40C ____ F - CORRECT ANSWER: 104

Second Year IEC Final Latest Update - Actual Exam Questions and 100% Verified Correct Answers Guaranteed A+

______ in utility transmission lines reduces the power losses in the transmission

conductors. - CORRECT ANSWER: increasing the voltage

______ shall not support luminairs weighing over 6 lb. - CORRECT ANSWER:

lampholder

_______ surrounds the windings in typical "pole-mounted" transformers. - CORRECT

ANSWER: oil

40C = ____ F - CORRECT ANSWER: 104

A .25KVA transformer has a nameplate rating of 240/480 primary volts 120/240 secondary volts. IF rated voltage is applied to the primary the secondary voltage will be _____ than the nameplate secondary voltage because these small transformers have compensation built into their secondaries. Higher/lower - CORRECT ANSWER: higher

A 100-gallon water heater is to be installed to supply hot water to the restrooms in an office building. The water heater is rated for 9.8 KW at 240 volts 1- phase. The minimum size THHN/THWN copper wire that can be installed between the required disconnect

switch and the water heater is _____ AWG. - CORRECT ANSWER: 6

A 120/240 volt 1 phase 3 wire panelboard is to be fed from a transformer. The minimum calculated size of the transformer is ______ KVA where the following loads are

connected. :

Circuit 1 : 120-volt lighting that draws 10 amps

Circuit 3 : 17 amps of 120-volt lighting

Circuit 5-7 : 16 AMP 240 volt swimming pool motor - CORRECT ANSWER: 7.92

A 175- amp breaker protects a feeder that originates in a 277/480-volt, 3-ph, 4 wire service panel in an office building. Which of the following conductors is the smallest size

permitted for the feeder ? - CORRECT ANSWER: 2/0

A 20-amp multiwire branch circuit is connected to breakers 1 and 3 in a 120/208 volt 3 phase 4 wire panelboard. _____ if the "hot" from breaker 3 and the neutral are

connected to a 2000-watt lighting fixture load. - CORRECT ANSWER: The load will

operate normally and the breaker will not trip

A 200-amp breaker protects a feeder that originates in a 120/240 volt, 3 ph, 4 wire service panel in a movie theatre. Which of the following THHN/THWN conductors is the smallest size permitted for the feeder ? - CORRECT ANSWER: 3/0 1 / 2

A 240-volt safety switch is fed from a 100 KVA transformer that hs Z= 1.8% on its nameplate. If the tqo 1 phase conductors going to the 240-colt switch are "shorted" together , about ______ amps of current will flow through the transformer winding. The fuses in the safety switch should have an AIC rating of at least this many amps. -

CORRECT ANSWER: 23,148

A certain piece of equipment is to be connected with SOO flexible cord. The equipment requires 2 ungrounded and 1 grounded conductors. Whati si the smallest AWG size cord that can be used to connect the equipment? All conductors should be counted as a current carrying. The maximum load on any one conductors is 31 amps. The equipment

will operate continuously. - CORRECT ANSWER: 6

A fused switch for a motor is located in the top row of switches in a motor control center.This switch is also disconnecting means for the motor. The maximum height of this switch, from finish floor to the center of the operating handle, is _______ . - CORRECT

ANSWER: 6'-7"

A load that uses 6.2 KW of power is using _____ watts.-.62

-. .062

-.620

-.6.2 - CORRECT ANSWER: none of these

A magnetic field is made up of invisible lines of force called ______ - CORRECT

ANSWER: magnetic flux

A PAR lampholder is installed in a 1-gang weatherproof "bell" box. This box is permitted to be supported by RMC and threadless connectors where ______.-i. no more than 18" of RMC is stubbed out of the ground and enters the box -ii. at least two RMCs are stubbed out of the ground into the bottom of the box -

CORRECT ANSWER: neither i or ii

A square D transformer with a nameplate rating of 240/480- V primary and 120/240 volt secondary can be connected to a 2-pole breaker in a _______ panelboard and deliver nameplate-rated voltage to a load.-i. 120/240 volt 3 phase 4 wire

-ii. 277/480 V 3 phase 4 wire - CORRECT ANSWER: i or ii

A switch box will contain the following (one) isolated ground receptacle (one) 12/2 with ground AC cable (BX) with exterior connector The shallowest switch box you can use for this installation is 3"x 2"x _______." -

CORRECT ANSWER: 2 1/2

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