Q-01 FDNY Questions And Revised Correct
Answers PASSED!!
Rupture .members, .when .used .in .parallel .with .a .relief .valve, .are .not .to .exceed ._____% .above
.designed .working .pressure .- .(correct .answer) .-20%
Butterfly .valve: .where .can .it .be .used? .- .(correct .answer) .-Can .be .used .on .the .inlet .and .outlet .of .a
.water .pump
What .electrical .motor .protection .device .automatically .resets .itself? .- .(correct .answer) .-The .thermal
.protector
746 .watts .equals .how .many .kilowatt .hours? .- .(correct .answer) .-.746 .kilowatt .hours
What .position .is .the .liquid .line .service .valve .normally .in? .- .(correct .answer) .-Back-seated
In .an .operating .evaporator, .oil .stays .on .top .of .which .refrigerant? .- .(correct .answer) .-Carbon .dioxide,
.R-744
At .what .pressure .does .the .relief .valve .blow .on .a .high .pressure .machine? .- .(correct .answer) .-300 .psi
,What .would .indicate .a .restriction .(such .as .dirt .or .scale) .in .the .liquid .line? .- .(correct .answer) .-Frost
.immediately .after .the .restriction
What .does .solubility .mean? .- .(correct .answer) .-The .ability .of .a .refrigerant .to .mix .with .other
.substances
Charging .Vapor .—In .a .compression .system, .where .do .you .charge .the .vapor? .- .(correct .answer) .-
Suction .side .of .the .compressor .at .the .Suction .Service .Valve
When .comparing .a .brine .with .s .PH .of .8 .to .one .with .a .PH .of .10, .its .alkalinity .is: .- .(correct .answer) .-
100 .times .greater .(ex. .PH .8 .to .PH .9 .is .10 .times .greater)
In .an .efficiently .operating .induced .draft .cooling .tower, .the .leaving .water .is .between: .- .(correct
.answer) .-Dry .bulb .and .wet .bulb .temperature
To .produce .the .desired .evaporator .temperature, .the .power .input .is .reduced .by .keeping .head
.pressure... .- .(correct .answer) .-Head .pressure .as .low .as .possible .& .suction .pressure .as .high .as
.needed
The .accumulator .is .usually .between .the... .- .(correct .answer) .-Compressor .and .evaporator
An .oiling .system .in .a .large .centrifugal .system .should .consist .of .at .least... .- .(correct .answer) .-
Reservoir, .pump .and .distribution .lines
In .an .evaporator .that .chills .brine, .the .greatest .cooling .effect .on .the .brine .results .from .the... .-
.(correct .answer) .-Boiling .of .low .pressure .liquid
The .flow .of .weak .liquor .to .the .absorber .is .controlled .by
A) .gas .pressure
,B) .throttling .device
C) .float .valve
D) .pressure .of .the .strong .liquor .pump .- .(correct .answer) .-B) .throttling .device
The .best .way .of .detecting .ammonia .brine .is .by .using
A) .CO2 .gas
B) .potassium .of .lime
C) .Nessler .reagent
D) .carbonate .of .soda .- .(correct .answer) .-C) .Nessler .reagent
The .best .time .to .purge .an .ammonia .plant .with .250 .lbs. .of .ammonia .is
A) .during .shut-down, .because .you .will .lose .ammonia
B) .while .charging .the .plant
C) .during .operation
D) .none .of .the .above .- .(correct .answer) .-C) .during .operation
What .will .make .the .strong .liquor .in .the .absorber .decrease?
A) .expansion .valve .open .too .much
B) .A .decrease .in .evaporator .load
C) .An .increase .in .evaporator .load
D) .Too .much .steam .on .the .generator .- .(correct .answer) .-B) .A .decrease .in .evaporator .load
Which .of .the .following .statements .is .incorrect?
A) .A .service .valve .is .a .key-operated .shut-off .valve .used .during .shipment, .installation .and .repairs
B) .Brine .is .a .liquid .cooled .by .refrigeration .and .used .for .the .transmission .of .heat
, C) .A .fusible .plug .has .a .set-temperature .fusible .member .to .relieve .pressure
D) .A .rupture .member .automatically .ruptures .at .a .predetermined .temperature .- .(correct .answer) .-D)
.A .rupture .member .automatically .ruptures .at .a .predetermined .temperature
Oil .in .a .refrigerant .should
A) .have .a .high .pour .point
B) .have .a .low .flash .point
C) .have .a .high .viscosity
D) .not .contain .moisture .- .(correct .answer) .-D) .not .contain .moisture
In .an .NH3 .dry .expansion .evaporator .with .TXV .and .bulb .clamped .properly .on .the .outlet .of .the
.evaporator, .the .superheat .is
A) .7 .to .10° .F
B) .5 .to .9° .F
C) .20 .to .30° .F
D) .1 .to .2° .F .- .(correct .answer) .-A) .7 .to .10° .F
The .setting .of .a .fusible .plug .is
A) .280° .F
B) .300° .F
C) .380° .F
D) .300 .psig. .- .(correct .answer) .-A) .280° .F
If .the .insulation .was .removed .from .the .bulb .of .the .expansion .valve, .what .would .happen? .- .(correct
.answer) .-Flooded .evaporator .—the .TXV .bulb .opens .in .a .range .from .45 .to .85° .F. .If .the .insulation
.was .removed, .the .bulb .would .sense .the .temperature .in .the .machine .room .and .keep .the .TXV .open,
.thus .flooding .the .evaporator.
