The Associate CET Study Guide

B+, or supply voltages in electronics products, is considered to be:

A. +5 to +12 VDC

B. 0 to 30 V DC

C. +12 to 300 V DC

D. The anode or plate voltage supply

D. The anode or plate voltage supply

Leakage current in an electronic product, between either of the AC power cord conductors and the chassis or any exposed metals should not exceed _________.

A. 5 microamps

B. 500 microamps

C. 5 milliamps

D. 50 milliamps

B. 500 microamps

Shaded components on the electronics schematics mean:

A. Only factory service personnel may change the part

B. Only exact replacement parts may be used

C. The shading makes for better readability

D. High voltage is present on these parts

B. Only exact replacement parts may be used

Ingested solder fumes when particles _______.

A. I'm not harmful to the human body

B. Are toxic

C. From lead-tin solder aren't harmful

D. From tin-alloys are most harmful

B. Are toxic

Second degree skin burns should ________.

A. Not be treated with ice and bandage pack

B. Be covered with thick bandages

C. Be treated with cold water or ice

D. Be treated by draining blisters

A. Not be treated with ice and bandage pack

Rules describing the fire or toxicity retardant types of cabling which may be installed in buildings is contained in _________.

A. NEC Article 770

B. UL 569B

C. TIA/EIA standard 578

D. NEMA code 1316

A. NEC Article 770

ESD and static discharge is most destructive to _______.

A. CMOS semiconductors

B. TTL semiconductors

C. Germanium PN junctions

D. Silicon PN junctions

A. CMOS semiconductors

If you have never receive formal training and practice CPR want a pricing or dummy, in the event of finding a fellow worker not breathing, you _________.

A. Should use what knowledge you do half of the procedure and attempt it

B. Should not attempt it, but call for help

C. Should attempt it after calling for help

D. Should, if handy, read the instructions and attempt in order to save the life

B. Should not attempt it, but call for help

When working at heights above 6 feet, a ________ is required by OSHA rules.

A. Linesman's belt

B. Linesman's belt attached to a lanyard

C. Full body harness attached to a lanyard that prevents more than a 6 foot drop

D. Good insurance policy

C. Full body harness attached to a lanyard that prevents more than a 6 foot drop

'Phantom' current is associated with ________.

A. Northern Lights

B. Corona arcing from electrical generators

C. Charge retained by inductors

D. Charge retained by capacitors

D. Charge retained by capacitors

The atomic number of an element is the same as the element's atomic weight.

A. True

B. False

B. False

An increase in the voltage with resistance held constant causes current to __________.

A. Decrease

B. Increase twice to value of voltage

C. Increase

D. None of the above

C. Increase

The ampere, expresses __________.

A. Volts/sec increase

B. A unit of charge movement per second past a given point

C. Coulombs/charge

D. An increase in resistance

B. A unit of charge movement per second past a given point

The total resistance of a parallel circuit containing equal branch resistances is found by the following:

A. By adding all of the branch resistance values

B. By taking the product of all the branch resistance values

C. By dividing the resistance value of a branch by the number of branches

D. The value cannot be found

C. By dividing the resistance value of a branch by the number of branches

A 12 V DC power supply has a 15 ohm internal resistance. What load resistance can you be connected to transfer maximum power?

A. 15 ohms

B. 20 ohms

C. 10 ohms

D. 5 ohms

A. 15 ohms

Maximum power transfer occurs when the low impedance is equal to the source impedance.

A. True

B. False

A. True

What will happen to the current through the resistor if the resistor value increases?

A. Current increases

B. Current remains unchanged

C. Current decreases

D. Car and the voltage across the resistor increases

C. Current decreases

Which type of circuit has the same voltage across each component?

A. Parallel

B. Series-parallel

C. Series

D. Combination

A. Parallel

Total power in a series circuit is determined by the:

A. Source voltage times the current

B. Total voltage applied

to the circuit

C. Current flowing through the switch

D. Average wattage rating of each resistor

A. Source voltage times the current

Which is the equivalent to 100 microamps?

