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EE - DC Circuits

Quiz by Florenzo Miguel Aclan (Florencii)

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30 questions
Show answers
  • Q1
    A certain copper wire has a resistance of 25 ohms at 10°𝐶. Take the temperature coefficient at 10°𝐶 to be 𝛼 = 0.00405 °𝐶⁻¹. What must be the maximum operating temperature of the wire if its resistance is to be increase by at most 20%?
    60.13 °C
    59.24 °C
    58.80 °C
    59.38 °C
    30s
  • Q2
    A cylindrical copper rod has resistance R. It is reinforced to twice its original length with NO change of volume. What is the new resistance?
    4 R
    8 R
    2 R
    6 R
    30s
  • Q3
    For any circuit the number of independent equations containing unit’s, resistance, and current, equal the number of
    Branches minus 1
    Branches
    Junction minus 1
    Junctions
    30s
  • Q4
    Four wires meet at a junction. The first carries 4 A into the junction, the second carries 5 A out of the junction and the third carries 2 A out of the junction. The fourth carries ______ the junction.
    7 A into
    3 A into
    3 A out
    7 A out
    30s
  • Q5
    In the context of the loops and junctions’ rules for electrical circuits a junction is where ______.
    Three or more wires are joined
    A wire is connected to a resistor
    A wire is connected to a battery
    Only two wires are joined
    30s
  • Q6
    If the potential difference across a resistor is doubled only _____________.
    The current is doubled
    The resistance is doubled
    The current is halved
    The resistance is halved
    30s
  • Q7
    Nine identical wires, each of diameter d and length L, are connected in PARALLEL. The combination has the same resistance as a SINGLE similar wire of depth L but whose diameter is ______.
    9d
    d/3
    d/9
    3d
    30s
  • Q8
    A certain voltmeter has an internal resistance of 10 kΩ and a range from 0 to 12 V. To extend its range to 120 V, use a series resistance of _________ Ω.
    100,000
    80,000
    90,000
    120,000
    30s
  • Q9
    A 15 Ω resistor is connected in parallel with a series combination of resistor of 8 and 12 Ω. If the voltage drop across the 8 Ω resistor is 48 V, what is the total voltage applied?
    130 V
    110 V
    120 V
    140 V
    30s
  • Q10
    Which of the following will you connect to make a galvanometer into ammeter?
    A low resistance in series
    A high resistance in parallel
    A high resistance in series
    A low resistance in parallel
    30s
  • Q11
    Resistor 1 has twice the resistance of resistor 2. They are connected in parallel to a battery. Find the ratio of thermal energy generation rate in resistor 1 to that in resistor 2?
    2:1
    4:1
    1:2
    1:4
    30s
  • Q12
    The substation bus bar is made up of 2 inches round copper bars 20 ft long. What is the resistance of each bar if resistivity is 1.724 x 10⁻⁶ ohm-cm.
    5.185 x 10⁻⁵ Ω
    13.8 x 10⁻⁵ Ω
    7.21 x 10⁻⁵ Ω
    2.96 x 10⁻⁵ Ω
    30s
  • Q13
    A resistor with resistance R1 and a resistor with resistance R2 are connected in parallel to an ideal battery with emf V. What is the rate of thermal energy generation in the resistor with resistance R1?
    V2/(R1+R2)
    V2/R2
    V2R1/(R1+R2)2
    V2/R1
    30s
  • Q14
    Current has units of __________.
    coulomb
    coulomb/second
    ohm
    volt
    30s
  • Q15
    A stationary conducting loop with an internal resistance of 0.50 ohm is placed in a time-varying magnetic field. When the loop is closed, a current of 5 A flows through it. What will the current be if the loop is opened to create s small gap and a 2-ohm resistor is connected across its open ends?
    3 A
    1 A
    4 A
    2 A
    30s

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