Archive for July 2018

Which of the following is not a step in the seasonal pre start service?

Which of the following is not a step in the seasonal pre start service?




a) clean all cooling and chilled water strainers
b) add water treatment chemicals
c) turn on energy sources
d) check the purge pump
e) check the magnetic strainers


Answer: C

Concentration of the Lithium Bromide can be most easily controlled by which of the following means?

Concentration of the Lithium Bromide can be most easily controlled by which of the following means?



a) Controlling the volume of water sprayed into the absorber.
b) Controlling the temperature in the cooling tower.
c) Controlling the amount of weak Lithium Bromide pumped into the generator.
d) Controlling the pressure in the vacuum between the evaporator and the absorber.
e) Controlling the temperature in the generator.


Answer: E

This occurs when the temperature of a strong but still unsaturated solution is lowered so far that its salt concentration exceeds the maximum concentration possible at the lower temperature.

This occurs when the temperature of a strong but still unsaturated solution is lowered so far that its salt concentration exceeds the maximum concentration possible at the lower temperature.




a) Ionization
b) Dissociation
c) Crystallization
d) Vapourization
e) Neutralization


Answer: C

Most absorbency systems are put in place where there is cheap excess or waste heat available. What is this heat primarily used for?

Most absorbency systems are put in place where there is cheap excess or waste heat available. What is this heat primarily used for?




a) To pressurize the system
b) To maintain the continuous vacuum
c) To decrease the evaporation point of the refrigerant
d) To run the pumps which force the water through the sprayers
e) To evaporate the water out of the weak Lithium Bromide


Answer: E

What is the function of the concentrator (generator)?

What is the function of the concentrator (generator)?




a) To cool the refrigerant vapour
b) To increase the absorbency potential of used Lithium Bromide
c) To speed up the evaporation of the refrigerant
d) To cool the concentrated absorbent
e) To exchange heat between the high temperature refrigerant vapour and the atmosphere


Answer: B

The absorber is equipped with a pump for which of the following reasons?

The absorber is equipped with a pump for which of the following reasons?




a) To force water into a finely divided state
b) To keep the cycle pressure constant
c) To decrease the refrigerant evaporation point
d) To speed the absorption of water vapour
e) To decrease contact between absorbent and refrigerant


Answer: D

Which of the following statements about Lithium bromide systems is false?

Which of the following statements about Lithium bromide systems is false?



a) Lithium bromide solution has the ability to absorb water vapour readily.
b) The operating cycle in the system is continuous.
c) Evacuating the system lowers the boiling point of water.
d) As water vapour is absorbed by the Lithium Bromide the vacuum decreases.
e) System efficiency is increased by forcing water through a spray header.



Answer: D

In comparing absorption and compression systems which of the following comparisons is true?

In comparing absorption and compression systems which of the following comparisons is true?




a) Pumps in absorption systems require more electrical power.
b) Absorption systems require less space than compression systems.
c) Cooling water requirements are larger for an absorption system than for a compression system.
d) More equipment and piping are required for a compression system.
e) Slugs of liquid carried over from the evaporator do not damage the compression system but can ruin an absorption system.



Answer: C

Ammonia systems are seldom used for air conditioning purposes in large buildings mainly because

Ammonia systems are seldom used for air conditioning purposes in large buildings mainly because




a) ammonia systems require too much maintenance
b) ammonia systems are too expensive
c) ammonia is too toxic
d) ammonia does not provide sufficient cooling power for large operations
e) ammonia systems require a separate power supply not available in most large buildings


Answer: C

A system of regularly scheduled inspections and lubrications along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as

A system of regularly scheduled inspections and lubrications along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as




a) preventative maintenance
b) safety controls
c) routing operation
d) regular maintenance
e) none of the above


Answer: A

A centrifugal compressor refrigerating system can be stopped simply by pressing the stop button unless which of the following circumstances is true?

A centrifugal compressor refrigerating system can be stopped simply by pressing the stop button unless which of the following circumstances is true?



a) The system is automatically controlled.
b) The system's auxiliary equipment is not electrically interlocked.
c) The system's auxiliary equipment can be stopped simultaneously.
d) The compressor can be shut down at the same time as the other equipment.
e) None of the above.


Answer: B

Which of the following steps is NOT part of the startup procedure of centrifugal compressor refrigerating systems.

Which of the following steps is NOT part of the startup procedure of centrifugal compressor refrigerating systems.




a) Check the refrigerant levels.
b) Open the stop valves in the chilled water system.
c) Open the main circuit breakers.
d) Open the makeup water valve.
e) Operate the oil pump for at least 10 minutes before starting the compressor.


Answer: C

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?




a) Pump down the evaporator
b) Fill the compressor with liquid refrigerant
c) Fill the evaporator with refrigerant vapour
d) Open all the suction valves on the connecting condenser line
e) Discharge all the condenser refrigerant into the evaporator


Answer: A

Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?

Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?




a) Check oil level in the compressor, it should be at or above the centre of the sight glass.
b) Check the setting of high and low pressure cutout switches.
c) Open all shutoff valves in the system except bypass valves used elsewhere in the system.
d) Valves in lines connecting suction gages should be closed.
e) If comp is equipped w/an oil sump heater, ensure it is energized & oil temp is hi enough to drive off any refrig


Answer: D

Oil added to refrigeration compressors

Oil added to refrigeration compressors




a) is done when the compressor discharge valve is closed
b) is done with a vacuum on the crankcase
c) is done with the equalizing valve closed
d) is done with the charging line open
e) must be preheated


Answer: B

It is very important to open oil drain valves and plugs in the crankcase for which of the following reasons?

It is very important to open oil drain valves and plugs in the crankcase for which of the following reasons?




a) The oil is very hot.
b) The oil is very cold.
c) Residual pressure in the crankcase may blow refrigerant vapour and oil out.
d) Old oil is contaminated with refrigerant and may be very acidic.
e) Oil can never be drained below the critical minimum level.


Answer: C

Which of the following statements about adding oil to a system is true?

Which of the following statements about adding oil to a system is true?




a) Oil is added by charging it into the crankcase.
b) Because the crankcase is pressurized it is not possible for air to get in the system when adding oil.
c) Oil cannot be added while the compressor is in operation.
d) The system must be recharged, purged and depressurized after the oil has been added.
e) None of the above.



Answer: A

What can cause a high discharge pressure with refrigeration systems?

What can cause a high discharge pressure with refrigeration systems?




a) low evaporator level
b) too much cooling water to the condenser
c) over-purging the unit
d) when unit runs continuously
e) unit over-charged with refrigerant


Answer: E

When initially charging a refrigeration system

When initially charging a refrigeration system




a) it must be done with the liquid line shutoff valve open
b) it is done with a liquid refrigerant
c) it must be done after the unit is shut down
d) it must be done at the compressor suction
e) water should be added to dilute the refrigerant


Answer: B

When charging a refrigeration system it

When charging a refrigeration system it




a) should be done to the condenser
b) should be done with the cooling water shut off
c) should be done to the receiver
d) should be done with the compressor off
e) should be done with the liquid line shutoff valve closed


Answer: E

Charging a refrigeration system

Charging a refrigeration system




a) is done with the expansion valve closed
b) is done by adding refrigerant between the liquid shutoff valve and the expansion valve
c) is done with the compressor shut down
d) is done between the condenser and the receiver
e) is done between the suction valve and the compressor


Answer: B

The liquid line shutoff valve is

The liquid line shutoff valve is




a) used when purging the system
b) a regulating valve
c) used to relieve pressure
d) required to be closed when charging the system
e) on top of the receiver


Answer: D

Frost formation on the suction line indicates what?

Frost formation on the suction line indicates what?




a) Moisture in the system
b) "Copper-Plating" on the bearings and compressor exhaust valve
c) Overcharging the system
d) Thermostat controlled solenoid deterioration
e) Inadequate levels of refrigerant in the system


Answer: C

Before charging a system which of the following needs to be done?

Before charging a system which of the following needs to be done?




a) Interlocks need to be tested
b) Controls need to be set
c) Controls need to be set
d) Required valves need to be opened
e) All of the above


Answer: E

A sulphur candle is a test for

A sulphur candle is a test for




a) freon leaks
b) ammonia leaks
c) air leaks
d) vacuum seal
e) CFC leaks


Answer: B

Which of the following is not a recommended step for the procedure in which dry nitrogen is used for a system leak test?

