Skills and Trades

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A pulsating sound coming from an oil furnace indicates _____. a. the flame is touching the ... Started by pragya sharda	3 Replies 42 Views	Jul 27, 2018 by ebe
One difference between refrigerant piping practices for air conditioning systems and refrigerant ... Started by joblessjake	1 Replies 42 Views	Jul 27, 2018 by Carliemb17
In an alternating current circuit with an electric motor for a load, the circuit wattage is ... Started by RYAN BANYAN	1 Replies 97 Views	Jul 27, 2018 by TheNamesImani
How does a capacitor work? A) It boosts voltage like a transformer. B) It produces electrons ... Started by Collmarie	1 Replies 39 Views	Jul 27, 2018 by Sassygurl126
After adding refrigerant to a non-pressurized container used with a system dependent recovery ... Started by TFauchery	3 Replies 35 Views	Jul 27, 2018 by sultansheikh
Three phase AC power is used: A) In both residential and commercial buildings. B) Only in Europe. ... Started by sdfghj	1 Replies 37 Views	Jul 27, 2018 by Dominic
The standard transformer VA rating for most HVACR systems is: A) 60 VA. B) 20 VA. C) 100 VA. D) ... Started by Davideckstein7	1 Replies 21 Views	Jul 27, 2018 by aburgess
The voltage between any leg of a 480 Wye transformer and ground is: A) 120 volts. B) 277 volts. ... Started by madam-professor	1 Replies 40 Views	Jul 27, 2018 by Carliemb17
These components must be de-energized with a shorting probe because they can store a residual ... Started by james9437	3 Replies 38 Views	Jul 27, 2018 by sokh
The difference between a relay and a contactor is that: A) Relays can handle more voltage than ... Started by ishan	1 Replies 22 Views	Jul 27, 2018 by shaikhs
If the contacts on a starter become pitted, they should be: A) Sanded and then coated with a fine ... Started by leilurhhh	1 Replies 47 Views	Jul 27, 2018 by kescobar@64
Compared to the main contacts, the auxiliary contacts are: A) Rated for less current than the ... Started by fasfsadfdsfa	1 Replies 74 Views	Jul 27, 2018 by Missbam101
The third color band represents: A) The multiplier for the resistor value. B) The resistor ... Started by cartlidgeashley	3 Replies 54 Views	Jul 27, 2018 by sarah_brady415
To speed up evacuation, you should: A) Use large diameter, long hoses. B) Use small diameter, ... Started by shenderson6	1 Replies 161 Views	Jul 27, 2018 by lucas dlamini
When replacing motor capacitors technicians should be sure the new capacitor is rated within what ... Started by cool	1 Replies 55 Views	Jul 27, 2018 by amandanbreshears
When is line voltage applied to an ECM motor? A) Only when the spinning of the motor cannot ... Started by bclement10	1 Replies 30 Views	Jul 27, 2018 by janeli
Marble is not used as a material in decorative fixtures because it _____. a. stains easily b. ... Started by Medesa	3 Replies 35 Views	Jul 27, 2018 by iman
Motor protection devices are actuated by: A) Temperature, frequency, or phase angle. B) Current, ... Started by rosent76	1 Replies 42 Views	Jul 27, 2018 by thall411
What is the normal allowable source voltage deviation from the motor's nameplate voltage rating? ... Started by misspop	1 Replies 41 Views	Jul 27, 2018 by reversalruiz
When a three phase motor tries to operate on only two legs of power: A) The motor overheats and ... Started by SAVANNAHHOOPER23	1 Replies 33 Views	Jul 27, 2018 by katkat_flores
After de-energizing an ECM motor, why should technicians wait a few minutes before removing the ... Started by kodithompson	3 Replies 70 Views	Jul 27, 2018 by stanleka1
This symbol represents A) Heater. B) Transformer. C) Motor. D) ... Started by humphriesbr@me.com	1 Replies 119 Views	Jul 27, 2018 by gabrielle_lawrence
This symbol represents A) 3 phase motor. B) Compressor with internal overload. C) Single phase ... Started by SAVANNAHHOOPER23	1 Replies 45 Views	Jul 27, 2018 by Yixagurpuldink
Most switches used for safety controls in HVACR circuits: A) Are normally closed and wired in ... Started by sheilaspns	1 Replies 102 Views	Jul 27, 2018 by lauravaras
What component of an outdoor condenser unit is susceptible to damage from torch heat while brazing? ... Started by ec501234	3 Replies 26 Views	Jul 27, 2018 by djofnc