1. By which of the following methods the protection against direct lightning strokes and high voltage sweep waves is provided ?

Lightening arresters

Ground wire

Lightening arrestera and ground wires

Earthing of neutral

Answer: Lightening arrestera and ground wires

Explanation:


2. Poles which carry transformers are usually ?

circular

I-type

A-type

H-type

Answer: H-type

Explanation:


3. In a 70/6 AC. S.R. conductor there are ?

35 aluminium conductors and 3 steel conductors

70 aluminium conductors and 6 steel conductors

70 steel conductors and 6 aluminium conductors

none of the above

Answer: 70 aluminium conductors and 6 steel conductors

Explanation:


4. The material used for the manufacture of grounding wires is ?

cast iron

aluminium

stainless steel

galvanised steel

Answer: galvanised steel

Explanation:


5. The effective resistance of a conductor will be the same as 'ohmic resistance when ?

power factor is unity

current is uniformly distributed in the conductor cross-section

voltage is low

current is in true sine wave form

Answer: current is uniformly distributed in the conductor cross-section

Explanation:


6. Floating neutral, in 3-phase supply, is undesirable because it causes ?

low voltage across the load

high voltage across the load

unequal line voltages across the load

none of the above

Answer: unequal line voltages across the load

Explanation:


7. The surge resistance of cables is ?

20 ohms

50 ohms

200 ohms

300 ohms

Answer: 50 ohms

Explanation:


8. Resistance grounding is used for voltage between ?

3.3 kV to 11 kv

11 kV to 33 kV

33 kV to 66 kV

none of the above

Answer: 3.3 kV to 11 kv

Explanation:


9. A booser is connected in ?

parallel with earth connection

parallel with the feeder

series with the feeder

series with earth connection

Answer: series with the feeder

Explanation:


10. In the analysis of which of the following lines shunt capacitance is neglected ?

Short transmission lines

Medium transmission lines

Long transmission lines

Medium as well as long transmission lines

Answer: Short transmission lines

Explanation: