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If the power is shut off to a solenoid valve and it opens, what type of solenoid valve is it? Select one: a. a normally open solenoid valve b. anormally closed solenoid valve c. a thermal acting solenoid valve d.a direct acting solenoid valve ANSWER VV a normally open solenoid valve Which of the following best describes the operaiton of a single acting compressor? Select one: anone of the answers b. the refrigerant gas is compressed on only one side of the piston c. the piston speed can manually be controlled for better volumetric efficiency d. the refrigerant gas is compressed on one side of the piston and then the other ANSWER ¥ ¥ the refrigerant gas is compressed on only one side of the piston A refrigeration unit with a capacity of 788.000 Btu/br. produces how man tons of refrigeration? Select one: a 50 tons b 75 tons c. 65 tons 4. 90 tons ANSWER V ¥ 65 tons The oil sump temperature for a centrifugal chiller should be? Sclect one: a. 126-130 b. 110-125 c. 140-160 d. 131-139 ANSWER Vv 140-160 Oils used in refrigeration are: Select one: a. benzenes, glycols, esters b. glycols, synthetics, ester c. mineral, conventional, benzenes d. ester, synthetics, conventional ANSWER V V benzenes, glycols, esters Chlorofluorocarbon (CFC) refrigerants are so named because they contain the elements: Select one: a. chlorine, hydrogen & carbon b. fluorine, hydrogen & carbon c. chlorine, fluorine & hydroge d. chlorine, fluorine & carbon ANSWER V ¥ chlorine, fluorine & carbon d. cap tube. ANSWER VV compressor. In refrigeration practice, the term "refrigerant reclaiming" can best be described as: Sclect one: a. the selling of reprocessed refrigerant as a reclaimed refrigerant b. all of the answers c. the chemical analvsis and distillation of a refrigerant d. the reprocessing of a refrigerant into a new product ANSWER V V¥ all of the answers How many different refrigerants may be recovered into the same cylinder? Select one: a. depends on the reclaim company. b. only one. c. only two. d. any number as long as all are CFCs. ANSWER V ¥ only one. What is the color of the cylinder of R- 407C? Select one: a. green b. dark blue c. white d. chocolate ANSWER V Vv chocolate When scrapping a disposable cylinder, the internalcylinder pressure should be reduced to at least: Select one: a. 20 psig b. 50 psig C. 80 psig 4.0 psig ANSWER VV 0 psig When operating refrigerant recovery or recycling equipment, the following precautions should be followed. Select one: a. wear safety glasses b. wear protective gloves c. all of the answers d. follow all safety precautions for the equipment ANSWER V ¥ all of the answers Which of the following is/are violation(s) of the Clean Air Act? Select one: a. falsifying or failing to keep required records b. knowingly releasing CFC or HCFC refrigerants or their substitutes while repairing appliances c. all of the answers d. failing to reach required evacuation levels before opening or disposing of appliances ANSWER V ¥ all of the answers a. it absorbs heat from the svstem b. none of the answers ¢. il converts high pressure gas to a low pressure liquid refrigerant d. it converts low pressure liquid refrigerant into a high oressure aas ANSWER V ¥ it absorbs heat from the system The lowest temperature at which oil can flow is called: Select one: a. pour point b. lubricity ¢. viscosity index d. viscosity ANSWER VV pour point What is the term for the heat that increases the temperature of a refrigerant without causing a change of state’? Select one: a. latent heat b. evaporative heat c. specific heat d. sensible heat ANSWER VV sensible heat Ozone in the stratosphere above the earth consists of Select one: a molecules containing 3 oxygen atoms. b. molecules of 2 oxvgen atoms. c. pollutants that have risen from ground level. d, radioactive particles. ANSWER VV molecules containing 3 oxygen atoms. The term used to describe the fact that a refrigerant blend has a range of boiling or condensing points at a constant pressure is: Select one: a. pressure slump. b. fractionation. c. temperature glide d. mixture glide. ANSWER V v temperature glide. An cxample of an HCFC refrigerant is: Select one: a. R-11 b. R-717 C.R-114 d. R-22 ANSWER VV R-22 Ozone