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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. Canadian Basic Qualification Question PoolPrev 1 2 3 4 5 6 7 8 NextB-005-01-01 If a dial marked in megahertz shows a reading of 3.525 MHz, what would it show if it were marked in kilohertz? 35.25 kHz 3525 kHz 3 525 000 kHz 0.003525 kHz B-005-01-02 If an ammeter marked in amperes is used to measure a 3000 milliampere current, what reading would it show? 3 amperes 0.003 ampere 0.3 ampere 3 000 000 amperes B-005-01-03 If a voltmeter marked in volts is used to measure a 3500 millivolt potential, what reading would it show? 3.5 volts 0.35 volt 35 volts 350 volts B-005-01-04 How many microfarads is 1 000 000 picofarads? 1 000 000 000 microfarads 1000 microfarads 1 microfarad 0.001 microfarad B-005-01-05 If you have a hand-held transceiver which puts out 500 milliwatts, how many watts would this be? 5 0.5 50 0.02 B-005-01-06 A kilohm is: 0.1 ohm 0.001 ohm 10 ohms 1000 ohms B-005-01-07 6.6 kilovolts is equal to: 6600 volts 660 volts 66 volts 66 000 volts B-005-01-08 A current of one quarter ampere may be written as: 0.5 amperes 0.25 milliampere 250 microampere 250 milliamperes B-005-01-09 How many millivolts are equivalent to two volts? 0.000002 2 000 2 000 000 0.002 B-005-01-10 One megahertz is equal to: 1 000 kHz 100 kHz 0.001 Hz 10 Hz B-005-01-11 An inductance of 10 000 microhenrys may be stated correctly as: 100 millihenrys 10 henrys 1 000 henrys 10 millihenrys B-005-02-01 Name three good electrical conductors. Gold, silver, wood Gold, silver, aluminum Copper, aluminum, paper Copper, gold, mica B-005-02-02 Name four good electrical insulators. Plastic, rubber, wood, carbon Paper, glass, air, aluminum Glass, air, plastic, porcelain Glass, wood, copper, porcelain B-005-02-03 Why do resistors sometimes get hot when in use? Their reactance makes them heat up Hotter circuit components nearby heat them up They absorb magnetic energy which makes them hot Some electrical energy passing through them is lost as heat B-005-02-04 What is the best conductor among the following materials? carbon silicon aluminium copper B-005-02-05 The material listed, which will most readily allow an electric current to flow, is called? a conductor an insulator a resistor a dielectric B-005-02-06 A length of metal is connected in a circuit and is found to conduct electricity very well. It would be best described as having a: high resistance high wattage low wattage low resistance B-005-02-07 The letter "R" is the symbol for: impedance resistance reluctance reactance B-005-02-08 The reciprocal of resistance is: conductance reactance reluctance permeability B-005-02-09 Voltage drop means: voltage developed across the terminals of a component any point in a radio circuit which has zero voltage difference in voltage at output terminals of a transformer the voltage which is dissipated before useful work is accomplished B-005-02-10 The resistance of a conductor changes with: voltage temperature current humidity B-005-02-11 The most common material used to make a resistor is: carbon gold mica lead B-005-03-01 What is the word used to describe how fast electrical energy is used? Current Power Voltage Resistance B-005-03-02 If you have light bulbs marked 40 watts, 60 watts and 100 watts, which one will use electrical energy the fastest? They will all be the same The 40 watt bulb The 100 watt bulb The 60 watt bulb B-005-03-03 What is the basic unit of electrical power? The ampere The volt The watt The ohm B-005-03-04 Which electrical circuit will have no current? A short circuit An open circuit A complete circuit A closed circuit B-005-03-05 Which electrical circuit uses too much current? A dead circuit A short circuit A closed circuit An open circuit B-005-03-06 Power is expressed in: volts amperes watts ohms B-005-03-07 Which of the following two quantities should be multiplied together to find power? Inductance and capacitance Voltage and inductance Voltage and current Resistance and capacitance B-005-03-08 Which two electrical units multiplied together give the unit "watts"? Volts and farads Farads and henrys Amperes and henrys Volts and amperes B-005-03-09 A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much: voltage resistance current power B-005-03-10 High power resistors are usually large with heavy leads. The size aids the operation of the resistor by: allowing higher voltage to be handled