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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. Technician Class Question PoolPrev 1 2 3 4 5 6 7 8 9 0 NextT4A01 Electrical current is measured in which of the following units? Volts Watts Ohms Amperes T4A02 Electrical Power is measured in which of the following units? Volts Watts Ohms Amperes T4A03 What is the name for the flow of electrons in an electric circuit? Voltage Resistance Capacitance Current T4A04 What is the name of a current that flows only in one direction? An alternating current A direct current A normal current A smooth current T4A05 What is the standard unit of frequency? The megacycle The Hertz One thousand cycles per second The electromagnetic force T4A06 How much voltage does an automobile battery usually supply? About 12 volts About 30 volts About 120 volts About 240 volts T4A07 What is the basic unit of resistance? The volt The watt The ampere The ohm T4A08 What is the name of a current that reverses direction on a regular basis? An alternating current A direct current A circular current A vertical current T4A09 Which of the following is a good electrical conductor? Glass Wood Copper Rubber T4A10 Which of the following is a good electrical insulator? Copper Glass Aluminum Mercury T4A11 What is the term used to describe opposition to current flow in ordinary conductors such as wires? Inductance Resistance Counter EMF Magnetism T4A12 What instrument is used to measure the flow of current in an electrical circuit? Frequency meter SWR meter Ammeter Voltmeter T4A13 What instrument is used to measure Electromotive Force (EMF) between two points such as the poles of a battery? Magnetometer Voltmeter Ammeter Ohmmeter T4B01 What is the name for the distance a radio wave travels during one complete cycle? Wave speed Waveform Wavelength Wave spread T4B02 What term describes the number of times that an alternating current flows back and forth per second? Pulse rate Speed Wavelength Frequency T4B03 What does 60 hertz (Hz) mean? 6000 cycles per second 60 cycles per second 6000 meters per second 60 meters per second T4B04 Electromagnetic waves that oscillate more than 20,000 times per second as they travel through space are generally referred to as what? Gravity waves Sound waves Radio waves Gamma radiation T4B05 How fast does a radio wave travel through space? At the speed of light At the speed of sound Its speed is inversely proportional to its wavelength Its speed increases as the frequency increases T4B06 How does the wavelength of a radio wave relate to its frequency? The wavelength gets longer as the frequency increases The wavelength gets shorter as the frequency increases There is no relationship between wavelength and frequency The wavelength depends on the bandwidth of the signal T4B07 What is the formula for converting frequency to wavelength in meters? Wavelength in meters equals frequency in Hertz multiplied by300 Wavelength in meters equals frequency in Hertz divided by 300 Wavelength in meters equals frequency in megahertz divided by300 Wavelength in meters equals 300 divided by frequency in megahertz T4B08 What are sound waves in the range between 300 and 3000 Hertz called? Test signals Ultrasonic waves Voice frequencies Radio frequencies T4B09 What property of a radio wave is often used to identify the different bands amateur radio operators use? The physical length of the wave The magnetic intensity of the wave The time it takes for the wave to travel one mile The voltage standing wave ratio of the wave T4B10 What is the frequency range of the 2 meter band in the United States? 144 to 148 MHz 222 to 225 MHz 420 to 450 MHz 50 to 54 MHz T4B11 What is the frequency range of the 6 meter band in the United States? 144 to 148 MHz 222 to 225 MHz 420 to 450 MHz 50 to 54 MHz T4B12 What is the frequency range of the 70 centimeter band in the United States? 144 to 148 MHz 222 to 225 MHz 420 to 450 MHz 50 to 54 MHz T4C01 What is used to convert radio signals into sounds we can hear? Transmitter Receiver Microphone Antenna T4C02 What is used to convert sounds from our voice into radio signals? Transmitter Receiver Speaker Antenna T4C03 What two devices are combined into one unit in a transceiver? Receiver, transmitter Receiver, transformer Receiver, transistor Transmitter, deceiver T4C04 What device is used to convert the alternating current from a wall outlet into low-voltage direct current? Inverter Compressor Power Supply Demodulator T4C05 What device is used to increase the output of a 10 watt radio to 100 watts? Amplifier Power supply Antenna Attenuator T4C06 Which of the battery types listed below offers the longest life when used with a hand-held radio, assuming each battery is the same physical size? Lead-acid Alkaline Nickel-cadmium Lithium-ion T4C07 What is the nominal voltage per cell of a fully charged nickel cadmium battery? 