1. The efficiency of the refrigerant cycle is affected by Lowering the con-
the operation of the condenser. Of the following, a denser pressure
more efficient centrifugal compressor operation re-
sults from
2. In most semi hermetic compressors, the suction va- Cool's the motor
por is used too
3. The amount of refrigerant that flows through the ori- Difference be-
fices of an economizer is determined by the tween the high
side and the low
side pressure
4. the instalation of an inline refrigerant cleaning sys- to remove impuri-
tem is advisable ties from the sys-
tem
5. a refrigerant engineer verifies that a condenser pump a faulty cooling
is cavitating of the following the most likely cause for tower water level
this condition is: controller
6. when an expansion valve is operating properly, at the only superheated
end of the evaporator will contain vapor
7. a centrifugal water pump is considered to be fully the pump is full of
primed when liquid
8. A refrigeration compressor has failed to turn on. the temperature and
engineer on duty verifies the electrical circuit to the pressure controls
motor, including all switches and circuit breakers is
complete, according to recomended service practice,
the next item to be checked would likely be the:
9. Refrigerants are characterized by their physical prop- ammonia
erties including Flashpoint, refrigeration effect and
others, of the refrigerants in commercial and indus-
trial the highest latent heat and refrigerant effect is:
10. which of the following ashrae refrigerant safety clas- B3
sification which is most toxic
, FDNY Z-51
11. which of the following ashrae refrigerant safety clas- A3
sification is the most flammable
12. in q indirect refrigeration system,of the following, the r-22 (cooling
one that would not be used as a cooling medium for medium= glycol or
building spaces being cooled is any brine solution)
13. the primary way of achieving capacity control of a an adjustment of
centrifugal compressor is by: the inlet im-
peller pre-rotation-
al vanes
14. regarding the functioning of a steam turbine, why is it keeps turbine
advisable to keep moisture in the inlet low as possible blades wear to
minimum
15. a water chiller is equipped with a reciprocating com- high suction super
pressor, a thermostatic expansion valve and a an air heat
cooled condenser. A restriction in the refrigerant line
would result in
16. the process by which refrigerant is extracted and recycle
cleaned for reuse without requirements for reclama-
tion is called
17. the purpose of wear rings in a centrifugal pump is to prevent wearing of
the pump housing
and impeller
18. a centrifugal compressor is in operation with suction 1.39
pressure is 3 psig and the discharge is 10psi what is Ratio= discharge
the atmospheric pressure is 14.7 which is the ratio pressure ((PSIA ÷
closest to Sucction Pressure
PSIA÷ PSIA
19. electrical current is measured in amperes
20. how would you put an additional pump online open suction
valve, open dis-
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