A certain oscilloscope with 4 c.m by 4 c.m screen has its own sweep output fed to its input. If the x and y sensitivities are same, the oscilloscope will display a

1.  Triangular wave

2.  Diagonal line

3.  Sine wave

4.  Circle

4

Diagonal line

Explanation :
No Explanation available for this question

Instrument transformers are known to introduce magnitude and phase errors in measurements. These are primarily due to

1.  Improper connections on the primary side

2.  Measurement errors inherent in the meter connected to the transfer secondary

3.  Open and short circuit parameters of the instrument transformers

4.  none

4

Open and short circuit parameters of the instrument transformers

Explanation :
No Explanation available for this question

The inductance of a power transmission line increases with

1.  Decrease in line length

2.  Increase in diameter of conductor

3.  Increase in spacing between the phase conductors

4.  Increase in load current carried by the conductors

4

Increase in spacing between the phase conductors

Explanation :
No Explanation available for this question

A three phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d’. If now the conductors of the line are rearranged to form an equlilateral triangle of sides equal to ‘d’ then

1.  Average capacitance and inductance will increase

2.  Average capacitance will increase and inductance will increase

3.  Average capacitance will increase and inductance will decrease

4

Average capacitance will increase and inductance will decrease

Explanation :
No Explanation available for this question

The insulation level of a 400 KV EHV over head transmission line is decided on the basis of

1.  Lighning over voltage

2.  Switching over voltage

3.  Corona inception voltage

4

Switching over voltage

Explanation :
No Explanation available for this question

Consider a long, two-wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and the distance between their centers is 1 m. If this distance is doubled, then the inductance per unit length

1.  Doubles

2.  Halves

3.  Increases but does not double

4.  Decreases but does not halve

4

Increases but does not double

Explanation :
No Explanation available for this question

A long wire composed of a smooth round conductor runs above parallel to the ground (Assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

1.  The upper surface of the conductor

2.  The lower surface of the conductor

3.  The ground surface

4.  Midway between the conductor and the ground

4

The lower surface of the conductor

Explanation :
No Explanation available for this question

Bundled conductors are mainly used in high voltage overhead transmission lines to

1.  Reduce transmission line losses

2.  Increase mechanical strength of the line

3.  Reduce corona

4.  Reduce sag

4

Reduce corona

Explanation :
No Explanation available for this question

The rated voltage of a 3-phase power system is given as

1.  RMS phase voltage

2.  PEAK phase voltage

3.  RMS line to line voltage

4.  PEAK line to line voltage

4

RMS line to line voltage

Explanation :
No Explanation available for this question

The charging current of a 400 kV transmission line is more than that of a 220kV line of the same length

1.  True

2.  False

3.  Data insufficient

4.  None of these

4