Which of the following is not a recommended step for the procedure in which dry nitrogen is used for a system leak test?




a) Remove controls and relief valves which may be damaged by the test pressure.
b) Connect the nitrogen cylinder to the system charging valve.
c) Close the liquid line shut-off valve.
d) Open the liquid line shut-off valve.
e) Set the pressure reducing valve for the minimum design pressure of the high side.


Answer: D

Leak testing on a refrigeration system

Leak testing on a refrigeration system




a) is done with a sulphur stick for freon refrigerant
b) is done with litmus paper for freon
c) is done with a sulphur candle for ammonia
d) must be done with the compressor running
e) is done with a vacuum on the system


Answer: C

The chilling coil in an automatic purger has a primary function to

The chilling coil in an automatic purger has a primary function to




a) lower the operating temperature of the purger
b) keep the system cooling while being purged
c) increase the efficiency of the system
d) keep discharge through the coil at the lowest available suction pressure
e) separate refrigerant vapour from the non condensable gases to be purged.


Answer: E

Which of the following statements about Manual Purging Systems is false?

Which of the following statements about Manual Purging Systems is false?




a) They must be operated on a regular schedule.
b) The receiver and condenser should be purged separately.
c) Purging rids the system of noncondensable gases.
d) Refrigerant vapour in the purger is always expelled with the noncondensable gases.
e) Gas being vented into the atmosphere must pass through a water beaker.


Answer: D

The emergency discharge line in a refrigeration system

The emergency discharge line in a refrigeration system




a) is located only on the condenser
b) should have a shut-off valve outside the building
c) is required on all sizes of refrigerating units
d) is located on the evaporator
e) is a vented sewer line


Answer: B

Emergency discharge is used to counter which of the following problems?

Emergency discharge is used to counter which of the following problems?




a) Dangerously low system pressures
b) Toxic refrigerant leaks
c) Combustion of flammable refrigerants
d) Dangerously high system pressures
e) All of the above


Answer: D

Which of the following statements about pressure gages is true?

Which of the following statements about pressure gages is true?




a) They indicate pressures and corresponding temperatures in a system.
b) Dials on refrigeration pressure gages do not indicate saturation temperature.
c) Only one pressure gage is required for each system.
d) The pressure gage will not work if the system is equipped with pulsation dampeners.
e) None of the above.


Answer: A

The function of vibration absorbers is to

The function of vibration absorbers is to




a) lower noise levels
b) reduce pipe hammer
c) increase longevity of the system
d) insulate piping and make the system more efficient
e) allow the load on the system to increase dramatically without straining the components in the system


Answer: A

Which of the following statements about strainers is false?

Which of the following statements about strainers is false?




a) The strainer is installed in the suction line.
b) Piping must be disconnected to clean the strainer.
c) Hermetic type compressors are equipped with a built-in suction strainer.
d) Strainers typically consist of a fine mesh screen basket.
e) Strainers prevent foreign particles from damaging compressor valves.


Answer: B

The control which is replacing suction throttling and operates by swirling the refrigerant in the same direction as the compressor impeller, resulting in a reduction of power required by the compressor is which of the following controls?

The control which is replacing suction throttling and operates by swirling the refrigerant in the same direction as the compressor impeller, resulting in a reduction of power required by the compressor is which of the following controls?





a) Hot gas bypass
b) Cylinder bypass
c) Variable Inlet Guide Vanes
d) Damper control
e) Compressor unloader


Answer: C

The type of operation which stops the compressor when the desired low temperature of the substance to be cooled is reached and starts the compressor up again when the temperature rises to a set level is called

The type of operation which stops the compressor when the desired low temperature of the substance to be cooled is reached and starts the compressor up again when the temperature rises to a set level is called




a) intermittent operation
b) continuous operation with reduced output
c) cylinder bypass operation
d) unloading operation
e) variable guide operation


Answer: A

Which of the following statements about evaporator dampers is true?

Which of the following statements about evaporator dampers is true?




a) These dampers decrease the resistance to the passage of air.
b) When the damper is closed the quantity of air passing over the evaporator coils is at a maximum.
c) Depending on the damper position the quantity of air passing through the duct varies widely.
d) Multispeed blowers cannot be used in combination with evaporator dampers.
e) None of the above.


