NYC - Final RMO QUESTIONS AND
ANSWERS
1. A centrifugal compressor is in operation with suction strain in 3psig and the release is
10psig, with an atmospheric stress of 14.7, which is the ratio closest to? -
ANSWER-1.39
2. A centrifugal water pump is considered to be absolutely primed while - ANSWER-The
pump is complete of liquid
3. A centrifugal water pump is known as a boost pump whilst the - ANSWER-water supply
to the pump suction inlet is below the pump level.
4. A low aspect waft valve is used to maintain - ANSWER-The level of the refrigerant
within the evaporator.
5. A multi-cylinder reciprocating compressor makes use of cylinder unloaders to regulate
ability, what would not occur if some of the unloaders fail to function when wished? -
ANSWER-The chill water temperature will growth
6. A reciprocating compressor cylinder has 10 inches bore and 14 inches stroke. The
quantity of refrigerant, in cubic inches, might be in the direction of - ANSWER-1099
7. A reciprocating compressor is making a knocking sound at some stage in operation. If
the refrigerant worn components are not inflicting the knocking, what is probably the
purpose? - ANSWER-The slugging of the liquid refrigerant.
8. A refrigerant engineer verifies that a condenser water pump is cavitating. Of the
subsequent, the most in all likelihood motive for this circumstance is: - ANSWER-A
defective cooling tower water level controller
9. A refrigeration compressor has failed to turn on. The refrigeration engineer on obligation
verifies that the electric circuit to the motor, inclusive of all switches and circuit breakers,
is entire consistent with advocated provider exercise, the subsequent item to be checked
could likely be the - ANSWER-Temperature and pressure controls
10.A refrigeration engineer is logging readings from a reciprocating system. Compressor
discharge temps have dropped notably and the suction line strain is excessive. Which of
the subsequent may be causing this set of situations? - ANSWER-An enlargement
valve is open too extensive.
11.A refrigeration engineer is strolling 2 centrifugal condenser water pumps in parallel. One
of the pumps is at most pump charge. If by means of mistake the refrigeration engineer
throttles back on the release valve of the opposite pump, the maximum in all likelihood
impact could be? - ANSWER-a discount on the whole drift price to the condenser
12.A refrigeration engineer notices excessive cycling of the temperature control for a
reciprocating compressor refrigeration unit. The crankcase temperature is excessive, the
compressor discharge temperature is low, the suction line temperature is excessive, of
the following the only that may purpose this set of situations? - ANSWER-Faulty
compressor valves
, 13.a refrigeration system makes use of jet ejector to raise settle oil combined with
refrigerant to the oil pump. If a restrict in the refrigerant go with the flow to the jet ejector
develops - ANSWER-There may be inadequate head to lift the oil
14.A rooftop water cooling tower is hooked up to a water pump in the constructing
basement with a 12 inches diameter pipe. With the pump turned off, a pressure gauge at
the pumps inlet display a stress of 140psig, the height of the water column, in ft, would
be closest to? - ANSWER-323
15.A solenoid valve is used to allow a reciprocating refrigeration system to adapt to the load
on the machine. The hole of the solenoid valve is resulting from - ANSWER-An electric
modern-day developing a magnetic area.
16.A superheated vappr is a - ANSWER-dry vapor above the saturation temperature
17.A gadget controlled with the aid of a TXV shows excessive discharge stress and
excessive normal sub-cooling. The purpose is maximum likely a? -
ANSWER-Refrigerant overcharge
18.A TXV is used to preserve steady - ANSWER-Evaporator superheat
19.A water chilled machine uses refrigerant R123. A leak within the evaporator shell may
also result in? - ANSWER-A better than normal excessive side strain.
20.A water chiller is prepared with a reciprocating compressor, a thermostatic growth valve
and air cooled condenser. A limit within the refrigerant liquid line would bring about? -
ANSWER-High Suction Superheat
21.According to the attached cloth protection facts sheet (MSDS) R134 is a -
ANSWER-Clear, odorless liquid and vapor
22.All liquid has been recovered from a device to be overhauled, the system -
ANSWER-must now not be opened until all vapor has been recovered.
23.An electronically operated control requires 24V to operate. To trade the to be had 110v to
24v - ANSWER-transformer
24.An equalizer line on a TXV is used to: - ANSWER-atone for the stress drop across
the evaporator coil
25.An oblique low temperature refrigerant device regularly uses glycol, in preference to salt
brine, because the intermediate cooling medium. An benefit of this choice is: -
ANSWER-The elimination of corrosion
26.As proven within the picture under, the suction gauge of a condenser water pump reads
55 PSI. The pipe presenting the pump is seventy five feet long and 12 inches in
diameter. Approximately what number of gallons of water do you count on to reap if this
pipe is drained completely? - ANSWER-440
27.Assume that a refrigeration engineer has a preference of 4 valves to choose from. Which
of the subsequent is the mot effective type of valve to govern strain? - ANSWER-Plug
valve
28.Assume that an engineer is capable of study refrigerant water and oil together. The fluids
from settle within the field from top to bottom: - ANSWER-Oil, water, refrigerant
(YELLOW>WHITE>BLUE)
29.Capacitors are used on refrigeration automobiles. Of the subsequent, the feature of
these gadgets is to? - ANSWER-Store electrical costs all through starting and
jogging the motor.
