RMO Exam

Because of the latent heat load, refrigeration machine operator was instructed to start the reciprocating plant for air conditioning. Of the following according to recommended practice, the first thing to do is:

The most important reason to use 2 compressors in a cascade system is to :

The advantage of forced draft over natural draft cooling tower is

what is 29.92" HG in Kpa

The rupture disk is always piped into the

A fusible plug melts at

When will the BTUs absorbed by the condensing water be the greatest?

Flooded Evaporators have high heat transfer per square foot, What may be a disadvantage?

Shell and tube condensers have the advantage of

Shell and coil condensers have the advantage of

How many BTUs would be removed in a 30 ton system?

If you have 62 psi at 35 F and 70 psi at 45 deg F, what would 38 deg F be?

Copper is used in refrigeration systems, like in heat ex-changers because?

The accessories on the liquid line are in what order?

A condenser is 20' long and 6' in diameter, what is the volume in gallons if 7.48 gallons is 1 cu/ft?

If the low pressure cutout cycles the compressor off, what starts the compressor again?

Removing insulation on the suction line with the engine room temp at 85F, what will occur?

If you were running three compressors, which best describes the state of refrigerant leaving the third evaporator coil?

An electric motor that is rated at 3 HP will?

In a 3 stage centrifugal chiller, what happens to the pressure as it reaches the final stage?

With an induced draft cooling tower, what is the lowest temperature attainable for a cooling tower?

When a compressor is running fine at full flow and you throttle down flow causing the compressor to stop running normal (short cycle), why would this happen?

When dry bulb is 75F and wet bulb is 75F?

When a compressor is said to have a safety head this means :

The cylinder unloader controls capacity, is there any other function it may have?

An operator suspects that shorted motor windings have caused the motor overloads to trip. In order to investigate this condition, the operator would be most correct to use :

When recovering R22, What color would the cylinder be that you are storing the refrigerant in?

If unloaders were to fail in the unloaded position, what happens in a system using reciprocating compressor?

When the temperature and the load increase and you need to add another pump online, you would :

When a system does not have unloaders, what is needed?

When an evaporator is not equipped with an equalizer line, you would most likely find

When you plan on overhauling a system and you have recovered all liquid refrigerant, what is next?

When there is a 5lb pressure drop across evaporator, you need an external equalizing line, what happens if it disconnects?

The metering device used in a condenser is a high side float, this device will :

If a low side float is being used :

The heat that boils off in a condenser is :

The condenser that uses air and water for cooling is the :

A hermetic compressor is operating with a low refrigerant charge, What is the most likely effect this condition would have on the compressor?

A centrifugal chiller has a suction pressure of 18" Hg vacuum and discharge pressure of 6 psig. What is the compression ratio of this unit ?

If you had to install a solenoid valve to a system which uses 110 volts and needed to convert it to 24 volts, what would you use?

If you had 38 degrees in the evaporator, what should you suction pressure be for R22?

An oil with low viscosity would :

When charging a centrifugal system the position of the valve is :

The suction and discharge valves in a reciprocating compressor are positioned :

What refrigerants are you not able to dump?

There is an automatic water regulating valve on a reciprocating chiller. Water is entering the condenser at 85F and leaving the condenser at 88F. You know there is no scale and the tubes are not covered with film. What can be causing this condition?

How low can chiller water temperature be?

While using a halide torch to check for refrigerant leaks, if the flame was to turn yellow, what happened?

What is the cubic feet of a 20' long 6' vessel on the evaporator?

A water regulating valve is installed in a water cooled condenser. The operating force on this valve is respondent to :

Compound gauges can measure:

A low pressure refrigeration system has a pin hole in the evaporator. What is the most likely result?

What does the centrifugal compressor generate inside?

