# 2A672 Volume 1 Ure Questions

84 Questions | Total Attempts: 2295  Settings  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.

• B.

• 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. Back to top