1.   	On a NH3 Compression system, Compressor ratio is described as:
a.	The ratio of absolute discharge pressure to absolute suction pressure	c.	the sum of the absolute discharge pressure to absolute suction pressure
b.	the ratio of discharge pressure to suction pressure	d.	the sum of discharge pressure and suction pressure

ANSWER: 	A

 2.   	What is the absorbent in an ammonia absorption system?
a.	brine solution	c.	liquid ammonia
b.	the refrigerant oil	d.	water (R-718)

ANSWER: 	D

 3.   	If a cooling tower circulated 4,300 GPM of water, what is the cooling capacity in tons?
a.	1,433 tons	c.	3,400 tons
b.	650 tons	d.	1,500 tons

ANSWER: 	A

 4.   	What should a cooling tower water ph be maintained at?
a.	8	c.	10
b.	12	d.	14

ANSWER: 	A

 5.   	In an efficiently operating refrigeration system, where would flash gas most likely form?
a.	in the compressor	c.	in the receiver
b.	in the evaporator	d.	in the condenser

ANSWER: 	B

 6.   	What is the capacity of a 10-ton refrigeration unit?
a.	2,000 BTU’s per minute	c.	6,000 BTU’s per minute
b.	4,000 BTU’s per minute	d.	6,000 BTU’s per hour

ANSWER: 	A

 7.   	An evaporator condenser operates most efficiently when:
a.	the wet-bulb temperature of the air is low	c.	on the high side
b.	the web-bulb temperature of the air is high	d.	dry-bulb temperature is high

ANSWER: 	A

 8.   	Reciprocating compressor unloaders usually unload the compressor by:
a.	keeping the discharge valves open	c.	keeping the suction valves open
b.	keeping the discharge valves closed	d.	keeping the suction valves closed

ANSWER: 	C

 9.   	In a refrigeration system, what function does the evaporator perform?
a.	it condenses high-pressure gas to a liquid	c.	it converts low-pressure liquid to a high-pressure gas
b.	it absorbs the heat from the system	d.	it converts a high-pressure gas to a low-pressure liquid

ANSWER: 	B

 10.   	What would be the advantage of a cascade system?
a.	lower cost lower maintenance	c.	it is ozone friendly
b.	higher output	d.	it is capable of reaching very low temp.’s

ANSWER: 	D

 11.   	If a compound gauge reads 15 in. Hg,  what is its equivalent in psig?
a.	–7.5 psig	c.	7.5 psig
b.	–15 psig	d.	30 psig

ANSWER: 	C (X .491)

 12.   	What would the rpm’s be of a four pole motor rated at 150 hp, 120 volts, and 60 cycles?
a.	1,800 rpm	c.	1,250 rpm
b.	2,250	d.	1,500 rpm

ANSWER: 	A

 13.   	When is the best time to purge an ammonia plant with a 250-pound drum?
a.	before start-up	c.	during operation
b.	after shutdown	d.	anytime you want

ANSWER: 	C

 14.   	Where in an NH3 absorption system would you find the strong liquor?
a.	in the absorber	c.	the receiver
b.	in the generator	d.	in the heat exchanger

ANSWER: 	B

 15.   	A NH3 compressor low-side compound gauge is usually calibrated to read from:
a.	60” vacuum to 300-psig	c.	60” vacuum to 250 psig
b.	30” vacuum to 300-psig	d.	30” vacuum to 250 psi

ANSWER: 	D

 16.   	How many BTU in a ton of refrigeration for 1 hour?
a.	12,000 BTU/hr	c.	15,000 BTU/hr
b.	13,000 BTU’s/hr	d.	18,000 BTU’s/h

ANSWER: 	A

 17.   	What best describes the operation of valves on a single acting reciprocating NH3 compressor?
a.	they are opened and closed by spring differences	c.	they move by cam rotation
b.	they are opened and closed by pressure differences	d.	movement is by external springs

ANSWER: 	B

 18.   	Which of the following would not be a cause of high head pressure?
a.	under charge of refrigerant	c.	clogged condenser tubes
b.	fouled condenser	d.	non-condensable gases in the system

ANSWER: 	A

 19.   	The counter-flow principle is an important feature of:
a.	natural draft condenser	c.	evaporative condenser
b.	atmospheric condenser	d.	double pipe water cooled condenser

ANSWER: 	D

 20.   	The relation between a refrigeration compressor’s theoretical and actual performance is defined as its:
a.	power factor	c.	compressor efficiency
b.	mechanical efficiency	d.	thermal efficiency

ANSWER: 	B

 21.   	Which of the following formulas best demonstrates Boyle’s Law of gasses?
a.	T1 x V2 –T2 x V1	c.	P1 x T1 =P2 x T2
b.	T1 x V1 = T2 x V2	d.	P1 x V1 = P2 x V2

ANSWER: 	D

 22.   	In an NH3 absorption system, the flow of ammonia goes from:
a.	the evaporator to absorber	c.	the condenser to absorber
b.	the absorber to analyzer	d.	the condenser to analyzer

ANSWER: 	A

 23.   	Which of the following is a false statement about the operation of a shell & tube condenser?
a.	discharge water may be used as a compressor coolant	c.	may be both a condenser and receiver
b.	if the  water supply is scarce, a cooling tower may be used	d.	water normally circulated through the shell

ANSWER: 	D

 24.   	What schedule of piping is required for the liquid refrigerant lines in an NH3 system?
a.	schedule 60	c.	schedule 20
b.	schedule 80	d.	schedule 40

ANSWER: 	B

 25.   	What formula is used to determine tower water cycles?
a.	tower water chlorides ÷ make up water chlorides	c.	make up x hardness
b.	ph x conductivity	d.	specific gravity x 8.33

