Three-Phase Systems in Power Applications - General Questions (2)

Directions to Solve

Three-Phase Systems in Power Applications - General Questions

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 V_RMS, what is the magnitude of each line voltage?

A.	0 V
B.	90 V
C.	156 V
D.	180 V

Answer: Option C

Explanation:

No answer description available for this question.

10.

Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 .

A.	single-phase 32 A; three-phase 16 A
B.	single-phase 16 A; three-phase 8 A
C.	single-phase 8 A; three-phase 4 A
D.	single-phase 16 A; three-phase 0 A

Answer: Option B

Explanation:

No answer description available for this question.

11.

A three-phase generator is connected to three 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

A.	0 A
B.	1.33 A
C.	3.99 A
D.	2.66 A

Answer: Option A

Explanation:

No answer description available for this question.

12.

A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is

A.	13.3 mA
B.	133 mA
C.	1.33 A
D.	6.2 A

Answer: Option C

Explanation:

No answer description available for this question.

13.

A two-phase generator is connected to two 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

A.	1.33 A
B.	1.88 A
C.	2.66 A
D.	1.77 A

Answer: Option D

Explanation:

No answer description available for this question.

14.

A constant load power means a uniform conversion of

A.	mechanical to electrical energy
B.	electrical to mechanical energy
C.	current to voltage
D.	voltage to current

Answer: Option B

Explanation:

No answer description available for this question.

15.

In a Y-connected circuit, the magnitude of each line current is

A.	one-third the phase current
B.	three times the corresponding phase current
C.	equal to the corresponding phase current
D.	zero

Answer: Option C

Explanation:

No answer description available for this question.

16.

In a Y-Y source/load configuration, the

A.	phase current, the line current, and the load current are all equal in each phase
B.	phase current, the line current, and the load current are 120° out of phase
C.	phase current and the line current are in phase, and both are 120° out of phase with the load current
D.	line current and the load current are in phase, and both are out of phase with the phase current

Answer: Option A

Explanation:

No answer description available for this question.

Three-Phase Systems in Power Applications - General Questions (2)

Three-Phase Systems in Power Applications - General Questions

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