increasing the effective resistance of the resistor allowing heat to dissipate more readily making it shock proof B-005-03-11 The resistor that could dissipate the most heat would be marked: 100 ohms 2 ohms 20 watts 0.5 watt B-005-04-01 If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor? 48 volts 52 volts 100 volts 25 volts B-005-04-02 How is the current in a DC circuit calculated when the voltage and resistance are known? Current equals voltage divided by resistance Current equals resistance multiplied by voltage Current equals resistance divided by voltage Current equals power divided by voltage B-005-04-03 How is the resistance in a DC circuit calculated when the voltage and current are known? Resistance equals current multiplied by voltage Resistance equals voltage divided by current Resistance equals power divided by voltage Resistance equals current divided by voltage B-005-04-04 How is the voltage in a DC circuit calculated when the current and resistance are known? Voltage equals current divided by resistance Voltage equals resistance divided by current Voltage equals power divided by current Voltage equals current multiplied by resistance B-005-04-05 If a 12-volt battery supplies 0.25 ampere to a circuit, what is the circuit's resistance? 3 ohms 48 ohms 12 ohms 0.25 ohm B-005-04-06 Calculate the value of resistance necessary to drop 100 volts with current flow of .8 milliamperes: 125 kilohms 125 ohms 1250 ohms 1.25 kilohms B-005-04-07 The voltage required to force a current of 4.4 amperes through a resistance of 50 ohms is: 220 volts 2220 volts 22.0 volts 0.220 volt B-005-04-08 A lamp has a resistance of 30 ohms and a 6 volt battery is connected. The current flow will be: 2 amperes 0.5 ampere 0.005 ampere 0.2 ampere B-005-04-09 What voltage would be needed to supply a current of 200 mA, to operate an electric lamp which has a resistance of 25 ohms? 5 volts 8 volts 175 volts 225 volts B-005-04-10 The resistance of a circuit can be found by using one of the following: R = E/I R = I/E R = E/R R = E X I B-005-04-11 If a 3 volt battery supplies 300 mA to a circuit, the circuit resistance is: 10 ohms 9 ohms 5 ohms 3 ohms B-005-05-01 In a parallel circuit with a voltage source and several branch resistors, how is the total current related to the current in the branch resistors? It equals the sum of the branch current through each resistor It equals the average of the branch current through each resistor It decreases as more parallel resistors are added to the circuit It is the sum of each resistor's voltage drop multiplied by the total number of resistors B-005-05-02 A 6 volt battery is connected across three resistances of connected in parallel. The current through the 10 ohms, 15 ohms and 20 ohms separate resistances, when added together, equals the total current drawn from the battery The current flowing through the 10 ohm resistance is less than that flowing through the 20 ohm resistance The voltage drop across each resistance added together equals 6 volts The voltage drop across the 20 ohm resistance is greater than the voltage across the 10 ohm resistance B-005-05-03 Total resistance in a parallel circuit: is always less than the smallest resistance depends upon the IR drop across each branch could be equal to the resistance of one branch depends upon the applied voltage B-005-05-04 Two resistors are connected in parallel and are connected across a 40 volt battery. If each resistor is 1000 ohms, the total current is: 80 milliamperes 40 milliamperes 80 amperes 40 amperes B-005-05-05 The total resistance of resistors connected in series is: greater than the resistance of any one resistor less than the resistance of any one resistor equal to the highest resistance present equal to the lowest resistance present B-005-05-06 Five 10 ohm resistors connected in series equals: 50 ohms 5 ohms 10 ohms 1 ohm B-005-05-07 Which series combination of resistors would replace a single 120 ohm resistor? six 22 ohm two 62 ohm five 100 ohm five 24 ohm B-005-05-08 If ten resistors of equal value were wired in parallel, the total resistance would be: 10 / R R / 10 10 x R 10 + R B-005-05-09 The total resistance of four 68 ohm resistors wired in parallel is: 12 ohms 34 ohms 272 ohms 17 ohms B-005-05-10 Two resistors are in parallel. Resistor A carries twice the current of resistor B, which means that: the voltage across B is twice that across A the voltage across A is twice