% Refrigerants, lubricants, their properties, handling and environmental regulations8% Compressors, condensers, evaporators, expansion devices and accessories12% Domestic and commercial refrigeration appliances (refrigerators, deep freezers, water coolers, bottle coolers, visi coolers)10% Air conditioning systems: window, split, cassette, ductable, package and central plants12% Installation, commissioning, servicing, troubleshooting and preventive maintenance10% Electrical controls, motors, starters, wiring diagrams and PCB/electronic controls6%
Common questions

About ITI/NCVT RAC Mechanic (AITT Theory) preparation

What is the AITT theory paper for RAC Mechanic?

It is the All India Trade Test theory examination for ITI trainees in the Refrigeration and Air Conditioning Mechanic trade. It tests trade theory knowledge required for the National Trade Certificate. The paper is multiple-choice. The official DGT/NCVT portal publishes the current scheme details.

How many questions are there and how much time is allowed?

The official body publishes the current question count and duration. These are not fixed in public sources and can change with scheme revisions. Check the DGT/NCVT website or your institute notice for the exact pattern before your exam.

What is the passing score?

The passing score is set by NCVT and published in the current AITT scheme. It is not stated here because no official source was supplied. Refer to the official DGT/NCVT portal or your training institute for the exact pass marks.

How difficult is the exam?

Difficulty is moderate for candidates who have covered the full CTS syllabus. The paper is broad rather than deep: many topics, each with basic recall and simple application. Numerical questions on heat load, superheat and psychrometry are common. Weak areas are usually electrical controls and troubleshooting logic.

Can I retake the exam if I fail?

Retake rules are set by NCVT and the state directorates. The official body publishes the current policy on supplementary examinations. Check the DGT/NCVT portal or ask your institute for the exact procedure and any waiting period.

In what language is the paper available?

The AITT is commonly reported to be bilingual, in Hindi and English. The official language options are confirmed in the current scheme. If you are more comfortable in one language, practise technical terms in both, because some terms are easier to recognise in English.

What should I study first?

Start with thermodynamics and the vapour compression cycle, because most other topics depend on them. Then move to components, refrigerants, and appliances. Finish with air conditioning systems, installation and servicing, and electrical controls. This order builds understanding instead of isolated facts.

What are common reasons candidates fail?

Common failure modes are neglecting electrical controls and wiring diagrams, memorising component names without function, ignoring numerical problems, and not revising refrigerant handling and environmental rules. Another is misreading multi-choice options under time pressure. Practise timed mock tests to fix this.

Is the exam based only on the textbook?

The exam is based on the NCVT CTS syllabus for the RAC Mechanic trade. Questions can come from any topic in that syllabus. Use the syllabus as your primary checklist. Textbooks and trade theory guides help, but they are not official question sources.

How do I confirm the current exam pattern?

Visit the official DGT/NCVT portal or contact your ITI. The scheme, including question count, duration, pass marks and retake policy, is published there. Do not rely on coaching-centre handouts alone, because schemes are revised periodically.