Power System MCQ Part 3
Contents
- 1 When all three phases are short circuited, electric current through system is
- 2 The operator a rotates vector in anticlockwise direction by degrees of
- 3 If Z1 and Z2 are positive and negative sequence impedances in a synchronous generator, then which of the following statements is correct
- 4 Current limiting reactors in electric power system have
- 5 Zero sequence component in 3 phase voltage of delta connection is
When all three phases are short circuited, electric current through system is
When all three phases are short-circuited, the electric current through the system is:
- Zero
- Low but not zero
- Very high
- None of these
Correct answer: 3. Very high
The operator a rotates vector in anticlockwise direction by degrees of
The operator a rotates vector in anticlockwise direction by degrees of:
- 60°
- 90°
- 120°
- 180°
Correct answer: 3. 120°
If Z1 and Z2 are positive and negative sequence impedances in a synchronous generator, then which of the following statements is correct
If Z1 and Z2 are positive and negative sequence impedances in a synchronous generator, then which of the following statements is correct:
- Z1 < Z2
- Z1 > Z2
- Z1 = Z2
- Z1 < 10Z2
Correct answer: 2. Z1 > Z2
Current limiting reactors in electric power system have
Current limiting reactors in electric power system have:
- Large reactance and large resistance
- Large resistance and low reactance
- Large reactance and low resistance
- None of these
Correct answer: 3. Large reactance and low resistance
Zero sequence component in 3 phase voltage of delta connection is
Zero sequence component in 3 phase voltage of delta connection is:
- Zero
- Line voltage
- Line voltage/√3
- √3 * Line voltage
Correct answer: 1. Zero