Practice MCQ Electronic Principles

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9389 Which of the following is not a computer bus?
Options:data bus,    timer bus,    control bus,    address bus

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9390 The technique of assigning a memory address to each I/O device in the SAM system is called:
Options:wired I/O,    I/O mapping,    dedicated I/O,    memory-mapped I/O

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9391 How many bits are used in the data bus?
Options:7,    8,    9,    16

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9392 A port can be:
Options:strictly for input,    strictly for output,    bidirectional,    all the above

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9393 Which of the following is not a basic element within the microprocessor?
Options:microcontroller,    arithmetic-logic unit (ALU),    temporary register,    accumulator

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9394 How many bits are used in the address bus?
Options:7,    8,    9,    16

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9395 Exceptions to the 8085 microprocessor normal operation are called:
Options:jump instructions,    decoding,    interrupts,    jump instructions or interrupts

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9396 When referring to instruction words, a mnemonic is:
Options:a short abbreviation for the operand address,    a short abbreviation for the operation to be performed,    a short abbreviation for the data word stored at the operand address,    shorthand for machine language

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9397 What is the difference between mnemonic codes and machine codes?
Options:There is no difference.,    Machine codes are in binary, mnemonic codes are in shorthand English.,    Machine codes are in shorthand English, mnemonic codes are in binary.,    Machine codes are in shorthand English, mnemonic codes are a high-level language.

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9398 Which bus is bidirectional?
Options:data bus,    control bus,    address bus,    multiplexed bus

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9399 The software used to drive microprocessor-based systems is called:
Options:assembly language programs,    firmware,    BASIC interpreter instructions,    flowchart instructions

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9400 A microprocessor unit, a memory unit, and an input/output unit form a:
Options:CPU,    compiler,    microcomputer,    ALU

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9401 A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
Options:4.73,    0.4 V,    24 V,    600 V

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9402 Which one of the following statements is true for the currents in a parallel RC circuit?
Options:The total current is equal to the sum of the currents for the resistance and capacitance,    The current always has the same amplitude and phase for every part of the circuit,    The total current is less than the sum of the currents for the resistance and capacitance,    The total current. is greater than the sum of the currents for the resistance and capacitance

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9403 Which one of the following statements is true for current flowing in a series circuit?
Options: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,    The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit,    The same current flows through every part of a series circuit,    The total current in a series circuit is equal to the total voltage multiplied by the total resistance

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9404 The total inductance of a series inductor circuit is:
Options:equal to the sum of the individual inductance values,    equal to the sum of the individual inductive-reactance values,    less than the value of the smallest inductor,    equal to the source voltage divided by total current

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9405 When the graph of current versus voltage is a straight line, the device is referred to as
Options:Active,    Linear,    Nonlinear,    Bipolar

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9406 For a pure capacitor:
Options:ac current and voltage are exactly in phase,    ac current leads the voltage by 90 degree,    ac current is converted to dc voltage,    ac current lags the voltage by 90 degree

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9407 The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
Options:rotor,    armature,    battery,    commutator

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9408 In a pure inductor:
Options:ac current leads the voltage by 90 degree,    ac current and voltage are exactly in phase,    ac current lags the voltage by 90 degree,    ac current is converted to dc voltage

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9409 Waveforms are graphs that show:
Options:frequency on the vertical axis and amplitude on the horizontal axis,    amplitude on the vertical axis and frequency on the horizontal axis,    amplitude on the vertical axis and the passage of time on the horizontal axis,    the passage of time on the vertical axis and amplitude on the horizontal axis

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9410 When the collector current increases, what does the current gain do?
Options:decreases,    stays the same,    increases,    any of the above

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9411 How many types of flow are there in a semiconductor?
Options:0,    1,    2,    3

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9412 Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
Options:Ammeter,    Voltmeter,    Ohmmeter,    Wattmeter

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9413 What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
Options:Electronical energy,    Mechanical energy,    Chemical energy,    Solar energy

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9414 Which one of the following statements best applies to a parallel RLC circuit?
Options:The voltage waveform for each component always has the same amplitude and phase as the applied voltage,    The sum of the current is always less than the applied current,    The current waveform for each component always has the same amplitude and phase as the applied current,    All of the above

