EE8017 HVDC IAT-3

Magnetic effect of current is called

• magnetism

• steady current

• electric current

• electromagnetism

To control a large current with the help of a small current, we use the

• relay

• fuse

• breaker

• transformer

At city substation, the AC is stepped down to

• 130 V

• 120 V

• 320 V

• 220 V

An electrical switch that opens and closes under the control of another electrical circuit is called

• fuse

• relay

• breaker

• transformer

A power station generates 600 MW of electrical power which is fed to a transmission line. If the input voltage is 300 Kv, then what current would flow in the transmission line?

• 5 × 103 A

• 10 × 103 A

• 2 × 103 A

• 7 × 103 A

HVDC transmission is preferred to EHV __ AC because

• HVDC terminal equipment are inexpensive

• VAR compensation is not required in HVDC systems

• System stability can be improved

• Harmonics __ problem is avoided

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

• low cost of HVDC treminals

• no harmonic problems

• minimum line power losses

• simple protection

Out of the considerations (i) to (iv) listed below,

(i) No distance limitation related to steady state stability

(ii) No reactive power requirement from the system at the two terminals

(iii) No substantial effect on fault level of the two systems at the terminals inspite of the inter connection

(iv) no corona problems

The considerations which constitute advantages of HVDC transmission are

• ALL OF THE ABOVE

• (i) and (ii)

• (ii) and (iii)

• (iii) and (iv)

Choose two appropriate auxiliary components of a HVDC transmission system from the following

• D.C. line inductor and reactive power sources

• Distance relays on D.C. line

• A.C. line inductor

• Series capacitance of A.C. line

The HVDC converter

• Does not consume reactive power

• Consumes as much reactive power as real power

• Consumes 50% of the real power

• Consumes 50% of the reactive power