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Absorption system normally uses the following refrigerant.
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Latest Refrigeration & Air Conditioning Multiple Questions MCQ’s Quiz Online
One of the purposes of sub-cooling the liquid refrigerant is to _____.
- Reduce compressor overheating reduce
- Compressor discharge temperature
- Increase cooling effect
- Ensure that only liquid and not the vapour enters the expansion (throttling) valve
The value of COP in vapour compression cycle is usually
- Always less than unity
- Always more than unity
- Equal to unity
- Any one of the above
In a refrigeration system, heat absorbed in comparison to heat rejected is _____.
- More for small capacity and less for high capacity
Condensing temperature in a refrigerator is the temperature
- Of cooling medium
- Of freezing zone
- Of evaporator
- At which refrigerant gas becomes liquid
Formation of frost on evaporator in refrigerator
- Can be avoided by proper design
- Is immaterial
- increases heat transfer rate
- Results in loss of heat due to poor heat transfer
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be _____.
- High, of the order of 25°
- As low as possible (3 to 11°C)
- Any value
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to ______.
- Collect liquid refrigerant and prevent it from going to compressor
- Detect liquid in vapour
- Superheat the vapour
- Collect vapours
Accumulators should have adequate volume to store refrigerant charge at least _____.
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
- Remains same
- Depends on other factors
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be _____.
Which of the following is not a desirable property of a refrigerant
- High triiscibility with oil
- Low boiling point
- Good electrical conductor
- Large latent heat
In vapour compression refrigeration system, refrigerant occurs as liquid between
- Condenser and expansion valve
- Compressor and evaporator
- Expansion valve and evaporator
- Compressor and condenser
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system
- Strong solution to weak solution
- Weak solution to strong solution
- Strong solution to ammonia vapour
- Ammonia vapour to weak solution
Efficiency of a Cornot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle
Highest pressure encountered in a refrigeration system should be ______.
- Critical pressure of refrigerant
- Much below critical pressure
- Much above critical pressure
- Near critical pressure
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be ______.
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is _____.
- Carbon dioxide
Aqua ammonia is used as refrigerant in the following type of refrigeration system
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. Of compressor required will be _____.
- More/less depending on rating