Electrical Engineering MCQs on Power System Protection
Contents
- 1 If fault occurs near the impedance relay, the VII ratio will be
- 2 When a transmission line is energized, the wave that propagates on it is
- 3 The reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load
- 4 A thermal protection switch can protect against
- 5 As compared to a rewireable fuse, the HRC fuse has
If fault occurs near the impedance relay, the VII ratio will be
If fault occurs near the impedance relay, the VII ratio will be
- Constant for all distances
- Higher than that of if fault occurs away from the relay
- Lower than that of if fault occurs away from the relay
- None of these
Correct answer: 3. Lower than that of if fault occurs away from the relay
When a transmission line is energized, the wave that propagates on it is
When a transmission line is energized, the wave that propagates on it is
- Current wave only
- Voltage wave only
- Both of above
- Power factor wave only
Correct answer: 3. Both of above
The reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load
The reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load
- Infinity
- Unity
- Zero
- None of these
Correct answer: 3. Zero
A thermal protection switch can protect against
A thermal protection switch can protect against
- Over voltage
- Overload
- Short-circuit
- Temperature
Correct answer: 2. Overload
As compared to a rewireable fuse, the HRC fuse has
As compared to a rewireable fuse, the HRC fuse has
- High rupturing capacity
- High speed of operation
- No ageing effect
- All of these
Correct answer: 4. All of these