Oil flashpoint temperature in the compressor should be :

Compressor motors that operate inside the refrigerant atmosphere (atmospheric) :

In a centrifugal three stage compressor:

An operator suspects that a vertical check valve on a discharge of a centrifugal pump is defective, this is a condenser pump and one of three pumps in parallel. If the suspicion is true and the check valve fails to seat when required, the pump and connecting piping will most likely be damaged when :

In relation to the suction pressure of a compressor, The reading in the oil pressure gauge should read :

The following most accurate statement regarding compressor motors that run in a refrigerant atmosphere is that they :

The following is an example of an "inline" refrigerant cleaning system which may be used with a centrifugal compressor containing R123 refrigerant is :

Regarding fire safety ANSI/ASHRAE, which classification indicates the latest flammability and least toxicity?

Bubbles in the sight glass are most likely caused by :

In addition to regulating the refrigerant flow according to the needs of the system, metering devices also serve to :

Regardless of safety classification of the refrigerant in use, in the event of refrigerant escape, the RMO should be aware of :

The refrigeration unit which you have been assigned to is being taken out of service for major repairs. You have been assigned to withdraw refrigerant for storage in suitable containers. According to the NYC fire law handbook you must ensure that containers :

An operator confirms that a chiller water pump in a refrigeration system employing R123 is cavitating, of the following, the most likely cause for this condition is :

An RMO is logging readings from a reciprocating compressor-refrigerating unit. The crankcase and compressor discharge temp have dropped significantly and suction line pressure is high. Of the following the one that may cause this set of conditions is:

The Ratio of actual pressure of water vapor in the atmosphere to the saturation pressure / temp is called :

The dividing line between the high and low sides of the refrigeration system is :

An RMO verifies that a condenser water pump is cavitating in a refrigeration system employing R22 refrigerant. Of the following the most likely cause for this condition is:

An operator notices that a centrifugal pump operates satisfactorily when delivering at full discharge, but loses water flow if throttled. The operator would most accurately assume that this condition is due to:

Assuming that a refrigeration plant uses a horizontal shell and tube condenser with the water in the tubes and the refrigerant in the shell. In controlling the operation of the condenser, the operator should take into account that most likely the heat transfer rate BTU/per sq ft per second in the condenser will :

Electric devices may be used to provide built in defrosting of refrigeration machine evaporator units. These devices are classified as:

Latent heat and refrigeration effect are usually listed as refrigerant properties. The refrigerating effect is also always a lower value than the latent heat because the :

Superheated vapor flowing into a reciprocating compressor protects the compressor parts against liquid intake. Of the following, one of the problems associated with superheat is that:

An operator observes a reading of 60c on a refrigerating unit. The same reading in F scale would be closer to: (x1.8+32)

What is the state of refrigerant as it leaves the compressor and as it leaves the condenser:

Clearance volume:

A Thermal is attached to the suction pipe between the evaporator coil and the compressor covered by an insulating line. Assuming the machine room is 85F unraveling of the insulation would result in:

Of the following one of the primary reasons for the insulation of a crankcase breather line is :

A RMO notices excessive cycling of the temp control for a reciprocating compressor refrigeration unit. The crankcase temp is high, the compressor discharge temp is low and the suction line is high, of the following the one that may be causing this set of conditions is:

A reciprocating system using an evaporative condenser, the muffler is installed between:

While operating an R12 reciprocating system, the RMO noticed the oil foaming the in the crankcase. This condition most likely would have been caused by:

Assume that a new valve plate has been installed while they are repairing a reciprocating compressor in a refrigeration plant. The installation of a new valve plate will require the replacement of:

During a hot weekend, RMO is instructed to start additional reciprocating machine. The sequence of actions on startup would most likely be:

While doing a routine inspection, the RMO noticed the bulb of the TEV on the floor, the operator should attach the bulb at:

When operating a reciprocating refrigeration system with a belt driven compressor, an RMO notices that one of the 4 belts is broken. Of the following, the most advisable course of action for the RMO would be to:

An operator reads the valve tag on a pressure relief valve and notices that the valve is set to unseat at an evaporator pressure of 15 psi, The corresponding set pressure in inches of HG is :

What is the maximum percentage that a refrigerant can be stored in a cylinder?