A. .1 milliamps

B. 1 milliamps

C. 10 milliamps

D. 10 Nanoamps

A. .1 milliamps

A resistor __________.

A. Stores an electric charge

B. Is measured in coulombs

C. In a circuit causes a voltage drop from one end to the other

D. Is dependent on lines of force

C. In a circuit causes a voltage drop from one end to the other

1 kΩ is the same as __________.

A. 1 thousand ohms

B. 1 thousandth of an ohm

C. 10−² ohms

D. 10000 ohms

A. 1 thousand ohms

A circuit has one 500 ohm resistor in series with three 500 ohm resistors that are connected in parallel with each other. The total resistance would be ____________.

A. 666 ohms

B. 167.7 ohms

C. 750 ohms

D. 1000 ohms

A. 666 ohms

The voltage rating of a capacitor ___________.

A. Must be factored into the resistance formula

B. Relates to the maximum voltage that should be applied to it

C. Indicates the maximum current the capacitor can allow

D. Is the same as the power factor

B. Relates to the maximum voltage that should be applied to it

Calculating the total capacitance of several capacitors connected in parallel __________.

A. Is not necessary as they are not used this way

B. Causes a need to consider inductance factors

C. Is done by adding each of the capacitance values

D. Is the same as the power factor

C. Is done by adding each of the capacitance values

Ferrite __________.

A. Is a capacitor dielectric

B. Is a common inductor core material

C. Is the most common resistor coating

D. Causes faulty saturation of the inductors

B. Is a common inductor core material

The term Henry refers to __________.

A. The inductive property of a coil

B. The inventor of inductors

C. Reactance of LR circuits

D. Resonant frequency of the tank circuits

A. The inductive property of a coil

A certain transformer has 250 turns in the primary windings and 1250 turns in the secondary winding. The turns ratio is __________.

A. 0.2

B. 2.5

C. 5

D. 0.5

C. 5

When the turns ratio of a transformer is 10 and the primary AC voltage is 8V, the secondary voltage is __________.

A. 80 Volts

B. 0.8 Volts

C. 8 Volts

D. 64 Volts

A. 80 Volts

Which of these color code patterns is found on a 270Ω 5% resistance?

A. Red, violet, brown, silver

B. Red, violet, brown, gold

C. Red, violet, black, silver

D. Red, brown, black, silver

B. Red, violet, brown, gold

One microfarad is equivalent to __________ picofarads.

A. 10

B. 1000

C. 100,000

D. 1,000,000

D. 1,000,000

The capacitance of a capacitor with 10μC of electric charge and 100V across its plates is __________.

A. 0.1μF

B. 10μF

C. 1000μF

D. 10⁷μF

A. 0.1μF

Total impedance in a series circuit is found by:

A. Adding up all the series existence in reactance values

B. Subtracting all the inductive reactance from all the capacitive reactance's and adding the resistors values

C. Finding the net reactance and the net resistance, square each separately, add them together and then find the square root of the sum

D. Divide the applied voltage by the addition of all the circuit components individual currents

C. Finding the net reactance and the net resistance, square each separately, add them together and then find the square root of the sum

In a series AC circuit with a resistor, inductor and capacitor, each with the same resistance of reactance, a voltmeter measuring each individual voltage drop would find:

A. The voltage equal to each other

B. The reactance voltage of the capacitor or the inductor would be greater than the resistance voltage measurement

C. The resistance voltage would be higher than the voltage across the inductor or the capacitor

D. The supply voltage would be measured across the resistor and the voltage across the capacitor and across the inductor would measure 0V

A. The voltage equal to each other

Which if the following is not characteristic of a series circuit?

