Test
Principles of Star and Delta
Este test tiene tiempo límite, así que se abre en el reproductor de siempre.
Preguntas del test (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
Información
- Descripción
- 2 Electrical Science Test sobre Principles of Star and Delta, creado por Vito Martino el 12/05/2014.
- Autor
- Vito Martino
- Idioma
- English
- Visitas
- 1.108
- Etiquetas
- Valoración
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