Download IEC YEAR 3 FINAL EXAM TEST BANK | 1000+ QUESTIONS AND CORRECT ANSWERS | VERIFIED ANSWERS and more Exams Electrodynamics in PDF only on Docsity!
IEC YEAR 3 FINAL EXAM TEST BANK |
1000+ QUESTIONS AND CORRECT
ANSWERS | VERIFIED ANSWERS |
ALREADY GRADED A+ | LATEST
VERSION
A single-phase, 240-volt, residential, central air-conditioning unit has a compressor with an RLC of 28.9 amps, and a 1/4 hp fan. The nameplate shows that the blower fan has an FLA of 1.7 amps, the minimum circuit ampacity is 37.9 amps, and the maximum fuse or circuit breaker size is 60 amps. The maximum size fuses that can be installed for the unit are ___ A. The cable conductors have THHN/THWN insulation. Select one: a. b. c. d. e.70 ------CORRECT ANSWER---------------a. 60 A single-phase, 240-volt, residential, central air-conditioning unit has a compressor with an RLC of 18.9 amps, and a 1/4 hp fan. The nameplate shows that the minimum circuit ampacity is 29.1 amps and the maximum fuse or circuit breaker size is 45 amps. The maximum size fuses that can be installed for the unit are ___ A. The cable conductors have THHN/THWN insulation. Select one: a. b. c. d. e.45 ------CORRECT ANSWER---------------e. 45
A(n) ___ refrigerant motor-compressor is a combination compressor and motor in the same housing, having no external shaft or shaft seals, with the motor operating in the refrigerant. Select one: a.controlled b.combination c.hermetic d.multimotor ------CORRECT ANSWER---------------c. hermetic Refer to the nameplate shown in Figure 233.133. The largest fuse you could install in a fused safety switch is ___ A. Select one: a. b. c. d. e.fuses not permitted ------CORRECT ANSWER---------------e. fuses not permitted Refer to the nameplate shown in Figure 233.133. A nonfused safety switch with a voltage rating of 250 volts ___ to be used as the disconnecting means for this unit. Select one: a.is permitted b.is not permitted ------CORRECT ANSWER---------------b. is not permitted Refer to the nameplate shown in Figure 233.134. The largest circuit breaker you could install is ___ A.
A fire pump is permitted to be supplied by ___ the main distribution (service) panel. Select one: a.a circuit breaker in b.a fused safety switch connected ahead of c.either a or b d.neither a nor b ------CORRECT ANSWER---------------b. a fused safety switch connected ahead of The OCPDs protecting circuits for supervised fire pumps are selected to ___. Select one: a.carry LRC for an indefinite period b.permit the pump to burn up before the OCPDs open c.both a & b d.neither a nor b ------CORRECT ANSWER---------------c. both a & b Supply conductors to fire pumps are installed according to the requirements of Article ___. Select one: a. b. c. d.240 ------CORRECT ANSWER---------------c. 230 When circuit conductors are installed in conduit between the disconnecting means and the fire pump, both of which are located within the building, these conduits shall be ___. Select one: a.encased in at least 2" of concrete
b.painted red and properly labeled c.either a or b d.neither a nor b ------CORRECT ANSWER---------------a. encased in at least 2" of concrete Article 695 includes voltage drop requirements that are ___. Select one: a.mandatory b.recommended ------CORRECT ANSWER---------------a. mandatory Energized parts within control cabinets and other control enclosures used for fire pump systems shall be ___. Select one: a.located at least 12" above the floor level b.separated from the fire pump by a wall with at least a 1-hour fire rating c.both a & b d.neither a nor b ------CORRECT ANSWER---------------a. located at least 12" above the floor level Fire pump supply conductors on the load side of the final disconnecting means and overcurrent devices shall be permitted to be routed through a building if they are ___. Select one: a.encased by at least 2 inches of concrete b.protected by a fire-rated assembly listed to achieve a minimum fire rating of 2 hours and dedicated to the fire pump circuit c.a listed electrical circuit protective system with a minimum 2-hour fire rating d.any of these ------CORRECT ANSWER---------------d. any of these
Contractors cannot require any employee to work in any working conditions that are ___ and could affect their health or safety. Select one: a.hazardous b.unsanitary c.either a or b d.neither a nor b ------CORRECT ANSWER---------------c. either a or b The OSHA section for general safety and health has requirements for many topics. Included among these are requirements for ___. Select one: a.first aid b.accident prevention c.safety training d.all of these ------CORRECT ANSWER---------------d. all of these If employees are required to handle or use ___, they shall be trained regarding the safe handling and use of these. Select one: a.poisons b.caustics c.either a or b d.neither a nor b ------CORRECT ANSWER---------------c. either a or b Defective tools, material or equipment shall be identified as unsafe by ___. Select one: a.physically removing them from the place of use b.locking the controls to render them inoperable c.tagging d.any of these ------CORRECT ANSWER---------------d. any of these
OSHA defines a competent person as someone who ___. Select one: a.is capable of identifying existing and predictable hazards in the surroundings b.is capable of identifying working conditions which are unsanitary, hazardous or dangerous to employees c.has the authority to make prompt corrective actions to eliminate hazards d.all of these ------CORRECT ANSWER---------------d. all of these Safety programs include provisions for frequent and regular inspections of construction ___. These are performed by competent persons designated by the employers. Select one: a.equipment b.jobsites c.materials d.all of these ------CORRECT ANSWER---------------d. all of these Only those employees who are qualified by ___ are permitted to operate equipment or machinery. Select one: a.training b.experience c.either a or b d.neither a nor b ------CORRECT ANSWER---------------either a or b It is the responsibility of the ___ to initiate programs as may be necessary to comply with the OSHA requirements.
The NEMA or industry standard symbol for a SPST NO, single-break switch is shown at ___ in Figure 320.12. Select one: a.V b.II c.I d.IV e.III ------CORRECT ANSWER---------------a. V ___ is a type of overload relay used in a motor start. a. Melting allow b. Bimetallic c. Magnetic d. All of these ------CORRECT ANSWER---------------All of these A melting allow overload in a magnetic motor starter ____. Select one: a. actuates when excessive motor circuit current is present and opens only the affected motor circuit power contacts on the starter b. must be replaced after it operates c. can be reset immediately after it operates d. actuates when excessive motor circuit current is present and opens the control circuit to de-energize the coil e. actuates when excessive control circuit current is present and opens the control circuit to de-energize the coil ------CORRECT ANSWER--------------- actuates when excessive motor circuit current is present and opens the control circuit to de-energize the coil A 240-volt, 3Φ motor would require a starter with a minimum of ___ power pole(s) to open the circuit. Select one:
a. 3 b. 1 c. 2 ------CORRECT ANSWER--------------- 3 Refer to Figure 321.13 Symbol S is a ___. Select one: a. circuit interrupter (or breaker) b. disconnect (or safety switch) c. circuit breaker with thermal OLs d. circuit breaker with magnetic OLs e. circuit breaker with thermal and magnetic OLs ------CORRECT ANSWER---------------disconnect (or safety switch) Inherent motor protection devices are built into the motor and are reset ___. Select one: a. manually b. automatically ------CORRECT ANSWER---------------automatically Inherent motor protection devices are built into the ___ and are reset automatically. Select one: a. motor b. starter ------CORRECT ANSWER---------------motor When light strings are utilized on a construction site, empty sockets or sockets with shattered lamps should be replaced ___ after being reported. Select one:
Select one: a. 16 b. 8 c. 12 d. 10 e. 6 1/2 ------CORRECT ANSWER--------------- 8 During the period of construction, ___ foot candles are required in electrical equipment rooms. Select one: a. 3 b. 30 c. 5 d. 10 e. 12 ------CORRECT ANSWER--------------- 10 To provide convenience receptacles and lighting for temporary construction sites, a minimum of __ circuits are required. Select one: a. two b. one c. three d. five ------CORRECT ANSWER---------------two A dual-voltage motor could be a __ motor. Select one: a. 120- or 240-volt, 1Φ b. 240- or 480-volt, 1Φ c. 240- or 480-volt, 3Φ d. any of these ------CORRECT ANSWER---------------any of these
