Network Theorems

21. For a voltage source

1. terminal voltage is always lower than source e.m.f.
2. terminal voltage cannot be higher than source e.m.f.
3. the source e.m.f. and terminal voltage are equal
4. none of the above

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22. For high efficiency of transfer of power, internal resistance of the source should be

1. equal to the load resistance
2. less than the load resistance
3. more than the load resistance
4. none of the above

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23. For maximum transfer of power, internal resistance of the source should be

1. equal to load resistance
2. less than the load resistance
3. greater than the load resistance
4. none of the above

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24. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is

1. 10 Q
2. 20 Q
3. 30 Q
4. 40 Q

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25. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

1. a voltage source
2. a current source
3. both of above
4. none of the above

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26. In a series parallel circuit, any two resistances in the same current path must be in

1. series with each other
2. parallel with each other
3. series with the voltage source.'
4. parallel with the voltage source

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27. In Thevenin's theorem, to find Z

1. all independent current sources are short circuited and independent voltage sources are open circuited
2. all independent voltage sources are open circuited and all independent current sources are short circuited
3. all independent voltage and current sources are short circuited
4. all independent voltage sources are short circuited and all independent current sources are open circuited

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28. Kirchhoff s current law states that

1. net current flow at the junction is positive
2. Hebraic sum of the currents meeting at the junction is zero
3. no current can leave the junction without some current entering it.
4. total sum of currents meeting at the junction is zero

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29. Kirchhoff s law is applicable to

1. passive networks only
2. a.c. circuits only
3. d.c. circuits only
4. both a.c. as well d.c. circuits

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30. Kirchhoff s law is not applicable to circuits with

1. lumped parameters
2. passive elements
3. distributed parameters
4. non-linear resistances

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