Principles of Star and Delta

brightsparky79
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
Tags No tags specified
brightsparky79
Created by brightsparky79 over 5 years ago
Mean, Median, and Mode Quiz
Lenna Nolan
Definitions and Area: Square, Rectangle, Cube, and Triangle
Oliver Balay
Unit 202 Revision: Electrical Science Question Bank 1
Jamie Parslow-Williams
Of Mice and Men
amyk4321
How did the Cold War develop?
Elisa de Toro Arias
Unit 202 Revision: Electrical Science Question Bank 1
Oliver Balay
Area and Circumference of a Circle Quiz
Oliver Balay
Mean, Median, and Mode Quiz
Oliver Balay
Mean, Median, Mode, and Range
Oliver Balay
Cylinders: Surface Area & Volume
Oliver Balay

Question 1

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

Question 10

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

Question 11

Question
Why is it important to balance three phase loads as evenly as possible across the three phases
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 1
  • 2
  • 3
  • 4

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

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

Question 22

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

Question 23

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

Question 24

Question
What formula would you use to calculate the Line voltage
Answer
  • 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
Answer
  • 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
Answer
  • 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
Answer
  • 1
  • 2
  • 3
  • 4

Question 28

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

Question 29

Question
From the diagram below, what does the number 4 represent
Answer
  • Phase Voltage
  • Phase Current
  • Line Voltage
  • Line Current