Esco Core / Type 1/ Type 2 / Type 3 Questions And Answers., Exams of Electrical and Electronics Engineering

Download Esco Core / Type 1/ Type 2 / Type 3 Questions And Answers. and more Exams Electrical and Electronics Engineering in PDF only on Docsity! Esco Core / Type 1/ Type 2 / Type 3 Questions And Answers. The layer of the Stratosphere that protects us from excessive Ultra Violet radiation is comprised of; - Correct answer ozone The molecule found in CFC's and HCFC's that depletes ozone is: - Correct answer chlorine Crop loss, eye disease, and skin cancer have been attributed to; - Correct answer depletion of stratospheric ozone How many chlorine atoms does it take to destroy 1,000,000 (one million) ozone molecules? - Correct answer 10 The chlorine in CFC's will; - Correct answer not dissolve in water HCFC's contain - Correct answer hydrogen, chlorine, fluorine, carbon Which of the following has the highest Ozone Depletion Potential? - Correct answer cfcs Technicians have been required to be certified to service, maintain, or dispose of appliances containing regulated refrigerants since. - Correct answer november 14 , 1994 It has been a violation of EPA Section 608 regulations to vent CFC's or HCFC's since; - Correct answer july 1, 1992 It has been a violation of EPA Section 608 regulations to vent HFC's since - Correct answer november 15, 1995 Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal is the proper disposal method for; - Correct answer disposable cylinders Which international agreement (Treaty) regulated the production and use of CFCs, HCFC's, halons, methyl chloroform and carbon tetrachloride? - Correct answer montreal protocal Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers, is the definition of; - Correct answer recycle To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines; - Correct answer reclaiming HFC's ________; - Correct answer will not damage stratospheric ozone When chlorine monoxide is found in the stratosphere, it indicates that; - Correct answer the ozone layer is being depleted Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) - Correct answer are odp substances The two types of recovery systems are - Correct answer system dependent and self contained When a system is in full vacuum ____________ - Correct answer never energize the compressor The evaporator ___________________ - Correct answer changes a low pressure liquid to a low pressure vapor The condenser _______________________________________ - Correct answer changes a high pressure vapor to a high pressure liquid The metering device ______________________________ - Correct answer changes a high pressure liquid to a low liquid The compressor ____________________________________ - Correct answer changes a low pressure vapor to a high pressure vapor An ozone molecule contains; - Correct answer 3 oxygen atoms Which type of refrigerant contains no chlorine? - Correct answer HFCs Recovery equipment manufactured before November 15, 1993 must be capable of recovering. - Correct answer 80 percent of the refrigerant or achieving 4 inches of vacuum When pressurizing a system with nitrogen you should; - Correct answer charge through a pressure regulator, place a relief valve in the downstream line from the pressure regulator After recovering refrigerant, the Nitrogen used to flush the system may be: - Correct answer legally vented Industrial process and refrigeration units with a 50 pound charge or more with an annualized leak rate of _____ or more must have leaks repaired. - Correct answer 35 % Unless plans are made to replace a system exceeding the maximum leak, repairs must be made in; - Correct answer 30 days Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as; - Correct answer type A-1 All Refrigeration & HVAC systems are protected by a; - Correct answer pressure relief valve A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms fall under; - Correct answer ASHRAE Standard 15 Non-condensables will cause; - Correct answer high discharge pressure A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of: - Correct answer low ambient temperature EPA regulations state that maintenance, service or repair involving the removal of the following component is a "major repair" - Correct answer compressor What refrigerant can be used as a trace gas when checking for leaks? - Correct answer R-22 What can be done with the refrigerant trace gas and nitrogen after the leak is found? - Correct answer release into the atmosphere High pressure appliances can be evacuated to atmospheric pressure (O psig) when; - Correct answer there is a leak If a high pressure appliance containing 100 lbs. of an HCFC OTHER THAN R-22 refrigerant Recovery and/or Recycling equipment manufactured after November 15, 1993 must be evacuated to a level of; - Correct answer 10 inches of vacuum When dehydrating a system it should be evacuated to a level of; - Correct answer 500 microns When recovering from a system with a refrigerant leak, recover to a level of; - Correct answer 0 psig When using a recovery system manufactured after November 15, 1993 on a system containing 100 lbs. of R-502 must be evacuated to; - Correct answer 10 inches of mercury If a high pressure appliance containing 210 lbs. of R-22 refrigerant Recovery and/or Recycling equipment manufactured before November 15, 1993 must be evacuated to a level of; - Correct answer 4 inches of vacuum What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level? - Correct answer a system with a large leak and system pressure of atmospheric A new split system should be checked for leaks by; - Correct answer pressurizing the system with a few ounces of R-22 and an inert gas An overcharged system will operate; - Correct answer less efficiently Refrigerant should be removed from the condenser outlet if the condenser is; - Correct answer below the reciever EPA regulations require that all Commercial and Industrial Process Refrigeration containing more than 50lbs. of refrigerant MUST be repaired when the annual leak rate exceeds; - Correct answer 35 % Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by; - Correct answer EPA approved laboratory What happens to a refrigerant that is above the saturation temperature? - Correct answer it remains in a vapor state Which of the following refrigerant is considered high or very high pressure refrigerant? - Correct answer HFC- 134 a Air conditioning system short cycling is normally caused by; - Correct answer the system being oversized for the home What type of equipment can be worked on with Type III certification? - Correct answer low pressure The most efficient method of leak checking a charged low-pressure refrigeration unit is to - Correct answer pressurize the system by the use of controlled hot water or heater blankets When pressurizing a system, do not exceed - Correct answer 10 psig After reaching the required vacuum on an appliance when servicing, moisture is indicated by; - Correct answer multiple rises in pressure over a period of time with increase of pauses between rises EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 1993 is - Correct answer 25 inches of HG EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is - Correct answer 25 mm HG absolute What can be used to pressurize a chiller system before opening the system for a non-major repair? - Correct answer controlled hot water