Skills and Trades

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A micron is a unit of length equal to: A) 1/1,000 of a meter. B) 1/1,000 of a millimeter. C) ... Started by elizabeth18	1 Replies 38 Views	Jul 24, 2018 by connor417
When using a three-port manifold, the vacuum pump should be connected to: A) The suction line ... Started by karlynnae	1 Replies 50 Views	Jul 24, 2018 by amanda_14
What effect do noncondensable gases have on a refrigeration system? A) They increase evaporator ... Started by serike	3 Replies 41 Views	Jul 24, 2018 by ApricotDream
All AC equipment is designed to operate at voltages within what percent of its rated power? A) 15 ... Started by javeds	1 Replies 124 Views	Jul 24, 2018 by SAUXC
The vacuum level on a system being evacuated pulls down to 2,000 microns, but goes no lower even as ... Started by WWatsford	1 Replies 84 Views	Jul 24, 2018 by morganmarie791
A transformer uses this electrical principle to increase or reduce voltage with no moving parts or ... Started by dmcintosh	1 Replies 47 Views	Jul 24, 2018 by shayla
What is the frequency of alternating current? A) The amount of current flowing B) The number of ... Started by saraeharris	3 Replies 58 Views	Jul 24, 2018 by lgoldst9
A split system's data plate is useful because: A) The factory charge is shown on the data plate. ... Started by karen	1 Replies 20 Views	Jul 24, 2018 by missalyssa26
The compressor in an existing split system is being replaced. The system has a 35 ft line set. The ... Started by dalyningkenk	1 Replies 27 Views	Jul 24, 2018 by scottmt
When calculating the effect of temperature change on a standing charge: A) Always use absolute ... Started by xclash	1 Replies 10 Views	Jul 24, 2018 by jesse.fleming
Using Ohm's law, what is the amp draw of a circuit with a voltage of 240 V and a resistance of 10 ? ... Started by brutforce	3 Replies 18 Views	Jul 24, 2018 by Andromeda18
What is the voltage drop across a 30- resistor with a current draw of 5 A? A) 5 A/30 = 0.17 V B) ... Started by appyboo	1 Replies 31 Views	Jul 24, 2018 by juliaf
What is the total circuit resistance of three heat strips wired in series if each strip has a ... Started by Shelles	1 Replies 387 Views	Jul 24, 2018 by livaneabi
What effect does moisture have on a refrigeration system? A) Corrosion of metals and freeze-up at ... Started by brutforce	1 Replies 48 Views	Jul 24, 2018 by SamMuagrove
The maximum safe pressure to impose on any low-pressure system is: A) 15 psig. B) 10 psig. C) 5 ... Started by Ebrown	3 Replies 65 Views	Jul 24, 2018 by amy.lauersdorf90
What is the current draw of a 1,200-W electric heater operating on a 120-V AC power supply? A) ... Started by deesands	1 Replies 89 Views	Jul 24, 2018 by billybob123
Which of the following accurately describes the danger of air in the refrigeration system? A) The ... Started by jayhills49	1 Replies 25 Views	Jul 24, 2018 by triiciiaa
The purpose of evacuating a refrigeration system is to: A) Remove noncondensable gases. B) Remove ... Started by leo leo	1 Replies 34 Views	Jul 24, 2018 by phuda
What is the annual leak rate of a system that holds 100 lb of refrigerant and loses three lb of ... Started by AEWBW	3 Replies 111 Views	Jul 24, 2018 by scrocafella
Why is a pressure regulator necessary when using nitrogen cylinders? A) The nitrogen must be ... Started by ARLKQ	1 Replies 25 Views	Jul 24, 2018 by kbennett34
A thermostatic expansion valve system operating with a refrigerant overcharge will have: A) ... Started by sheilaspns	1 Replies 48 Views	Jul 24, 2018 by xMRAZ
Using the liquid-line ambient temperature approach method to check the charge, if the liquid line is ... Started by LaDunn	1 Replies 69 Views	Jul 24, 2018 by brittanywood
Which of the following is a device that does not switch motor contactors and starters on and off but ... Started by james0929	3 Replies 38 Views	Jul 24, 2018 by maya.nigrin17@yahoo.com
What is an electrical load? A) An electrical device that requires power to operate B) A problem ... Started by sheilaspns	1 Replies 76 Views	Jul 24, 2018 by fwbard
Why are heated diode leak detectors better than corona discharge leak detectors? A) Heated diode ... Started by naturalchemist	1 Replies 74 Views	Jul 24, 2018 by Li Jun