26) Pick up the wrong statement. A refrigerant should have

High latent heat of vaporization

High boiling point

Low specific heat of liquid

Higher critical temperature

Answer is:

High boiling point

ISRO Technician-B MRAC Question Paper - 2016 (Set -1) with Answer Key

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27) In aircraft, air refrigeration cycle is used because of

Higher coefficient of performance

Low temperature at high altitudes

High heat transfer rate

Low weight of system per kg of refrigerant

Answer is:

Low weight of system per kg of refrigerant

28) The evaporator changes the low pressure liquid refrigerant from the expansion valve into

Low pressure liquid and vapour refrigerant

Low pressure vapour refrigerant

High pressure liquid refrigerant

None of these

Answer is:

Low pressure vapour refrigerant

29) Environmental protection agencies advice against the use of chloroflurocarbon refrigerants sinc

These react with water vapour and cause acid rain

These react with oxygen and cause its depletion

These react with plants and cause greenhouse effect

These react with ozone layer

Answer is:

These react with ozone layer

30) The COP of a heat pump working on a reversed Carnot cycle is

T1/(T2-T1)

T2/(T2-T1)

(T1-T2)/T1

(T2-T1)/T1

Answer is:

T2/(T2-T1)

ISRO Technician-B MRAC Question Paper - 2016 (Set -1) with Answer Key

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26) Pick up the wrong statement. A refrigerant should have

High boiling point

ISRO Technician-B MRAC Question Paper - 2016 (Set -1) with Answer Key

Related ISRO Technician-B MRAC Question Paper - 2016 (Set -1) with Answer Key

27) In aircraft, air refrigeration cycle is used because of

Low weight of system per kg of refrigerant

28) The evaporator changes the low pressure liquid refrigerant from the expansion valve into

Low pressure vapour refrigerant

29) Environmental protection agencies advice against the use of chloroflurocarbon refrigerants sinc

These react with ozone layer

30) The COP of a heat pump working on a reversed Carnot cycle is

T2/(T2-T1)

ISRO Technician-B MRAC Question Paper - 2016 (Set -1) with Answer Key