The voltages, VBR ,Vph are related in star connected system is?

The relation between VRY, Vph in a star connected system is?

A

VRY = Vph

B

VRY = √3Vph

C

VRY = 3√3Vph

D

VRY = 3Vph

In a star connected system, the relation between VYB, Vph is?

A

VYB = Vph

B

VYB = 3√3Vph

C

VYB = 3Vph

D

VYB = √3Vph

A symmetrical star connected system has VRN = 230∠0⁰. The phase sequence is RYB. Find VBR.

A

398.37∠210⁰

B

398.37∠-210⁰

C

398.37∠120⁰

D

398.37∠-120⁰

In a delta connected system, the voltage across the terminals R and Y is 400∠0⁰. Find the line voltage VBR.

A

400∠240⁰

B

400∠120⁰

C

400∠-240⁰

D

400∠-120⁰

In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

A

2,000 V

B

6,000 V

C

666 V

D

3,464 V

In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VBR is?

A

V∠120⁰

B

V∠240⁰

C

V∠-240⁰

D

V∠-120⁰

What are the phase voltages when T6, T1 and T2 are conducting? Consider a star connected R load.

A

VYN = VBN = Vs/3, VRN = 0

B

VYN = VRN = – Vs/3, VBN = 2Vs/3

C

VRN = VBN = – Vs/3, VYN = 2Vs/3

D

VYN = VBN = – Vs/3, VRN = 2Vs/3

What are the phase voltages when T1, T2 and T3 are conducting? Consider a star connected R load.

A

VYN = VBN = VRN = 0

B

VYN = VRN = Vs/3, VBN = – 2Vs/3

C

VRN = VBN = – Vs/3, VYN = 2Vs/3

D

VYN = VBN = Vs/3, VRN = – 2Vs/3

If the resistors of star connected system are R1, R2, R3 then the resistance between 1 and 2 in delta connected system will be?

A

(R1R2 + R2R3 + R3R1)/R3

B

(R1R2 + R2R3 + R3R1)/R1

C

(R1R2 + R2R3 + R3R1)/R2

D

(R1R2 + R2R3 + R3R1)/(R1+R2)

If the resistors of star connected system are R1, R2, R3 then the resistance between 2 and 3 in delta connected system will be?

A

(R1R2 + R2R3 + R3R1)/R3

B

(R1R2 + R2R3 + R3R1)/R2

C

(R1R2 + R2R3 + R3R1)/R1

D

(R1R2 + R2R3 + R3R1)/(R3+R2)

The voltages, VBR ,Vph are related in star connected system is?

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