863578
Descripción
Test por Vito Martino, actualizado hace más de 1 año
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Creado por Vito Martino
hace más de 10 años
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Pregunta 1
Pregunta
Which of the above values shows the line voltage for a star connected load
Image:
Slide1.JPG (image/JPG)
Respuesta
-
A
-
B
-
C
-
D
Pregunta 2
Pregunta
Which of the following values would be the approximate value of line voltage for a delta connected load with a phase voltage of 900V
Respuesta
-
600V
-
519.6 V
-
1.56 kV
-
900V
Pregunta 3
Pregunta
A three phase delta connected load has a phase voltage of 230V what would be the approximate line voltage
Respuesta
-
230 V
-
400 V
-
133 V
-
240 V
Pregunta 4
Pregunta
In a star connected system what is the relationship between the line and phase voltage
Respuesta
-
V PHASE = V LINE x 1.732
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V LINE = V PHASE x √3
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V LINE = V PHASE/√3
-
V LINE = V PHASE
Pregunta 5
Pregunta
Which of the following values would be the approximate value of phase voltage for a delta connected load with a line voltage of 400V
Respuesta
-
693.2 V
-
231.2 V
-
400 V
-
692.8 V
Pregunta 6
Pregunta
Which of the above values shows the line current for a delta connected load
Image:
Slide2.JPG (image/JPG)
Respuesta
-
A
-
B
-
C
-
D
Pregunta 7
Pregunta
Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 75A
Respuesta
-
34.7 A
-
60 A
-
129.90 A
-
104 A
Pregunta 8
Pregunta
Which of the following values would be the approximate value of line current for a delta connected load with a phase current of 60A
Respuesta
-
34.7 A
-
103.92 A
-
130 A
-
60.21 A
Pregunta 9
Pregunta
Which of the below values shows the phase voltage for a star connected load
Image:
Slide1.JPG (image/JPG)
Respuesta
-
B
-
D
-
A
-
C
Pregunta 10
Pregunta
Which of the above values shows the phase current for a delta connected load
Image:
Slide2.JPG (image/JPG)
Respuesta
-
A
-
B
-
C
-
D
Pregunta 11
Pregunta
Why is it important to balance three phase loads as evenly as possible across the three phases
Respuesta
-
to reduce the neutral current
-
to improve the power factor
-
to reduce the voltage
-
to reduce disconnection times
Pregunta 12
Pregunta
Which of the following would not require a neutral connection
Respuesta
-
single phase load
-
three phase unbalanced loads
-
three phase balanced loads
-
T.T system
Pregunta 13
Pregunta
Which of the following values is the approximate neutral current for a balanced star connected load drawing 12 A per phase
Respuesta
-
20.78 A
-
36 A
-
0 A
-
12 A
Pregunta 14
Pregunta
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
Respuesta
-
75 A
-
110 A
-
43.3 A
-
130 A
Pregunta 15
Pregunta
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
Respuesta
-
155.9 A
-
90 A
-
51.96 A
-
30 A
Pregunta 16
Pregunta
Which of the above meters shows the line voltage for a star connected load
Image:
Slide1.JPG (image/JPG)
Respuesta
-
1
-
2
-
3
-
4
Pregunta 17
Pregunta
Which of the above meters shows the phase voltage for a star connected load
Image:
Slide1.JPG (image/JPG)
Respuesta
-
1
-
2
-
3
-
4
Pregunta 18
Pregunta
Which of the above meters shows the phase current for a star connected load
Image:
Slide1.JPG (image/JPG)
Respuesta
-
1
-
none of the above
-
2
-
3
Pregunta 19
Pregunta
What is the approximate value of line current for the delta system shown?
Image:
Slide2.JPG (image/JPG)
Respuesta
-
20A
-
6.7A
-
11.5A
-
34.6A
Pregunta 20
Pregunta
What is the approximate value of phase current for the delta system shown?
Image:
Slide4.JPG (image/JPG)
Respuesta
-
34.6A
-
6.7A
-
11.5A
-
20A
Pregunta 21
Pregunta
Which of the following is the phase voltage for the star system shown
Image:
Slide3.JPG (image/JPG)
Respuesta
-
60V
-
11.55V
-
34.64V
-
20V
Pregunta 22
Pregunta
What is the approximate value of phase voltage for the delta system shown
Image:
Slide4.JPG (image/JPG)
Respuesta
-
87V
-
230V
-
260V
-
150V
Pregunta 23
Pregunta
What is the approximate value of phase current for the delta system shown?
Image:
Slide5.JPG (image/JPG)
Respuesta
-
20A
-
6.71A
-
11.54A
-
34.6A
Pregunta 24
Pregunta
What formula would you use to calculate the Line voltage
Respuesta
-
VLINE = 230 + √3
-
VLINE = 230/√3
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VLINE = 230
-
VLINE = √3 x 230
Pregunta 25
Pregunta
Three phase Star connected system provided with a neutral can be used for
Respuesta
-
The connection of three phase loads
-
The connection of delta loads
-
The connection of an earth
-
The connection of single phase loads
Pregunta 26
Pregunta
In a star connected system what is the relationship between the line and phase current
Respuesta
-
I LINE = I PHASE /√3
-
V = I x R
-
I LINE = I PHASE x 1.732
-
I LINE = I PHASE
Pregunta 27
Pregunta
From the following diagram what number represents the Line Current
Image:
Slide6.JPG (image/JPG)
Respuesta
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1
-
2
-
3
-
4
Pregunta 28
Pregunta
From the following diagram if number 1 is 11kV what would the value number 3 be
Image:
Slide6.JPG (image/JPG)
Respuesta
-
19kV
-
6.35kA
-
6.35kV
-
11kV
Pregunta 29
Respuesta
-
Phase Voltage
-
Phase Current
-
Line Voltage
-
Line Current
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