Electrical Objective Questions:Transmission and Distribution (Set 5)

Electrical Interview Questions With Answers:

1) Electrical Corona is a Phenomenon in which:

a) Partial Breakdown of Air takes place between the conductors

b) Complete Breakdown of Air takes place between the conductors

c) Sparking between the light

d) Large noise produced

2) Corona is accompanied by following events:

a) Violet visible discharge in the darkness

b) Hissing sound

c) Vibration

d) Power Loss

e) Radio Interference

f) Ozone gas production

g) All the above

3) The current drawing by the lines during the affect of corona loss is:

a) Non Sinusoidal

b) Sinusoidal

c) Square

d) DC

4) Corona is likely to occur maximum in the case of:

a) High Voltage Transmission lines

b) Distribution lines

c) Earth conductors which are not connected to earth

d) Domestic Wiring

5) Corona has the disadvantage of:

a) Power loss in transmission system

b) Interferences with neighboring communication lines

c) Introducing harmonics in to the transmission lines

d) All the above

6) The advantage of corona is that:

a) Improves Voltage regulation

b) Works as safety valves for surges

c) Improves Power Factor in the system

d) No advantage

7) Corona losses are minimised when:

a) Conductor size is reduced

b) providing sharp points in the transmission network

c) Current density in the conductor is reduced

d) Smooth conductors are used

8) The dielectric strength of air under normal condition is:

a) 30 kV/cm

b) 100 kV/cm

c) 150 kV/cm

d) 200 kV/cm

Answers:

(1) b (2) g (3) a (4) a

(5) d (6) b (7) d (8) a