Objective Type Question or MCQ of B. Economics of Operation page-3

21.Self GMD method is used to evaluate

a) Inductance
b) Capacitance.
c) Inductance and capacitance both
d) None of the above

Ans: (a)

22. Most economic load an underground cable will be

a) Greater than its surge loading.
b) Less than the surge loading.
c) Equal to the surge loading.
d) None of the above is necessary.

Ans: (b)

23. Corona loss on a particular system at 50 Hz is 1 kW/phase per km. The corona loss on the same system with supply frequency 25 Hz will be

a) 1 kW/phase/km.
b) 0.5 kW/phase/km.
c) 0.667 kW/phase/km.
d) None of the above.

Ans: (c)

24. Effect of bonding the cable is

a) To increase the effective resistance and inductance.
b) To increase the effective resistance but reduce inductance.
c) To decreases the effective resistance and inductance.
d) To decrease the effective resistance but increases the inductance.

Ans: (b)

25. For effective application of counterpoise it should be buried into the ground to a depth of

a) 1 meter.
b) 2 meters.
c) Just enough to avoid theft.
d) None of the above.

Ans: (c)

26. Corona loss is less when the shape of the conductor is

a) Circular.
b) Flat.
c) Oval.
d) Independent of shape.

Ans: (a)

27. A system is said to be effectively grounded if its

a) Neutral is grounded directly.
b) Ratio of X₀/X₁ > 3.0.
c) Ratio of X₀/X₁ > 2.0.
d) Ratio of X₀/X₁ < 3.0.

Ans: (d)

28. Velocity of travelling wave through a cable of relative per mittivity 9 is

a) 9 × 10⁸ metres/sec.
b) 3 × 10⁸ metres/sec.
c) 10⁸ metres/sec.
d) 2 × 10⁸ metres/sec.

Ans: (c)

29. Voltage at the two ends of a line are 132 kV and its reactance is 40 ohms. The capacity of the line is

a) 435.6 MW.
b) 217.8 MW.
c) 251.5 MW.
d) 500 MW.

Ans: (a)

30. For a lumped inductive load, with increase in supply frequency

a) P and Q increases.
b) P increases, Q decreases.
c) P decreases, Q increases.
d) P and Q decreases.

Ans: (c)

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Multiple Choice Question (MCQ) of Electronics page-17:
241. Which of the following statement is true? a) The saturation voltage V_CF of silicon transistor is more than germanium transistor.
b) The saturation voltage V_CE for germanium transistor is more than silicon transistor.
c) The saturation voltage V_CE for silicon transistor is same as that for germanium.
d) The saturation voltage V_CE for silicon transistor is lower than germanium transistor.

Multiple Choice Question (MCQ) of Electronics page-16:
226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor.
b) Bound electrons are always present in the semiconductor.
c) Free electrons are always present in the semiconductor.
d) Inner and bound electrons are always present in the semiconductor.

Multiple Choice Question (MCQ) of Electronics page-15:
211. The materials whose electrical conductivity is usually less than 1 × 10⁶ mho/m are a) Semiconductors
b) Conductors
c) Insulators
d) Alloys

Multiple Choice Question (MCQ) of Electronics page-14:
196. In which of the following device the base resistors are not added in the package but added externally? a) UJT
b) CUJT
c) PUT
d) None of the above

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Objective Type Question or MCQ of B. Economics of Operation page-3

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