Exam Details
| Subject | Refrigeration System | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2015 | |
| City, State | new delhi, |
Question Paper
1. Choose the correct answer from the given four alternatives:
Which of the following does not change during a throttling process?
Enthalpy
Entropy
Volume
Pressure
In an aircraft refrigeration system, the pressure at the cooling turbine outlet is equal to
ambient pressure
cabin pressure
pressure at compressor inlet
None of the above
In a refrigerator plant, if the condenser temperature increases, the power input to the compressor will
decrease
increase
remain the same
be unpredictable
In a vapour compression system, the working fluid is superheated vapour at entrance to
evaporator
condenser
compressor
expansion valve
When a liquid boils at constant pressure, the following parameter increases:
Temperature
Latent heat of vaporization
Kinetic energy
Entropy
In an ideal refrigeration (reversed Carnot) cycle, the condenser and evaporator temperature are 27°C and' -13°C respectively. The COP of this cycle would be
6·5
7·5
10·5
15·0
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
Carbon dioxide
Sulphur dioxide
Lithium bromide
Freon-12
Explain the working principle of vapour compression refrigeration system with the help of a block diagram.
What are the effects of chlorofluorocarbons (CFCs) on the environment? How do they affect the ozone layer?
Derive the expression for the maximum COP of a vapour absorption refrigeration system.
Determine the ideal COP of an absorption refrigeration system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively.
What is the difference between "Wet Compression" and "Dry Compression"?
Give the comparison between a vapour compression refrigeration system and vapour absorption refrigeration system.
5. A refrigerating system operates on the reversed Carnot cycle. The higher temperature of the refrigerant in the system is 35°C and the lower temperature is -15°C. The capacity is to be 12 tonnes. Neglect all losses.
Determine:
Coefficient of performance
Heat rejected from the system per hour
Power required
6. Define the COP of a refrigerator. What is a heat pump How does it differ from a refrigerator Also derive the relation of COP between Heat Pump and Refrigerator.
State and explain the Clausius' statement of the second law of thermodynamics.
Show that Integral dQ/T=0 for a reversible cycle.
8. Write short notes on any two of the following
Properties of refrigerants
Effect of superheating on the performance of vapour compression refrigeration system
Expansion valve
Defrosting
Which of the following does not change during a throttling process?
Enthalpy
Entropy
Volume
Pressure
In an aircraft refrigeration system, the pressure at the cooling turbine outlet is equal to
ambient pressure
cabin pressure
pressure at compressor inlet
None of the above
In a refrigerator plant, if the condenser temperature increases, the power input to the compressor will
decrease
increase
remain the same
be unpredictable
In a vapour compression system, the working fluid is superheated vapour at entrance to
evaporator
condenser
compressor
expansion valve
When a liquid boils at constant pressure, the following parameter increases:
Temperature
Latent heat of vaporization
Kinetic energy
Entropy
In an ideal refrigeration (reversed Carnot) cycle, the condenser and evaporator temperature are 27°C and' -13°C respectively. The COP of this cycle would be
6·5
7·5
10·5
15·0
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
Carbon dioxide
Sulphur dioxide
Lithium bromide
Freon-12
Explain the working principle of vapour compression refrigeration system with the help of a block diagram.
What are the effects of chlorofluorocarbons (CFCs) on the environment? How do they affect the ozone layer?
Derive the expression for the maximum COP of a vapour absorption refrigeration system.
Determine the ideal COP of an absorption refrigeration system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively.
What is the difference between "Wet Compression" and "Dry Compression"?
Give the comparison between a vapour compression refrigeration system and vapour absorption refrigeration system.
5. A refrigerating system operates on the reversed Carnot cycle. The higher temperature of the refrigerant in the system is 35°C and the lower temperature is -15°C. The capacity is to be 12 tonnes. Neglect all losses.
Determine:
Coefficient of performance
Heat rejected from the system per hour
Power required
6. Define the COP of a refrigerator. What is a heat pump How does it differ from a refrigerator Also derive the relation of COP between Heat Pump and Refrigerator.
State and explain the Clausius' statement of the second law of thermodynamics.
Show that Integral dQ/T=0 for a reversible cycle.
8. Write short notes on any two of the following
Properties of refrigerants
Effect of superheating on the performance of vapour compression refrigeration system
Expansion valve
Defrosting
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
- School of Computer and Information Sciences (SOCIS)
- School of Continuing Education (SOCE)
- School of Education (SOE)
- School of Engineering & Technology (SOET)
- School of Extension and Development Studies (SOEDS)
- School of Foreign Languages (SOFL)
- School of Gender Development Studies(SOGDS)
- School of Health Science (SOHS)
- School of Humanities (SOH)
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- School of Journalism and New Media Studies (SOJNMS)
- School of Law (SOL)
- School of Management Studies (SOMS)
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- School of Performing Arts and Visual Arts(SOPVA)
- School of Sciences (SOS)
- School of Social Sciences (SOSS)
- School of Social Work (SOSW)
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- School of Tourism &Hospitality Service Sectoral SOMS (SOTHSSM)
- School of Translation Studies and Training (SOTST)
- School of Vocational Education and Training (SOVET)
- Staff Training & Research in Distance Education (STRIDE)
Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.