B insufficient refrigerant c air in the system d

B. Insufficient refrigerant
C. Air in the system
D. Stuck discharge valve
Answer: B
240. Which of the following
characteristics that a desirable in
a refrigerant?
A. Low latent heat fusion
B. High latent heat
vaporization
C. Low latent heat od vaporization
D. A or C
Answer: C
of
241. The principle of the centrifugal
system is based on which of the
following?
D. Boyle’s law
Answer: A
242. The temperature in the vegetable
box should be approximately
243. The compressor will run
continuously if there is
244. A “Direct” refrigeration system
is come in which
A. Ice is used for cooling
B. A secondary coolant is pumped
through the evaporator coils
C. The refrigerant passes through
coils in the evaporator
D. Any of the above
Answer: C
245. A “CARRENE” is a type of :

246. What is the first step that must
be done when securing a system?
247. When securing a Freon – 12
system for repairs
Answer: A
248. The most common reason for the
small usage of CO
2
system is :
249. To increase heat transfer in the
evaporator
250. When the compressor Is operated
in short spurts after a lay-up or
overhaul the purpose is to :