BTEB Refrigeration & AC Exam study guide
BTEB Refrigeration & AC Exam · Work through your exam, one topic at a time.
The BTEB Refrigeration & Air Conditioning credential refers to the assessment side of the refrigeration and air conditioning trade programmes administered under the Bangladesh Technical Education Board (BTEB), the government board whose website lists result services for Diploma, HSC and SSC level examinations, short courses and other e-services. Candidates are typically trainees and students in technical school, polytechnic or short-course programmes who need to demonstrate competence before progressing or entering employment in the refrigeration and air conditioning trade. The BTEB Refrigeration & AC Exam study guide has 5 sections and about 1,867 words.
01Refrigeration Fundamentals
Refrigeration moves heat from a place where it is unwanted to a place where it can be rejected. Understand the four-stage vapour-compression cycle: compression (low-pressure vapour to high-pressure, high-temperature vapour), condensation (rejecting latent heat to become liquid), expansion (throttling to low pressure and temperature), and evaporation (absorbing heat from the load).
299 words, about 1 min02Refrigeration Systems and Components
Know the function and typical failure modes of each component. The compressor (reciprocating, scroll, screw, centrifugal) raises pressure; capacity control may be via unloading, VFD or cylinder bypass.
336 words, about 2 min03Air Conditioning Fundamentals and Load Estimation
Understand psychrometrics: dry-bulb temperature, wet-bulb temperature, dew point, relative humidity, humidity ratio and enthalpy. The psychrometric chart links them; sensible heat ratio (SHR) = sensible load ÷ total load determines the apparatus dew point and the required supply-air condition.
333 words, about 2 min04AC Equipment
Know the main equipment families: split and multi-split systems, packaged rooftop units, chilled-water fan coil units with air-cooled or water-cooled chillers, variable refrigerant flow systems, and evaporative coolers. Understand the difference between DX and chilled-water systems, and between air-cooled and water-cooled condensing.
297 words, about 1 min05Installation and Commissioning
Installation quality determines system performance. Understand pipe sizing and layout, correct refrigerant line sizing (suction, liquid, hot gas), oil return with traps and slopes, insulation and vapour barriers, and proper support and isolation.
602 words, about 3 min