CFESA ELECTRICAL LATEST ACTUAL

CFESA ELECTRICAL LATEST ACTUAL

EXAM WITH REAL QUESTIONS

AND VERIFIED CORRECT ANSWERS |

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What. conductor material is used for high-temperature wire applications? - ANSWER- nickel or nickel tinned copper

What is the advantage of nickel-tinned copper wire? - ANSWER- handles high temp and higher current than nickel

What are the two major downfalls of pure nickel wire? - ANSWER- cost, and lower current capacity

what is TGGT wire made of? - ANSWER- nickel tinned copper wire, Teflon insulated with fiberglass braid

What is MGS wire made of? - ANSWER- Nickel tinned copper, mica insulated with fiberglass braid

which wire should be used on a pizza oven operating at 650 degrees? - ANSWER-

MGS 1 / 4

What is special about SO or SJO cord that makes it desirable in the commercial food service industry? - ANSWER- Grease and oil resistant

Ground wires must always be what color(s)? - ANSWER- Green, green with yellow tracer, or bare metal

Neutral wire(s) must always be what color? - ANSWER- White

what size THHN wire should be used for a 20 amp load? - ANSWER- 12 gauge

What size TGGT wire should be used for a 30 amp load? - ANSWER- 12 gauge

What size SO cord should be used for a 40 amp load? - ANSWER- 8 gauge

Give three common reasons for wire failures - ANSWER- undersized, temp rating too low, poor connections

Why must burned or discolored wire be replaced? - ANSWER- once burned or discolored the current carrying capacity drops significantly. Also, connections will overheat.

If you put new terminals on discolored wire what will happen? - ANSWER- they will burn off again

Many high temp wire insulations will turn dark, or brown after a short period of use in high ambient temps. What does this color change indicate? - ANSWER- The 2 / 4

wax coating on the wire has become hot from ambient conditions. this wire is usually still clean and fully functional.

Standard electric terminal clips are made of what materials? - ANSWER- Copper or brass

What happens to standard terminals when used in high-temperature applications? - ANSWER- they oxidize, weaken, and burn off

High-temp terminals are made of what materials? - ANSWER- nickel, nickel tinned steel, or plain steel

what is the disadvantage of using high-temperature female quick disconnect terminals? - ANSWER- they have no memory. Once put on they loose their tension, if pulled of again and reinstalled they will be loose.

What do the following prefixes mean? Micro, Kilo, Mega, Milli - ANSWER-

1/1,000,000, 1000, 1,000,000, 1/1000

If you know the wattage and voltage, how do you determine the current? - ANSWER- Divide the wattage by the voltage

If you know the voltage and current how do you determine the wattage? - ANSWER- Multiply voltage times current

If a circuit is supplied with 100 volts and the total resistance of the circuit is 200 ohms, how much current will the circuit draw? - ANSWER- .5 amps

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If a piece of equipment is supplied 208 volts and the amp meter clamped to the hotline reads 20 amps, what is the wattage of the load? - ANSWER- 4160 Watts

What is the max amp rating of an infinite switch? - ANSWER- 15 amps. in a heated area they handle no more than about 12 or 13 amps.

Do infinite switches hold up well when used and the max load rating? - ANSWER- no, the heat derates them

When replacing an infinite switch what else must you do? - ANSWER- replaces the wires and terminals to the switch

What are the two primary causes for failures of infinite switches? - ANSWER- burned wire connections and excessive ambient heat

What are the three critical things that must be matched if you substitute an infinite switch? - ANSWER- voltage, regular or broiler range, and mounting type

What effect does high ambient temps have on a switch? - ANSWER- derates it, cannot handle the marked amperage

If you are servicing a piece of equipment that uses multiple infinite switches, what will happen if the old switch is "B" rated and the new one is not? - ANSWER- the unit will not heat as hot as it did with the old switch when the knob is set to the same position

What will happen if the old switch is not "B" rated and the new one is? - ANSWER- the unit will get hotter than it did with the old switch when the knob is set to the same position

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