Answers PASSED!!
Rupture .members, .when .used .in .parallel .with .a .relief .valve, .are .not .to .exceed ._____% .above
.designed .working .pressure .- .(correct .answer) .-20%
Butterfly .valve: .where .can .it .be .used? .- .(correct .answer) .-Can .be .used .on .the .inlet .and .outlet .of .a
.water .pump
What .electrical .motor .protection .device .automatically .resets .itself? .- .(correct .answer) .-The .thermal
.protector
746 .watts .equals .how .many .kilowatt .hours? .- .(correct .answer) .-.746 .kilowatt .hours
What .position .is .the .liquid .line .service .valve .normally .in? .- .(correct .answer) .-Back-seated
In .an .operating .evaporator, .oil .stays .on .top .of .which .refrigerant? .- .(correct .answer) .-Carbon .dioxide,
.R-744
At .what .pressure .does .the .relief .valve .blow .on .a .high .pressure .machine? .- .(correct .answer) .-300 .psi
,What .would .indicate .a .restriction .(such .as .dirt .or .scale) .in .the .liquid .line? .- .(correct .answer) .-Frost
.immediately .after .the .restriction
What .does .solubility .mean? .- .(correct .answer) .-The .ability .of .a .refrigerant .to .mix .with .other
.substances
Charging .Vapor .—In .a .compression .system, .where .do .you .charge .the .vapor? .- .(correct .answer) .-
Suction .side .of .the .compressor .at .the .Suction .Service .Valve
When .comparing .a .brine .with .s .PH .of .8 .to .one .with .a .PH .of .10, .its .alkalinity .is: .- .(correct .answer) .-
100 .times .greater .(ex. .PH .8 .to .PH .9 .is .10 .times .greater)
In .an .efficiently .operating .induced .draft .cooling .tower, .the .leaving .water .is .between: .- .(correct
.answer) .-Dry .bulb .and .wet .bulb .temperature
To .produce .the .desired .evaporator .temperature, .the .power .input .is .reduced .by .keeping .head
.pressure... .- .(correct .answer) .-Head .pressure .as .low .as .possible .& .suction .pressure .as .high .as
.needed
The .accumulator .is .usually .between .the... .- .(correct .answer) .-Compressor .and .evaporator
An .oiling .system .in .a .large .centrifugal .system .should .consist .of .at .least... .- .(correct .answer) .-
Reservoir, .pump .and .distribution .lines
In .an .evaporator .that .chills .brine, .the .greatest .cooling .effect .on .the .brine .results .from .the... .-
.(correct .answer) .-Boiling .of .low .pressure .liquid
The .flow .of .weak .liquor .to .the .absorber .is .controlled .by
A) .gas .pressure
,B) .throttling .device
C) .float .valve
D) .pressure .of .the .strong .liquor .pump .- .(correct .answer) .-B) .throttling .device
The .best .way .of .detecting .ammonia .brine .is .by .using
A) .CO2 .gas
B) .potassium .of .lime
C) .Nessler .reagent
D) .carbonate .of .soda .- .(correct .answer) .-C) .Nessler .reagent
The .best .time .to .purge .an .ammonia .plant .with .250 .lbs. .of .ammonia .is
A) .during .shut-down, .because .you .will .lose .ammonia
B) .while .charging .the .plant
C) .during .operation
D) .none .of .the .above .- .(correct .answer) .-C) .during .operation
What .will .make .the .strong .liquor .in .the .absorber .decrease?
A) .expansion .valve .open .too .much
B) .A .decrease .in .evaporator .load
C) .An .increase .in .evaporator .load
D) .Too .much .steam .on .the .generator .- .(correct .answer) .-B) .A .decrease .in .evaporator .load
Which .of .the .following .statements .is .incorrect?
A) .A .service .valve .is .a .key-operated .shut-off .valve .used .during .shipment, .installation .and .repairs
B) .Brine .is .a .liquid .cooled .by .refrigeration .and .used .for .the .transmission .of .heat
, C) .A .fusible .plug .has .a .set-temperature .fusible .member .to .relieve .pressure
D) .A .rupture .member .automatically .ruptures .at .a .predetermined .temperature .- .(correct .answer) .-D)
.A .rupture .member .automatically .ruptures .at .a .predetermined .temperature
Oil .in .a .refrigerant .should
A) .have .a .high .pour .point
B) .have .a .low .flash .point
C) .have .a .high .viscosity
D) .not .contain .moisture .- .(correct .answer) .-D) .not .contain .moisture
In .an .NH3 .dry .expansion .evaporator .with .TXV .and .bulb .clamped .properly .on .the .outlet .of .the
.evaporator, .the .superheat .is
A) .7 .to .10° .F
B) .5 .to .9° .F
C) .20 .to .30° .F
D) .1 .to .2° .F .- .(correct .answer) .-A) .7 .to .10° .F
The .setting .of .a .fusible .plug .is
A) .280° .F
B) .300° .F
C) .380° .F
D) .300 .psig. .- .(correct .answer) .-A) .280° .F
If .the .insulation .was .removed .from .the .bulb .of .the .expansion .valve, .what .would .happen? .- .(correct
.answer) .-Flooded .evaporator .—the .TXV .bulb .opens .in .a .range .from .45 .to .85° .F. .If .the .insulation
.was .removed, .the .bulb .would .sense .the .temperature .in .the .machine .room .and .keep .the .TXV .open,
.thus .flooding .the .evaporator.
