2A672 Volume 1 Quiz
Unit Review Questions from CDC 2A672 Volume 1
- 1.What is the simplest form of matter?
- A.
Element
- B.
Mixture
- C.
Electrons
- D.
Compound
- 2.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.Atoms having more than four electrons, but less than eight are known as
- A.
Insulators
- B.
Conductors
- C.
Stable atoms
- D.
Semiconductors
- 4.The electrostatic fields around a positive ion move
- A.
Inward
- B.
Outward
- C.
Inward, then outward
- D.
Outward, then inward
- 5.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
- 6.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
- 7.Convert 500 milliamps to standard amperage.
- A.
.005 amps
- B.
.05 amps
- C.
.5 amps
- D.
50 amps
- 8.In a series-parallel circuit, find RT 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
- 9.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 Ohms'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
- 10.What is the difference between and 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
- 11.Voltage induced into a conductor by the expanding and collapsing of a magnetic field is
- A.
Magnetism
- B.
Reluctance
- C.
Direct current
- D.
Electromagnetic induction
- 12.In an inductor, what happens to the magnetic lines of force if the diameter of the core is increased in size?
- A.
Permeability increases
- B.
Magnetic field decreases
- C.
Induction of the coil increases
- D.
Induction of the coil decreases
- 13.What is the basic principle of operation for transformers?
- A.
Mutual induction
- B.
Magnetic induction
- C.
Counterelectromotive force
- D.
Primary and secondary induction
- 14.What type of transformer contains more turns in the primary winding than in the secondary winding?
- A.
Current
- B.
Step up
- C.
Rectifier
- D.
Step down
- 15.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
- 16.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 in the other
- D.
Has the ability to conduct in all directions when gated or discharged
- 17.How many electrons does the valance band of an intrinsic semiconductor have?
- A.
3
- B.
4
- C.
5
- D.
6
- 18.What are the minority carriers in P-type material?
- A.
Holes
- B.
Protons
- C.
Neutrons
- D.
Electrons
- 19.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
- 20.A junction diode has how many PN junction(s)?
- A.
1
- B.
2
- C.
3
- D.
4
- 21.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
- 22.If a zener diode is installed in the forward bias mode in a circuit, it acts as a
- A.
Regular diode
- B.
Spike protector
- C.
Voltage reference
- D.
Voltage regulator
- 23.How is a zener diode connected in a circuit to regulate voltage?
- A.
In parallel to the load
- B.
In series with the load
- C.
In parallel to the resistor
- D.
In series with the resistor
- 24.If a schematic diagram doesn't list a reference for the zener diode, the diode is probably being used as a
- A.
Reference
- B.
Normal diode
- C.
Spike protector
- D.
Voltage regulator
- 25.How is the zener diode connected in a circuit to protect the load?
- A.
In parallel to the resistor
- B.
In series with the load
- C.
In parallel to the load
- D.
Forward biased
Questions: 80 | Attempts: 2628 | Last updated: Jun 13, 2018
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