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EE - Electrical Transient Analysis

Quiz by Florenzo Miguel Aclan (Florencii)

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30 questions
Show answers
  • Q1
    An 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 A
    1.349 A
    0.349 A
    0.943 A
    30s
  • Q2
    A 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?
    10
    6.9
    14
    2.3
    30s
  • Q3
    A 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 ms
    4.34 ms
    3.86 ms
    3.39 ms
    30s
  • Q4
    The rate of rise of current through an inductive coil in maximum
    Near the final maximum steady state value
    at the start of current flow
    After one time constant
    at 63.2% of its maximum steady state
    30s
  • Q5
    A 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 A
    0.50 sec, 6 A
    0.17 sec, 4 A (note: in BEP 0.45 not 0.17)
    0.66 sec, 3 A
    30s
  • Q6
    A 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 A
    3.329 A
    4.429 A
    4.329 A
    30s
  • Q7
    A 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 A
    3.67 A
    2.78 A
    3.34 A
    30s
  • Q8
    An 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^-0.51t
    51e^-0.55t
    55e^-0.51t
    55e^-0.55t
    30s
  • Q9
    The 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 volts
    25 volts
    11 volts
    26 volts
    30s
  • Q10
    A 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 nA
    7.24 nA
    8.43 nA
    7.34 nA
    30s
  • Q11
    If a dc voltage is applied to an initially uncharged series RC circuit, the initial value of the current is
    infinite
    zero
    CV
    V/R
    30s
  • Q12
    A 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 V
    105.2 V
    112.2 V
    121.1 V
    30s
  • Q13
    The transients current in a loss-free L-C circuit when excited from an ac source is a/an ______ sine wave.
    Underdamped
    Critically Damped
    Overdamped
    Undamped
    30s
  • Q14
    A 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 _________.
    overdamped
    underdamped
    critically damped
    undamped
    30s
  • Q15
    A 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 ohms
    8.28 ohms
    282 ohms
    28.2 ohms
    30s

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