Chapter 51 Test Electrical Components and Wiring.

Diodes have...... PN junction(s)

A - A single

To help protect wires and keep them organized wires..............

A - Are bundled together in a wiring harness.

The number of charge carries, either an excess of ..... or a deficiency of electrons (causing holes in a material), can be altered by doping, or adding very small quantities of impurities to a semiconductor material.

A - Electrons

A compass is used to

A - Show that when energized, the relay winding produces a magnetic field.

Two technicians are discussing transistors. Technician A says that the two main types of transistors are PNP and NPN. Technician B says they are PTC and NTC. Who is correct?

A - Technician A is correct.

One function of a diode is to:

A - allow current flow in one direction

Resistance measurements are used to check........................against the manufactures specifications for example, the resistance of sensors.

A - components

Electronic delay circuits are used to:

A - delay turning off devices

When the capacitor is charge,

A - one surface is positively charged and the other is negatively charged.

The most effective and safest tool to use to strip insulation from electrical wire is a

A - set of wire stripers.

Tech A says quartz crystals under mechanical stress will produce a voltage. Tech B says the piezoelectric principle is used in coolant temp sensors. Who is correct?

A - tech a is correct.

Technician A says you should use a rosin core solder when repairing electrical circuits. Technician B says you should not overheat the repair area. Who is correct?

A - technician A is correct.

Thermistors:

A - vary their resistance in response to temperature change.

Be careful of the chart you use, because many of them allow up to a ....... voltage drop over the length of wire, which isomer than is allowed in most automotive circuits.

B - 0.1

Most high wattage resistors that can carry large amperage contain coil of high-resistance wire wound around a ............ form to dissipate heat

B - Ceramic

In developing engine designs, manufactures use thermocouples to measure the .... of components, such as spark plugs and exhaust systems

B - High temperatures.

If an ......... control switch is connected to the base, the depletion layer at one PN junction will ......... through the transistor.

B - Open; block current from flowing.

Solder-less terminals are.......... to install and .......... at conducting electricity across joints that are designed to be disconnected.

B - Quick; effective

It is important to understand that the ....... of the series voltage drops equals the supply voltage as explained in kirchoffs voltage law.

B - Sum

Coloring a wire orange means that it is

B - Switched to power

Potentiometers are mechanical variable resistors with...... connections, .......

B - Three; two fixed and one moveable.

Which of the following is not a component of a controlled area network bus (can-bus)?

B - internet connection

Tech A says wire size is very important. Tech B says there are two scales used to measure wire size. Who is correct?

C - Both A and B are correct.

Which scale is used to measure the sizes of wires?

C - Both A and B are correct.

Two technicians are discussing solder wire repair. Technician A says that electrical tape can be used to cover the joint. Technician B says that heat shrink tubing can be used to cover the joint. Who is correct?

C - Both A and B are correct..

Technician A says that when installing a crammed terminal to an electrical wire, the stripped wire should protrude slightly beyond the crimp portion of the terminal. Technician B says cooler coded terminals indicate which anvil to crimp the terminal with. Who is correct?

C - Both technicians are correct.

Tech A says you should never strip wires with a knife or other sharp tool. Tech B says its ok to repair wires with solder less connectors if done properly. Who is correct?

C - Both techs A and B are correct.

A variable resistor

C - Has a movable arm that swipes across a coil that has less resistance at one end and more at the other.

A semiconductors electrical resistance is....... than that of most conductors, but..... than that of most insulators.

C - Higher; Lower.

........ solder is used on electrical connections because it is much ........... likely to corrode the metals than ..........

C - Rosin flux; less; acid flux.

Tech A says a modern automobile has more than 1 mile of wiring. Tech B says there are around 1,000 individual wires. Who is correct?

C - both techs are correct.

An application of Zener diodes in vehicles is the:

C - voltage regulator.

Technician A says you should never strip wires with a knife or other sharp tool. Technician B says, though not preferred repairing wires with solder less connectors is acceptable, if done properly. Who is correct?

C. Both Techs A and B

Wiring diagrams contain large amounts of information in the form of

D - Both A and B

The correct wire size for an application can be looked up on a wire size chart if you know the

D - Both A and C Amperage of circuit. Length of wire.

The outer region of a transistor is the

D - Both B and C

Coloring a wire blue means that it is.....

D - Variable.

When soldering wiring, always use an

D - both A and B Rosin. Rosin-core solder.

To identify their value, many resistors are marked with ....... colored bands.

D - four or five.

Two technicians are discussing wire repair. Technician A says that when soldering, the hotter the end the better, as it causes the solder to wick up the wires. Technician B says that the stripped ends of wires to be solved should be laid parallel to each other to minimize resistance of the joint. Who is correct?

D- Neither technician is correct.