CSN AC 110 Esco Exam | 100% Correct
Answers | Verified | Latest 2024 Version
1. Heat which causes a change in temperature of a substance is called;
A. latent heat
B. sensible heat
C. superheat
D. radiant heat - ✔✔B. sensible heat
2. Heat added to a substance without a raise in temperature; (example: liquid refrigerant to gas) this
process is called?
A. latent heat of vaporization
B. latent heat of fusion.
C. superheat of vaporization
D. superheat of fusion - ✔✔A. latent heat of vaporization
3. Heat added to the refrigerant in a vapor state after the evaporation process is called;
A. latent heat
B. subcooling
C. superheat
D. specific heat - ✔✔C. superheat
4. A scroll compressor move refrigerant by means of;
A. a piston
B. an impeller
C. vane and cam
D. involute spirals - ✔✔D. involute spirals
,5. The movement of heat by way of fluid (or air) is called;
A. conduction
B. convection
C. radiation
D. percussion - ✔✔B. convection
6. The movement of heat through a solid object is called;
A. conduction
B. convection
C. radiation
D. compression - ✔✔A. conduction
7. The standard unit for measuring the quantity of heat in a substance is;
A. degrees Fahrenheit
B. degrees Celsius
C. degrees Rankin
D. the British Thermal Unit (Btu) - ✔✔D. the British Thermal Unit (Btu)
8. A refrigerant gives up heat when;
A. it condenses
B. it evaporates
C. it is compressed
D. it vaporizes - ✔✔A. it condenses
9. Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
A. prevent liquid slugging of hte compressor
B. prevent refrigerant vapor lock
C. prevent the compressor from overheating
, D. prevent oil miscibility - ✔✔A. prevent liquid slugging of the compressor
10. The state of the refrigerant in the suction line should be;
A. high pressure / high temperature liquid
B high pressure / low temperature vapor
C. low pressure / low temperature liquid
D. low pressure / low temperature vapor - ✔✔D. low pressure / low temperature vapor
11. The state of the refrigerant entering the condenser is;
A. high temperature / highly superheated liquid
B. high pressure / highly superheated vapor
C. high pressure / high temperature liquid
D. low pressure / low temperature vapor - ✔✔B. high pressure / highly superheated vapor
12. the evaporator;
A. transfers heat from the refrigerated space to the refrigerant
B. transfers heat from the refrigerant to the refrigerated space
C. transfers heat from the refrigerant to the ambient air
D. transfers heat from the ambient air to the refrigerated space - ✔✔A. transfers heat from the
refrigerated space to the refrigerant
13. Which of the following is not a thermodynamic property of refrigerants?
A. critical point
B. saturation point
C. enthalpy
D. flammability - ✔✔D. flammability
14. The sequential order of steps in the vapor - compression process are;
A. expansion, condensation, compression, vaporization
Answers | Verified | Latest 2024 Version
1. Heat which causes a change in temperature of a substance is called;
A. latent heat
B. sensible heat
C. superheat
D. radiant heat - ✔✔B. sensible heat
2. Heat added to a substance without a raise in temperature; (example: liquid refrigerant to gas) this
process is called?
A. latent heat of vaporization
B. latent heat of fusion.
C. superheat of vaporization
D. superheat of fusion - ✔✔A. latent heat of vaporization
3. Heat added to the refrigerant in a vapor state after the evaporation process is called;
A. latent heat
B. subcooling
C. superheat
D. specific heat - ✔✔C. superheat
4. A scroll compressor move refrigerant by means of;
A. a piston
B. an impeller
C. vane and cam
D. involute spirals - ✔✔D. involute spirals
,5. The movement of heat by way of fluid (or air) is called;
A. conduction
B. convection
C. radiation
D. percussion - ✔✔B. convection
6. The movement of heat through a solid object is called;
A. conduction
B. convection
C. radiation
D. compression - ✔✔A. conduction
7. The standard unit for measuring the quantity of heat in a substance is;
A. degrees Fahrenheit
B. degrees Celsius
C. degrees Rankin
D. the British Thermal Unit (Btu) - ✔✔D. the British Thermal Unit (Btu)
8. A refrigerant gives up heat when;
A. it condenses
B. it evaporates
C. it is compressed
D. it vaporizes - ✔✔A. it condenses
9. Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
A. prevent liquid slugging of hte compressor
B. prevent refrigerant vapor lock
C. prevent the compressor from overheating
, D. prevent oil miscibility - ✔✔A. prevent liquid slugging of the compressor
10. The state of the refrigerant in the suction line should be;
A. high pressure / high temperature liquid
B high pressure / low temperature vapor
C. low pressure / low temperature liquid
D. low pressure / low temperature vapor - ✔✔D. low pressure / low temperature vapor
11. The state of the refrigerant entering the condenser is;
A. high temperature / highly superheated liquid
B. high pressure / highly superheated vapor
C. high pressure / high temperature liquid
D. low pressure / low temperature vapor - ✔✔B. high pressure / highly superheated vapor
12. the evaporator;
A. transfers heat from the refrigerated space to the refrigerant
B. transfers heat from the refrigerant to the refrigerated space
C. transfers heat from the refrigerant to the ambient air
D. transfers heat from the ambient air to the refrigerated space - ✔✔A. transfers heat from the
refrigerated space to the refrigerant
13. Which of the following is not a thermodynamic property of refrigerants?
A. critical point
B. saturation point
C. enthalpy
D. flammability - ✔✔D. flammability
14. The sequential order of steps in the vapor - compression process are;
A. expansion, condensation, compression, vaporization