ANSWER: 	A

 26.   	A cooling tower circulating 35,819 lb/water per minute, what is the cooling capacity in tons?
a.	298,372	c.	1,433
b.	99,457	d.	4,300

ANSWER: 	C   (35,819/8.33)/3

 27.   	The booster compressor of a two-stage refrigeration system is located between the:
a.	evaporator and the intercooler	c.	the condenser and evaporator
b.	the intercooler and the compressor	d.	the intercooler and condenser

ANSWER: 	A

 28.   	What effect be a system using a high-side float, if the float became filled with liquid?
a.	the condenser would flood with refrigerant	c.	the evaporator will flood with refrigerant
b.	the evaporator will starve for refrigerant	d.	the compressor safety will lift

ANSWER: 	B

 29.   	When a reciprocating compressor’s discharge line is cool, it could indicate:
a.	the piston valve is broken	c.	the evaporator coils have frozen
b.	the cooling water jacket has ruptured	d.	that you need more ammonia

ANSWER: 	C

 30.   	What type of pump is most often used to circulate brine to the system?
a.	rotary	c.	centrifugal
b.	gear	d.	none of the above

ANSWER: 	C

 31.   	If the suction valve is closed and discharged valve open on a reciprocating compressor, what will happen?
a.	head pressure would rise	c.	safety valve would pop
b.	head pressure would decrease      	d.	non-condensable gasses will be drawn in

ANSWER: 	D

 32.   	In a refrigeration system, what determines the low-side pressure?
a.	the amount of load on the system	c.	the amount of liquid in the receiver
b.	the compressor speed	d.	the evaporator flow rate

ANSWER: 	A

 33.   	In a refrigeration system, where would you find the king valve of the liquid receiver?
a.	between the condenser and receiver	c.	between the accumulator and the compressor
b.	between the receiver and the expansion valve	d.	placed before the high pressure compressor

ANSWER: 	B

 34.   	What would frost indicate on the suction line of a system with a high side float-metering device?
a.	oil is carrying over from the compressor      	c.	non-condensable have been drawn in
b.	system is under-charged with refrigerant	d.	system is over-charged with refrigerant

ANSWER: 	D

 35.   	The capacity of an evaporative condenser depends upon the:
a.	fan horsepower	c.	receiver
b.	entering air wet bulb temp	d.	rectifier

ANSWER: 	B

 36.   	The force exerted on a 4-inch piston with a cylinder pressure of 100 psi is:
a.	1,200 lbs	c.	34.5 lbs.
b.	1,256 lbs	d.	1,500 psi

ANSWER: 	B       D x D x .7854 x psi

 37.   	Which of the following would cause foaming of the compressor crank case oil?
a.	a leak in the compressor casing	c.	an increase in discharge pressure
b.	an over charge of refrigerant      	d.	a temperature change in the system

ANSWER: 	D

 38.   	Which temperature is the lowest recommended for use with calcium chloride brine?
a.	–61.2°F	c.	-32°F
b.	–41.8°F	d.	0°F

ANSWER: 	B

 39.   	The generator receives what medium in a absorption system?
a.	weak liquor	c.	water (R-718)
b.	strong liquor	d.	steam

ANSWER: 	B

 40.   	Refrigerant recycling is defined as:
a.	reprocessing refrigerant into a new product	c.	cleaning refrigerant of dirt and contaminates and non-condensable
b.	chemically analyzing the refrigerant	d.	all of the above

ANSWER: 	C

 41.   	Which compressor utilizes a slide valve for load control?
a.	Rotary	c.	Screw
b.	Reciprocating	d.	Centrifugal

ANSWER: 	C

 42.   	Which water chemistry test is used to determine cooling tower cycles of concentration?
a.	Chlorides	c.	Ph
b.	Conductivity	d.	hardness

ANSWER: 	A

 43.   	What circuit is energized after the compressor motor reaches operating speed?
a.	the rheostat	c.	the starter field
b.	the transformer	d.	the running windings

ANSWER: 	D
	Compressor Bank 12
POINTS: 	0 / 1

 44.   	The condenser and receivers of industrial systems should be filled to a maximum of:
a.	90% of total volume      	c.	85% of total volume
b.	80% of total volume      	d.	75 % of total volume

ANSWER: 	A
	Refrigeration Fundamentals 20
only industrial receiver are filled to 90% they must be fastened to the floor or welded to the ceiling.
POINTS: 	1 / 1

 45.   	As suction pressure in a reciprocating comp. increases, and the HP decreases, compressor capacity:
a.	increases	c.	stays the same
b.	decreases	d.	fluctuates

ANSWER: 	A

 46.   	In refrigeration, what effect would an increase in load on the evaporator have on the system?
a.	a suction pressure increases & hp decrease	c.	stay the same
b.	a suction pressure increase & hp increase	d.	none of the above

ANSWER: 	A

 47.   	If a cooling tower water sample has a PH of 7.8 it is:
a.	highly alkaline      	c.	highly acidic
b.	slightly acidic	d.	slightly alkaline

ANSWER: 	D

 48.   	In the absence of automatic unloaders, the motor starting load can be minimized by use of:
a.	a backpressure valve	c.	a check valve
b.	to lubricate moving parts	d.	an automatic regulating valve

ANSWER: 	A

 49.   	What increase above normal condenser temperature could indicate scale formation?
a.	8°F	c.	10°F
b.	3°F	d.	5°F

ANSWER: 	B

 50.   	when discussing a reciprocating compressor what does the term swept volume refer to?
a.	The swept volume is the actual displacement of the piston, forgetting such losses as bumping clearances, valve clearances, ring losses and the like.	c.	this implies its a double acting compressor.
b.	this is the clearance pocket size	d.	this refers to the motion the crank shaft and connecting rods make on reach revolution.

ANSWER: 	A