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Electronics ETA Certification Practice Exam.
The "triboelectric effect" causes what kind of electricity? - ANSWERStatic The law of static electrical charges states: - ANSWERlike charges repel Minute particles that make up all possible elements and still retain the unique chemical characteristics of the element are called _____________. - ANSWERAtoms A molecule is the smallest particle of matter that can exist by itself. (1) - ANSWERTrue (1) A basic atom must contain what two types of subatomic particles? - ANSWERElectron and proton An electron has _______________. - ANSWERa Negative charge What two types of energy are used throughout electronics? - ANSWERKinetic and potential Electrical direct current flowing in a wire produces a magnetic field: - ANSWERat right angles to current flow A material is magnetized when the: - ANSWERdomains are in alignment
A material that can be magnetized easily falls into this category: - ANSWERFerromagnetic Invisible lines of force that surround a magnet are called ___________________. - ANSWERmagnetic flux lines The pole of a magnet from which flux leaves is called the __________________. - ANSWERnorth _________________ force produces magnetic flux. - ANSWERMagnetomotive What class of fire extinguisher is used on an oil fire? - ANSWERB It is dangerous to use wooden handled tools around high voltage due to their ability to absorb moisture. (2) - ANSWERTrue (2) In order to eliminate possible fire hazards, rags should be stored in ________________ - ANSWERmetal containers When an individual receives an electrical shock, an immediate symptom can be _______________. - ANSWERCardiac arrest What happens as protective eye goggles age? - ANSWERTheir resistance to scratching decreases
A resistor with color bands of blue, gray and black has a value of _______________. - ANSWER68 ohms 20% A/an _____________ allows current to flow easily. - ANSWERconductor A/an _________________ stops the flow of current. - ANSWERinsulator A component whose value is measured in microfarads is a: - ANSWERcapacitor A component whose value is measured in ohms is a: - ANSWERresistor Switches are rated in maximum ___________ and ______________. (1) - ANSWERcurrent, voltage (1) Fuses are rated in maximum _____________ and ______________. - ANSWERcurrent, voltage In an electrical circuit where the voltage and resistance are known, which form of Ohm's law is used to find the circuit current? - ANSWERI = E/R A unit of energy is the: - ANSWERJoule Which of the following is commonly used to measure electrical energy consumption? - ANSWERKilowatt-Hours
The current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance. This is a statement of: - ANSWEROhm's Law Ohm's Law states that voltage is the product of resistance and current. Using algebra, how would you determine the resistance? - ANSWERdivide the voltage by the current Watt's law states that power is the product of current and voltage. Using algebra, how could the power be determined if resistance and current are known? - ANSWERcurrent squared times the resistance What does the M+ key on a calculator do? - ANSWERsums the quantity on screen to memory The basic unit of length in the metric system is the ___________. - ANSWERmeter A 120,000 Ohm resistor can be entered into a calculator using scientific notation as ____________. - ANSWER1.2 x 10^ Which symbol is used for Ohms of resistance? - ANSWEROmega Which symbol means "a change of"? - ANSWERTriangle Which metric prefix would be used to represent 1 x 10^6? - ANSWERMega
A decrease in the current of a series circuit can be caused by a: - ANSWERresistance increase When the resistance of a series circuit decreases, ________________________. - ANSWERtotal current increases If a series circuit has a current of about 15.4 mA and a source voltage of 20 V, the total resistance is approximately ____________________. - ANSWER 1300 ohms If a series circuit has two 13 kΩ resistors with a source voltage of 10 V, the wattage is _________. - ANSWER3.85 mW Kirchoff's voltage law (KVL) states that the total voltage around a closed loop must be zero. (3) - ANSWERTrue (3) When resistors are added in parallel to a parallel circuit, total current ________________. - ANSWERIncreases In a parallel circuit, total resistance _______________. - ANSWERis less than the resistance of any branch In a simple parallel circuit, the voltage across each branch is ________________. - ANSWERequal to the source voltage With three 4.5 kΩ resistors and one 1.5 kΩ resistor in parallel, the total resistance is __________. - ANSWER750 ohms
Kirchhoff's first law is also know as the principle of conservation of electric charge. It states that at any point, the sum of currents flowing towards that point is equal to the sum of currents flowing away from that point. - ANSWERTrue (4) The total current in a series-parallel circuit equals the _____________. - ANSWERapplied voltage divided by the total resistance When two 10 kΩ parallel resistors are connected in series with a third 10 kΩ resistor, total resistance (RT) is ____________. - ANSWER15 kiloohms With 70 volts applied to two 30 kΩ resistors in series connected to three30 kΩ resistors in parallel forming a series-parallel circuit, what is the total current?
- ANSWER1 mA If a short occurs in the parallel portion of a series-parallel circuit, how will the total resistance be affected? - ANSWERIt will decrease Thevenin's Theorem states that it is possible to simplify any circuit containing any amount of voltage sources, current sources or resistances, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load. (5) - ANSWERTrue (5) Battery cells are connected in parallel to ________________. - ANSWERincrease current capacity
