Know the effects of components

brightsparky79
Quiz by , created over 5 years ago

Leading and lagging circuits

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brightsparky79
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?
Answer
  • 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
Answer
  • 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
Answer
  • 4849.6W
  • 4.7kW
  • 5000W
  • 4700W

Question 4

Question
The power factor of an installation can be calculated from
Answer
  • 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?
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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?
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 1.25
  • unity
  • 0.8
  • 0.6

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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