ESCO Light Commercial Refrigeration EXAM with Complete Solutions

ESCO Light Commercial Refrigeration EXAM 2024/2025
with Complete Solutions.




In .a .dry .type .
(direct .expansion) .evaporator, .liquid .refrigerant .must .boil .away .as .close .to .the .end .of .the .coil .as .po
ssible .in .order .to:

A. .operate .at .high .efficiency.

B. .ensure .that .frost .does .not .accumulate.

C. .sub-cool .the .compressor.

D. .ensure .proper .oil .return. .- .(correct .answer) .-A. .operate .at .high .efficiency.

The .difference .between .the .temperature .of .the .refrigerant .boiling .in .the .evaporator .and .the .temper
ature .at .the .evaporator .outlet .is .known .as:

A. .evaporator .superheat.

B. .latent .heat.

C. .evaporator .sub-cooling.

D. .sublimation. .- .(correct .answer) .-A. .evaporator .superheat.

An .expansion .device .that .is .stuck .open .will .cause:

A. .low .suction .pressure

B. .a .starved .evaporator.

C. .excessive .superheat

D. .a .flooded .evaporator .- .(correct .answer) .-D. .a .flooded .evaporator

,When .measuring .evaporator .superheat .on .a .commercial .system .that .has .a .long .suction .line, .the .pre
ssure .reading .should .be .taken .at .the:

A. .compressor .inlet.

B. .evaporator .outlet.

C. .condenser .outlet.

D. .receiver .Inlet. .- .(correct .answer) .-A. .compressor .inlet. .(Suction .Line)

Superheat .measurements .are .best .taken:

A. .during .a .hot .pull .down.

B. .at .8°F .to .12°F.

C. .during .defrost.

D. .with .the .system .operating .at .design .conditions. .- .(correct .answer) .-
D. .with .the .system .operating .at .design .conditions.

A .technician .is .checking .the .superheat .on .a .multi .circuit .evaporator .and .finds .one .of .the .circuits .ha
s .a .superheat .that .is .higher .than .the .others. .This .could .be .caused .by:

A. .a .dirty .coil.

B. .a .refrigerant .overcharge

C. .uneven .air .distribution.

D. .a .blocked .distributor. .- .(correct .answer) .-D. .a .blocked .distributor.

A .TEV .with .an .external .equalizer .is .used .on:

A. .evaporators .with .a .high .pressure .drop.

B. .evaporators .with .a .low .pressure .drop.

C. .high .temperature .applications .only.

D. .all .evaporators. .- .(correct .answer) .-A. .evaporators .with .a .high .pressure .drop.

Dry .type .evaporators .operate .most .efficiently .with .a .superheat .setting .of .approximately:

A. .8° .F .to .12°F

B. .13° .F .to .19°F

C. .20° .F .to .30°F

, D. .31° .F .to .40° .F .- .(correct .answer) .-A. .8° .F .to .12°F

An .evaporator .used .to .chill .liquids .in .operating .with .a .normal .superheat .setting, .but .the .system .is .n
ot .cooling .the .product .properly. .Which .of .the .following .is .the .most .likely .cause?

A. .overcharge .of .refrigerant

B. .undercharge .of .refrigerant

C. .the .circulator

D. .the .TEV .- .(correct .answer) .-C. .the .circulator

What .time .interval .is .required .between .each .superheat .adjustment?

A. .Not .less .than .1 .hour

B. .About .10-15 .minutes

C. .At .least .1/2 .hour.

D. .No .time .delay. .- .(correct .answer) .-B. .About .10-15 .minutes

A .low .temperature .evaporator .used .for .cooling .space .or .product .refrigeration:

A. .is .the .same .as .one .used .for .medium .or .high .temperatures.

B. .must .have .fins .spaced .closer .together.

C. .must .be .frosted .periodically.

D. .must .be .defrosted .periodically. .- .(correct .answer) .-D. .must .be .defrosted .periodically.

Some .special .applications .use .a .flooded .evaporator .
(operated .full .of .refrigerant). .In .order .to .maintain .the .proper .level .of .liquid .refrigerant, .a .____ .type
.metering .device .is .used.


A. .TEV .

B. .capillary .tube

C. .AEV

D. .float .- .(correct .answer) .-D. .float

A .properly .functioning .condenser .will .first:

A. .condense .then .de-superheat.

B. .subcool .then .de-superheat.