A. Circuit components have a division of the supply voltage

B. All components share one current

C. Energy is shared by reactive devices

D. There is a different level of current in the reactive components than in the resistive components

D. There is a different level of current in the reactive components than in the resistive components

In an AC circuit, as the applied voltage frequency changes upward, the inductive reactance in the circuit will:

A. Decrease

B. Increase

C. Stay the same

D. Either increase or decrease

A. Decrease

A 50KHz AC voltage is applied to a 10mH inductor, its reactance at this frequency is:

A. 3140 ohms

B. 300 ohms

C. 3100 ohms

D. 500 ohms

A. 3140 ohms

A .1μF capacitor in a circuit with frequency of 100 KHz applied has a reactance of:

A. 1.59 ohms

B. 15.9 ohms

C. 159 ohms

D. 15.9 kohms

B. 15.9 ohms

In a series circuit when the inductive reactances equal the capacitor reactances the circuit has __________ impedance.

A. Maximum

B. Double the inductor's

C. Minimum

D. No

C. Minimum

In a parallel circuit when the inductive reactances equal the capacitor reactances the circuit has __________ impedance.

A. Maximum

B. Double the inductor's

C. Minimum

D. No

A. Maximum

Resonance is when __________.

A. All resistances in an AC circuit are equal to each other

B. All reactances are equal on each reactive component

C. The total of the inductive reactances in the circuit equal the total of all capacitive reactances

D. No current is flowing through an AC circuit when a voltage is applied

C. The total of the inductive reactances in the circuit equal the total of all capacitive reactances

__________ cells are prone to battery memory.

A. Zinc

B. NiCad

C. Alkaline

D. Lithium

B. NiCad

A conducting loop in motion through magnetic lines of flux has a current induced in it. The physical law that explains this is what?

A. Lenz's Law

B. The law of inertia

C. The Compton shift equation

D. Kirchhoff' current law

A. Lenz's Law

An AC generator is also known as a __________.

A. Regulator

B. Alternator

C. Phaser

D. Slip ring

B. Alternator

Three-phase power is obtained from an AC generator by wiring the armature windings in a __________ or __________ configuration.

A. Alpha, beta

B. Treble, tri-phase

C. Polymorph, one-to-three

D. Delta, wye

D. Delta, wye

What element of a DC generator distinguishes it from a AC generator?

A. Slip rings

B. Commutator

C. Series wound field coil

D. Armature

B. Commutator

What type of motor will speed dangerously out of control if not physically load it?

A. Induction motor

B. Shunt wound DC Motor

C. Series wound DC Motor

D. Series wound AC motor

C. Series wound DC Motor

AC motor speed depends on __________.

A. The frequency of the voltage applied to it

B. The voltage level applied

C. The phase of the voltage applied to it

D. The power left in the dilithium

A. The frequency of the voltage applied to it

Series wound AC motors have strong torque from a dead stop. This makes then ideally suited for use in small appliances.

A. True

B. False

A. True

What element of a synchronous AC motor provides startup torque for the motor?

A. Slip rings

B. Salient poles

C. Squirrel cage

D. Armature

C. Squirrel cage

An AC inductive motor requires what to operate?

A. Input power

B. Slip rings

C. Slip

D. Rotor battery

C. Slip

What happens to the value of a capacitor if the spacing between plates decreases?

A. Increases

B. Remains the same

C. Decreases

D. Varies

A. Increases

A variable capacitor's plates can open or close. As the plates open, capacitance:

A. Remains the same

B. Capacitors aren't made this way

C. Decreases

D. Increases

C. Decreases

An inductor with the same length of wire but whose turns are spaced further apart will have:

A. Less inductance

B. More inductance

C. Equal inductance

D. More mural inductance

A. Less inductance

An inductor in an electrical circuit:

A. Causes current to lead voltage

B. Opposes the flow of AC current

C. Appears capacitive to AC current

D. Appears as a short circuit to AC current

B. Opposes the flow of AC current

The term for the combination of resistance and reactance that restricts the flow of alternating current is:

A. Volt-amperes

B. Impedance

C. Susceptance

D. Power factor

B. Impedance

Is the value of a 500 picofarad capacitor and a .5 nanofarad capacitor identical?

A. Yes

B. No

A. Yes

In a generator, a DC voltage applied to the field windings controls the output level.

A. True

B. False

A. True

Which one of the below might be used in DC motor electronic speed controls?