Answer: E

Sectional evaporators control the capacity of the evaporator by which of the following means?

Sectional evaporators control the capacity of the evaporator by which of the following means?





a) Varying the quantity of air being cooled passing over the evaporator coils.
b) Intermittent operation of the compressor.
c) Divided multipart evaporators which have refrigerant control valves which can be shut off independently as the load decreases.
d) Switching gears in the compressor.
e) Decreasing suction in the compressor.


Answer: C

One method of controlling the capacity of reciprocating compressors is to bypass the discharge from one or more cylinders back to the suction side of the compressor. The control is called

One method of controlling the capacity of reciprocating compressors is to bypass the discharge from one or more cylinders back to the suction side of the compressor. The control is called




a) compressor unloading
b) dampering
c) suction throttling
d) cylinder bypass
e) sectional evaporating


Answer: D

In a system controlled by a high pressure float valve insufficient liquid will cause which of the following results?

In a system controlled by a high pressure float valve insufficient liquid will cause which of the following results?




a) automatic system shut down
b) boosting the compressors pressure
c) liquid being carried over to the compressor with the vapour
d) starving the evaporator and reducing the capacity of the system
e) all of the above


Answer: D

The simple control which restricts the flow of liquid from the condenser to the evaporator and maintains a pressure difference between the two units by using a considerable pressure drop resulting from resistance between the devices length and small bore is called

The simple control which restricts the flow of liquid from the condenser to the evaporator and maintains a pressure difference between the two units by using a considerable pressure drop resulting from resistance between the devices length and small bore is called




a) a high pressure float valve
b) a low pressure float valve
c) a bypass line
d) a capillary tube
e) an external float chamber


Answer: D

Which of the statements about automatic expansion valves is false?

Which of the statements about automatic expansion valves is false?




a) The valve maintains constant pressure in the evaporator during compressor operation regardless of the load.
b) When the compressor stops the valve automatically shuts off.
c) A spring exerting a downward force on the diaphragm tends to open the valve.
d) The spring force is countered by evaporator pressure acting downward against the diaphragm which closes the valve.
e) The control may be used with multiple cooling coils connected to the same compressor.


Answer: E

The most widely used refrigerant control which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an

The most widely used refrigerant control which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an




a) thermostatic expansion valve
b) automatic expansion valve
c) low pressure float valve
d) hand operated expansion valve
e) high pressure float valve


Answer: A

Oil pressure failure switches are used to perform which of the following functions?

Oil pressure failure switches are used to perform which of the following functions?




a) Keep oil from freezing at low pressure.
b) Prevent compressor startup if the oil heater fails.
c) Separate refrigerant dissolved in the oil from the lubricant.
d) Shut down the compressor when the oil pressure drops below the minimum.
e) Keep the oil pressure at a level where the oil will not freeze.


Answer: D

Which of the following statements about flow switches is false?

Which of the following statements about flow switches is false?




a) They are used on chilled water.
b) They are used as lockout switches when flow is insufficient.
c) They are operated by the force exerted on a flexible vane immersed in the liquid flowing in the line.
d) They can only be used to regulate liquid flow (i.e. not air flow).
e) They can be used to close flow indicator circuits.


Answer: D

Safety controls serve what function?

Safety controls serve what function?




a) They stop operation if the temperature gets too high.
b) They stop operation when the pressure gets too high.
c) They stop operation when the pressure is too low.
d) They stop operation when the temperature is too low.
e) All of the above


Answer: E

Which of the following statements about pressure stats is false?

Which of the following statements about pressure stats is false?




a) The control is connected to the suction line of the compressor.
b) The control consists of a switch actuated through a linkage arrangement connected to a bellows or diaphragm.
c) A pressure-stat can be used in conjunction with an automatic expansion valve.
d) When the pressure drops to the minimum allowable the switch acts opposite to a thermostat and opens.
e) A pressure-stat cannot be used with a capillary tube.


