EE - Electrical Transient Analysis
Quiz by Florenzo Miguel Aclan (Florencii)
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30 questions
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- Q1An emf represented by the equation e=150sin314t + 50sin942t is applied to a capacitor having a capacitance 20 µF. What is the RMS value of the charging current?0.493 A1.349 A0.349 A0.943 A30s
- Q2A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. What is the time constant on this process in ms?106.9142.330s
- Q3A time of 10 milliseconds is required for the current on a series RL dc circuit to reach 90% of its final steady state value. Assume at t = 0, i(0) = 0. What is the time constant in seconds for the circuit?4.25 ms4.34 ms3.86 ms3.39 ms30s
- Q4The rate of rise of current through an inductive coil in maximumNear the final maximum steady state valueat the start of current flowAfter one time constantat 63.2% of its maximum steady state30s
- Q5A 6 H coil whose resistance is 12 ohms is connected in series with a 24 ohms resistor and to a 144 V battery and a switch. The switch is closed at t = 0. Determine the time constant and the steady state current of the circuit.0.36 sec, 12 A0.50 sec, 6 A0.17 sec, 4 A (note: in BEP 0.45 not 0.17)0.66 sec, 3 A30s
- Q6A coil of inductance 25 H with initial current of 1 ampere is suddenly connected to a source voltage of V=8.9+(3t)^1/2 volts. What is the current in the inductor after 5sec?4.525 A3.329 A4.429 A4.329 A30s
- Q7A 20 ohm resistance R and a 0.001 farad capacitance C are in series. A direct current voltage E of 100 volts is applied across the series circuit at t = 0 and the initial current i(0) = 5 A. Determine the resulting current i(t) at t = 0.01 second.3.03 A3.67 A2.78 A3.34 A30s
- Q8An uncharged capacitor in series with a 120-volt voltmeter of 10,000 ohms resistance is suddenly connected to a 100 V battery. One second later, the voltmeter reads 60 volts. Determine the rate at which the voltage across the capacitor is charging.51e^-0.51t51e^-0.55t55e^-0.51t55e^-0.55t30s
- Q9The current in a 125 farad capacitor is i=t(t+6.83)1/2 ampere. Find the voltage after 1 second if it is initially charged at 25 volts.19 volts25 volts11 volts26 volts30s
- Q10A 100 μF capacitor initially charged to 24 V is discharge across a series combination of a 1 kΩ resistor and a 200 μF capacitor. Find the current after 1 sec.8.84 nA7.24 nA8.43 nA7.34 nA30s
- Q11If a dc voltage is applied to an initially uncharged series RC circuit, the initial value of the current isinfinitezeroCVV/R30s
- Q12A coil having R = 2 Ω and L = 0.01 H carries a current given by i = 50 + 20 sin 300 t A movingiron ammeter, a moving-coil voltmeter and a dynameter wattmeter, are used to indicate current, voltage and power respectively. Determine the voltage reading of the instrument,135.2 V105.2 V112.2 V121.1 V30s
- Q13The transients current in a loss-free L-C circuit when excited from an ac source is a/an ______ sine wave.UnderdampedCritically DampedOverdampedUndamped30s
- Q14A series R-L-C circuit has R=10 ohms, L=1H, and C=0.0625 F. If the source voltage is 24V dc, then the circuit is _________.overdampedunderdampedcritically dampedundamped30s
- Q15A series RLC circuit consisting of 20 ohms resistor, 20 mH inductor, 100 uF capacitor in series is connected to a 100 V dc source. Find the additional resistance just to prevent oscillation of the resulting transient current.82.8 ohms8.28 ohms282 ohms28.2 ohms30s