A. Delta coil

B. Magnetic brush

C. Slip rings

D. Comparator op-amp

D. Comparator op-amp

Which one of below will cause a generator to produce DC voltage rather AC voltage?

A. Brushes

B. Armature

C. Commutator

D. Field windings

C. Commutator

Total capacitance of capacitors in parallel is like:

A. Resistors connected in series

B. Capacitors connected in series

C. Resistors connected in parallel

D. Inductors connected in parallel

A. Resistors connected in series

Which factor determine the value of a capacitor?

A. Area of the plates

B. Temperature coefficient of the dielectric

C. Inductance of the dielectric

D. Insulation covering

A. Area of the plates

A 3/8-inch diameter by 3/16-inch ceramic disk capacitor marked "47" is most likely what value?

A. 47 nf

B. 47 uf

C. 47 pf

D. 47 nf

C. 47 pf

What happens to current flow in a capacitor when the DC voltage across it has increased to the applied voltage?

A. Current flow is maximum in capacitor

B. Little current flows

C. Polarity reverses

D. Voltage drop is maximum

B. Little current flows

Decreasing the inductance in a series tuned circuit will cause the resonant frequency to:

A. Increase

B. Decrease

C. There will be no change

D. Become unstable

A. Increase

Which of these is within tolerance for a resistor color coded red, black, red, gold.

A. 1850 ohms

B. 2150 ohms

C. 1950 ohms

D. 2250 ohms

C. 1950 ohms

A high current NP device would most likely be found:

A. In a surge suppressor

B. As the radiator in a micro-wave oven

C. In the DC power supply of a television

D. As the oscillator in a superheterodyne receive

A. In a surge suppressor

Which of these would most likely be used as a signal amplifier?

A. Triode

B. Magnetron

C. Triac

D. DAC

A. Triode

A capacitor and a resistor in series would be used to:

A. Cut off the peaks in AC signals at a set level

B. Reduce or short signals above certain frequencies

C. Pass the DC level, while blocking the AC signals

D. Filter signals from getting into an amplifier

B. Reduce or short signals above certain frequencies

The component used to control the functions of an electronic device most likely would be referred to as:

A. RAM

B. SCR

C. Microprocessor

D. Op-amp

C. Microprocessor

A capacitor would most likely be rated:

A. 5 farads

B. 4 henrys

C. 7 ohms

D. .05 microfarad

D. .05 microfarad

Which of these is most true of a PNP transistor?

A. It will avalanche when the cutoff is reached

B. It conducts equally well forward or backward

C. A negative voltage will be applied to the collector

D. The cathode must be heated to operate

C. A negative voltage will be applied to the collector

An advantage a transistor has over a vacuum tube triode is:

A. A triode cannot conduct from the cathode to the anode

B. A transistor does not require as anode load

C. A triode requires grid bias

D. A transistor normally has a longer life

D. A transistor normally has a longer life

The most likely use of a transformer would be:

A. To couple signals from one circuit to another

B. To filter out unwanted signals

C. As a regulator in power supplies

D. To protect a circuit from excessive currents

A. To couple signals from one circuit to another

Which of these would apply mostly to a "balun"?

A. Semiconductor

B. Isolation transformer

C. Integrated circuit

D. Over voltage protection

B. Isolation transformer

DIP refers to:

A. Double integrated protection

B. Dual ion positron

C. Discrete icon positioner

D. Dual inline package

D. Dual inline package

Diodes are marked with a band at the __________ end.

A. Cathode

B. Anode

C. Center

D. Base element

A. Cathode

In testing a diode, a forward-to-reverse ratio of 10-1 is indicative of a good diode.

A. True

B. False

B. False

To properly bias a NPN transistor which voltages appear correct for a signal amplifier?

A. E=0; B=+.5 C=+10

B. E= 1; B=5; C=+20

C. E=-1; B=-1.7; C=9.3

D. E=0; B=0; C=10

A. E=0; B=+.5 C=+10

To properly bias a PNP transistor which voltages appear proper?

