AC Sys, Lvl 1 - Lesson 4: Making Circuit
Calculations for Basic Systems
A motor was overheating because of low voltage at its terminals. A transformer was
installed to correct the problem. What is the secondary voltage of the transformer
required to be in order to supply 240 volts to the motor? (Round the FINAL answer to
one decimal place.) - correct answer-263.3V
Conductor resistance causes a(n) ? between the voltage source and the connected
load. - correct answer-All of the above
How could you correct a voltage drop problem involving two rows of fluorescent
fixtures fed from the same circuit in a practical manner? I. Change the fluorescent
fixtures to incandescent light fixtures. II. Install a lighting panel closer to the fixtures.
III. Install larger wire. IV. Put each row of fixtures on a separate circuit. - correct
answer-III or IV
How much power is consumed by the load under short-circuit conditions? - correct
answer-0W
If a generator voltage is 240 volts, and the load voltage is 235 volts, how much
voltage is dropped on the line? - correct answer-5V
Loads are normally connected in ? with the source, and the resistance of the line is
in ? with the source. - correct answer-Parallel/Series
, The NEC recommends that voltage drops on branch circuits not exceeding ? at the
farthest outlet of power, for heating or lighting loads, will provide for reasonable
efficiency of operation. - correct answer-3%
The total circuit current equals the current of the loads. - correct answer-True
The total power consumed by the circuit is equal to the power consumed by the
loads. - correct answer-False
Two rows of fluorescent lamps are installed in an office on the same branch circuit,
with each row drawing 12.5 amperes. The source voltage is 277 volts, and the line
resistance is 0.5 Ω. The wire used has a constant (k) of 12.6. If the load is 129 feet
from the source, what is the specific wire size used in this installation? (Assume
75°C wire.) - correct answer-12 AWG
Two rows of fluorescent lamps are installed in an office on the same branch circuit,
with each row drawing 12.5 amperes. The source voltage is 277 volts, and the line
resistance is 0.5 Ω. The wire used has a constant (k) of 12.6. If the load is 130 feet
from the source, what size wire would you need to install for this circuit to meet the
recommendations of the NEC for acceptable voltage drop on a branch circuit?
(Assume 75°C wire) - correct answer-10 AWG
Two rows of fluorescent lamps are installed in an office on the same branch circuit,
with each row drawing 12.5 amperes. The source voltage is 277 volts, and the line
resistance is 0.5 Ω. The wire used has a constant (k) of 12.6. The voltage drop will
be within the recommendation of the NEC. - correct answer-False
Two rows of fluorescent lamps are installed in an office on the same branch circuit,
with each row drawing 12.5 amperes. The source voltage is 277 volts, and the total
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