Practice Test: Question Set - 05
1. Which of the following is the least expensive protection for over-current is low voltage system?
- (A) Rewirable fuse
- (B) Isolator
- (C) Oil circuit breaker
- (D) Air break circuit breaker
2. The interaction between a transmission line and communication line is minimized by
- (A) Transposing transmission as well as
communication lines
- (B) Increasing the height of the transmission line
tower
- (C) Increasing the distance between the two
lines
- (D) All of the above
3. To reduce short circuit fault currents are used.
- (A) Reactors
- (B) Resistors
- (C) Capacitors
- (D) None of the above
4. The under voltage relay can be used for
- (A) Generators
- (B) Bus-bars
- (C) Transformers
- (D) All of the above
5. Over-fluxing protection is recommended for
- (A) Distribution transformer
- (B) Generator transformer of the power plant
- (C) Autotransformer of the power plant
- (D) Station transformer of the power plant
6. The fuse rating is expressed in terms of
- (A) Current
- (B) Voltage
- (C) VAR
- (D) kVA
7. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated?
- (A) Radiation
- (B) Convection
- (C) Conduction
- (D) All of the above
8. SF6 gas
- (A) Is yellow in color
- (B) Is lighter than air
- (C) Is nontoxic
- (D) Has pungent small
9. Thermal overload relays are used to protect the motor against over current due to
- (A) Short-circuits
- (B) Heavy loads
- (C) Grounds
- (D) All of the above
10. Large internal faults are protected by
- (A) Merz-price percentage differential
protection
- (B) Mho and ohm relays
- (C) Horn gaps and temperature relays
- (D) Earth fault and positive sequence relays
0 blogger:
Post a Comment