Electrical Circuits

81. If one resistance in a series connection is open, then

1. The current is zero in all the other resistances
2. The current is maximum in all the other resistances
3. The voltage is zero across the open resistance
4. The voltage is infinite across the open resistance

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82. If resonant frequency is 10 kHz and quality factor is 50, then

1. Bandwidth is 200 Hz
2. XL = is 50,000 Ω
3. R is 50 Ω
4. XC = is 50,000 Ω

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83. If the capacitance of mica capacitor is 5 times the capacitance of air capacitor, then the relative permittivity of mica is

1. 2.5
2. 5
3. 10
4. 25

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84. If the inductance is decreased, the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source

1. Decreases
2. Increases
3. Decreases or increases
4. Decreases, increases or remains the same

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85. If the output resistance of a voltage source is 4 Ω , it internal resistance should be

1. 4 Ω
2. 8 Ω
3. 2 Ω
4. Infinite

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86. If three 100-pF capacitors are connected in series, then the total capacitance is

1. 300 pF
2. 100 pF
3. 50 pF
4. 33.3 pF

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87. If three 9 mH inductors are connected in parallel without mutual inductance then the total inductance is

1. 3 mH
2. 9 mH
3. 27 mH
4. 18 mH

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88. If two complex conjugates are added, __________ components results.

1. In-phase
2. Quadrature
3. Complex
4. Out-of-phase

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89. If two equal resistances connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be __________ that of series connection

1. One-half
2. One-fourth
3. Two times
4. Four times

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90. If two resistances of 9 Ω and 6 Ω are connected in parallel, the total resistance is

1. 54 Ω
2. 0.3 Ω
3. 15 Ω
4. 3.6 Ω

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