Electrical Engineering - Three-Phase Systems in Power Applications

Exercise :: Three-Phase Systems in Power Applications - General Questions

6. 

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:

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7. 

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:

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8. 

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:

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9. 

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:

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10. 

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:

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