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Tech - T5 Ham Radio - v2014
Electrical principles, math for electronics, electronic principles, Ohm’s Law – [4 Exam Questions - 4 Groups]
45
Engineering
04/01/2011

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Term
T5A01 Electrical current is measured in which of the following units?
Definition
Amperes
Term
T5A02 Electrical power is measured in which of the following units?
Definition
Watts
Term
T5A03 What is the name for the flow of electrons in an electric circuit?
Definition
Current
Term
T5A04 What is the name for a current that flows only in one direction?
Definition
Direct current
Term
T5A05 What is the electrical term for the electromotive force (EMF) that causes electron flow?
Definition
Voltage
Term
T5A06 How much voltage does a mobile transceiver usually require?
Definition
About 12 volts
Term
T5A07 Which of the following is a good electrical conductor?
Definition
Copper
Term
T5A08 Which of the following is a good electrical insulator?
Definition
Glass
Term
T5A09 What is the name for a current that reverses direction on a regular basis?
Definition
Alternating current
Term
T5A10 Which term describes the rate at which electrical energy is used?
Definition
Power
Term
T5A11 What is the basic unit of electromotive force?
Definition
The volt
Term
T5B01 How many milliamperes is 1.5 amperes?
Definition
1,500 milliamperes
Term
T5B02 What is another way to specify a radio signal frequency of 1,500,000 hertz?
Definition
1500 kHz
Term
T5B03 How many volts are equal to one kilovolt?
Definition
One thousand volts
Term
T5B04 How many volts are equal to one microvolt?
Definition
One one-millionth of a volt
Term
T5B05 Which of the following is equivalent to 500 milliwatts?
Definition
0.5 watts
Term
T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?
Definition
3 amperes
Term
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?
Definition
3525 kHz
Term
T5B08 How many microfarads are 1,000,000 picofarads?
Definition
1 microfarad
Term
T5B09 What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?
Definition
3 dB
Term
T5B10 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?
Definition
6 dB
Term
T5B11 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?
Definition
10 dB
Term
T5C01 What is the ability to store energy in an electric field called?
Definition
Capacitance
Term
T5C02 What is the basic unit of capacitance?
Definition
The farad
Term
T5C03 What is the ability to store energy in a magnetic field called?
Definition
Inductance
Term
T5C04 What is the basic unit of inductance?
Definition
The henry
Term
T5C05 What is the unit of frequency?
Definition
Hertz
Term
T5C06 What is the abbreviation that refers to radio frequency signals of all types?
Definition
RF
Term
What is a usual name for electromagnetic waves that travel through space?
Definition
Radio waves
Term
T5C08 What is the formula used to calculate electrical power in a DC circuit?
Definition
Power (P) equals voltage (E) multiplied by current (I)
Term
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?
Definition
138 watts
Term
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?
Definition
30 watts
Term
T5C11 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
Definition
10 amperes
Term
T5D01 What formula is used to calculate current in a circuit?
Definition
Current (I) equals voltage (E) divided by resistance (R)
Term
T5D02 What formula is used to calculate voltage in a circuit?
Definition
Voltage (E) equals current (I) multiplied by resistance (R)
Term
T5D03 What formula is used to calculate resistance in a circuit?
Definition
Resistance (R) equals voltage (E) divided by current (I)
Term
T5D04 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
Definition
30 ohms
Term
T5D05 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
Definition
8 ohms
Term
T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
Definition
3 ohms
Term
T5D07 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
Definition
1.5 amperes
Term
T5D08 What is the current flowing through a 100-ohm resistor connected across 200 volts?
Definition
2 amperes
Term
T5D09 What is the current flowing through a 24-ohm resistor connected across 240 volts?
Definition
10 amperes
Term
T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
Definition
1 volt
Term
T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
Definition
10 volts
Term
T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
Definition
20 volts