CIRO OP 2 Questions and Answers Rated 100%
Correct
1. What was the main disadvantage of hand
C. They did not
expansion valves in early refrigeration
automat- ically adjust
systems
to changing loads so
A. They were big and bulky
an operator had to
B. They always required service because
frequently check and
they had many moving parts
adjust them
C.They did not automatically adjust to changing
loads so an operator had to frequently check
and adjust them
2. What is the advantage of a thermostatic
A. They will
expansion valve
automatical- ly adjust
themselves to
A. They will automatically adjust themselves to match match varying
load condi-
varying load conditions tions
B. They create fully wetted coil surface with coil
capac- ity equal to a gravity flooded system
C. They can be used on gravity, flooded,
recirculated over-feed and DX systems
D. One size fits all evaporators
3. How many forces are involved in operating a thermo- C. Three -
The bulb,
static expansion valve? 4. Which of
A. One - only bulb pressure the
B. Two - only the bulb and spring pressure following
C. Three - The bulb, spring, and evaporator best
pressure describes
D.Four - The bulb, spring, evaporator, and the term
atmospher- ic pressure 'flash
gas'?
1/
53
,CIRO OP 2 Questions and Answers Rated 100%
Correct
A. The vapor in the last 25% of travel in a DX spring, and
coil evaporator
B. The gas that is discharged out of the pressure
compressor
C.The gas that is generated at the orifice of the
expan-
C. The gas that is
gener- ated at the
orifice of the
expansion device
2/
53
,CIRO OP 2 Questions and Answers Rated 100%
Correct
sion device
D. The gas that is traveling down the suction
line to- ward the compressor
5. What is the average starting point for setting B. 10F
super- heat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
6. Level adjustment of an "LL" type float switch assembly B. Re-piping or
re-attach-
is accomplished by su-
A. Adjusting the activation screw on the switch
mech- anism
B. Re-piping or re-attaching the float at a
different level
C. Re-calibrating the switch height on the float
assem- bly
D. Entering new level parameters in the
float con- troller
7. When servicing a DX air unit
A. It is acceptable to use the TXV as an
isolation valve as the warm temperature will
result in a complete closing of the valve
B. A separate isolation valve must always be
used to isolate the coil
C. The TXV can be used to isolate the coil if
the su- perheat adjustment is turned
completely in to the "manual off" position
D. The TXV can be used to isolate the coil if the
3/
53
, CIRO OP 2 Questions and Answers Rated 100%
Correct
ing the float at a ditterent level
B. A separate isolation valve must always be used to isolate the coil
4/
53
Correct
1. What was the main disadvantage of hand
C. They did not
expansion valves in early refrigeration
automat- ically adjust
systems
to changing loads so
A. They were big and bulky
an operator had to
B. They always required service because
frequently check and
they had many moving parts
adjust them
C.They did not automatically adjust to changing
loads so an operator had to frequently check
and adjust them
2. What is the advantage of a thermostatic
A. They will
expansion valve
automatical- ly adjust
themselves to
A. They will automatically adjust themselves to match match varying
load condi-
varying load conditions tions
B. They create fully wetted coil surface with coil
capac- ity equal to a gravity flooded system
C. They can be used on gravity, flooded,
recirculated over-feed and DX systems
D. One size fits all evaporators
3. How many forces are involved in operating a thermo- C. Three -
The bulb,
static expansion valve? 4. Which of
A. One - only bulb pressure the
B. Two - only the bulb and spring pressure following
C. Three - The bulb, spring, and evaporator best
pressure describes
D.Four - The bulb, spring, evaporator, and the term
atmospher- ic pressure 'flash
gas'?
1/
53
,CIRO OP 2 Questions and Answers Rated 100%
Correct
A. The vapor in the last 25% of travel in a DX spring, and
coil evaporator
B. The gas that is discharged out of the pressure
compressor
C.The gas that is generated at the orifice of the
expan-
C. The gas that is
gener- ated at the
orifice of the
expansion device
2/
53
,CIRO OP 2 Questions and Answers Rated 100%
Correct
sion device
D. The gas that is traveling down the suction
line to- ward the compressor
5. What is the average starting point for setting B. 10F
super- heat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
6. Level adjustment of an "LL" type float switch assembly B. Re-piping or
re-attach-
is accomplished by su-
A. Adjusting the activation screw on the switch
mech- anism
B. Re-piping or re-attaching the float at a
different level
C. Re-calibrating the switch height on the float
assem- bly
D. Entering new level parameters in the
float con- troller
7. When servicing a DX air unit
A. It is acceptable to use the TXV as an
isolation valve as the warm temperature will
result in a complete closing of the valve
B. A separate isolation valve must always be
used to isolate the coil
C. The TXV can be used to isolate the coil if
the su- perheat adjustment is turned
completely in to the "manual off" position
D. The TXV can be used to isolate the coil if the
3/
53
, CIRO OP 2 Questions and Answers Rated 100%
Correct
ing the float at a ditterent level
B. A separate isolation valve must always be used to isolate the coil
4/
53