ANSWERS
1. A centrifugal compressor is in operation with suction strain in 3psig and the release is
10psig, with an atmospheric stress of 14.7, which is the ratio closest to? -
ANSWER-1.39
2. A centrifugal water pump is considered to be absolutely primed while - ANSWER-The
pump is complete of liquid
3. A centrifugal water pump is known as a boost pump whilst the - ANSWER-water supply
to the pump suction inlet is below the pump level.
4. A low aspect waft valve is used to maintain - ANSWER-The level of the refrigerant
within the evaporator.
5. A multi-cylinder reciprocating compressor makes use of cylinder unloaders to regulate
ability, what would not occur if some of the unloaders fail to function when wished? -
ANSWER-The chill water temperature will growth
6. A reciprocating compressor cylinder has 10 inches bore and 14 inches stroke. The
quantity of refrigerant, in cubic inches, might be in the direction of - ANSWER-1099
7. A reciprocating compressor is making a knocking sound at some stage in operation. If
the refrigerant worn components are not inflicting the knocking, what is probably the
purpose? - ANSWER-The slugging of the liquid refrigerant.
8. A refrigerant engineer verifies that a condenser water pump is cavitating. Of the
subsequent, the most in all likelihood motive for this circumstance is: - ANSWER-A
defective cooling tower water level controller
9. A refrigeration compressor has failed to turn on. The refrigeration engineer on obligation
verifies that the electric circuit to the motor, inclusive of all switches and circuit breakers,
is entire consistent with advocated provider exercise, the subsequent item to be checked
could likely be the - ANSWER-Temperature and pressure controls
10.A refrigeration engineer is logging readings from a reciprocating system. Compressor
discharge temps have dropped notably and the suction line strain is excessive. Which of
the subsequent may be causing this set of situations? - ANSWER-An enlargement
valve is open too extensive.
11.A refrigeration engineer is strolling 2 centrifugal condenser water pumps in parallel. One
of the pumps is at most pump charge. If by means of mistake the refrigeration engineer
throttles back on the release valve of the opposite pump, the maximum in all likelihood
impact could be? - ANSWER-a discount on the whole drift price to the condenser
12.A refrigeration engineer notices excessive cycling of the temperature control for a
reciprocating compressor refrigeration unit. The crankcase temperature is excessive, the
compressor discharge temperature is low, the suction line temperature is excessive, of
the following the only that may purpose this set of situations? - ANSWER-Faulty
compressor valves
, 13.a refrigeration system makes use of jet ejector to raise settle oil combined with
refrigerant to the oil pump. If a restrict in the refrigerant go with the flow to the jet ejector
develops - ANSWER-There may be inadequate head to lift the oil
14.A rooftop water cooling tower is hooked up to a water pump in the constructing
basement with a 12 inches diameter pipe. With the pump turned off, a pressure gauge at
the pumps inlet display a stress of 140psig, the height of the water column, in ft, would
be closest to? - ANSWER-323
15.A solenoid valve is used to allow a reciprocating refrigeration system to adapt to the load
on the machine. The hole of the solenoid valve is resulting from - ANSWER-An electric
modern-day developing a magnetic area.
16.A superheated vappr is a - ANSWER-dry vapor above the saturation temperature
17.A gadget controlled with the aid of a TXV shows excessive discharge stress and
excessive normal sub-cooling. The purpose is maximum likely a? -
ANSWER-Refrigerant overcharge
18.A TXV is used to preserve steady - ANSWER-Evaporator superheat
19.A water chilled machine uses refrigerant R123. A leak within the evaporator shell may
also result in? - ANSWER-A better than normal excessive side strain.
20.A water chiller is prepared with a reciprocating compressor, a thermostatic growth valve
and air cooled condenser. A limit within the refrigerant liquid line would bring about? -
ANSWER-High Suction Superheat
21.According to the attached cloth protection facts sheet (MSDS) R134 is a -
ANSWER-Clear, odorless liquid and vapor
22.All liquid has been recovered from a device to be overhauled, the system -
ANSWER-must now not be opened until all vapor has been recovered.
23.An electronically operated control requires 24V to operate. To trade the to be had 110v to
24v - ANSWER-transformer
24.An equalizer line on a TXV is used to: - ANSWER-atone for the stress drop across
the evaporator coil
25.An oblique low temperature refrigerant device regularly uses glycol, in preference to salt
brine, because the intermediate cooling medium. An benefit of this choice is: -
ANSWER-The elimination of corrosion
26.As proven within the picture under, the suction gauge of a condenser water pump reads
55 PSI. The pipe presenting the pump is seventy five feet long and 12 inches in
diameter. Approximately what number of gallons of water do you count on to reap if this
pipe is drained completely? - ANSWER-440
27.Assume that a refrigeration engineer has a preference of 4 valves to choose from. Which
of the subsequent is the mot effective type of valve to govern strain? - ANSWER-Plug
valve
28.Assume that an engineer is capable of study refrigerant water and oil together. The fluids
from settle within the field from top to bottom: - ANSWER-Oil, water, refrigerant
(YELLOW>WHITE>BLUE)
29.Capacitors are used on refrigeration automobiles. Of the subsequent, the feature of
these gadgets is to? - ANSWER-Store electrical costs all through starting and
jogging the motor.
