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# Electronics Information Practice Problems for McGraw-Hill's ASVAB

By McGraw-Hill Professional
Updated on Jun 26, 2011

The study guide for this quiz can be found at:

Electronics Information Study Guide for McGraw-Hill's ASVAB

1. Alternating current is so called because
1. it is an alternative to direct current.
2. it alters the magnetic field.
3. resistance alternates many times per second.
4. the current changes direction many times per second.
2. An electric current is
1. a form of energy.
2. a flow of electrons.
3. the ability to do work.
4. both A and B.
3. A battery
1. always produces direct current.
2. may produce alternating current.
3. converts electric energy into chemical energy.
4. must have a liquid electrolyte.
4. In a series circuit, total voltage drop equals
1. the drop produced by the biggest resistance in the circuit.
2. the sum of the individual voltage drops.
3. one-half the total individual voltage drops.
4. the inverse of the largest individual voltage drop.
5. A volt is a unit of electric(al)
1. current.
2. resistance.
3. pressure.
4. capacitance.
6. If a 120-volt current is running through a circuit with a resistance of 6 Ω, what is the current strength in amperes?
1. 15 A
2. 20 A
3. 30 A
4. 60 A
7. The transformer depends on the relationship between electricity and
1. voltage.
2. amperage.
3. chemical energy.
4. magnetism.
8. In an electric motor, magnets
1. repel each other.
2. attract each other.
3. cancel each other.
4. amplify each other.
9. A circuit without resistance is called
1. an open circuit.
2. a short circuit.
3. a closed circuit.
4. a hot circuit.
10. A transformer changes the ______ in a circuit.
1. resistance
2. current
3. voltage
4. both B and C
11. In a series circuit, a switch controls
1. all devices on the circuit.
2. only devices with a positive charge.
3. only devices with a negative charge.
4. voltage, but not current.
12. Which is the same at all points in a parallel circuit?
1. Voltage
2. Resistance
3. Current
4. Ohms
13. A switch in a series-parallel circuit controls
1. all devices.
2. some or all devices.
3. only electronic devices.
4. only non-electronic devices.
14. The purpose of dopant in a semiconductor is to make it act as a(n)
1. insulator.
2. resistor.
3. conductor.
4. A or C.
15. In a parallel circuit, what is the total resistance if the individual resistances are 3 and 12 ?
1. 5/12 Ω
2. 12/5 Ω
3. 12 Ω
4. 5 Ω

1. D.The polarity, or direction of electron flow, alternates in AC. Choice B is something that happens with alternating current, but this is not the reason for the name.
2. D.Electricity is a form of energy, and a current is defined as a flow of electrons.
3. A.Batteries always produce direct current (DC).
4. B.Total voltage drop is the sum of the individual voltage drops.
5. C.Electrical pressure is what "pushes" current through a circuit.
6. B.Amperes = volts/ohms = 120/6 = 20.
7. D.When electricity goes through a coil of wire in a transformer, it creates a magnetic field. When this field interacts with another coil of wire, it induces an electric current.
8. A.Electric motors are based on magnetic repulsion.
9. B.A short circuit has no resistance.
10. D.A transformer changes both current and voltage.
11. A.A series circuit has only one pathway, so when switch is open, the whole circuit shuts down.
12. A.Voltage is the same at all points of a parallel circuit.
13. B.A switch in a series-parallel circuit can control some or all devices, depending on the way it's wired.
14. D.Dopants control the electrical properties of a semiconductor.
15. B.1/Rtotal = 1/R1 + 1/R2 + 1/R3 = 1/3 = 1/12 = 5/12. Solve for Rtotal to get 12/5 ohms.

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