Circuits and Circuit Theory

91.The safest value of current the human body can carry for more than 3 second is

1. 4 mA
2. 9 mA
3. 15 mA
4. 25 mA

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92.The series and parallel resonance on L-C circuit’ differs in that

1. series resistance needs a low-resistance source for sharp rise in current
2. series resonance needs a high-resistance source for sharp increase in current
3. parallel resonance needs a low-resistance source for a sharp in¬crease in impedance
4. parallel resonance needs a low-resistance source for a sharp rise in line current

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93.The square waveform of current has following relation between r.m.s. value and average value.

1. r.m.s. value is equal to average value
2. r.m.s. value of current is greater than average value
3. r.m.s. value of current is less than average value
4. none of the above

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94.The time constant of a series R-C circuit is given by

1. R/C
2. RC2
3. RC
4. R2C

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95.The time constant of the capacitance circuit is defined as the time during which voltage

1. falls to 36.8% of its final steady value
2. rises to 38.6% of its final steady value
3. rises to 63.2% of its final steady value
4. none of the above

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96.The transient currents are associated with the

1. changes in the stored energy in the inductors and capacitors
2. impedance of the circuit
3. applied voltage to the circuit
4. resistance of the circuit

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97.The voltage of domestic supply is 220V. This figure represents

1. mean value
2. r.m.s. value
3. peak value
4. average value

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98.Time constant of a capacitive circuit

1. increases with the decrease of capacitance and decrease of resistance
2. increases with the decrease of capacitance and increase of resistance
3. increases with the increase of capacitance and decrease of resistance
4. increase with increase of capacitance and increase of resistance

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99.Time constant of a circuit is the time in seconds taken after the application of voltage to each

1. 25% of maximum value
2. 50% of maximum value
3. 63% of maximum value
4. 90% of the maximum value

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100.Time constant of an inductive circuit

1. increases with increase of inductance and decrease of resistance
2. increases with the increase of inductance and the increase of resistance
3. increases with decrease of inductance and decrease of resistance
4. increases with decrease of inductance and increase of resistance

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