Test

Free Basic Electrical Engineering Practice Test (Continued)

This is the continuation of the Free Basic Electrical Engineering Practice Test. Take this test to see how well you understand your Basic Electrical Engineering. In case you miss any questions, adequate explanations have been provided. We highly recommend you to take this test.

  1. 10 questions in all. There is no time constraint, so take your time. You need to score at least 80% to pass
  2. You can retake the test at any time. We recommend you share with friends too.
Improve Your Skills As An Engineer

#1. In compliance with the Code, liquidtight flexible metal conduit (LFMC) enclosing power and lighting circuit conductors is not considered an effective ground-fault current path where the length of the LFMC exceeds _____.


Deal Score0



Part VI of Article 250 covers the wiring methods and installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors and liquid-tight flexible metal conduit (LFMC) is included in the list. However, 250.122(6)d. tells the reader where the flex is longer than 6 feet it is not considered an effective type of equipment grounding conductor and a wire-type equipment grounding conductor needs to be installed.

#2. For a 3-phase, continuous duty, induction-type motor, Table 430.250 is not used to determine the _____ for the motor.


Deal Score0



Article 430 covers motors, motor conductors, motor protection, motor controllers, motor control circuits, and motor control centers. Section 430.6(A)(1) explains for a motor of this type, Table 430.250 that shows the full-load current (FLC) of motors, shall be used to determine the ampacity of conductors or ampere ratings of switches, branch-circuit short-circuit and ground-fault protection, instead of the actual ampere rating marked on the motor nameplate. Section 430.6(A)(2) indicates the ampere rating (FLA) provided on the motor nameplate is used to size the overload protective devices that protects the motor, motor controller, and motor branch-circuit conductors. Overloads are not a fault condition, overloads happen when there is excessive current in the circuit. An overload is where the current is more than the equipment ampere rating and the overload may result in overheating and damaging equipment. Overload protection does not protect against short-circuits or ground-fault currents.

#3. As specified in the Code, where are you required to make the connection between the equipment grounding conductor and the grounded neutral conductor at a 208Y/120-volt, 3-phase, 4-wire service?


Deal Score0



Part II of Article 250 addresses the general requirements for system grounding and bonding of alternating-current systems to be grounded. Section 250.24(B) requires an unspliced main bonding jumper to connect the equipment grounding conductor and the service disconnect enclosure to the neutral (grounded conductor) within the enclosure. The size of the main bonding jumper is determined in accordance with Table 250.102(C)(1).

#4. Given: A hot tub is to located in the common area of a multifamily dwelling unit; a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) of the water recirculation and jet system is required to be installed for the users at a readily accessible location and NOT more than _____ from the hot tub.


Deal Score0



The provisions of Article 680 apply to the installation and wiring methods of storable or permanently installed swimming pools, hot tubs and spas, and to their metallic auxiliary equipment, such as pumps and similar equipment. Section 680.41 in Part II of Article 680 was initiated because, a local disconnecting device, not less than 5 ft. away from the hot tub, that is capable of being used in an emergency is needed for hot tubs and spas to allow rapid disconnection if someone becomes entrapped by the water recirculation system intake.

#5. The disconnecting means for air-conditioning or refrigeration equipment shall NOT be located _____.


Deal Score0



Article 440 applies to air-conditioning and refrigeration equipment and to branch circuits and controllers for the equipment. Section 440.14 prohibits the disconnecting means to be located on panels that are designed to allow access to the equipment or to obscure the equipment nameplate.

#6. The required support distance for exposed vertical rigid metal conduit (RMC) risers from industrial machinery or fixed equipment, where the RMC is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate is readily available is ___.


Deal Score0



The rules regarding the use and installation of rigid metal conduit (RMC) are found in Article 344. As per Section 344.30(A), as a general rule, RMC is required to be supported least every 10 feet and within 3 feet of each outlet box, junction box, panelboard or any similar cabinet unless otherwise permitted by 334.30(B). Section 334.30(B)(3) permits the exposed vertical risers of RMC from industrial machinery or fixed equipment to be supported at intervals of 20 feet when the conduit has threaded couplings, fastened at the top and bottom of the riser, and no other means of immediate support is readily available.

#7. When installing an emergency back-up generator with an output of 22 kW, single-phase, 120/240-volts for a farm house, the ampacity of phase conductors from the generator terminals to the first overcurrent protective device shall not be less than ____ of the nameplate current rating of the generator where the design of the generator does not prevent overloading.


Deal Score0



Article 445 contains installation and other requirements for generators. Section 445.13 specifies, the ampacity of the conductors from the generator terminals to the first overcurrent protection shall not be less than 115 percent of the nameplate current rating of the generator. Apply the single-phase current formula to solve this problem. I = P ÷ E

Join Other Email Learners

Follow the guide on landing page

I =  22 kw x 1000  = 22,000  = 92 amperes x 1.15 = 106 amperes
240 volts            240

#8. For freestanding type, cord-and plug connected office furnishings, which of the following is NOT permitted?


Deal Score0



Article 605 covers electrical equipment, wiring methods and conductors installed in office furnishings. Section 605.9(D) does not permit an individual office furnishing to contain multiwire circuits. Although multiwire branch circuits are not permitted in cord-connected office furnishings, they may be supplied by one phase of a multiwire branch circuit.

#9. According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in trade sizes larger than _____.


Deal Score0



Part VI of Article 250 explains the wiring methods an installation requirements for equipment grounding and equipment grounding conductors. Section 250.118 lists the approved types of equipment grounding conductors. 250.118(5)c. specifies where flexible metal conduit (FMC) exceeds trade size 1¼ in. it is not approved for use as an equipment grounding conductor and an additional wire-type equipment grounding conductor needs to be installed in the flex.

#10. What is the MINIMUM size wire-type copper equipment grounding conductor required for a 20-ampere rated branch circuit installed in PVC conduit that supplies a swimming pool pump motor?


Deal Score0



Part II of Article 680 applies to the rules governing the installation and wiring methods of permanently installed swimming pools. Section 680.21(A) mandates when wiring a swimming pool pump motor, the raceway containing the supply conductors shall also contain an insulated copper equipment grounding conductor not smaller than 12 AWG in order to have an effective ground-fault path.

FINISH ATTEMPT

Results

-

HD Quiz powered by harmonic design

Improve Your Skills As An Engineer


DISCLAIMER: Courses on Future Syllabus are free but subject to return to their original prices on host platforms upon coupon expiration. Enrol while they are free. To report any error, use the "Further Actions" tab.




Further Actions

Add to wishlist0


Rate below:
0
Show full profile

Editor

Certified Computer Engineer & Author, 'Lost Boys'. I believe in the influence of right information. Join me on Twitter.

Stay active

Leave a Reply

Future Syllabus
Logo
Register New Account
Login/Register via your social accounts (fully secured)

or proceed manually
Reset Password