Quiz
Principles of Star and Delta
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Questions in this quiz (29)
1Which of the above values shows the line voltage for a star connected load
- AA
- BB
- CC
- DD
2Which of the following values would be the approximate value of line voltage for a delta connected load with a phase voltage of 900V
- A600V
- B519.6 V
- C1.56 kV
- D900V
3A three phase delta connected load has a phase voltage of 230V what would be the approximate line voltage
- A230 V
- B400 V
- C133 V
- D240 V
4In a star connected system what is the relationship between the line and phase voltage
- AV PHASE = V LINE x 1.732
- BV LINE = V PHASE x √3
- CV LINE = V PHASE/√3
- DV LINE = V PHASE
5Which of the following values would be the approximate value of phase voltage for a delta connected load with a line voltage of 400V
- A693.2 V
- B231.2 V
- C400 V
- D692.8 V
6Which of the above values shows the line current for a delta connected load
- AA
- BB
- CC
- DD
7Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 75A
- A34.7 A
- B60 A
- C129.90 A
- D104 A
8Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 60A
- A34.7 A
- B103.92 A
- C130 A
- D60.21 A
9Which of the below values shows the phase voltage for a star connected load
- AB
- BD
- CA
- DC
10Which of the above values shows the phase current for a delta connected load
- AA
- BB
- CC
- DD
11Why is it important to balance three phase loads as evenly as possible across the three phases
- Ato reduce the neutral current
- Bto improve the power factor
- Cto reduce the voltage
- Dto reduce disconnection times
12Which of the following would not require a neutral connection
- Asingle phase load
- Bthree phase unbalanced loads
- Cthree phase balanced loads
- DT.T system
13Which of the following values is the approximate neutral current for a balanced star connected load drawing 12 A per phase
- A20.78 A
- B36 A
- C0 A
- D12 A
14Which of the following values would be the approximate value of line current for a star connected load with a phase current of 110 A
- A75 A
- B110 A
- C43.3 A
- D130 A
15Which of the following values would be the approximate value of phase current for a star connected load with a line current of 90 A
- A155.9 A
- B90 A
- C51.96 A
- D30 A
16Which of the above meters shows the line voltage for a star connected load
- A1
- B2
- C3
- D4
17 Which of the above meters shows the phase voltage for a star connected load
- A1
- B2
- C3
- D4
18 Which of the above meters shows the phase current for a star connected load
- A1
- Bnone of the above
- C2
- D3
19What is the approximate value of line current for the delta system shown?
- A20A
- B6.7A
- C11.5A
- D34.6A
20What is the approximate value of phase current for the delta system shown?
- A34.6A
- B6.7A
- C11.5A
- D20A
21Which of the following is the phase voltage for the star system shown
- A60V
- B11.55V
- C34.64V
- D20V
22What is the approximate value of phase voltage for the delta system shown
- A87V
- B230V
- C260V
- D150V
23What is the approximate value of phase current for the delta system shown?
- A20A
- B6.71A
- C11.54A
- D34.6A
24What formula would you use to calculate the Line voltage
- AVLINE = 230 + √3
- BVLINE = 230/√3
- CVLINE = 230
- DVLINE = √3 x 230
25Three phase Star connected system provided with a neutral can be used for
- AThe connection of three phase loads
- BThe connection of delta loads
- CThe connection of an earth
- DThe connection of single phase loads
26In a star connected system what is the relationship between the line and phase current
- AI LINE = I PHASE /√3
- BV = I x R
- CI LINE = I PHASE x 1.732
- DI LINE = I PHASE
27From the following diagram what number represents the Line Current
- A1
- B2
- C3
- D4
28From the following diagram if number 1 is 11kV what would the value number 3 be
- A19kV
- B6.35kA
- C6.35kV
- D11kV
29From the diagram below, what does the number 4 represent
- APhase Voltage
- BPhase Current
- CLine Voltage
- DLine Current
Information
- Description
- 2 Electrical Science Quiz on Principles of Star and Delta, created by Vito Martino on 12/05/2014.
- Author
- Vito Martino
- Language
- English
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