Answer: C

The operating control which uses a bimetal element is a

The operating control which uses a bimetal element is a




a) fluid expansion actuating control
b) pressure actuated control
c) humidity actuated control
d) temperature actuated control
e) solenoid actuated control


Answer: D

The purpose of a condenser in a refrigeration system is

The purpose of a condenser in a refrigeration system is




a) to remove the sensible heat from the refrigerant
b) to remove the latent heat from the refrigerant
c) to cool the liquid refrigerant
d) to vaporize the liquid refrigerant
e) to reduce the pressure in the evaporator


Answer: B

The amount of water used in an evaporative condenser is only a small percentage of that used in a water condenser of the same capacity. This is due primarily to what?

The amount of water used in an evaporative condenser is only a small percentage of that used in a water condenser of the same capacity. This is due primarily to what?




a) Evaporating condensers also use air to cool the refrigerant.
b) The evaporating condensers spray refrigerated water onto condensing coil.
c) Water evaporating requires a large amount of latent heat.
d) Water being recirculated.
e) None of the above.


Answer: C

Which of the following statements about double tube condensers is true?

Which of the following statements about double tube condensers is true?




a) It consists of two separate tubes side by side.
b) It cannot be used with air cooled condensers.
c) Water flow in the inner tube is in the opposite direction of the flow of refrigerant.
d) It has the highest efficiency of the water-cooled condensers.
e) It is a small condenser for a large capacity system.


Answer: C

Which of the following statements about the shell and tube evaporator type is false?

Which of the following statements about the shell and tube evaporator type is false?




a) It is also known as a chiller.
b) This type of evaporator cools mainly liquids.
c) The refrigerant is circulating in the shell in the flooded operation.
d) Refrigerant vapour is drawn out of the evaporator by the compressor.
e) The liquid to be cooled circulates through the tubes in the direct-expansion operation.


Answer: E

Refrigerant evaporators

Refrigerant evaporators




a) are only used in ammonia systems
b) are part of the high side of the system
c) are used to transfer oil
d) are only used with very high pressure refrigeration systems
e) are used to transfer heat


Answer: E

A typical stationary crankshaft seal consisting of a metallic bellows soldered at one end to a ring (seal nose) which bears either against a shoulder on the shaft or against a seal ring on the shaft is called a

A typical stationary crankshaft seal consisting of a metallic bellows soldered at one end to a ring (seal nose) which bears either against a shoulder on the shaft or against a seal ring on the shaft is called a




a) packing gland seal
b) diaphragm seal
c) bellows seal
d) rotating mechanical seal
e) setscrew seal


Answer: C

Refrigerant compressors

Refrigerant compressors




a) must have inter-coolers
b) could be a centrifugal type
c) are of the positive displacement type only
d) are used with vapour absorption systems only
e) discharge directly into the evaporator


Answer: B

Piston displacement is defined as

Piston displacement is defined as




a) the distance along which the piston travels
b) the cylinder bore
c) the volume of refrigerant that can be circulated through all the cylinders per unit time
d) piston stroke length
e) the revolutions per minute of the compressor motor


Answer: C

For a Helical Rotor Design rotary compressor which of the following statements is true?

For a Helical Rotor Design rotary compressor which of the following statements is true?




a) The compressor consists of 3 opposing grooved rotors.
b) The driving rotor has less helical lobes than the driven rotor has flute.
c) The vapour is drawn in via the closed space between the driving rotor and the casing.
d) The cylinders around the rotor screws must be considerably larger in diameter than the screws.
e) All of the above


Answer: B

One negative factor of Hermetic type reciprocating compressors is

One negative factor of Hermetic type reciprocating compressors is




a) the compressor and motor are mounted within the same housing
b) the motor is cooled by the low pressure, low temperature vapour being drawn into the housing
c) it does not have or require shaft sealing
d) field servicing is not possible
e) the compressor is driven by an electric motor


Answer: D

In a refrigeration system, the purpose of the compressor is to

In a refrigeration system, the purpose of the compressor is to




a) establish two pressure levels
b) reject the heat from the system
c) absorb the heat into the system
d) regulate the flow of the refrigerant
e) heat the refrigerant


Answer: A

Which of the following is the compressor responsible for doing?