1.0 volts 1.2 volts 1.5 volts 2.2 volts T4C08 What battery type on this list is not designed to be re-charged? Nickel-cadmium Carbon-zinc Lead-acid Lithium-ion T4C09 What is required to keep rechargeable batteries in good condition and ready for emergencies? They must be inspected for physical damage and replaced if necessary They should be stored in a cool and dry location They must be given a maintenance recharge at least every 6months All of these answers are correct T4C10 What is the best way to get the most amount of energy from a battery? Draw current from the battery as rapidly as possible Draw current from the battery at the slowest rate needed Reverse the leads when the battery reaches the 1/2 charge level Charge the battery as frequently as possible T4D01 What formula is used to calculate current in a circuit? Current (I) equals voltage (E) multiplied by resistance (R) Current (I) equals voltage (E) divided by resistance (R) Current (I) equals voltage (E) added to resistance (R) Current (I) equals voltage (E) minus resistance (R) T4D02 What formula is used to calculate voltage in a circuit? Voltage (E) equals current (I) multiplied by resistance (R) Voltage (E) equals current (I) divided by resistance (R) Voltage (E) equals current (I) added to resistance (R) Voltage (E) equals current (I) minus resistance (R) T4D03 What formula is used to calculate resistance in a circuit? Resistance (R) equals voltage (E) multiplied by current (I) Resistance (R) equals voltage (E) divided by current (I) Resistance (R) equals voltage (E) added to current (I) Resistance (R) equals voltage (E) minus current (I) T4D04 What is the resistance of a circuit when a current of 3 amperes flows through a resistor connected to 90 volts? 3 ohms 30 ohms 93 ohms 270 ohms T4D05 What is the resistance in a circuit where the applied voltage is 12 volts and the current flow is 1.5 amperes? 18 ohms 0.125 ohms 8 ohms 13.5 ohms T4D06 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? 9600 amperes 200 amperes 0.667 amperes 1.5 amperes T4D07 What is the voltage across the resistor if a current of 0.5 amperes flows through a 2 ohm resistor? 1 volt 0.25 volts 2.5 volts 1.5 volts T4D08 What is the voltage across the resistor if a current of 1 ampere flows through a 10 ohm resistor? 10 volts 1 volt 11 volts 9 volts T4D09 What is the voltage across the resistor if a current of 2 amperes flows through a 10 ohm resistor? 20 volts 0.2 volts 12 volts 8 volts T4D10 What is the current flowing through a 100 ohm resistor connected across 200 volts? 20,000 amperes 0.5 amperes 2 amperes 100 amperes T4D11 What is the current flowing through a 24 ohm resistor connected across 240 volts? 24,000 amperes 0.1 amperes 10 amperes 216 amperes T4E01 What unit is used to describe electrical power? Ohm Farad Volt Watt T4E02 What is the formula used to calculate electrical power in a DC circuit? Power (P) equals voltage (E) multiplied by current (I) Power (P) equals voltage (E) divided by current (I) Power (P) equals voltage (E) minus current (I) Power (P) equals voltage (E) plus current (I) T4E03 How much power is represented by a voltage of 13.8 volts DC and a current of 10 amperes? 138 watts 0.7 watts 23.8 watts 3.8 watts T4E04 How much power is being used in a circuit when the voltage is 120 volts DC and the current is 2.5 amperes? 1440 watts 300 watts 48 watts 30 watts T4E05 How can you determine how many watts are being drawn by your transceiver when you are transmitting? Measure the DC voltage and divide it by 60 Hz Check the fuse in the power leads to see what size it is Look in the Radio Amateur's Handbook Measure the DC voltage at the transceiver and multiply by the current drawn when you transmit T4E06 How many amperes are flowing in a circuit when the applied voltage is 120 volts DC and the load is 1200 watts? 20 amperes 10 amperes 120 amperes 5 amperes T4E07 How many milliamperes is the same as 1.5 amperes? 15 milliamperes 150 milliamperes 1500 milliamperes 15000 milliamperes T4E08 What is another way to specify the frequency of a radio signal that is oscillating at 1,500,000 Hertz? 1500 kHz 1500 MHz 15 GHz 150 kHz T4E09 How many volts are equal to one kilovolt? one one-thousandth of a volt one hundred volts one thousand volts one million volts T4E10 How many volts are equal to one microvolt? one one-millionth of a volt one million volts one thousand kilovolts one one-thousandth of a volt T4E11 How many watts does a hand-held transceiver put out if the output power is 500 milliwatts? 0.02 watts 0.5 watts 5 watts 50 watts |
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