Circuits and Circuit Theory

11.At _________ frequencies the parallel R-L circuit behaves as purely resistive.

1. low
2. very low
3. high
4. very high

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12.At very low frequencies a series R-C circuit behaves as almost purely

1. resistive
2. inductive
3. capacitive
4. none of the above

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13.Capacitive reactance is more when

1. capacitance is less and frequency of supply is less
2. capacitance is less and frequency of supply is more
3. capacitance is more and frequency of supply is less
4. capacitance is more and frequency of supply is more

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14.Capacitive susceptance is a measure of

1. reactive power in a circuit
2. the extent of neutralisation of reactive power in a circuit
3. a purely capacitive circuit’s ability to pass current
4. a purely capacitive circuit’s ability to resist the flow of current

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15.Capacitors for power factor correction are rated in

1. kW
2. kVA
3. kV
4. kVAR

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16.For a frequency of 200 Hz, the time period will be

1. 0.05 s
2. 0.005 s
3. 0.0005 s
4. 0.5 s

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17.For a sine wave with peak value Emax _________ 8.30. the average value is

1. 0.636 Emax
2. 0.707 Emax
3. 0.434 EWc
4. lAUEmax

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18.For a sine wave with peak value Imax the r.m.s. value is

1. 0.5 Imax
2. 0.707
3. 0.9
4. 1.414 Lmax

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19.For the same peak value which of the following wave will ‘have the highest r.m.s. value?

1. square wave
2. half wave rectified sine wave
3. triangular wave
4. sine wave

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20.For the same peak value, which of the following wave has the least mean value?

1. half wave rectified sine wave
2. triangular wave
3. sine wave
4. square wave

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