THEORY EXAMINATION (SEM–VIII) 2016-17 DESIGN OF THERMAL SYSTEM
Section A
Section A contains short questions that test basic concepts of refrigeration, compressors, heat exchangers, and air conditioning processes. Students need to write brief definitions and explain fundamental terms related to thermal system design.
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 compressors.
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 the selection factors of heat exchangers?
Section B
Section B contains medium-length questions that require explanation of refrigeration system design, compressors, cold storage, and air conditioning processes. Students must explain working principles, design considerations, and engineering calculations.
Example Questions from Section B:
Classify internal and system heat gain.
Design a 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 infiltration on cooling load.
Difference between multistage and cascade refrigeration.
Derive relationship between effectiveness and NTU.
Section C
Section C contains long and advanced questions that require detailed numerical calculations and analysis of refrigeration systems and optimization techniques. Students must solve complex thermal engineering problems.
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.
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