# Bulk power transmission over long HVDC lines are preferred, on account of

1.  Low cost of HVDC terminals

2.  No harmonic problems

3.  Minimum line power losses

4.  Simple protection

4

No harmonic problems

Explanation :
No Explanation available for this question

# The main consideration for higher and higher operating voltage of transmission is to

1.  Increase efficiency of transmission

2.  Reduce power losses

3.  Increase power transfer capability

4.  Both a and b

4

Increase power transfer capability

Explanation :
No Explanation available for this question

# In a high voltage dc transmission scheme, reactive power is needed both for rectifier at the sending end and, for inverter at the receiving end. During the operation of such a dc link, rectifier receives

1.  Lagging reactive power and the inverter supplies leading reactive power

2.  Leading reactive power and the inverter supplies lagging reactive power

3.  Lagging reactive power and the inverter supplies lagging reactive power

4

Lagging reactive power and the inverter supplies leading reactive power

Explanation :
No Explanation available for this question

# Transmission line has a total series reactance of 0.2 p.u. Reactive power compensation is applied at the midpoint of the line and it is controlled such that midpoint voltage of the transmission line is always maintained at 0.98 p.u. If voltages at both ends of the line are maintained at 1.0 p.u, then steady state power transfer limit of the transmission line is

1.  9.8 p.u

2.  4.9 p.u

3.  19.6 p.u

4.  5 p.u

4

5 p.u

Explanation :
No Explanation available for this question

# A 3- phase transformer has rating of 20 MVA 220 KV(star) +33 KV 9delta) with leakage reactance of 12 %. The transformer reactance (in ohms) referred to each phase of the LV delta connected side is

1.  23.5

2.  19.6

3.   18.5

4.   8.7

4

19.6

Explanation :
No Explanation available for this question

# If a 75 MVA , 10 KV synchronous generator hasXd=0.4p.u, then Xd value (in p.u) to a base of 100 MVA, 11 KV is

1.  5.78

2.  0.279

3.  0.412

4.   0.44

4

0.44

Explanation :
No Explanation available for this question

# The inertia constant H of a machine of 200 MVA is 2 p.u. Its value corresponding to 400 MVA will

1.  4.0

2.  2.0

3.  1.0

4.   0.5

4

1.0

Explanation :
No Explanation available for this question

# A 3 phase induction motor takes 100 KW at 415 V, 50 Hz and a power factor of 08 lagging. What is the KVAR rating of a capacitor bank to improve the power factor to 0.9 lagging, if the capacitor bank is connected to delta

1.  6.25

2.  7.99

3.  7.91

4.  8.82

4

8.82

Explanation :
No Explanation available for this question

# A 3-pahse induction motor takes 120 KW at 415 V, 50 Hz and a power factor of 08 lagging. What is the capacitance per phase, if its power factor is improve to 0.9 and capacitor bank is connected in star

1.  587µF

2.   440 µF

3.  560 µF

4.    600 µF

4

587µF

Explanation :
No Explanation available for this question

1.  33.5 amps

2.  32.0 amps

3.  30 amps

4.  41 amps

4