# Objective Type Question or MCQ of B. Economics of Operation page-1

1.In order to have lower cost of electrical energy generation :

a) The load factor and diversity factor should be low.
b) The load factor should be low but diversity factor should be high.
c) The load factor should be low but diversity factor low.
d) The load factor and diversity factors should be high.

Ans: (d)

2. The cost of generation is theoretically minimum if :

a) The system constraints are considered.
b) The operational constraints are considered.
c) Both (a) and (b)
d) The constraints are not considered

Ans: (d)

3. If the loading of the line corresponds to the surge impedance the voltage at the receiving end is

a) Greater than sending end
b) Less than sending end
c) Equal to the sending end
d) None of the above is necessary.

Ans: (c)

4. If the penalty factor of a plant is unity, its incremental transmission loss is

a) 1.0
b) – 1.0
c) Zero
d) None of the above

Ans: (d)

5. If r is the radius of the conductor and R the radius of the sheath of the cable, the cable operates stably from the view point of dielectric strength if

a) r/R > 1.0
b) r/R < 1.0
c) r/R < 0.632
d) r/R > 0.368

Ans: (d)

6. The loss coefficients for a two-bus system are

a) B11= 0.02, B22 = 0.05, B12= 0.01, B21 = 0.015
b) B11= 0.02, B22 = 0.04, B12= -0.01, B21 = 0.01
c) B11= 0.03, B22 = 0.005, B12= 0.001, B21 = -0.001
d) B11= 0.03, B22 = 0.05, B12= 0.001, B21 = -0.001

Ans: (c)

7. Shunt compensation in a EHV line is resorted to

a) Improve the stability
b) Reduce the fault level
c) Improve the voltage profile.
d) None of the above

Ans: (c)

8. Most economic load on an overhead line is

a) Greater than natural load.
b) Less than the natural load.
c) Equal to the natural load.
d) None of the above is necessary.

Ans: (a)

9. If the penalty factor for bus 1 in a two-bus system is 1.25 and if the incremental cost of production at bus 1 is Rs. 200 per MWhr, the cost of received power at bus 2 is

a) Rs. 250/M Whr.
b) Rs. 62.5/MWhr.
c) Rs. 160/MWhr.
d) None of the above

Ans: (a)

10. The p.u. impedance value of an alternator corresponding to be base values 13.2 kV and 30 MVA is 0.2 p.u. The p.u. value for the base values 13.8 kV and 50 MVA will be

a) 0.306 p.u.
b) 0.33 p.u.
c) 0.318 p.u.
d) 0.328 p.u.

Ans: (a)

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