Skills and Trades

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Most switches used for safety controls in HVAC circuits: A) Are normally open and wired in ... Started by Evvie72	3 Replies 102 Views	Jul 24, 2018 by amcvicar
What type of electrical device is a relay? A) A load B) A control C) A combination load and ... Started by CBme	1 Replies 65 Views	Jul 24, 2018 by jliusyl
As a safety precaution, electric duct heaters should be wired so that they will not operate unless: ... Started by savannahhooper	1 Replies 19 Views	Jul 24, 2018 by Sweetkitty24130
What is the difference between a load and a control? A) Controls use power. Loads either let ... Started by storky111	1 Replies 22 Views	Jul 24, 2018 by jonathanballen97
Semiconductors are primarily used in: A) Mechanical control linkages. B) Electromechanical ... Started by pane00	3 Replies 18 Views	Jul 24, 2018 by af
What happens when the outdoor temperature drops? A) The heat pump alone may not be able to ... Started by future617RT	1 Replies 65 Views	Jul 24, 2018 by wshriver
If electric heating elements are used in conjunction with a heat pump, when do they operate? A) ... Started by K@	1 Replies 46 Views	Jul 24, 2018 by memslove
When electric strip heat is used with a heat pump, when is the electric strip heat energized? A) ... Started by Cooldude101	1 Replies 107 Views	Jul 24, 2018 by vish98
The part of an AC induction motor that turns is called: A) The field. B) The flywheel. C) The ... Started by Redwolflake15	3 Replies 23 Views	Jul 24, 2018 by apple
How can a multistage thermostat be applied to control an electric furnace? A) The strips will ... Started by skymedlock	1 Replies 62 Views	Jul 24, 2018 by Briannahope
The part of an AC induction motor that induces the current flow in the rotor is called: A) The ... Started by Marty	1 Replies 43 Views	Jul 24, 2018 by mirabriestensky
The rotor of an ECM motor is composed of: A) Layers of laminated soft iron. B) Permanent ... Started by tfester	1 Replies 52 Views	Jul 24, 2018 by TDubDCFL
The purpose of controls in an HVACR system is to: A) Protect the refrigeration cycle components. ... Started by abarnes	3 Replies 40 Views	Jul 24, 2018 by Christopher
Why should electric furnaces NOT rest directly on the ceiling joists? A) The ceiling will act as ... Started by elizabeth18	1 Replies 46 Views	Jul 24, 2018 by cloud
Compared to the stator's magnetic field, the rotor's magnetic field is: A) Opposite in polarity. ... Started by skymedlock	1 Replies 102 Views	Jul 24, 2018 by matt95
The rotor consists of: A) Aluminum bars mounted on a laminated soft iron core. B) Soft iron bars ... Started by Sufayan.ah	1 Replies 145 Views	Jul 24, 2018 by Carliemb17
Which of the following methods should NOT be used to support an electric furnace? A) Suspending ... Started by dbose	3 Replies 33 Views	Jul 24, 2018 by meganlapinski
The most important part of an electric furnace installation is: A) The size of the fan. B) The ... Started by xroflmao	1 Replies 28 Views	Jul 24, 2018 by Loise Hard
Which of the following items do aluminum conductors require an application of during installation? ... Started by robinn137	1 Replies 21 Views	Jul 24, 2018 by Madisongo23
What are two-position controls? A) Two-position controls will work correctly on either side of ... Started by imanialler	1 Replies 12 Views	Jul 24, 2018 by ms_sulzle
Compared to electro-mechanical controls, pneumatic controls can more easily: A) Provide ... Started by pepyto	3 Replies 82 Views	Jul 24, 2018 by izzat
If aluminum power wire is used, to make a safe connection the installer should make sure: A) To ... Started by mckennatimberlake	1 Replies 134 Views	Jul 24, 2018 by snackralk
What is the minimum current rating for the disconnect switch of a unit with a minimum circuit ... Started by MGLQZ	1 Replies 51 Views	Jul 24, 2018 by Dnite
Types of control systems include: A) Pneumatic, hydraulic, and electro-mechanical. B) Line ... Started by arivle123	1 Replies 94 Views	Jul 24, 2018 by katara
The disconnect switch for the unit: A) Can be the breaker in the power distribution panel feeding ... Started by Deast7027	3 Replies 43 Views	Jul 24, 2018 by jamesnevil303