Substation Objective Questions Answers

1. Which is the first equipment seen in the substation while coming from transmission system:
a) Circuit breaker
b) Lightning arrester
c) Current transformer
d) Transformer

B

2. Gas Insulated Substation is employed where:
a) Where there is less space available
b) For high altitude substations
c) In terrain region
d) All the above

A

3. A bus coupler circuit breaker is utilized in a substation for:
a) Joining the transmission line with station bus-bar
b) Joining main and transfer bus in a substation
c) Joining the generator with transfer
d) Joining the neutral of the generator with earth

B

4. Which of the gas is used in gas insulated substation:
a) Nitrogen + SF6
b) Hydrogen + SF6
c) SF6
d) None of the above

C

5. Which of the following bus-bars arrangement is more reliable and flexible:
a) Main and transfer bus scheme
b) One-and-half breaker scheme
c) Double main busbar scheme
d) Single busbar scheme

B

6. What is the maximum  transmission voltage substation in India:
a) 400 kV
b) 500 kV
c) 750 kV
d) 1000 kV

C

7. A busbar is rated by:
a) Current only
b) Voltage only
c) Current, voltage and frequency
d) Current, voltage, frequency and short circuit current

D

8. In a substation current transformers are used to:
a) Measuring purpose
b) Protection purpose connecting to relays
c) Both (a) and (b)
d) None of the above

C

9. Step potential and Touch potential is associated with:
a) High voltage transmission
b) Earthing of the substation
c) Voltage rise in the substation
d) Communication systems

B

10. It is the minimum clearance required between the live conductors and maintenance operators limit:
a) Ground clearance
b) Phase cearance
c) Sectional clearance
d) None of the above

C