Electronics Final

Inductive ammeters work because of what principle?

A magnetic field surrounds any wire carrying current.

A box drawn with dashed lines in a wiring diagram indicates __________.

A portion of a component

This drawing is a representation of _________.

A relay

On a wiring diagram, S110 with a ".8 BRN/BLK" means _______.

A splice of a brown with a black stripe, wire size being 0.8 square millimeters (18 gauge AWG)

A short circuit can be located using a __________.

All of the above (Gauss gauge, Test light, Tone generator)

An electrical load ______.

All of these (Has electrical resistance, May be unwanted resistance caused by corrosion, May be an electrical device)

The ability to measure AC current is useful when diagnosing ________.

Alternator function

Magnetic field strength is measured in __________.

Ampere-turns

Which of these is the term used for electrical power?

Amps

Which unit of electricity does the work in the circuit?

Amps

When measuring resistance, a reading of OL on the DMM indicates ______.

An open circuit

High resistance in a circuit can cause ________.

Any of the above (Dim lights, Clicking of relays or solenoids, Slow motor operation)

Unlike magnetic poles ____________ and like magnetic poles _________.

Attract; repel

Magnetic lines of flux flow very easily though objects with high reluctance.

False

The symbol in the figure below indicates which of these?

Ground

What is the symbol for voltage used in calculations?

I (intensity)

If the resistance and the voltage are known, what is the formula for finding the current (amperes)?

I = ExR

If the voltage increases in a circuit, what happens to the current (amperes) if the resistance stays the same?

Increases

The total circuit resistance of a parallel circuit is always _______ the lowest resistance present in any branch of the circuit.

Less than

An electrical conductor is an element with ______ electrons in its outer orbit.

Less than 4

Which device illuminates a different color when connected to power or ground sides of a circuit.

Logic probe

Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path?

Magnetic induction

If resistance is reduced in a series circuit, _______ current will flow.

More

An ignition coil is an example of a __________.

Step up transformer

Tech A says: that magnets are used in some crankshaft position. Tech B says: magnets are used in potentiometers. Which technician is correct?

Tech A

As temperature increases, __________.

The resistance of the conductor increases

The amperage in a series circuit is ______?

The same anywhere in the circuit

A potentiometer, a three-wire variable resistor, is used in which type of sensor?

Throttle position (TPS)

A loose or broken ground wire can cause more than one component to malfunction.

True

If one branch of a parallel circuit loses continuity, the other branches will still each receive source voltage and ground.

True

A rheostat usually has how many wires?

Two

Where is connector C250 located?

Under the dash

The __________ is a unit of electrical pressure.

Volts

This symbol in a wiring diagram indicates (----->>-------)

A connector

In an open circuit ________

Both A & B (No voltage is present, No current will flow)

When testing a relay using an ohmmeter, which two terminals should be touched to measure the coil resistance?

86 and 85

If a digital meter face shows 0.93 when set to kilo-ohms, the reading means ______.

930 ohms

It requires _________ volts to push push 1 amp through 1 ohm of resistance.

1

If a 12-volt battery is connected to a series circuit with three resistors of 2 ohms, 4 ohms, and 6 ohms, how much current will flow through the circuit?

1 amp

How much current will flow in this circuit? (3 ohms, 2 ohms, 1 ohm and 12 volts)

6 amps

What is the total resistance in this circuit? (3 ohms, 2 ohms, 1 ohm)

6 ohms

To prevent blowing the meter fuse in a DMM ______

Both A & B (Install a fuse in line with the meter lead, and Never test resistance of an energized circuit)

A circuit with excessive current flow __________.

Both A & B (May create excess heat in conductors, May cause a fuse to blow)

Tech A says: that a relay is an electromagnetic switch. Tech B says: that a solenoid uses a movable core. Which is correct?

Both are correct

Tech A says: that some ignition coils have the primary and secondary windings electrically connected. Tech B says: that some coils have totally separate primary and secondary windings that are not electrically connected. Which tech is correct?

Both techs are correct

When discussing induced voltage caused by a magnetic field moving across a complete circuit, Tech A says: that the direction of current flow depends on the direction of movement of flux lines. Tech B says: that the direction of current flow is called polarity. Which tech is correct?

Both techs are correct

When working on a hybrid vehicle, which type of meter is recommended?

CAT III or CAT IV

When using a DMM, the black lead usually goes in which port?

COM

Most carbon resistors indicate their electrical resistance by

Color coded markings

A complete circuit that is continuous from source through loads and back to ground has ________.

Continuity

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 amps?

Could blow an internal fuse or damage the meter

What term describes the movement of electron from one atom to another?

Electricity

A meter is set to read DC volts on the 4-volt scale. The meter leads are connected at a 12-volt battery. The display will read ________.

OL

High resistance in a circuit _________.

Reduces current flow through the circuit

Like charges ______.

Repel

If an 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 call a _______.

Short to ground

Which circuit failure is most likely to cause a fuse to blow?

Short to ground

All switches illustrated in schematics are _______.

Shown in their normal position

Which of these uses a movable core to act as an electric switch?

Solenoid

The vehicle has four parking lights all connected in parallel and one of the bulbs burns out. Tech A says: that this could cause the parking light fuse to blow (open) Tech B says: that it would decreases the current in the circuit Which tech is correct?

Tech B only