Network Theorems

11. A passive network is one which contains

1. only variable resistances
2. only some sources of e.m.f. in it
3. only two sources of e.m.f. in it
4. no source of e.m.f. in it

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12. A star circuit has element of resistance R/2. The equivalent delta elements will be

1. R/6
2. fi?
3. 2R
4. 4R

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13. A terminal where three on more branches meet is known as

1. node
2. terminus
3. combination
4. anode

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14. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always

1. negative
2. positive
3. determined by battery e.m.fs.
4. zero

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15. An ideal voltage source has

1. zero internal resistance
2. open circuit voltage equal to the voltage on full load
3. terminal voltage in proportion to current
4. terminal voltage in proportion to load

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16. An ideal voltage source should have

1. large value of e.m.f.
2. small value of e.m.f.
3. zero source resistance
4. infinite source resistance

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17. Application of Norton's theorem to a circuit yields

1. equivalent current source and impedance in series
2. equivalent current source and impedance in parallel
3. equivalent impedance
4. equivalent current source

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18. Between the branch voltages of a loop the Kirchhoff s voltage law imposes

1. non-linear constraints
2. linear constraints
3. no constraints
4. none of the above

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19. Choose the incorrect statement.

1. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.
2. A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.
3. A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.
4. A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

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20. Efficiency of power transfer when maximum transfer of power c xerosis (a) 100%

1. 80%
2. 75%
3. 50%
4. none of the above

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