Which of the following is the compressor responsible for doing?



i) Maintains a high pressure in the condenser
ii) Maintains a low pressure in the evaporator
iii) Raises the pressure of the refrigerant


a) i only
b) both i and iii
c) both ii and iii
d) iii only
e) i, ii, and iii


Answer: E

Which of the following is not a function of the compressor in a refrigeration system?

Which of the following is not a function of the compressor in a refrigeration system?




a) draw low pressure refrigerant out of the evaporator
b) draw low temperature refrigerant out of the evaporator
c) lower the temperature of the refrigerant
d) maintain sufficiently low pressure in the evaporator
e) raise the pressure of the refrigerant


Answer: C

Which of the following is a result of an economiser on the refrigeration system?

Which of the following is a result of an economiser on the refrigeration system?




a) an intercooling effect on the compressor
b) reduction of the power required for compression in the second stage compressor
c) reduction of flash vapour in the evaporator
d) increase in the refrigerating capacity of a system
e) all of the above



Answer: E

Which of the following statements about the economizers is false?

Which of the following statements about the economizers is false?




a) It controls the flow of liquid refrigerant from the low pressure evaporator to the high pressure condenser.
b) It is composed of two chambers.
c) The upper float chamber is connected to the bottom of the condenser.
d) The economiser float chamber is connected via the motor to the second stage inlet of the compressor.
e) Liquid refrigerant levels in each chamber are controlled by a float operated valve in the evaporator.



Answer: A

Which of the following is NOT an advantage of a factory assembled packaged refrigerant?

Which of the following is NOT an advantage of a factory assembled packaged refrigerant?




a) Components are designed to match each other.
b) Parts can be ordered and installed separately.
c) The unit is more compact.
d) Space requirements are minimized.
e) The unit is equipped with all the required auxiliary equipment.



Answer: B

Refrigerant evaporators

Refrigerant evaporators




a) always have the refrigerant on the shell side
b) are located between the expansion valve and the receiver
c) may have brine pumped past the coils in an indirect system
d) may be of the walk-in type
e) are usually oil cooled


Answer: C

Which of the following statements about a system that circulates warm brine or water back to a chiller tank is true?

Which of the following statements about a system that circulates warm brine or water back to a chiller tank is true?




a) The system is a direct refrigeration system.
b) The evaporator in the system is located in direct contact with the material being refrigerated.
c) The brine or water is the refrigerant.
d) The evaporator cools the brine or water.
e) All of the above.



Answer: D

For a direct expansion system which of the following statements is true?

For a direct expansion system which of the following statements is true?




a) The evaporator in this system is never in direct contact with the material or space being refrigerated.
b) For large systems calcium chloride brine is cooled by the evaporator then pumped to the area being refrigerated.
c) Water cooled by the chiller evaporation coils is used to refrigerate at temperatures below 0 degrees C.
d) The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated.
e) Water cooled by the chiller evaporation coils is used to refrigerate at temperatures equal to 0 degrees C.



Answer: D

Refrigerant condensers

Refrigerant condensers




a) are always water cooled
b) cool the gas refrigerant discharged from the compressor
c) have a safety valve
d) remove sensible heat only from the refrigerant
e) are not required for freon type refrigerants


Answer: B

A purpose of a liquid refrigerant control or regulating valve is

A purpose of a liquid refrigerant control or regulating valve is




a) to drain the receiver
b) to regulate the refrigerant flow to the evaporator
c) to maintain a constant level in the receiver
d) to regulate the cooling water to condenser
e) to isolate the high side from the low side


Answer: B

The temperature in the evaporator

The temperature in the evaporator




a) depends on pressure in the receiver
b) will decrease when the compressor stops
c) depends on the pressure in the evaporator
d) depends on the ambient temperature
e) is controlled by the charging valve


Answer: C

Freon 22 refrigerant

Freon 22 refrigerant



a) is not miscible with oil
b) is mostly used in packing plants
c) is corrosive on copper
d) is corrosive on aluminum
e) is a heat transferring medium


Answer: E

The latent heat of fusion of ice

The latent heat of fusion of ice



a) is the sensible heat required to melt ice
b) is 335 kJ per 1 kg
c) is 335 kJ per 1 ton
d) is the latent heat required to evaporate ice
e) is 4.2 kJ per gram


Answer: B
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