Electronic Principles Basic Questions & Answers - Set 14 - ObjectiveBooks

Electronic Principles Basic Questions & Answers - Set 14

Practice Test: Question Set - 14


1. The valence electron of a copper atom experiences what kind of attraction toward the nucleus?
    (A) Strong
    (B) Neutral
    (C) Weak
    (D) Impossible to say

2. Doubling the number of turns of wire in an inductor:
    (A) Reduces the value of inductance by one-half
    (B) Multiplies the value of inductance by two
    (C) Multiplies the value of inductance by four
    (D) Reduces the value of inductance by one-fourth

3. What is the primary difference between primary and secondary cell batteries?
    (A) Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
    (B) Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
    (C) Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
    (D) Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

4. The rise time of a pulse waveform is the time required for the voltage to rise:
    (A) From zero to its rms value
    (B) From zero to its peak value
    (C) From 10% of the peak value to 70.7% of the peak value
    (D) From 10% of the peak value to 90% of the peak value

5. A loadstone is:
    (A) A natural magnet
    (B) A temporary magnet
    (C) An artificial magnet
    (D) A paramagnetic alloy

6. What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
    (A) Electronical energy
    (B) Mechanical energy
    (C) Chemical energy
    (D) Solar energy

7. What are the main parts of an atom?
    (A) Protons only
    (B) Electrons, protons, and ions
    (C) Electrons, ions, and neutrons
    (D) Electrons, protons, and neutrons

8. A high-pass filter:
    (A) Passes lower-frequency signals and reduces higher-frequency signals
    (B) Passes higher-frequency signals and reduces lower-frequency signals
    (C) Has no effect on ac signals
    (D) Increases the level of all frequencies by a significant amount

9. To get the Norton current, you have to
    (A) Short the load resistor
    (B) Open the load resistor
    (C) Short the voltage source
    (D) Open the voltage source

10. If a load resistance is 1 kW, a stiff current source has a resistance of
    (A) At least 10 Ohm
    (B) Less than 10 Ohm
    (C) More than 100 k Ohm
    (D) Less than 100 k Ohm

11. The dielectric constant of a material is a measure of:
    (A) The amount of voltage it can withstand before breaking down
    (B) How well the material concentrates electrostatic lines of force
    (C) The amount of opposition to the current flow
    (D) How well the material concentrates magnetic lines of force

12. Which one of the following statements is true for current flowing in a series circuit?
    (A) The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
    (B) The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
    (C) The same current flows through every part of a series circuit
    (D) The total current in a series circuit is equal to the total voltage multiplied by the total resistance

13. Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold
    (A) 220 Ohm, 5%
    (B) 220 Ohm, 10%
    (C) 22,000 Ohm, 5%
    (D) 22,000 Ohm, 10%

14. For a pure capacitor:
    (A) AC current and voltage are exactly in phase
    (B) AC current leads the voltage by 90 degree
    (C) AC current is converted to dc voltage
    (D) AC current lags the voltage by 90 degree

15. Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?
    (A) Flux density
    (B) Number of lines of force
    (C) Magnetomotive force
    (D) Reluctance

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