A. E=0; B=+1; C=+10

B. E= 1; B=5; C=+20

C. E=-1; B=-1.7; C=-10

D. E=0; B=0; C=-10

C. E=-1; B=-1.7; C=-10

In a transistor, which section is made very thin compared with the other two?

A. Emitter

B. Base

C. Collector

D. Each are exactly the same

B. Base

Which part of a transistor carries the most current?

A. Emitter

B. Base

C. Collector

D. Each are exactly the same amount

A. Emitter

The primary difference between a NPN and a PNP is:

A. Size

B. DC voltages are reversed

C. One is germanium and the other silicon

D. The polarity of the source voltage

B. DC voltages are reversed

Name one safety precaution taken before replacing a transistor.

A. Remove power

B. Remove transistor

C. Short emitter to base to remove discharge voltage

D. Put on rubber gloves for isolation

A. Remove power

Zener and varactor diodes are usually __________ biased.

A. Reverse, meaning the positive voltage connects to the N material

B. Reverse, meaning the negative voltage connects to the N material

C. Forward, meaning the negative voltage connects to the N material

D. Forward, meaning the positive voltage connects to the N material

A. Reverse, meaning the positive voltage connects to the N material

A BGA chip has __________.

A. Thru hole pins

B. Leads on the sides

C. Solder balls underneath

D. Both gates anodized

C. Solder balls underneath

Troubleshooting discrete circuits involves a knowledge of __________.

A. Circuit function

B. Where product was made

C. How it failed

D. A and C

D. A and C

SMT stands for __________.

A. Slow melting temperature

B. Surface mount technology

C. Sure mounts tough

D. Standard metal thickness

B. Surface mount technology

When replacing a DIP chip, __________.

A. Use ungrounded soldering gun

B. Use an ESD static grounded soldering pencil or work station

C. Use the highest temperature possible to get the job done quickly

D. Use a solder sucker and 250 W gun

B. Use an ESD static grounded soldering pencil or work station

One area where technicians will still find discrete electronic components is __________.

A. RF equipment

B. Mass product video games

C. High density circuit boards

D. Small portable handheld devices

A. RF equipment

What basic circuit parameter makes it difficult to build integrated circuits with a high number of components to operate at super high frequencies?

A. Series resistance

B. Parallel inductance

C. High impedance

D. Shunt capacitance

D. Shunt capacitance

When troubleshooting equipment that is software controlled, __________.

A. Use of a laptop computer my be required

B. AC signals are not used

C. DC voltages are always 5 Volts

D. Diagnostics will be easy

A. Use of a laptop computer my be required

A category 2 type of electronics equipment could be a __________.

A. Consumer home TV

B. Heart monitor

C. Fax machine

D. FM walkman

C. Fax machine

An example of a solid state device is __________.

A. Cermet resistor

B. Tantalum capacitor

C. Silicon diode

D. Vacuum tube

C. Silicon diode

A four layer PN device is classified as a __________.

A. Diode junction

B. Transistor

C. Thyristor

D. Integrated circuit

C. Thyristor

How is a fuse installed in a circuit to insure proper operation?

A. Parallel to the load

B. In series with the load

C. In any way possible

D. At the ground point

B. In series with the load

A negative temperature coefficient thermistor will:

A. Increase in resistance with temperature

B. Decrease in resistance with temperature

C. Have no change in resistance with heat or cold

D. Increase in resistance with higher voltage

B. Decrease in resistance with temperature

A NiMH battery cell, when charged, has a terminal voltage of:

A. 2.1 Volts

B. 1.2 Volts

C. 5.0 Volts

D. 12 Volts

B. 1.2 Volts

A thermocouple has an output in the range of:

A. Millivolts

B. Microvolts

C. Volts

D. Nanovolts

A. Millivolts

Germanium diodes:

A. Have 0.3V forward voltage drop

B. Are more often used in power supply circuits

C. Are more tolerant of heat than silicon diodes

D. Have 0.7V forward voltage drop

A. Have 0.3V forward voltage drop