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Technician Licensing Class T 5 A - T5D Valid July 1, 2014 Through June 30, 2018 1 T5A • Electrical current is measured in amperes. T5A01 • The basic unit of electrical power is measured in Watts. T5A02 • The name for the flow of electrons in an electric circuit is current. T5A03 2 T5A • The name for a current that flows only in one direction is called direct current. T5A04 Motor cycle battery AAA battery 9 Volt battery Hand held battery • The electrical term for the electromotive force (EMF) that causes electron flow is voltage. T5A05 • A mobile transceiver usually requires 12 volts. T5A06 3 • A mobile transceiver usually requires 12 volts. • Copper is a good electrical conductor. • A good electrical insulator is glass. T5A06 T5A07 T5A08 • The name for a current that reverses direction on a regular basis is alternating current. T5A09 T5A • The term that describes the rate at which electrical energy is used is called Power. T5A10 • The basic unit of electromotive force is voltage. T5A11 • Frequency is the term to describe the number of times per second that an alternating current reverses direction. T5A12 5 T5B • 1.5 amperes is the same as: 1,500 milliamperes. T5B01 • Another way to specify a radio signal frequency of 1,500,000 hertz is: 1500 kHz T5B02 • There are one thousand volts in: One Kilovolt T5B03 • One one-millionth of a volt is equal to: one microvolt T5B04 6 T5B • 500 milliwatts is equivalent to: 0.5 watts. T5B05 • If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, the reading would show: 3 amperes T5B06 • A frequency readout calibrated in megahertz shows a reading of 3.525 MHz, if calibrated in kilohertz it would show: 3525 kHz T5B07 • 1,000,000 picofarads is the same as: 1 microfard T5B08 7 T5B • 3 dB is the approximate amount of change, measured in decibels (dB) of a power increase from 5 watts to 10 watts. T5B09 • The approximate amount of change, measured in decibels (dB) of a power decrease from 12 watts to 3 watts is -6 dB. T5B10 8 T5B • The approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts is 10 dB. T5B11 • 28,400 kHz is equal to: 28.400MHz T5B12 • If a frequency readout shows a reading of 2425 MHz, it can be read as: 2.425 GHz T5B13 9 T5C • The ability to store energy in an electric field is called capacitance. T5C01 • The basic unit of capacitance is the farad. T5C02 • The ability to store energy in a magnetic field is called Inductance. T5C03 • The basic unit of inductance is the henry. • The unit of frequency is the Hertz. T5C04 T5C05 • The abbreviation “RF” refers to radio frequency signals 10 of all types. T5C06 T5C • The usual name for Electromagnetic waves that travel through space are radio waves. T5C07 11 T5C • The formula used to calculate electrical power in a DC circuit is Power (P) equals voltage (E) multiplied by current (I). T5C08 12 T5C • The power being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes is: T5C09 • Solving for “P” so cover up the P and plug in the other two numbers • E is given as 13.8 volts and I is given as 10 amperes P=IxE P = 10 x 13.8 P = 138 Watts T5C • The power being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes is: T5C10 • Solving for “P” so cover up the “P” and plug in the other two numbers • E is given as 12 volts and I is given as 2.5 amperes P=IxE P = 2.5 x 12 P = 30 watts T5C • The amount of current flowing in a circuit when the power in a circuit is 120 watts and the applied voltage is 12 volts is: T5C11 • Solving for “I” so cover up the “I” and plug in the other two numbers • P is given as 120 watts and E is given as 12 volts and I=P/E I = 120 12 I = 10 Amperes 15 T5C • Impedance is a measure of the opposition to AC current flow in a circuit. T5C12 • The unit of impedance is the ohm. T5C13 16 T5D • The formula used to calculate current in a circuit is Current (I) equals Voltage (E) divided