depletion potential, or "ODP," is: Select one: a. The same as global warming potential, or "GWP." b. A measurement of CFCs' and IICFCs' ability to destroy ozone. c. A rating of smog pollution concentrations. The speed at which air moves is: Sclect one a. cfm b. static pressure c. air velocity d. air flow ANSWER V ¥ air velocity The quantity of energy absorbed by a unil mass of refrigerant in the evaporator is called: Select one: a. mass flow rate b. refrigeration effect c. volumetric flow rate d. capacity ANSWER V ¥ refrigeration effect When was the clean air act amendments first regulation put into place? Select one: a. 1989 b. 1970 C. 1995 d. 1963 ANSWER VV 1963 The state of the refrigerant leaving the condenser of a refrigeration system is: Select one: a. high pressure liquid. b. low pressure liquid. c. high pressure vapor. d. low pressure vapor. ANSWER Vv ¥ high pressure liquid. Calculate the total force exerted on a piston 5 inches in diameter, has a 12 inch stroke and the pressure on the cylinder is 125 psi. Select one: a. 2,543 pounds b. 2,353 pounds c. 2,345 pounds d. 2.453 pounds ANSWER V V 2,453 pounds When recovering refrigerant, it is important not to mix different refrigerants in the same container because: Select one: a. the mixture would explode. b. the refrigerant mixture ts toxic. c. the mixture may be impossible to reclaim. d. itis a violation of EPA environmental regulations. ANSWER V V the mixture may be impossible to reclaim What is a ternary blend refrigerant? Select one: C. 1-2 d. 5-6 ANSWER VV 3-4 The Montreal Protocol is: Select one: a. a test for ozone concentration. b. a treaty among nations that controls production of chlorofluorocarbons and hydrochlorofluorocarbons. c. a test for energy efficiency adopted by the Canadian government. d. a procedure for measuring levels of CFCs in the atmosphere. ANSWER Vv a treaty among nations that controls production of chlorofluorocarbons and hydrochlorofluorocarbons Long hoses between the unit and the recovery machine should be avoided as they cause: Select one: a. all of the answers b. increased recovery lime. ¢. excessive pressure drop. d. increased emissions. ANSWER VV all of the answers A refrigerant cylinder that has a gray body and a yellow top indicates the cylinder is designed to hold. Select one: a. only refrigerant HCFC 123 b. acetylene c. inert gas d. recovered refrigerant ANSWER V V recovered refrigerant The oils that will be employed with most of the HFC-134a refrigeration applications are: Select one: a. alkylbenzenes. b. esters. ce. whale oils. d. all oils are compatible with HFC-134a ANSWER V ¥ esters Which of the following is included in the list of good service practices for conserving refrigerant? Select one: a. keep systems tight b. find and repair leaks c. recover or recycle refrigerant d. all of the answers ANSWER V ¥ all of the answers The state of the refrigerant entering the compressor of a refrigeration system is: Select one: a. high pressure vapor. b. low pressure liquid. c. high pressure liquid d. low pressure vapor. ANSWER ¥ ¥ low pressure vapor. In a centrifugal compressor chiller the oil cooler sump temperature should be maintained at what temperature? Select one: a. 115 Fahrenheit to 135 Fahrenheit b. LO0°F to one 25°F c. 140 Fahrenheit to 160 Fahrenheit d. does not matter ANSWER VV 140 Fahrenheit to 160 Fahrenheit Removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way defines Sclect one: a. reclaiming b. restoring ¢. recovering d. recycling ANSWER VV recovering Hydrochlorofluorocarbons (HCFC) refrigerants contain: Select one: a. hydrogen, chlorine, fluorine & carbon. b. water, chlorine, fluorine & carbon. c. water, hydrogen, chlorine & carbon. d. hydrogen, chlorine, fluorine & water. ANSWER V V hydrogen, chlorine, fluorine & carbon. The component of a refrigeration system which changes a high pressure vapor to a high pressure liquid is the: Select one: a. receiver. b. metering device. ¢, accumulator. d. condenser. ANSWER V ¥ condenser. The evaporator approach temperature of a chiller with three passes is approximately degrees? Select one: as d.8 ANSWER VV 5 Which atom of the CFC molecule causes ozone depletion? Select one: acarbon b. chlorine ¢. fluorine d. hydrogen ANSWER VV chlorine 
