871228
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Quiz von Vito Martino, aktualisiert more than 1 year ago
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Erstellt von Vito Martino
vor fast 10 Jahre
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Frage 1
Frage
Which of the following formulas can calculate power in an ac circuit?
Antworten
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P = V x I x pf
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P = V + I
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P = V x I
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P = V/R
Frage 2
Frage
What is the power produced by a 400v three phase system which delivers 25A at a power factor of 0.85
Antworten
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14.72kW
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6.23kW
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10kW
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14kW
Frage 3
Frage
What is the power produced by a 400v three phase system which delivers 10A at a power factor of 0.7
Antworten
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4849.6W
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4.7kW
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5000W
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4700W
Frage 4
Frage
The power factor of an installation can be calculated from
Antworten
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Cosθ = Z/X
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Cosθ = X/Z
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Cosθ = KVA/KW
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Cosθ = KW/KVA
Frage 5
Frage
The power factor of an inductive load can be improved by?
Antworten
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Connecting a inductor across the load
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Connecting a resistor in parallel with the load
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Connecting a capacitor in series with the load
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Connecting a capacitor across the load (parallel)
Frage 6
Frage
The power factor of a load consisting of inductance and resistance can be calculated from
Antworten
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Cosθ = True Power/Apparent Power
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Cosθ = Apparent Power/ Reactive Power
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Cosθ = Reactive Power/True Power
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Cosθ = Apparent Power/True Power
Frage 7
Frage
The formula required to calculate the total power of a single phase inductive load supplied by an a.c. supply is
Antworten
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P = IV sinθ
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P = IV
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P = IV tanθ
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P = IV cosθ
Frage 8
Frage
If the W is 100 and the VA is 120 what would the power factor be
Antworten
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0.75
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0.2
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0.85
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0.83
Frage 9
Frage
If the kW is 200 and the KVA is 400 what would the power factor be?
Antworten
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0.6
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0.7
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0.8
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0.5
Frage 10
Frage
A single phase circuit draws a current of 21.7A from a 230 V circuit at a power factor of 0.4
What is the current drawn if the power factor is corrected to 0.85
Antworten
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18.4 A
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23.4 A
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10.21 A
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21.7 A
Frage 11
Frage
A circuit dissipates 2000 W at a power factor of 0.5 when connected to a 230 V ac supply. The current drawn from the supply is
Antworten
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17.8 A
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17.39 A
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4.3 A
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8.7 A
Frage 12
Frage
A circuit dissipates 1.5 kW at a power factor of 0.75 when connected to a 230V ac supply. The current drawn from the supply is
Antworten
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7.8 A
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9.2 A
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6.5 A
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8.7 A
Frage 13
Frage
A three phase system gives the following readings
kVA =30 kW= 45
What is the power factor for the system
Antworten
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0.67
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unity
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1.5
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0.8
Frage 14
Frage
A three phase system gives the following readings
kW= 400 kVA = 500
What is the power factor for the system
Antworten
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1.25
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unity
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0.8
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0.6
Frage 15
Frage
What unit is reactive power measured in
Antworten
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kA
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KVAr
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kW
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KVA
Frage 16
Frage
What unit is apparent power measured in
Antworten
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kA
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KVAr
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kW
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KVA
Frage 17
Frage
What unit is true power measured in
Antworten
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KVAr
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kA
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kW
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KVA
Frage 18
Frage
Which component would cause the current and voltage to behave as above
Image:
Slide2.JPG (image/JPG)
Antworten
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resistor
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rectifier
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capacitor
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Inductor
Frage 19
Frage
Which component would cause the current and voltage to behave as above
Image:
Slide1.JPG (image/JPG)
Antworten
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Inductor
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capacitor
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resistor
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rectifier
Frage 20
Frage
Which component would cause the current and voltage to behave as above
Image:
Slide3.JPG (image/JPG)
Antworten
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Inductor
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capacitor
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resistor
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rectifier
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