by Resistance (R). T5D01 17 T5D • This formula us used to calculate voltage in a circuit: Voltage (E) equals Current (I) multiplied by Resistance (R). T5D02 18 T5D • This formula us used to calculate resistance in a circuit: Resistance (R) equals Voltage (E) divided by Current (I). T5D03 19 T5D • The resistance of a circuit in which a current of 3 amperes flows thru a resistor connected to 90 volts is: T5D04 R=E/I R = 90 3 R = 30 Ohms 20 T5D • The resistance of a circuit in which the applied voltage is 12 volts and the current flow is 1.5 amperes is: T5D05 R=E/I R = 12 1.5 R = 8 Ohms 21 T5D • The resistance of a circuit that draws 4 amperes from a 12-volt source is: T5D06 R=E/I R = 12 4 R = 3 Ohms 22 T5D • The current flowing thru a 80-ohm resistor connected across 120 volts is: T5D07 I=E/R I = 120 80 I = 1.5 Amperes 23 T5D • The current flowing thru a 100-ohm resistor connected across 200 volts is: T5D08 I=E/R I = 200 100 I = 2 Amperes 24 T5D • The current flowing thru a 24-ohm resistor connected across 240 volts is: T5D09 I=E/R I = 240 24 I = 10 Amperes 25 T5D • The voltage across a 2-ohm resistor if a current of 0.5 amperes flows thru it is: T5D10 E=IxR E = 0.5 x 2 E = 1 Volt 26 T5D • The voltage across a 10-ohm resistor if a current of 1 amperes flows thru it is: T5D11 E=IxR E = 1.0 x 10 E = 10 Volts 27 T5D • The voltage across a 10-ohm resistor if a current of 2 amperes flows thru it is: T5D12 E=IxR E = 2.0 x 10 E = 20 Volts 28 Ohms Law Wheel 29 Element 2 Technician Class Question Pool T 5 A –T 5 D Valid July 1, 2014 Through June 30, 2018 30 T5A01 Electrical current is measured in which of the following units? A. B. C. D. Volts Watts Ohms Amperes 31 T5A02 Electrical power is measured in which of the following units? A. B. C. D. Volts Watts Ohms Amperes 32 T5A03 What is the name for the flow of electrons in an electric circuit? A. B. C. D. Voltage Resistance Capacitance Current 33 T5A04 What is the name for a current that flows only in one direction? A. B. C. D. Alternating current Direct current Normal current Smooth current 34 T5A05 What is the electrical term for the electromotive force (EMF) that causes electron flow? A. B. C. D. Voltage Ampere-hours Capacitance Inductance 35 T5A06 How much voltage does a mobile transceiver usually require? A. B. C. D. About 12 volts About 30 volts About 120 volts About 240 volts 36 T5A07 Which of the following is a good electrical conductor? A. B. C. D. Glass Wood Copper Rubber 37 T5A08 Which of the following is a good electrical insulator? A. B. C. D. Copper Glass Aluminum Mercury 38 T5A09 What is the name for a current that reverses direction on a regular basis? A. B. C. D. Alternating current Direct current Circular current Vertical current 39 T5A10 Which term describes the rate at which electrical energy is used? A. B. C. D. Resistance Current Power Voltage 40 T5A11 What is the basic unit of electromotive force? A. B. C. D. The volt The watt The ampere The ohm 41 T5A12 What term describes the number of times per second that an alternating current reverses direction? A. B. C. D. Pulse rate Speed Wavelength Frequency 42 T5B01 How many milliamperes is 1.5 amperes? A. B. C. D. 15 milliamperes 150 milliamperes 1,500 milliamperes 15,000 milliamperes 43 T5B02 What is another way to specify a radio signal frequency of 1,500,000 hertz? A. B. C. D. 1500 kHz 1500 MHz 15 GHz 150 kHz 44 T5B03 How many volts are equal to one kilovolt? A. B. C. D. One one-thousandth of a volt One hundred volts One thousand volts One million volts 45 T5B04 How many volts are equal to one microvolt? A. B. C. D. One one-millionth of a volt One million volts One thousand kilovolts One one-thousandth of a volt 46 T5B05 Which of the following is equivalent to 500 milliwatts? A. B. C. D. 0.02 watts 0.5 watts 5 watts 50 watts 47 T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? A. B. C. D. 0.003 amperes 0.3 amperes 3 amperes 