that across B A has half the resistance of B B has half the resistance of A B-005-05-11 The total current in a parallel circuit is equal to the: source voltage divided by the value of one of the resistive elements sum of the currents through all the parallel branches source voltage divided by the sum of the resistive elements current in any one of the parallel branches B-005-06-01 Why would a large size resistor be used instead of a smaller one of the same resistance? For better response time For a higher current gain For less impedance in the circuit For greater power dissipation B-005-06-02 How many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 ampere? 2.4 watts 60 watts 24 watts 6 watts B-005-06-03 The DC input power of a transmitter operating at 12 volts and drawing 500 milliamps would be: 20 watts 6 watts 500 watts 12 watts B-005-06-04 When two 500 ohm 1 watt resistors are connected in series, the maximum total power that can be dissipated by the resistors is: 1 watt 2 watts 1/2 watt 4 watts B-005-06-05 When two 500 ohm 1 watt resistors are connected in parallel, they can dissipate a maximum total power of: 1/2 watt 1 watt 2 watts 4 watts B-005-06-06 If the voltage applied to two resistors in series is doubled, how much will the total power change? increase four times decrease to half double no change B-005-06-07 If the power is 500 watts and the resistance is 20 ohms, the current is: 2.5 amps 10 amps 25 amps 5 amps B-005-06-08 A 12 volt light bulb is rated at a power of 30 watts. The current drawn would be: 30/12 amps 18 amps 360 amps 12/30 amps B-005-06-09 If two 10 ohm resistors are connected in series with a 10 volt battery, the power consumption would be: 5 watts 10 watts 20 watts 100 watts B-005-06-10 One advantage of replacing a 50 ohm resistor with a parallel combination of two similarly rated 100 ohm resistors is that the parallel combination will have: the same resistance but lesser power rating greater resistance and similar power rating the same resistance but greater power rating lesser resistance and similar power rating B-005-06-11 Resistor wattage ratings are: calculated according to physical size expressed in joules per second determined by heat dissipation qualities variable in steps of one hundred B-005-07-01 What term means the number of times per second that an alternating current flows back and forth? Speed Pulse rate Frequency Inductance B-005-07-02 Approximately what frequency range can most humans hear? 20 000 - 30 000 Hz 200 - 200 000 Hz 20 - 20 000 Hz 0 - 20 Hz B-005-07-03 Why do we call signals in the range 20 Hz to 20 000 Hz audio frequencies? Because the human ear cannot sense anything in this range Because this range is too low for radio energy Because the human ear can sense radio waves in this range Because the human ear can sense sounds in this range B-005-07-04 Electrical energy at a frequency of 7125 kHz is in what frequency range? Radio Audio Hyper Super-high B-005-07-05 What is the name for the distance an AC signal travels during one complete cycle? Wavelength Wave speed Waveform Wave spread B-005-07-06 What happens to a signal's wavelength as its frequency increases? It gets longer It stays the same It disappears It gets shorter B-005-07-07 What happens to a signal's frequency as its wavelength gets longer? It disappears It stays the same It goes down It goes up B-005-07-08 What does 60 hertz (Hz) mean? 6000 metres per second 60 cycles per second 60 metres per second 6000 cycles per second B-005-07-09 If the frequency of the waveform is 100 Hz, the time for one cycle is: 10 seconds 0.0001 second 0.01 second 1 second B-005-07-10 Current in an AC circuit goes through a complete cycle in 0.1 second. This means the AC has a frequency of: 10 Hz 1 Hz 100 Hz 1000 Hz B-005-07-11 A signal is composed of a fundamental frequency of 2 kHz and another of 4 kHz. This 4 kHz signal is referred to as: a fundamental of the 2 kHz signal the DC component of the main signal a dielectric signal of the main signal a harmonic of the 2 kHz signal B-005-08-01 A two-times increase in power results in a change of how many dB? 6 dB higher 3 dB higher 12 dB higher 1 dB higher B-005-08-02 How can you decrease your transmitter's power by 3 dB? Divide the original power by 1.5 Divide the original power by 3 Divide the original power by 4 Divide the original power by 2 B-005-08-03 How can you increase your transmitter's power by 6 dB? Multiply the