# 2A672 Pre-test Edit Code 06

126 Questions | Attempts: 611  Settings  • 1.
(001) What is the simplest form of matter?
• A.

Element

• B.

Mixture

• C.

Electrons

• D.

Compund

• 2.
(001) In an atom, what electrons contain the most energy?
• A.

The energy is shared equally by all electrons

• B.

Orbiting electrons

• C.

Valence electrons

• D.

K shell electrons

• 3.
(001) If there are eight electrons in the outer most shell of an atom, then it is considered
• A.

Complete

• B.

Unstable

• C.

Charged

• D.

Stable

• 4.
(001) Atoms having more than four electrons, but less than eight are known as
• A.

Insulators

• B.

Conductors

• C.

Stable atoms

• D.

Semiconductors

• 5.
(001) The electrostatic fields around a positive ion move
• A.

Inward

• B.

Outward

• C.

Inward, then outward

• D.

Outward, then inward

• 6.
(001) The force required to move free electrons through a conductor is known as
• A.

Current

• B.

Voltage

• C.

Negative charge

• D.

Electrostatic force

• 7.
(002) What are factors that affect the resistance of a material?
• A.

Area, weight, and state of material.

• B.

Area, temperature, and type of material.

• C.

Temperature, weight, and state of material.

• D.

Temperature, type of material, and state of material.

• 8.
(002) What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?
• A.

40 ohms

• B.

20 ohms

• C.

10 ohms

• D.

0.5 ohms

• 9.
002) In a series-parallel circuit, find RT (total resistance) if series resistor R1 = 7 ohms, and parallel resistors R2 and R3 = 8 ohms.
• A.

23 ohms

• B.

15 ohms

• C.

11 ohms

• D.

8 ohms

• 10.
(002) In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed. Use Ohm’s law to find the value of I3 and IT.
• A.

I3 = 5 amps and IT = 14 amps.

• B.

I3 = 4 amps and IT = 9 amps.

• C.

I3 = 4 amps and IT = 18 amps.

• D.

Not enough information to solve.

• 11.
(002) In a series-parallel circuit, total voltage is 12 volts, the value of E1 in the series portion of the circuit is unknown. There are two parallel branches (E2 = 3 volts) and the value of E3 in the second parallel branch is unknown. Using Ohm’s law, find the value of E1 and E3.
• A.

E3 = 9 volts and E1 = 12 volts.

• B.

E3 = 9 volts and E1 = 3 volts.

• C.

E3 = 3 volts and E1 = 6 volts.

• D.

E3 = 3 volts and E1 = 9 volts.

• 12.
(002) What is the difference between an open and a short?
• A.

An open causes resistance to decrease; a short causes resistance to increase.

• B.

Excessive current flow in an open circuit; no current flow in a shorted component.

• C.

No current flow in an open circuit; excessive current flow in a shorted component.

• D.

Minimum voltage development across the open component; maximum voltage development across the shorted component.

• 13.
(003) When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as
• A.

Magnetism

• B.

Reluctance

• C.

Direct current

• D.

Electromagnetic induction

• 14.
(003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?
• A.

Current is zero when voltage is zero; voltage is maximum when current is maximum.

• B.

Current is maximum when voltage is zero; voltage is maximum when current is zero.

• C.

If current decreases, voltage aids the decrease.

• D.

If current increases, voltage aids the increase.

• 15.
(004) What is the basic principle of operation for transformers?
• A.

Mutual induction

• B.

Magnetic induction

• C.

Counterelectromotive force

• D.

Primary and secondary induction

• 16.
(004) What transformer winding acts as a conductor and provides the path into which the voltage is induced?
• A.

Field

• B.

Primary

• C.

Secondary

• D.

Stationary

• 17.
(005) If the size of the plates of a capacitor is increased, how is capacitance affected?
• A.

Capacitance increases.

• B.

Capacitance decreases.

• C.

Electrons are distorted and scattered.

• D.

Electrostatic force between the plates decreases.

• 18.
(005) What statement best describes a capacitive circuit?
• A.

Current leads applied voltage by 90 degrees.

• B.

Applied voltage leads current by 90 degrees.

• C.

Has the ability to conduct in one direction and not the other.

• D.

Has the ability to conduct in all directions when gated or discharged.

• 19.
(005) In what type of circuit(s) does a capacitor oppose any change in voltage?
• A.

Alternating current (AC) and direct current (DC).

• B.

Pulsating DC

• C.

Pure DC

• D.

AC

• 20.
(006) What statement best describes a diode?
• A.

Is a five-terminal device.

• B.

Is a three-terminal device.

• C.

Has the ability to conduct in one direction and not the other.

• D.

Has the ability to conduct in all directions when gated or discharged.

• 21.
(006) What are the minority carriers in P-type material?
• A.

Holes

• B.

Protons

• C.

Neutrons

• D.

Electrons

• 22.
(007) The area of a semiconductor where P-type material is joined to N-type material is known as
• A.

Dielectric region.

• B.

Depletion region.

• C.

Depletion field.

• D.

PN region

• 23.
(007) A junction diode has how many PN junction(s)?
• A.

1

• B.

2

• C.

3

• D.

4

• 24.
(007) If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is
• A.

Not allowing current to flow

• B.

Forward biased

• C.

Reverse biased

• D.

Turned on

• 25.
(008) In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)?
• A.

4

• B.

3

• C.

2

• D.

1

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