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Chpt Be 40-47 > 40 > Flashcards

40 Flashcards

Electronic

1
Q

an electrical conductor is an element with blank electrons on its power orbit

A

less than 4

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2
Q

carbon and silicon are examples of blank

A

semiconductors

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3
Q

which unit of electricity does the work in a circuit

A

ampere

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4
Q

as temperatures increases

A

the resistance of the conductor increases

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5
Q

technician a says that a two wire variable resistor is called a rheostat technician b says that a three wire variable resistor is called a potentiometer

A

both

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6
Q

creating electricity by exerting force on a crystal is used in which type of sensor

A

knock sensor

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7
Q

a potentiometer a

three wired variable resistance is used in which type of sensor

A

throttle sensor

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8
Q

if a insulated wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle the type of failure would be called a

A

short to ground

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9
Q

if two insulated wires were to melt together where the copper conductors touched each other the type of failure would be

A

short to voltage

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10
Q

if 12 volts are being applied to a resistance of 3ohms blank amperes will flow

A

4 amps

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11
Q

how many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied

A

14.4

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12
Q

how many watts are consumed by a starter motor if it draws 150 amperes at 10 volts

A

1500 watts

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13
Q

high resistance on an electrical circuit can cause

A

all of these
dim light
slow motor operation
clicking of relays

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14
Q

if the voltage increases in a circuit what happens to the current (amperes) if the resistance remains the same

A

increases

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15
Q

if 200 amperes flow from the positive terminal of a battery and operate the starter motor how many amps will flow back to the negative terminal of the battery

A

200 amperes

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16
Q

what is the symbol for the voltage used in calculations

A

E

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17
Q

which circuit failure is most likely to cause the fuse to blow

A

short to ground

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18
Q

the amperage in a series circuit is

A

the same everywhere in the circuit

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19
Q

the sum of the voltage drop in a series circuit equals the

A

source voltage

20
Q

if the resistance and the voltage are known what is the formula for finding the current amperes

A

I=E/R

21
Q

a series circuit has three resistors of 4 ohms each the voltage drop across each resistor is 4 volts technician A says that the source voltage is 12 volts technician B says that the total resistance is 18 ohms which technician is correct

A

A only

22
Q

if a12 volt battery is connected to a series circuit with three resistors of 2 ohms 4 ohms and 6 ohms how much current will flow thru the circuit

A

1 amp

23
Q

a series circuit has 10 ohm a third bulb is added in series technician A says that the three bulbs will be dimmer than when only two bulbs were in the circuit technician B says that the current in the circuit will increase which technician is correct

A

A only

24
Q

technician A says that the sum of the voltage drops in a series circuit should equal the source voltage technician B says that the current (amperes) varies depending on the value of the resistance in a series circuit which technician is correct

A

A only

25
Q

two bulbs are connected in parallel to a12 volt battery one bulb has a resistance of 6 ohms and the other bulb has a resistance of 2 ohms technician A says that only the 2 ohm bulb with the least resistance and no current will flow thru the 6 ohm bulb technician B says that the 6 ohm bulb will be dimmer than the 2 ohm bulb which technician is correct

A

B only

26
Q

calculate the total resistance and current in a parallel circuit with the three resistors of 4 8 16 ohms using any of the five methods

A

2.3 ohms (5.3 amperes)

27
Q

inductive ammeters work because of what principle

A

a magnetic field surrounds any wire carring a current

28
Q

a voltmeter should be connected to the circuit being tested

A

in parallel

29
Q

an ohmmeter should be connected to the circuit or component being tested

A

only when no power is flowing (electrically open circuit)

30
Q

a high impedance meter

A

has a high internal resistance

31
Q

a meter is set to read DC volts on the 4 volts scale the meter leads are connected at a12 volt battery the display will read

A

OL

32
Q

what could happen if the meter leads were connected to the positive and negative terminals of the battery while the meter and leads were set to read amperes

A

could blow am internal fuse or damage the meter

33
Q

the highest amount of resistance that can be read by the meter set to the 2k ohm scale is

A

2000 ohms

34
Q

if a digital meter face shows 0.93 when set to read k ohm the reading means

A

930 ohms

35
Q

a reading of 432 shows on the face of the meter set to the millivolt scale the reading means

A

0.432 volt

36
Q

technician A says that magnetic lines of force can be seen by placing iron filings on a piece of paper and then holding them over a magnet technician B says that the effects of magnetic lines of force can be seen using a compass which technician correct

A

both

37
Q

unlike magnetic poles blank and like magnetic poles blank

A

attract repel

38
Q

the conventional theory for current flow is being used to determine the direction of magnetic lines of force technician A says that the left hand rule shoulder be used technician B says that the right hand rule should be used which technician is correct

A

technician B

39
Q

technician A says that a relay is a electromagnetic switch technician B says that a solenoid uses as movable core which technician correct

A

both

40
Q

two technicians are discussing electromagnetic induction technician A says that there induced voltage can be increased if the speed is increased between the conductor and the magnetic lines of force technician B says that the induced voltage can be increased by increasing the strength of the magnetic field which technician is correct

A

both

41
Q

an ignition coil is a example of

A

step up transformer

42
Q

an ignition coil operates using the principle(s) of

A

all of the above
electromagnetic induction
self induction
mutual induction

43
Q

electromagnetic interference can be reduced by using a

A

all of the above
resistance
capacitor
coil

44
Q

a magnetic field strength is measured in

A

ampere-turns

45
Q

two technicians are discussing ignition coils technician A says that some ignition coils have a primary and secondary windings electrically connected technician B says that some coils have totally separate primary and secondary windings that are not electrically connected

A

both

Chpt Be 40-47 (1 decks)

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