3,000,000 amperes 48 T5B07 If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz? A. B. C. D. 0.003525 kHz 35.25 kHz 3525 kHz 3,525,000 kHz 49 T5B08 How many microfarads are 1,000,000 picofarads? A. B. C. D. 0.001 microfarads 1 microfarad 1000 microfarads 1,000,000,000 microfarads 50 T5B09 What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts? A. B. C. D. 2 dB 3 dB 5 dB 10 dB 51 T5B10 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts? A. B. C. D. -1 dB -3 dB -6 dB -9 dB 52 T5B11 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts? A. B. C. D. 10 dB 12 dB 18 dB 28 dB 53 T5B12 Which of the following frequencies is equal to 28,400 kHz? A. B. C. D. 28.400 MHz 2.800 MHz 284.00 MHz 28.400 kHz 54 T5B13 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? A. B. C. D. 0.002425 GHz 24.25 GHz 2.425 GHz 2425 GHz 55 T5C01 What is the ability to store energy in an electric field called? A. B. C. D. Inductance Resistance Tolerance Capacitance 56 T5C01 What is the ability to store energy in an electric field called? A. B. C. D. Inductance Resistance Tolerance Capacitance 57 T5C03 What is the ability to store energy in a magnetic field called? A. B. C. D. Admittance Capacitance Resistance Inductance 58 T5C04 What is the basic unit of inductance? A. B. C. D. The coulomb The farad The henry The ohm 59 T5C05 What is the unit of frequency? A. B. C. D. Hertz Henry Farad Tesla 60 T5C06 What does the abbreviation “RF” refer to? A. Radio frequency signals of all types B. The resonant frequency of a tuned circuit C. The real frequency transmitted as opposed to the apparent frequency D. Reflective force in antenna transmission lines 61 T5C07 What is a usual name for electromagnetic waves that travel through space? A. B. C. D. Gravity waves Sound waves Radio waves Pressure waves 62 T5C08 A. B. C. D. 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) 63 T5C09 How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? A. B. C. D. 138 watts 0.7 watts 23.8 watts 3.8 watts 64 T5C10 How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? A. B. C. D. 4.8 watts 30 watts 14.5 watts 0.208 watts 65 T5C11 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? A. B. C. D. 0.1 amperes 10 amperes 12 amperes 132 amperes 66 T5C12 What is meant by the term impedance? A. It is a measure of the opposition to AC current flow in a circuit B. It is the inverse of resistance C. It is a measure of the Q or Quality Factor of a component D. It is a measure of the power handling capability of a component 67 T5C13 What are the units of impedance? A. B. C. D. Volts Amperes Coulombs Ohms 68 T5D01 A. B. C. D. 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) 69 T5D02 A. B. C. D. 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) 70 T5D03 A. B. C. D. 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) 71 T5D04 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? A. B. C. D. 3 ohms 30 ohms 93 ohms 270 ohms 72 T5D05 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? A. B. C. D. 18 ohms 0.125 ohms 8 ohms 13.5 ohms 73 T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source? A. B. C. D. 3 ohms 16 ohms 48 ohms 8 ohms 74 T5D07 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? A. B. C. D. 9600 amperes 200 amperes 0.667 amperes 1.5 amperes 75 T5D08 What is the current flowing through a 100-ohm resistor connected across 200 volts? A. B. C. D. 20,000 amperes 0.5 amperes 2 amperes 100 amperes 76 T5D09 What is the current flowing through a 24-ohm resistor connected across 240 volts? A. B. C. D. 24,000 amperes 0.1 amperes 10 amperes 216 amperes 77 T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? A. B. C. D. 1 volt 0.25 volts 2.5 volts 1.5 volts 78 T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? A. B. C. D. 1 volt 10 volts 11 volts 9 volts 79 T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? A. B. C. D. 8 volts 0.2 volts 12 volts 20 volts 80