For effective use of a counterpoise wire

1.  Its leakage resistance should be greater than the surge impedance

2.  Its leakage resistance should be less than the surge impedance

3.  Its leakage resistance should be equal to the surge impedance

4.  Two resistance may have any relation

4

Its leakage resistance should be less than the surge impedance

Explanation :
No Explanation available for this question

A power station consists of two synchronous generators A and B of rating 250 MVA and 500 MVA with inertia 1.6 p.u and 1 p.u respectively. On their own base MVA ratings. The equivalent P.U inertia for the system on 100 MVA common base will be

1.  2.6

2.   0.615

3.    1.625

4.    9.0

4

9.0

Explanation :
No Explanation available for this question

An alternator having induced emf of 1.6 p.u is connected to an infinite bus of 1.0 p.u. If the bus has reactance of 0.2 p.u the maximum power that can be transferred is given by

1.  8 p.u

2.  2 p.u

3.  2.67 p.u

4.    5.0 p.u

4

2 p.u

Explanation :
No Explanation available for this question

The velocity of travelling wave through a cable at relative permittivity 9 is

1.  9X108 m/s

2.  3X108 m/s

3.  108 m/s

4.   2X108 m/s

4

108 m/s

Explanation :
No Explanation available for this question

A 66 KV system has string insulator having five discs and the earth to disc capacitance rato at 0.10. The string efficiency will be

1.  89%

2.  75%

3.  67%

4.   55%

4

67\%

Explanation :
No Explanation available for this question

A voltage of 100 KV is applied to an overhead line with its receiving end open. If the surge impedance of the line is 500 ohm, then the total surge power in the line is

1.  2000MW

2.  500 MW

3.  2 MW

4.  0.5 MW

4

2000MW

Explanation :
No Explanation available for this question

The main criterion for selection of the size of a distribution for a radial distribution system is

1.  Voltage drop

2.  corona loss

3.  temperature rise

4.  capital cost

4

Voltage drop

Explanation :
No Explanation available for this question

If an induction machine is run at above synchronous speed, it acts as

1.  A synchronous motor

2.  An inductor generator

3.  An inductor motor

4.  None of these

4

An inductor generator

Explanation :
No Explanation available for this question

The low voltage winding of a 400/230 V, 1-phase 50 Hz transformer is to be coneected to a 25 Hz, the supply voltage should be

1.  230 V

2.  460 V

3.   115V

4.  65V

4

115V

Explanation :
No Explanation available for this question

A voltage V= sin 314.15t is applied to a 1-phase transformer on no-load. If no-load current of the transformer is 2sin (314.16t-850), the magnetization branch impedance will be approximately equal to

1.  141900

2.    200 ?-850

3.  200 ?850

4.   282 ?-800

4