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NABTEB 2022 ELECTRICAL INSTALLATION-AND MAINTENANCE WORK-ANSWERS

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NABTEB 2022 ELECTRICAL INSTALLATION-AND MAINTENANCE WORK-ANSWERS-EXAMKING.NET
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ELECTRICAL INSTALLATION-AND MAINTENANCE- OBJ-EXAMKING.NET
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COMING SOON!
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ELECTRICAL INSTALLATION-AND MAINTENANCE WORK-ANSWERS-EXAMKING.NET
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PART I
Pick 2 questions out of 1 to 3
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(1a)Pick 5 Only!
(i) Avoid water at all times when working with electricity.
(ii) If you are working on any receptacle at your home then always turn off the mains.


(iii) Never use equipment with frayed cords, damaged insulation or broken plugs.
(iv) Always use appropriate insulated rubber gloves and goggles while working on any branch circuit or any other electrical circuit.
(v) Electrical hazards include exposed energized parts and unguarded electrical equipment which may become energized unexpectedly.
(vi) Always use insulated tools while working.
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(2a) (pick 4)
i) Open Drip Proof (ODP)
ii) Totally Enclosed Fan Cooled (TEFC)
iii) Totally Enclosed Air Over (TEAO)
iv) Totally Enclosed Non-Ventilated (TENV)
v) Totally Enclosed Force Ventilated (TEFV)/ Totally Enclosed Blower Cooled (TEBC)
(2b) A duct is a fully enclosed tube or pipe that carries liquid or air in and out of buildings or through the body. WHEREAS
a trunking system is a fully accessible, rectilinear box section used solely in lengths for the protection and routing of cables on the surface in, around and out of buildings and not through a body.


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(3a)
electric grid is a network of synchronized power providers and consumers that are connected by transmission and distribution lines and operated by one or more control centers.
(3b)
(i) Exchange of peak loads
(2) Use of Older Plants
(3) Ensures economical operation
(4) Increases diversity factor
(5) Reduces plant reserve capacity
(3c)
N/B: TABULATE THE DIFFERENCES IN THE EXAM SCRIPT
Flexible metal conduit (FMC) has a spiral construction that enables it to snake through walls and other structures.
*WHILE*
heavy gauge conduit system Wiring an installation in conduit can be defined as running insulated cables in protective tubes from the supply to the load.
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(Part II)
Pick 2 questions out of 4, 5 and 6
(4a)
i) Twisting the wires together
ii) and soldering
(4b)
Brazing is a metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal.
(5a) (pick 5)
i) Always wear protective eyewear and gloves.
ii) Eliminate sources of sparks or flames.
iii) Keep metal tools and jewelry away from batteries.
iv) Use caution when removing a lead-acid battery.
v) Keep a neutralizing solution close by.
vi) Use the correct type of charger.
(5b)
i) constant voltage (CV) charging method
ii) constant current (CC) charging method
iii) mixed constant current or mixed constant voltage (CC/CV) charging method
iv) pulse charging method (CP).
(5c)
A cell is a single electrical energy source which uses chemical reactions to produce a current.
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PART III
Pick 2 questions out of 7, 8 and 9
(7a)
Coming
(7b)
(i) Poor Productivity
(ii) Hazardous Job Sites
(iii) Wasted Money
(iv) Inability to Scale
(v) Damaged Professional Reputation
(9a)
i) Class-Y Insulation:
Class-Y insulations can withstands a temperature of up to 90°C and it is typically made of cotton, silk, or paper.
ii) Class-A Insulation:
Class-A insulations can withstands a temperature of up to 105°C. It is made of reinforced Class-Y materials with impregnated varnish or insulation oil.
iii) Class-E Insulation:
Class-E insulations can withstands a temperature of up to 120°C.
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Completed!!!
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