original power by 3 Multiply the original power by 2 Multiply the original power by 4 Multiply the original power by 1.5 B-005-08-04 If a signal-strength report is "10 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts? S9 plus 3 dB S9 minus 10 dB S9 plus 5 dB S9 B-005-08-05 If a signal-strength report is "20 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts? S9 plus 10 dB S9 plus 5 dB S9 plus 3 dB S9 B-005-08-06 The unit "decibel" is used to indicate: an oscilloscope wave form a mathematical ratio certain radio waves a single side band signal B-005-08-07 The power output from a transmitter increases from 1 watt to 2 watts. This is a db increase of: 30 6 3 1 B-005-08-08 The power of a transmitter is increased from 5 watts to 50 watts by a linear amplifier. The power gain, expressed in dB, is: 30 dB 10 dB 40 dB 20 dB B-005-08-09 You add a 9 dB gain amplifier to your 2 watt handheld. What is the power output of the combination? 11 watts 16 watts 20 watts 18 watts B-005-08-10 The power of a transmitter is increased from 2 watts to 8 watts. This is a power gain of __________ dB. 6 dB 3 dB 8 dB 9 dB B-005-08-11 A local amateur reports your 100W 2M simplex VHF transmission as 30 dB over S9. To reduce your signal to S9, you would reduce your power to ______ watts. 1 W 10 W 33.3 W 100 mW B-005-09-01 If two equal-value inductors are connected in series, what is their total inductance? Half the value of one inductor The same as the value of either inductor The value of one inductor times the value of the other Twice the value of one inductor B-005-09-02 If two equal-value inductors are connected in parallel, what is their total inductance? Twice the value of one inductor The same as the value of either inductor The value of one inductor times the value of the other Half the value of one inductor B-005-09-03 If two equal-value capacitors are connected in series, what is their total capacitance? Twice the value of one capacitor The same as the value of either capacitor The value of one capacitor times the value of the other Half the value of either capacitor B-005-09-04 If two equal-value capacitors are connected in parallel, what is their total capacitance? The same as the value of either capacitor Twice the value of one capacitor The value of one capacitor times the value of the other Half the value of one capacitor B-005-09-05 What determines the inductance of a coil? The core material, the number of turns used to wind the core and the frequency of the current through the coil The core diameter, the number of turns of wire used to wind the coil and the type of metal used for the wire The core material, the core diameter, the length of the coil and the number of turns of wire used to wind the coil The core material, the core diameter, the length of the coil and whether the coil is mounted horizontally or vertically B-005-09-06 What determines the capacitance of a capacitor? The material between the plates, the area of one side of one plate, the number of plates and the spacing between the plates The material between the plates, the number of plates and the size of the wires connected to the plates The number of plates, the spacing between the plates and whether the dielectric material is N type or P type The material between the plates, the area of one plate, the number of plates and the material used for the protective coating B-005-09-07 If two equal-value capacitors are connected in parallel, what is their capacitance? The same value of either capacitor The value of one capacitor times the value of the other Half the value of either capacitor Twice the value of either capacitor B-005-09-08 To replace a faulty 10 millihenry choke, you could use two: Two 20 millihenry chokes in series Two 5 millihenry chokes in series Two 30 millihenry chokes in parallel Two 5 millihenry chokes in parallel B-005-09-09 Three 15 microfarad capacitors are wired in series. The total capacitance of this arrangement is: 45 microfarads 12 microfarads 5 microfarads 18 microfarads B-005-09-10 Which series combinations of capacitors would best replace a faulty 10 microfarad capacitor? two 10 microfarad capacitors two 20 microfarad capacitors twenty 2 microfarad capacitors ten 2 microfarad capacitors B-005-09-11 The total capacitance of two or more capacitors in series is: found by adding each of the capacitors together and dividing by the total number of capacitors found by adding each of the