 # Principles of Star and Delta

Quiz by , created over 5 years ago

## 2 Electrical Science Quiz on Principles of Star and Delta, created by brightsparky79 on 05/12/2014. 1002 2 0 No tags specified Created by brightsparky79 over 5 years ago
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### Question 1

Question
Which of the above values shows the line voltage for a star connected load
• A
• B
• C
• D

### Question 2

Question
Which of the following values would be the approximate value of line voltage for a delta connected load with a phase voltage of 900V
• 600V
• 519.6 V
• 1.56 kV
• 900V

### Question 3

Question
A three phase delta connected load has a phase voltage of 230V what would be the approximate line voltage
• 230 V
• 400 V
• 133 V
• 240 V

### Question 4

Question
In a star connected system what is the relationship between the line and phase voltage
• V PHASE = V LINE x 1.732
• V LINE = V PHASE x √3
• V LINE = V PHASE/√3
• V LINE = V PHASE

### Question 5

Question
Which of the following values would be the approximate value of phase voltage for a delta connected load with a line voltage of 400V
• 693.2 V
• 231.2 V
• 400 V
• 692.8 V

### Question 6

Question
Which of the above values shows the line current for a delta connected load
• A
• B
• C
• D

### Question 7

Question
Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 75A
• 34.7 A
• 60 A
• 129.90 A
• 104 A

### Question 8

Question
Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 60A
• 34.7 A
• 103.92 A
• 130 A
• 60.21 A

### Question 9

Question
Which of the below values shows the phase voltage for a star connected load
• B
• D
• A
• C

### Question 10

Question
Which of the above values shows the phase current for a delta connected load
• A
• B
• C
• D

### Question 11

Question
Why is it important to balance three phase loads as evenly as possible across the three phases
• to reduce the neutral current
• to improve the power factor
• to reduce the voltage
• to reduce disconnection times

### Question 12

Question
Which of the following would not require a neutral connection
• single phase load
• three phase unbalanced loads
• three phase balanced loads
• T.T system

### Question 13

Question
Which of the following values is the approximate neutral current for a balanced star connected load drawing 12 A per phase
• 20.78 A
• 36 A
• 0 A
• 12 A

### Question 14

Question
Which of the following values would be the approximate value of line current for a star connected load with a phase current of 110 A
• 75 A
• 110 A
• 43.3 A
• 130 A

### Question 15

Question
Which of the following values would be the approximate value of phase current for a star connected load with a line current of 90 A
• 155.9 A
• 90 A
• 51.96 A
• 30 A

### Question 16

Question
Which of the above meters shows the line voltage for a star connected load
• 1
• 2
• 3
• 4

### Question 17

Question
Which of the above meters shows the phase voltage for a star connected load
• 1
• 2
• 3
• 4

### Question 18

Question
Which of the above meters shows the phase current for a star connected load
• 1
• none of the above
• 2
• 3

### Question 19

Question
What is the approximate value of line current for the delta system shown?
• 20A
• 6.7A
• 11.5A
• 34.6A

### Question 20

Question
What is the approximate value of phase current for the delta system shown?
• 34.6A
• 6.7A
• 11.5A
• 20A

### Question 21

Question
Which of the following is the phase voltage for the star system shown
• 60V
• 11.55V
• 34.64V
• 20V

### Question 22

Question
What is the approximate value of phase voltage for the delta system shown
• 87V
• 230V
• 260V
• 150V

### Question 23

Question
What is the approximate value of phase current for the delta system shown?
• 20A
• 6.71A
• 11.54A
• 34.6A

### Question 24

Question
What formula would you use to calculate the Line voltage
• VLINE = 230 + √3
• VLINE = 230/√3
• VLINE = 230
• VLINE = √3 x 230

### Question 25

Question
Three phase Star connected system provided with a neutral can be used for
• The connection of three phase loads
• The connection of delta loads
• The connection of an earth
• The connection of single phase loads

### Question 26

Question
In a star connected system what is the relationship between the line and phase current
• I LINE = I PHASE /√3
• V = I x R
• I LINE = I PHASE x 1.732
• I LINE = I PHASE

### Question 27

Question
From the following diagram what number represents the Line Current
• 1
• 2
• 3
• 4

### Question 28

Question
From the following diagram if number 1 is 11kV what would the value number 3 be
• 19kV
• 6.35kA
• 6.35kV
• 11kV

### Question 29

Question
From the diagram below, what does the number 4 represent