1. Select the correct answer from the given four alternatives for the following questions:

CHClF2 is the chemical formula for

Refrigerant R22

Refrigerant R12

CO2

Ammonia

Heat pump delivers heat from

Lower temperature to higher temperature

Higher temperature to lower temperature

Both and

None of the above

A heat engine working on the Carnot cycle is

Less efficient

Moderately efficient

Highly efficient

Not efficient

The C.O.P. of Carnot refrigerator is

T1/T1 -T2

T1/T2 -T1

T2/T2 -T1

T2/T1 -T2

During sensible coding, wet bulb temperature

Decreases

Increases

Remains constant

Can decrease or increase

One Ton ofRefrigeration is equal to

200 Btu/min

50 kCallmin

3·5 kW

All of the above

Water and brine solutions are examples of

Primary refrigerants

Secondary refrigerants

None of the above

Both and

What are the different types of condensers used in a refrigeration system Explain the working of any condenser.

What are the different types of evaporators? Explain in short anyone type of evaporator.

With the help of a psychrometric chart, distinguish between specific humidity and relative humidity.

Describe the different steps in food preservation.

40,000 kg/day of fish is to be frozen to -35°C. The fish enters at 35°C. Calculate the refrigeration duty of the plant for 20 hours running time.
Given:
Specific heat of fish 3·77 kJ/kg°C,
Latent heat of fusion offish =251·2 kJ/kg,
Specific heat of frozen fish =1·67 kJ/kg°C.

State the factors which should be taken into consideration while selecting a system of air-conditioning.

The coefficient of performance of a Carnot refrigerator, when it extracts 8350 kJ/min from a heat source, is 5. Find the power required to run the compressor.

Differentiate clearly between open and closed air refrigeration system.

Sketch a vapour absorption refrigeration cycle and mark necessary components.

Differentiate between centrifugal and rotary compressors. Also state their applications.