Online Refrigeration & Air Conditioning MCQ’s Quiz

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The absorption system normally uses the following refrigerant. 

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Latest Refrigeration & Air Conditioning Multiple Questions MCQ’s Quiz Online

1. Freon-11
2. Freon-22
3. C02
4. Ammonia

One of the purposes of sub-cooling the liquid refrigerant is to _____.

1. Reduce compressor overheating and reduce
2. Compressor discharge temperature
3. Increase cooling effect
4. Ensure that only liquid and not vapour enters the expansion (throttling) valve

The value of COP in the vapour compression cycle is usually

1. Always less than unity
2. Always more than unity
3. Equal to unity
4. Any one of the above

In a refrigeration system, heat absorbed in comparison to heat rejected is _____.

1. More
2. Less
3. Same
4. More for small capacity and less for high capacity

Condensing temperature in a refrigerator is the temperature

1. Of cooling medium
2. Of freezing zone
3. Of evaporator
4. At which refrigerant gas becomes liquid

Formation of frost on evaporator in refrigerator

1. Can be avoided by proper design
2. Is immaterial
3. increases heat transfer rate
4. 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 _____.

1. High, of the order of 25°
2. As low as possible (3 to 11°C)
3. Zero
4. Any value

In a flooded evaporator refrigerator, an accumulator at the suction of the compressor is used to ______.

1. Collect liquid refrigerant and prevent it from going to the compressor
2. Detect liquid in vapour
3. Superheat the vapour
4. Collect vapours

Accumulators should have adequate volume to store refrigerant charge at least _____.

1. 10%
2. 25%
3. 50%
4. 75%

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

1. Decreases
2. Increases
3. Remains same
4. Depends on other factors

A refrigeration cycle operates between a condenser temperature of + 27°C and an evaporator temperature of- 23°C. The Cannot coefficient of performance of the cycle will be _____.

1. 0.2
2. 1.2
3. 5
4. 6

Which of the following is not a desirable property of a refrigerant

1. High triiscibility with oil
2. Low boiling point
3. Good electrical conductor
4. Large latent heat

In vapour compression refrigeration system, refrigerant occurs as liquid between

1. Condenser and expansion valve
2. Compressor and evaporator
3. Expansion valve and evaporator
4. Compressor and condenser

Pick up the correct statement about giving up of heat from one medium to another in the ammonia absorption system

1. Strong solution to weak solution
2. Weak solution to strong solution
3. The strong solution to ammonia vapour
4. Ammonia vapour to a weak solution

The efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle

1. 1.25
2. 0.8
3. 0.5
4. 0.25

The highest pressure encountered in a refrigeration system should be ______.

1. Critical pressure of the refrigerant
2. Much below the critical pressure
3. Much above the critical pressure
4. Near critical pressure

If a heat pump cycle operates between the condenser temperature of +27°C and the evaporator temperature of – 23°C, then the Carnot COP will be ______.

1. 0.2
2. 1.2
3. 5
4. 6

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 _____.

1. Ammonia
2. Carbon dioxide
3. Freon
4. Brine

Aqua ammonia is used as a refrigerant in the following type of refrigeration system

1. Compression
2. Direct
3. Indirect
4. Absorption

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. Of compressor required will be _____.

1. Same
2. More
3. Less
4. More/less depending on the rating