Electrical Circuits

31. A three-by-three, series-parallel matrix of resistors, all having the same ohmic value, would have a net resistance of

1. One-third the value of a single resistor
2. Three times the value of a single resistor
3. The same value as a single resistor
4. Nine times the value of a single resistor

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32. A trigger circuit consisting of a capacitor of 0.01 μF is connected in series with a resistor. If the circuit requires 100 Vdc to operate, determine the value of the resistor when time constant is 0.009s.

1. 900 Ω
2. 900 kΩ
3. 900 MΩ
4. 900 GΩ

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33. A trimmer is a variable capacitor in which capacitance is varied by changing the

1. Number of plates
2. Dielectric
3. Distance between plates
4. Plate area

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34. A wire of one kilometre length has a resistance of 20 Ω. If the length is halved, then the new resistance is __________ the original resistance.

1. Half
2. Twice
3. One-fourth
4. Three times

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35. According to Gauss theorem, flux can be equated to

1. Charge
2. Field intensity
3. Current
4. Voltage

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36. An ac series circuit is composed of a resistance of 20 Ω , inductive reactance of 40 Ω , and a capacitive reactance of 15 Ω . If a current of 1 ampere is flowing, what is the applied voltage

1. 320 V
2. 32 V
3. 220 V
4. 22 V

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37. An alloy composed of 84 % copper, 12 % manganese and 4 % nickel.

1. Manganin
2. Constantan
3. Nichrome
4. German silver wire

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38. An electric circuit contains

1. Passive elements
2. Active elements
3. Both active and passive elements
4. Reactive elements

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39. An impedance given by 90∠-45° is a/an impedance.

1. Inductive
2. Conductive
3. Resistive
4. Capacitive

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40. An inductance of 1 mH is

1. 0.001 H
2. 0.01 H
3. 0.0001 H
4. 0.10 H

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