ESCO A-C Exam (1) all questions and answers

ESCO A-C

EXAM

,• heat which causes a change in temperature of a

substance is calledANSWER sensible heat

• Heat added to a substance without a rise in

temperatureANSWER latent heat of vaporization

• Heat added to the refrigerant in a vapor state after the

evaporation process is calledANSWER superheat

• scroll compressor move refrigerant byANSWER involute

spirals

• the movement of heat by way of fluid is calledANSWER

convection

• the movement of heat by direct contact isANSWER

conduction

• the standard unit for measuring the quantity of heat in a

substance isANSWER btu

• refrigerant gives up heat whenANSWER it condenses

, • why must refrigerant in the suction line be slightly

warmer than the satura- tion temperature?ANSWER

prevent liquid slugging of the compressor

• the state of the refrigerant in the suction line should

beANSWER low pressure / low temperature vapor

• the state of the refrigerant entering the condenser

isANSWER high pressure / highly superheated vaoor

• the evaporatorANSWER Transfers heat from the

refrigerated space to the refrigerant

• which of the following is not a thermodynamic property

of refrigerantsANSWER -

flammability

• The sequential order of steps in the vapor

compressions process areANSWER com- pression,

condensation, expansion, vaporization