CFESA ELECTRICAL UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

CFESA ELECTRICAL UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS

Question:
What do the following prefixes mean? Micro,Kilo,Mega,Milli
Answer:
1/1,000,000, 1000, 1,000,000, 1/1000

Question:
If you know the wattage and voltage, how do you determine the current?
Answer:
Divide the wattage by the voltage

Question:
If you know the voltage and current how do you determine the wattage?
Answer:
Multiply voltage times current

Question:
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

Question:
If a piece of equipment is supplied 208 volts and the amp meter clamped to the hot line reads 20 amps,
what is the wattage of the load?
Answer:
4160 Watts

Question:
How much voltage is in one hot line?
Answer:
None

Question:
What happens to current in a parallel circuit?
Answer:
It divides across resistances

Question:
what happens to voltage across the loads in a parallel circuit?
Answer:
stays the same

, Question:
what happens to the voltage across the loads in a series circuit?
Answer:
it divides across the resistances

Question:
what happens to the current in a series circuit?
Answer:
It stays the same everywhere

Question:
in a parallel circuit the total resistance of the circuit will always be less than what resistance?
Answer:
the smallest resistance

Question:
how do you find the total resistance of a series circuit?
Answer:
add the resistances together

Question:
how do you find the total resistance of a parallel circuit?
Answer:
1/RT = 1/R1 + 1/R2 + 1/R3 ...

Question:
If a circuit is wired parallel, and the supply voltage is 120 volts, each load must be rated at what voltage?
Answer:
120 volts

Question:
if a circuit has two elements wired in series, and each is rated at 120 volts, what voltage must be supplied
to the circuit in order for the elements to heat at full power?
Answer:
240 volts

Question:
What is the advantage of using higher voltages?
Answer:
Lower Current and wire size

Question:
Is there a negative and positive line in AC power supplies?
Answer:
No