# A 220 kV, 20 km long, 3-phase transmission line has the following A, B, C, D constants : A = D = 0.96/3°, B = 55?65°Ω/ phase, C = 0.05 D = 04?80° S/phase. Its charging current per phase will be

1.  11/√3A

2.  11 A

3.  220 A

4.   220/√3A

4

11/√3A

Explanation :
No Explanation available for this question

# A single phase transmission line of impedance j 0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is

1.  unity

2.  0.8 laggin

4.  0.6 lagging

4

0.6 lagging

Explanation :
No Explanation available for this question

# Consider a unity- feedback control system with open-loop transfer function G (s) =  K /s (s + 1) The .steady state error of the system due to a unit step input is

1.  zero

2.  K

3.  1/K

4.  ∞

4

zero

Explanation :
No Explanation available for this question

# A medium line with parameters A, B, C, D is extended  by connecting a short line of impedance  Z in series The overall ABCD parameters of the series combination will be

1.  A, AZ, C + D/Z, D

2.  A, AZ + B, C, CZ + D

3.  A + BZ, B, C + DZ, D

4.   AZ, B, C/Z, D

4

A, AZ + B, C, CZ + D

Explanation :
No Explanation available for this question

# The feedback control system shown in the given figure represents, a

1.  Type 0 system

2.  Type 1 system

3.  Type 2 system

4.  Type 3 system

4

Type 3 system

Explanation :
No Explanation available for this question

# When bundle conductors are used in place of sing conductors, the effective inductance an capacitance will respectively

1.  increase and decrease

2.  decrease and increase

3.  decrease and remain Unaffected

4.  remain unaffected and increase

4

decrease and increase

Explanation :
No Explanation available for this question

# To increase the visual critical voltage of cporona for an overhead line, one solid phase-conductor is replaced by a "bundle" of four smaller conductor per phase, having an aggregate cross-sectional area equal to that Of the solid conductor. If the radius of the solid conductor is 40 mm, then the radius of each of the bundle Conductors would be

1.  10 mm

2.  20 mm

3.  28.2 mm

4.  30 mm

4

20 mm

Explanation :
No Explanation available for this question

# A unity feedback control system  has a forward path transfer function equal to 42.25/s2(s+6.5) The unit step response of this system starting from rest, will have its maximum value at a time equal to

1.  0 sec

2.  0.56sec

3.  5.6 sec

4.  infinity

4

infinity

Explanation :
No Explanation available for this question

# For an existing ac transmission line, the string efficiency is 80%, if de voltage is supplied for the same set up, the string efficiency will be

1.  < 80%

2.  80%

3.  90%

4.   100%

4

100\%

Explanation :
No Explanation available for this question

1.  20 sec

2.  40 sec

3.  35 sec

4.  45 sec

4