Exam Details
| Subject | Refrigeration & Air-Conditioning | |
| Paper | ||
| Exam / Course | Diploma in Civil Engineering (DCLE) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
1. Select the correct answer from the given four alternatives for the following questions:
The coefficient of performance of a refrigerator working on Carnot cycle is
T1 -T2 /T1
T1-T2/T2
T2
T1
where T1 and T2 are the highest and lowest operating temperatures in the cycle.
In a one ton capacity water cooler, water enters at 30°C at the rate of 200 litres per hour. Taking specific heat of water at 4.16 kJ/kg the outlet temperature of water will be
3.5°C
6.3°C
23.7°C
15°C
An ideal refrigerator is operating between a condenser temperature of -37°C and an evaporator temperature of -3°C. If the machine is functioning as a heat pump, its coefficient of performance will be
6.00
6.75
7.75
8.75
Air refrigeration cycle is generally employed in
Domestic refrigerators
Commercial refrigerators
Air-conditioning
Gas liquefaction
On a psychrometric chart, the constant wet bulb temperature lines coincide with
constant relative humidity lines
constant enthalpy lines
constant dew point temperature lines
constant volume lines
Effective temperature depends upon dry bulb temperature and
wet bulb temperature
relative humidity
specific humidity
wet bulb temperature and air motion
In a window air-conditioner, the expansion device used is
capillary tube
thermostatic expansion valve
float valve
automatic expansion valve
Explain the concepts of food freezing, storage conditions and distribution.
What are the various factors which contribute to food spoilage? List the causes of food spoilage.
Sketch a vapour absorption refrigeration cycle and mark its necessary components.
Differentiate between centrifugal and rotary compressors. Also state their applications.
What are the different types of condensers used in a refrigeration system Explain the working of anyone condenser.
What are the different types of evaporators Explain anyone type of evaporator.
With the help of a psychrometric chart, distinguish between specific humidity and relative humidity.
State the factors considered while selecting an air-conditioning system.
A refrigeration system produces 40 kg/hr of ice at 0°C from water at 26°C. Find the refrigeration effect per hour and TR. If it consumes 1.25 kW of energy to produce the ice, find the COP. Take latent heat of solidification of water at O°C as 335 kJ/kg and specific heat of water as 4·19 kJ/kg °C.
Describe the desirable thermodynamic properties of refrigerants.
The coefficient of performance of a refrigerator working on Carnot cycle is
T1 -T2 /T1
T1-T2/T2
T2
T1
where T1 and T2 are the highest and lowest operating temperatures in the cycle.
In a one ton capacity water cooler, water enters at 30°C at the rate of 200 litres per hour. Taking specific heat of water at 4.16 kJ/kg the outlet temperature of water will be
3.5°C
6.3°C
23.7°C
15°C
An ideal refrigerator is operating between a condenser temperature of -37°C and an evaporator temperature of -3°C. If the machine is functioning as a heat pump, its coefficient of performance will be
6.00
6.75
7.75
8.75
Air refrigeration cycle is generally employed in
Domestic refrigerators
Commercial refrigerators
Air-conditioning
Gas liquefaction
On a psychrometric chart, the constant wet bulb temperature lines coincide with
constant relative humidity lines
constant enthalpy lines
constant dew point temperature lines
constant volume lines
Effective temperature depends upon dry bulb temperature and
wet bulb temperature
relative humidity
specific humidity
wet bulb temperature and air motion
In a window air-conditioner, the expansion device used is
capillary tube
thermostatic expansion valve
float valve
automatic expansion valve
Explain the concepts of food freezing, storage conditions and distribution.
What are the various factors which contribute to food spoilage? List the causes of food spoilage.
Sketch a vapour absorption refrigeration cycle and mark its necessary components.
Differentiate between centrifugal and rotary compressors. Also state their applications.
What are the different types of condensers used in a refrigeration system Explain the working of anyone condenser.
What are the different types of evaporators Explain anyone type of evaporator.
With the help of a psychrometric chart, distinguish between specific humidity and relative humidity.
State the factors considered while selecting an air-conditioning system.
A refrigeration system produces 40 kg/hr of ice at 0°C from water at 26°C. Find the refrigeration effect per hour and TR. If it consumes 1.25 kW of energy to produce the ice, find the COP. Take latent heat of solidification of water at O°C as 335 kJ/kg and specific heat of water as 4·19 kJ/kg °C.
Describe the desirable thermodynamic properties of refrigerants.
Other Question Papers
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