Section A
Section A contains short questions that test basic concepts of thermal system design such as refrigeration, air conditioning, compressors, and heat exchangers. Students need to give brief definitions and explain basic terms related to thermal engineering.
Example Questions from Section A:
What is bypass factor?
What is sensible heating process?
What is surging in compressors?
Define polytropic efficiency of compressor.
Differentiate centrifugal and axial flow compressor.
What is slip factor?
What is fouling factor in heat exchanger?
How can fouling be reduced?
How is condenser size optimized?
What environmental factors are considered in thermal system design?
What are selection factors of heat exchangers?
Section B
Section B contains medium-length questions that require explanation of refrigeration systems, air conditioning, compressors, and heat exchanger design. Students must describe working principles, design considerations, and perform engineering calculations.
Example Questions from Section B:
Classify internal and system heat gain.
Design condenser for refrigeration system using ammonia.
Explain working of reciprocating compressor with sketch.
How is motor selected for compressor?
Describe cold storage and its design factors.
What is air conditioning?
Effect of ventilation on cooling load.
Difference between multistage and cascade refrigeration.
Derive relation between effectiveness and NTU.
Section C
Section C contains long and advanced questions that require detailed calculations and analysis of refrigeration systems and optimization techniques. Students must solve numerical problems and explain simulation methods.
Example Questions from Section C:
Calculate COP and compressor work of ammonia refrigeration system.
Determine COP from vapour compression refrigeration test data.
Represent optimization problem mathematically.
State types of simulation techniques.
