Power System Protection MCQ Part 7
Mho relay is
Mho relay is:
- Voltage restrained overcurrent relay
- Voltage restrained directional relay
- Directional restrained overvoltage relay
- Directional restrained overcurrent relay
Correct answer: 2. Voltage restrained directional relay
At the instant of contact separation in circuit breaker the current which exists is given the name
At the instant of contact separation in circuit breaker the current which exists is given the name:
- Breaking current
- Arc
- Recovery
- Restriking
Correct answer: 1. Breaking current
The fluids used in circuit breaker should be
The fluids used in circuit breaker should be:
- Non-inflammable
- High dielectric strength
- Arc extinguishing
- All of these
Correct answer: 4. All of these
Generally it is preferable to use which reactance for short circuit calculations
Generally, it is preferable to use which reactance for short circuit calculations:
- Ohmic reactance
- Percentage reactance
Correct answer: 2. Percentage reactance
Which of following is correct about the occurrence of an unsymmetrical faul
Which of following is correct about the occurrence of an unsymmetrical fault:
- The positive sequence component is always less than that of negative sequence component
- The positive sequence component is always more than that of negative sequence component
- The positive sequence component is always equal to negative sequence component
- Any of above is possible
Correct answer: 2. The positive sequence component is always more than that of negative sequence component