2A672 Pre-test Edit Code 06
- 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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