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9415 The equivalent of 1 micro A is:
Options:10000A,    1000 A,    one-millionth of an ampere,    one million amperes

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9416 Which one of the following statements best describes magnetic hysteresis?
Options:Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet,    Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet,    Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently,    Hysteresis is most apparent when the core material is saturated

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9417 Which one of the following phrases best describes residual magnetism?
Options:Magnetism that remains in the core of an electromagnet after the current through the coil is turned off,    The force of attraction between the poles of a permanent and temporary magnetic field,    The amount of magnetic flux that is not confined to the core material of an electromagnet,    The circular magnetic field that surrounds a conductor carrying a current

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9418 A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
Options:7.8 mA,    208 mA,    200 mA,    300 mA

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9419 Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
Options:P = I2R,    P = IE,    P = E2/R,    I = P/E

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9420 Which one of the following phrases most accurately describes a purely inductive circuit?
Options:Resistances provide the only opposition to current flow,    Inductive reactance provides the only opposition to current flow,    Combinations of resistance and inductive reactance provide any opposition to current flow,    The ac voltage lags the current by 90 degree

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9421 The knee voltage of a diode is approximately equal to the
Options:Applied voltage,    Barrier potential,    Breakdown voltage,    Forward voltage

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9422 A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
Options:310 Ohm,    400 Ohm,    410 Ohm,    550 Ohm

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9423 The rms value of a sine waveform is:
Options:the number of cycles completed in one second,    the time required to complete one full cycle,    equal to 0.707 times the peak amplitude,    equal to 1.41 times the peak amplitude

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9424 Which one of the following is a direct statement of Ohm's law?
Options:The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it,    The total resistance of a parallel circuit is less than the value of the smallest resistance,    The algebraic sum of voltages in a loop is equal to zero,    The algebraic sum of currents entering and leaving a point is equal to zero

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9425 A high-pass filter:
Options:passes lower-frequency signals and reduces higher-frequency signals,    passes higher-frequency signals and reduces lower-frequency signals,    has no effect on ac signals,    increases the level of all frequencies by a significant amount

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9426 Which one of the following statements is true for the voltages in a series RC circuit?
Options:The total voltage is equal to the sum of the voltages across the resistance and capacitance,    The voltage always has the same amplitude and phase for every part of the circuit,    The total voltage is less than the sum of the voltages across the resistance and capacitance,    The total voltage is greater than the sum of the voltages across the resistance and capacitance

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9427 A battery is a device composed of one or more:
Options:chemical cells,    voltage generators,    solar cells,    piezoeletric cells

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9428 Doubling the operating voltage of a purely capacitive circuit:
Options:has no effect on the capacitive reactance,    doubles the amount of capacitive reactance,    multiplies the capacitive reactance by 7,    cuts the capacitive reactance in half

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9429 How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
Options:0.02 A,    0.955 A,    10 A,    2.02 A

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9430 The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
Options:250 μA,    350 μA,    0.25 μA,    300 μA

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9431 What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
Options:180 degree,    30 degree,    45 degree,    75 degree

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9432 Molecule is
Options:The smallest particle of a substance that retains the properties of that substance,    A atom that has a shortage of electrons in its outer orbit,    A atom that has an excessive number of electrons in its outer orbit,    A atom that flows whenever there is an imbalance of electrical charges between two points

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9433 What form of energy is used for creating static electricity?
Options:Solar energy,    Mechanical energy,    Chemical energy,    Light energy

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9434 Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
Options:0.17 V,    10.17 V,    20 V,    18.8 V

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9435 A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
Options:3.75 mA,    3.2 mA,    0.05 mA,    13 mA

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9436 A dielectric material is:
Options:a good conductor,    a good insulator,    a poor conductor of electrostatic fields,    a good conductor of magnetic fields

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9437 A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
Options:0.1 A,    1000 A,    10 A,    100 A

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9438 If a load resistance is 1 kW, a stiff current source has a resistance of
Options:At least 10 Ohm,    Less than 10 Ohm,    More than 100 k Ohm,    Less than 100 k Ohm

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