capacitors together always less than the smallest capacitor B-005-10-01 How does a coil react to AC? As the amplitude of the applied AC increases, the reactance decreases As the amplitude of the applied AC increases, the reactance increases As the frequency of the applied AC increases, the reactance increases As the frequency of the applied AC increases, the reactance decreases B-005-10-02 How does a capacitor react to AC? As the frequency of the applied AC increases, the reactance decreases As the frequency of the applied AC increases, the reactance increases As the amplitude of the applied AC increases, the reactance increases As the amplitude of the applied AC increases, the reactance decreases B-005-10-03 The reactance of capacitors increases as: applied voltage increases AC frequency decreases applied voltage decreases AC frequency increases B-005-10-04 In inductances, AC may be opposed by both resistance of winding wire and reactance due to inductive effect. The term which includes resistance and reactance is: resonance inductance impedance capacitance B-005-10-05 Capacitive reactance: decreases as frequency increases applies only to series RLC circuits increases as frequency increases increases with the time constant B-005-10-06 Inductive reactance may be increased by: a decrease in the applied frequency a decrease in the supplied current an increase in the applied voltage an increase in the applied frequency B-005-10-07 A choke coil of 4.25 microhenrys is used in a circuit at a frequency of 200 MHz. Its reactance is approximately: 5 740 ohms 5 340 ohms 7 540 ohms 4 750 ohms B-005-10-08 The capacitive reactance of a 25 microfarad capacitor connected to a 60 hertz line is: 106.1 ohms 9 420 ohms 2.4 ohms 1 500 ohms B-005-10-09 A power-supply filter has a capacitor of 10 microfarad. What is the capacitive reactance of this capacitor to a frequency of 60 hertz? 200 ohms 100 ohms 500 ohms 265 ohms B-005-10-10 What is the approximate inductive reactance of a 1 henry choke coil used in a 60 hertz circuit? 376 ohms 3760 ohms 188 ohms 1888 ohms B-005-10-11 In general, the reactance of inductors increases with: increasing AC frequency decreasing AC frequency decreasing applied voltage increasing applied voltage B-005-11-01 If no load is attached to the secondary winding of a transformer, what is current in the primary winding called? Magnetizing current Direct current Excitation current Stabilizing current B-005-11-02 A transformer operates a 6.3 volt 2 ampere light bulb from its secondary winding. The power consumed by the primary winding is approximately: 13 watts 6 watts 8 watts 3 watts B-005-11-03 A transformer has a 240 volt primary that draws a current of 250 mA from the mains supply. Assuming no losses, what current would be available from a 12 volt secondary? 215 amperes 25 amperes 50 amperes 5 amperes B-005-11-04 In a mains power transformer, the primary winding has 250 turns, and the secondary has 500. If the input voltage is 110 volts, the likely secondary voltage is: 440 V 220 V 560 V 24 V B-005-11-05 The strength of the magnetic field around a conductor in air is: inversely proportional to the diameter of the conductor directly proportional to the diameter of the conductor directly proportional to the current in the conductor inversely proportional to the voltage on the conductor B-005-11-06 Maximum induced voltage in a coil occurs when: current is going through its greatest rate of change the current through the coil is of a DC nature current is going through its least rate of change the magnetic field around the coil is not changing B-005-11-07 The voltage induced in a conductor moving in a magnetic field is at a maximum when the movement is: made in a counterclockwise direction parallel to the lines of force perpendicular to the lines of force made in a clockwise direction B-005-11-08 A 100% efficient transformer has a turns ratio of 1/5. If the secondary current is 50 mA, the primary current is: 2 500 mA 0.01 A 0.25 A 0.25 mA B-005-11-09 A force of repulsion exists between two _________ magnetic poles. unlike positive negative like B-005-11-10 A permanent magnet would most likely be made from: copper aluminum brass steel B-005-11-11 The fact that energy transfer from primary to secondary windings in a power transformer is not perfect is indicated by: electrostatic shielding large secondary currents warm iron laminations high primary voltages B-005-12-01 