871228
Descrição
Quiz por Vito Martino, atualizado more than 1 year ago
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Criado por Vito Martino
mais de 10 anos atrás
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Questão 1
Questão
Which of the following formulas can calculate power in an ac circuit?
Responda
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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
Questão 2
Questão
What is the power produced by a 400v three phase system which delivers 25A at a power factor of 0.85
Responda
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14.72kW
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6.23kW
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10kW
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14kW
Questão 3
Questão
What is the power produced by a 400v three phase system which delivers 10A at a power factor of 0.7
Responda
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4849.6W
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4.7kW
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5000W
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4700W
Questão 4
Questão
The power factor of an installation can be calculated from
Responda
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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
Questão 5
Questão
The power factor of an inductive load can be improved by?
Responda
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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)
Questão 6
Questão
The power factor of a load consisting of inductance and resistance can be calculated from
Responda
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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
Questão 7
Questão
The formula required to calculate the total power of a single phase inductive load supplied by an a.c. supply is
Responda
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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
Questão 8
Questão
If the W is 100 and the VA is 120 what would the power factor be
Responda
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0.75
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0.2
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0.85
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0.83
Questão 9
Questão
If the kW is 200 and the KVA is 400 what would the power factor be?
Responda
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0.6
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0.7
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0.8
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0.5
Questão 10
Questão
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
Responda
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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
Questão 11
Questão
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
Responda
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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
Questão 12
Questão
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
Responda
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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
Questão 13
Questão
A three phase system gives the following readings
kVA =30 kW= 45
What is the power factor for the system
Responda
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0.67
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unity
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1.5
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0.8
Questão 14
Questão
A three phase system gives the following readings
kW= 400 kVA = 500
What is the power factor for the system
Responda
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1.25
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unity
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0.8
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0.6
Questão 15
Questão
What unit is reactive power measured in
Responda
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kA
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KVAr
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kW
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KVA
Questão 16
Questão
What unit is apparent power measured in
Responda
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kA
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KVAr
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kW
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KVA
Questão 17
Questão
What unit is true power measured in
Responda
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KVAr
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kA
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kW
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KVA
Questão 18
Questão
Which component would cause the current and voltage to behave as above
Image:
Slide2.JPG (image/JPG)
Responda
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resistor
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rectifier
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capacitor
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Inductor
Questão 19
Questão
Which component would cause the current and voltage to behave as above
Image:
Slide1.JPG (image/JPG)
Responda
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Inductor
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capacitor
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resistor
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rectifier
Questão 20
Questão
Which component would cause the current and voltage to behave as above
Image:
Slide3.JPG (image/JPG)
Responda
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Inductor
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capacitor
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resistor
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rectifier
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