Grossmont College Electrical Power and Voltage Unbalance Questionnaire: Engineering Answers 2021

Grossmont College Electrical Power and Voltage Unbalance Questionnaire: Engineering Answers 2021

Question Title:

Grossmont College Electrical Power and Voltage Unbalance Questionnaire

Full Question:

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15) If 125 HP is needed to lift water (water horsepower) and the pump is 70% efficient, how
much brake horsepower is needed?
a) 178.57 HP
b) 587.66 HP
c) 355.2 HP
d) none of the above
16) If the motor used above is 90% efficient, how much electrical power is needed? Show
answer in both Horsepower and Kilowatts.
18) Calculate the payback time if an old 100 HP motor that is 84% efficient is replaced with a
95% efficient motor. The motor has an average runtime of ten hours a day and energy costs
$0.22/KWhr. The new motor has a cost of $3,500.
Step 1: convert 100 HP to KW and divide by motor efficiency for both motors
Step 2: use the motor run time formula from the State of California sheet
Step 3: subtract the two run time costs to find the daily savings
Step 4: divide the $3,500 by daily savings to the number of days to pay back
19) Calculate the voltage unbalance for the following voltages. L1 460, L2 467 and L3 450.show
the steps
20) Calculate the voltage unbalance for the following voltages. L1 490, L2 489 and L3 485.show
the steps

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