Resonance is the condition that exists when: inductive reactance and capacitive reactance are equal inductive reactance is the only opposition in the circuit the circuit contains no resistance resistance is equal to the reactance B-005-12-02 Parallel tuned circuits offer: low impedance at resonance zero impedance at resonance an impedance equal to resistance of the circuit very high impedance at resonance B-005-12-03 Resonance is an electrical property used to describe: an inductor a set of parallel inductors the results of tuning a varicap (varactor) the frequency characteristic of a coil and capacitor circuit B-005-12-04 A tuned circuit is formed from two basic components. These are: resistors and transistors directors and reflectors diodes and transistors inductors and capacitors B-005-12-05 When a parallel coil-capacitor combination is supplied with AC of different frequencies, there will be one frequency where the impedance will be highest. This is the: resonant frequency impedance frequency inductive frequency reactive frequency B-005-12-06 In a parallel-resonant circuit at resonance, the circuit has a: low impedance low mutual inductance high mutual inductance high impedance B-005-12-07 In a series resonant circuit at resonance, the circuit has: low impedance high impedance low mutual inductance high mutual inductance B-005-12-08 A coil and an air-spaced capacitor are arranged to form a resonant circuit. The resonant frequency will remain the same if we: increase the area of plates in the capacitor replace the air dielectric with oil in the capacitor wind more turns on the coil add a resistor to the circuit B-005-12-09 Resonant circuits in a receiver are used to: filter direct current select signal frequencies increase power adjust voltage levels B-005-12-10 Resonance is the condition that exists when: inductive reactance and capacitive reactance are equal and opposite in sign inductive reactance is the only opposition in the circuit the circuit contains no resistance resistance is equal to the reactance B-005-12-11 When a series LCR circuit is tuned to the frequency of the source, the: line current lags the applied voltage line current leads the applied voltage line current reaches maximum impedance is maximum B-005-13-01 How is a voltmeter usually connected to a circuit under test? In series with the circuit In quadrature with the circuit In phase with the circuit In parallel with the circuit B-005-13-02 How is an ammeter usually connected to a circuit under test? In quadrature with the circuit In series with the circuit In phase with the circuit In parallel with the circuit B-005-13-03 What does a multimeter measure? Resistance, capacitance and inductance Voltage, current and resistance Resistance and reactance SWR and power B-005-13-04 The correct instrument to measure plate current or collector current of a transmitter is: an ohmmeter a wattmeter an ammeter a voltmeter B-005-13-05 Which of the following meters would you use to measure the power supply current drawn by a small hand-held transistorized receiver? a DC ammeter an RF ammeter an RF power meter an electrostatic voltmeter B-005-13-06 When measuring current drawn from a DC power supply, it is true to say that the meter will act in circuit as: a perfect conductor a low value resistance an extra current drain an insulator B-005-13-07 When measuring the current drawn by a receiver from a power supply, the current meter should be placed: in series with both receiver power leads in series with one of the receiver power leads in parallel with both receiver power supply leads in parallel with one of the receiver power leads B-005-13-08 Potential difference is measured by means of: a wattmeter an ohmmeter a voltmeter an ammeter B-005-13-09 Voltage drop means: the voltage which is dissipated before useful work is accomplished difference in voltage at output terminals of a transformer voltage between the terminals of a component any point in a radio circuit which has zero voltage B-005-13-10 The instrument used for measuring the flow of electrical current is the: faradmeter wattmeter ammeter voltmeter B-005-13-11 In measuring volts and amperes, the connections should be made with: the voltmeter in series and ammeter in parallel the voltmeter in parallel and ammeter in series both voltmeter and ammeter in series both voltmeter and ammeter in parallel |
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