# Know the effects of components

Quiz by , created over 5 years ago

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 Created by brightsparky79 over 5 years ago
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### Question 1

Question
Which of the following formulas can calculate power in an ac circuit?
• P = V x I x pf
• P = V + I
• P = V x I
• P = V/R

### Question 2

Question
What is the power produced by a 400v three phase system which delivers 25A at a power factor of 0.85
• 14.72kW
• 6.23kW
• 10kW
• 14kW

### Question 3

Question
What is the power produced by a 400v three phase system which delivers 10A at a power factor of 0.7
• 4849.6W
• 4.7kW
• 5000W
• 4700W

### Question 4

Question
The power factor of an installation can be calculated from
• Cosθ = Z/X
• Cosθ = X/Z
• Cosθ = KVA/KW
• Cosθ = KW/KVA

### Question 5

Question
The power factor of an inductive load can be improved by?
• Connecting a inductor across the load
• Connecting a resistor in parallel with the load
• Connecting a capacitor in series with the load
• Connecting a capacitor across the load (parallel)

### Question 6

Question
The power factor of a load consisting of inductance and resistance can be calculated from
• Cosθ = True Power/Apparent Power
• Cosθ = Apparent Power/ Reactive Power
• Cosθ = Reactive Power/True Power
• Cosθ = Apparent Power/True Power

### Question 7

Question
The formula required to calculate the total power of a single phase inductive load supplied by an a.c. supply is
• P = IV sinθ
• P = IV
• P = IV tanθ
• P = IV cosθ

### Question 8

Question
If the W is 100 and the VA is 120 what would the power factor be
• 0.75
• 0.2
• 0.85
• 0.83

### Question 9

Question
If the kW is 200 and the KVA is 400 what would the power factor be?
• 0.6
• 0.7
• 0.8
• 0.5

### Question 10

Question
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
• 18.4 A
• 23.4 A
• 10.21 A
• 21.7 A

### Question 11

Question
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
• 17.8 A
• 17.39 A
• 4.3 A
• 8.7 A

### Question 12

Question
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
• 7.8 A
• 9.2 A
• 6.5 A
• 8.7 A

### Question 13

Question
A three phase system gives the following readings kVA =30 kW= 45 What is the power factor for the system
• 0.67
• unity
• 1.5
• 0.8

### Question 14

Question
A three phase system gives the following readings kW= 400 kVA = 500 What is the power factor for the system
• 1.25
• unity
• 0.8
• 0.6

### Question 15

Question
What unit is reactive power measured in
• kA
• KVAr
• kW
• KVA

### Question 16

Question
What unit is apparent power measured in
• kA
• KVAr
• kW
• KVA

### Question 17

Question
What unit is true power measured in
• KVAr
• kA
• kW
• KVA

### Question 18

Question
Which component would cause the current and voltage to behave as above
• resistor
• rectifier
• capacitor
• Inductor

### Question 19

Question
Which component would cause the current and voltage to behave as above
• Inductor
• capacitor
• resistor
• rectifier

### Question 20

Question
Which component would cause the current and voltage to behave as above