CSN
AC
/
110
/
Esco
/
Exam
/
Practice Questions With Correct Answers
/ / / / /
1. /Heat /which /causes /a /change /in /temperature /of /a /substance /is /called;
A. /latent /heat
B. /sensible /heat
C. /superheat
D. /radiant /heat /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /C. /superheat
4. /A /scroll /compressor /move /refrigerant /by /means /of;
A. /a /piston
B. /an /impeller
C. /vane /and /cam
D. /involute /spirals /- /correct /answer(s) /✔✔ /D. /involute /spirals
5. /The /movement /of /heat /by /way /of /fluid /(or /air) /is /called;
A. /conduction
B. /convection
C. /radiation
D. /percussion /- /correct /answer(s) /✔✔ /B. /convection
6. /The /movement /of /heat /through /a /solid /object /is /called;
A. /conduction
B. /convection
C. /radiation
D. /compression /- /correct /answer(s) /✔✔ /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) /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /-
/correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /D. /flammability
AC
/
110
/
Esco
/
Exam
/
Practice Questions With Correct Answers
/ / / / /
1. /Heat /which /causes /a /change /in /temperature /of /a /substance /is /called;
A. /latent /heat
B. /sensible /heat
C. /superheat
D. /radiant /heat /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /C. /superheat
4. /A /scroll /compressor /move /refrigerant /by /means /of;
A. /a /piston
B. /an /impeller
C. /vane /and /cam
D. /involute /spirals /- /correct /answer(s) /✔✔ /D. /involute /spirals
5. /The /movement /of /heat /by /way /of /fluid /(or /air) /is /called;
A. /conduction
B. /convection
C. /radiation
D. /percussion /- /correct /answer(s) /✔✔ /B. /convection
6. /The /movement /of /heat /through /a /solid /object /is /called;
A. /conduction
B. /convection
C. /radiation
D. /compression /- /correct /answer(s) /✔✔ /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) /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /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 /-
/correct /answer(s) /✔✔ /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 /- /correct /answer(s) /✔✔ /D. /flammability
