quiz sami

In a vapor compression refrigeration system the evaporator is in the

• System high pressure side.

• System low pressure side

• Between high and low side

• Both A and B

• Both B and C

In a vapor compression refrigeration system the refrigerant exits from evaporator at

• Low pressure liquid plus vapor

• Low pressure vapor

• Low pressure liquid

• High pressure liquid

• High pressure vapor

In the air-cooled condenser

• The refrigerant inside the tubes and the air outside the tubes

• The air inside the tubes and the refrigerant outside the tubes

• The air and the refrigerant outside the tubes

• The air and the refrigerant inside the tubes

• None of these

Q5 In refrigeration system the collecting of non-condensable gases inside the condenser will be

• Increasing the system capacity.

• reduce the condensing surface area

• Increasing the power required for compression process.

• Both A and B

• Both B and C

Q6 In the air cooled condenser, when using fins, the ……… in the air-side will be decreased

• Heat transfer resistance

• area

• rate of heat transfer

• heat-transfer coefficient

• All of these

The processes that occur in the condensers of vapor compression cycle are

• Superheating, condensing, subcooling

• superheating, evaporating, subcooling

• De-superheating, condensing, subcooling.

• Superheating, evaporating, compression

• De-superheating, evaporating, subcooling

In the vapor compression refrigeration system the condensation is a process of

• Changing the refrigerant state from liquid to gas

• Changing the refrigerant state from gas to liquid

• Increasing the refrigerant gas pressure

• None of these

• All of these

The evaporator generally used in home freezers ice cream cabinets etc. is

• plate evaporator

• finned evaporator

• Double pipe evaporator

• shell and tube evaporator

• shell and coil evaporator

Compute the rate of rate of heat rejected at condenser assume rate of heat evaporator 80 kw and heat-rejection ratio is 1.27

• 105.6

• 104.6

• 103.6

• 102.6

• 101.6

air cooled evaporator can be classified to three more categories, which one of the following is incorrect?

• Plate type

• Fined tube

• Shell-and-tubes type

• Both A and B

• Both B and C