Objective Type Question or MCQ of B. Economics of Operation page-2

11. For economic, the generator with highest positive incremental transmission loss will operate at

a) The lowest positive incremental cost of production.
b) The lowest negative incremental cost of production.
c) The highest positive incremental cost of production.
d) None of the above

Ans: (a)

12. Impulse ratio of a gap of given geometry and dimension is

a) Greater with solid than with air dielectric.
b) Greater with air than with solid dielectric.
c) Same for both solid and air dielectric.

Ans: (a)

13. The impulse ratio of a rod gap is

a) Unity.
b) Between 1.2 and 1.5.
c) Between 1.6 and 1.8.
d) Between 2 and 2.2.

Ans: (b)

14. Insulation of the modern EHV lines is designed based on

a) Lighting voltage
b) Switching voltage
c) Corona
d) RI

Ans: (b)

15. The incremental transmission loss of a plant is

a) Positive always.
b) Negative always.
c) Can be positive or negative.
d) None of the above.

Ans: (c)

16. Effect of increase in temperature in overhead transmission lines is to

a) Increases the stress and length
b) Decreases the stress but increases the length.
c) Decreases the stress and length.
d) None of the above.

Ans: (b)

17. Presence of earth in case of overhead lines

a) Increases the capacitance.
b) Increases the inductance.
c) Decreases the capacitance.
d) Decreases the increases.

Ans: (a)

18. Sending end voltage of a feeder with reactance 0.2 p.u. is 1.2 p.u. if the reactive power supplied at the receiving end of the feeder is 0.3 p.u., the approximate drop of volts in the feeder will be

a) 0.2 p.u.
b) 0.06 p.u.
c) 0.05 p.u.
d) 0.072 p.u.

Ans: (c)

19. Capacitance and inductance per unit length of a line operating at 110 kV are 0.01 mF and 2 mH. The surge impedance loading of the line will be

a) 40 MVA
b) 30 MVA
c) 27 MVA
d) None of the above

Ans: (c)

20. Surge impedance of 50 miles long underground cable is 50 ohms. For a 25 miles length it will be

a) 25 ohms
b) 50 ohms
c) 100 ohms
d) None of the above

Ans: (b)

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Objective Type Question or MCQ of B. Economics of Operation page-2

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