When a dual-voltage motor is connected to a high-voltage circuit, the __ current is less than it would be if connected to a low voltage circuit. Select one: a. line b. winding c. both a & b ------CORRECT ANSWER---------------line A dual-voltage motor was connected to a low-voltage circuit. Later, the circuit was replaced with a high-voltage circuit. After the motor was reconnected to the circuit, the line current ___. Select one: a. has not changed b. is now lower c. is now high ------CORRECT ANSWER---------------is now lower A dual-voltage motor was connected to a low voltage circuit. Later, the circuit was replaced with a high-voltage circuit. After the motor was reconnected to the circuit, the current through each motor winding ___. Select one: a. has not changed b. is now lower c. is now higher ------CORRECT ANSWER---------------has not changed The windings of 230/460-volt, dual-voltage, wye-wound motors are connected in ___ when the supply circuit is 480 volts. Select one: a. series b. parallel ------CORRECT ANSWER---------------series
Whenever materials are dropped more than 20 feet at any point lying outside the exterior walls of the building, a(n) ___ is required. Select one: a. enclosed chute b. hand truck c. dumpster d. elevator ------CORRECT ANSWER---------------enclosed chute Lumber shall be stacked on a level surface so that the4 stack is ___. Select one: a. stable b. self-supporting c. both a and b ------CORRECT ANSWER---------------stable and self- supporting Stored bricks shall not be stacked more than ___ feet high. Select one: a. 16 b. 20 c. 3 d. 7 ------CORRECT ANSWER--------------- 7 Structual steal, pipes, poles,. bar stock, and other ___ materials, unless racked, shall be stacked and blocked so as to prevent spreading or tilting. Select one: a. flat b. triangular c. rectangular
d. hex-shaped e. square d. cylindrical ------CORRECT ANSWER---------------cylindrical For any debris dropped through floors without the use of chutes, the area onto which the material is dropped shall be barricaded to a height of not less than ___ inches and 6 feet back from the opening. Select one: a. 72 b. 96 c. 60 d. 42 ------CORRECT ANSWER--------------- 42 All materials stores in tiers shall be stacked, racked, blocked, interlocked, or otherwise secured to prevent ___. Select one: a. sliding b. falling c. collapse d. all of these ------CORRECT ANSWER---------------all of these Each employee required to work in ranks, ___, and similar storage areas shall be equipped with peronal fall-arrest equipment. I. hoppers II. silos Select one: a. I only b. II only c. either I or II d. neither I nor II ------CORRECT ANSWER---------------either hoppers or silos
Select one: a. I & II b. II & III c. I & IV d. III & IV ------CORRECT ANSWER---------------2 contactors, 1 OL section A manual reversing starter requires ___ OL section(s). Select one: a. one b. two ------CORRECT ANSWER---------------two Internal drum switch connections are made between terminals 5 and 6 when the switch is in the ___ position. Select one: a. Forward b. Reverse c. both a and b d. neither a nor b ------CORRECT ANSWER---------------Forward and Reverse The control switching for a reversing starter can consist of ___. Select one: a. a stop PB, a start PB, and a forward/reverse selector switch b. a stop PB, a forward PB, and a reverse PB c. either a or b d. neither ------CORRECT ANSWER---------------either a or b Highway construction fatalities rarely include instances of workers being struck by moving vehicles.
Select one: a. True b. False ------CORRECT ANSWER---------------False Between 2003-2017 there were ____ deaths in highway construction in the U.S. Select one: a. 1, b. 66, c. 131, d. 1,844 ------CORRECT ANSWER---------------1, Over a period of recent years, there has been a(n) __ in the number of highway construction projects. Select one: a. decrease b. increase ------CORRECT ANSWER---------------increase On road construction projects, flaggers must wear vests that are ___ any barricades. Select one: a. the same color as b. a different color than ------CORRECT ANSWER---------------a different color than When the public drives past a highway construction project, these drivers pose no danger to the construction workers.
