Skills and Trades

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What must be done to a wafer-lug butterfly valve prior to installation? a. Lubricate the shaft. ... Started by cookcarl	1 Replies 43 Views	Jul 24, 2018 by yifu223
When doing a water system balance, how should the final water flow rate at all units be set? a. ... Started by sarasara	1 Replies 38 Views	Jul 24, 2018 by yuyiding
What is used to improve the efficiency of a screw compressor chiller? a. Use a lithium bromide ... Started by Sufayan.ah	1 Replies 32 Views	Jul 24, 2018 by popopong
The application most likely to use evaporative condensers is a _____. a. refrigerated food ... Started by bobbie	3 Replies 40 Views	Jul 24, 2018 by Andromeda18
One advantage blast freezing offers over some other forms of freezing is _____. a. the ability to ... Started by dmcintosh	1 Replies 57 Views	Jul 24, 2018 by livaneabi
The programmed staging of different sized compressors connected in parallel will result in _____. ... Started by codyclark	1 Replies 29 Views	Jul 24, 2018 by apple
The crankcase pressure regulating valve is _____. a. used in systems with multiple evaporators ... Started by moongchi	1 Replies 38 Views	Jul 24, 2018 by kswal303
In fixtures that maintain temperatures at or above 36F, the coil/saturated suction temperature is ... Started by cartlidgeashley	3 Replies 43 Views	Jul 24, 2018 by Animal_Goddess
Hot-gas defrost sends discharge gas from the compressor directly to the _____. a. evaporator b. ... Started by jjjetplane	1 Replies 43 Views	Jul 24, 2018 by tjayeee
Anhydrous ammonia is also known as refrigerant _____. a. R-771 b. A-717 c. A-771 d. ... Started by jake	1 Replies 37 Views	Jul 24, 2018 by mfedorka
When steel is rolled while it is cold, it _____. a. gets softer b. is annealed c. gains tensile ... Started by elizabeth18	1 Replies 35 Views	Jul 24, 2018 by babybsemail
What type of duct connector contains an additional hem reinforcement? a. Standing S b. ... Started by aabwk4	3 Replies 25 Views	Jul 24, 2018 by mariahkathleeen
What is the maximum distance that a riser should be located away from a wall? a. 2 inches b. 4 ... Started by cool	1 Replies 23 Views	Jul 24, 2018 by Missbam101
The need for breakaway connections on ducts connected to fire damper sleeves is based on the _____. ... Started by jasdeep_brar	1 Replies 34 Views	Jul 24, 2018 by tandmlomax84
Extractors are devices used with _____. a. fire dampers b. smoke dampers c. access doors d. ... Started by cnetterville	1 Replies 55 Views	Jul 24, 2018 by Zebsrer
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in ... Started by asmith134	3 Replies 96 Views	Jul 24, 2018 by coyin
What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? a. 10Hz ... Started by LaDunn	1 Replies 76 Views	Jul 24, 2018 by Kedrick2014
A circuit has a peak voltage of 275V. What is the average voltage value? a. 120V b. 175V c. ... Started by ss2343	1 Replies 70 Views	Jul 24, 2018 by SamMuagrove
The formula for inductive reactance is _____. a. XL = 1 2fL b. XL = 2 fL c. XL = 2 fL d. XL ... Started by karlynnae	1 Replies 29 Views	Jul 24, 2018 by aloop
The current in an inductive circuit _____. a. is faster than the voltage b. is the same as the ... Started by rayancarla1	3 Replies 29 Views	Jul 24, 2018 by Anna
When frequency decreases, capacitive reactance _____. a. increases b. decreases c. stays the ... Started by imanialler	1 Replies 72 Views	Jul 24, 2018 by dominiqueenicolee
In sine wave terminology, the average value is _____. a. 0.637 peak value b. 0.707 peak value ... Started by cdr_15	1 Replies 156 Views	Jul 24, 2018 by sarahccccc
The self-induced voltage across an inductance is equal to the change in _____. a. current with ... Started by j.rubin	1 Replies 135 Views	Jul 24, 2018 by amy.lauersdorf90
Which of the following opposes any change in circuit current? a. Capacitance b. Reactance c. ... Started by ec501234	3 Replies 58 Views	Jul 24, 2018 by carojassy25
According to the power triangle, the apparent power is _____. a. less than the true power b. ... Started by gbarreiro	1 Replies 244 Views	Jul 24, 2018 by jlaineee