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Block 4 Study Guide(New)

Total questions: 56

Worksheet time: 28mins

Name
Class
Date
1.

The smallest particle of matter that can exist and still retain its identity is a:

a)

Element

b)

Molecule

c)

Compound

2.

The particles that make up matter are always moving. This is described by:

a)

Atomic motion principle

b)

The kinetic theory

c)

Molecular fusion

3.

Ionization is defined as:

a)

The process by which an atom gains or loses neutrons

b)

The loss or gain of electrons by an atom

c)

The bonding of two different atoms

4.

The outermost electrons are called:

a)

Free electrons

b)

Atomic shells

c)

Energy bands

5.

Electrons at rest are:

a)

Bound charge

b)

Neutral particles

c)

Static

6.

Electrons in motion are:

a)

Moving charges

b)

Dynamic

c)

Atomic flow

7.

A field of force around a charged body is called:

a)

Electrostatic field

b)

Electric impulse

c)

Magnetic resistance

8.

Parts that are ESD sensitive are typically shipped in:

a)

Insulated plastic containers

b)

Specially designed bags

c)

Anti-shock foam boxes

9.

The measure of opposition to the lines of force is known as:

a)
magnetic reluctance
b)
magnetic flux
c)
magnetic permeability
10.

The magnetic field around a conductor will increase with:

a)

Greater current flow

b)

Increasing resistance

c)

Reducing voltage

11.

Electrons in motion are known as:

a)

Moving charges

b)

Current or Current Flow

c)

Electrical particles

12.

Conductors offer ______ resistance to current flow.

a)

Moderate

b)
Low
c)

Variable

13.

Insulators offer ________ resistance to current flow.

a)
High
b)

Negligible

c)

Intermittent

14.

If the area of a conductor is doubled, its resistance will:

a)

Increase exponentially

b)

Be reduced by half

c)

Remain unchanged

15.

A variable resistor with 3 terminals that varies voltage is known as a _______.

a)

Transformer

b)

current

c)
Potentiometer
16.

A resistor used to vary current is called a:

a)

Fixed resistor

b)

Rheostat

c)

Circuit limiter

17.

A circuit in which the same voltage source is applied across two or more resistances or loads is called:

a)

Open circuit

b)

Parallel

c)

Series connection

18.

How does Alternating Current change voltage when transmitted over long distances?

a)

Voltage equalizers

b)

Rectifier circuits

c)

Transformers

19.

When a bar magnet is moved through a coil of wire, a voltage is induced and can be measured with a voltmeter. This is known as:

a)

Electrical flux

b)

Faraday’s Law

c)

Ohm’s principle

20.

The ratio of true power to apparent power is called:

a)

Power factor

b)

Efficiency rating

c)

Load coefficient

21.

What device consists of two coils that are not electrically connected but are arranged so that the magnetic field surrounding one coil cuts through the other coil?

a)

Electromagnet

b)

Transformer

c)

Motor winding

22.

If a transformer steps up the voltage, it steps down the current by the same ratio. What happens to power?

a)

Power is lost as heat

b)

Power efficiency increases

c)

Power will remain the same

23.

In a DC generator, what causes the current to flow always in the same direction through the external circuit?

a)

Rotating stator

b)

Commutator action

c)

Magnetic flux stabilizer

24.

When resistors are connected in parallel, the total resistance of the circuit will _______

a)
increase
b)
remain the same
c)
fluctuate
d)
decrease
25.

The function of the ohmmeter is to measure

a)
Current
b)
Voltage
c)
Power
d)
Resistance
26.

If a transformer steps up the voltage, it steps down the current by the same ratio, what happens to power?

a)
Power is halved when voltage is stepped up
b)

Power remains the same

c)
Power decreases with current
d)
Power increases with voltage
27.

An open circuit represents ____ resistance.

a)

infinitely large

b)

medium amount of

c)

low

28.

A short circuit usually creates ______ current flow.

a)
reduced
b)

high

c)
normal
d)
minimal
29.

When reading amperage in a circuit, the meter should be connected in _______ with load.

a)

parallel

b)

relation

c)
series
30.

How can you charge a dry cell battery

a)
Place the battery in direct sunlight to charge it.
b)
Use a car battery to charge the dry cell battery.
c)
Connect the battery to a standard wall outlet.
d)

The charge of battery is not reversible

31.

Battery life cycle is defined as

a)
the physical size of a battery
b)

the process of charging/discharging cylces

c)
the amount of energy a battery can store
32.

The state of charge of a lead-acid is indicated by

a)
Battery age
b)
Temperature measurement
c)

Specific gravity or density of electrolyte with hydrometer

d)
Current draw measurement
33.

Which battery uses potassium hydroxide as an electrolyte?

a)
Lead-acid battery
b)
Lithium-ion battery
c)
Nickel-cadmium battery
34.

To check the electrolyte level in a Ni-Cad battery

a)

Use Hydrometer

b)
Store the battery in a cool place to maintain electrolyte levels.
c)

Fully charge battery then check fluid level

35.

This type of battery has replaced Ni-Cad batteries due to it's "memory effect"

a)
Lead-Acid batteries
b)
Nickel-Metal Hydride batteries
c)
Alkaline batteries
d)

Sealed Lead-Acid

36.

Which describes a direct short in an electrical circuit?

a)

Where full system voltage comes in contact with the ground or return side of the circuit

b)
A direct short is a type of fuse that limits current flow.
c)
A direct short is a normal operating condition in a circuit.
d)
A direct short is a high-resistance connection that prevents current flow.
37.

The schematic symbol for a current limiter?

a)
A circle with a resistor inside
b)

A SPST Switch

c)

The same as that for a fuse

38.

What type of switch has an LED bulb to illustrate function?

a)

microswitch

b)

lighted push button switch

c)

rotary switch

39.

The amount of EMF(Electromotive Force) is depended on:

a)
The resistance of the circuit
b)

number of wires , strength of magnetic field, speed of rotation.

c)
The color of the wire
d)
The temperature of the coil
40.

The relationship between voltage and current in a AC circuit is known as:

a)
Capacitance
b)

Phase

c)
Conductance
d)
Resistance
41.

When a wire is formed into a coil is becomes a:

a)
capacitor
b)
inductor
c)
resistor
42.

Impedance is the combined effects of what 3 things:

a)
Current, resistance, and voltage
b)
Inductance, capacitance, and frequency
c)
Voltage, frequency, and power
d)

Resistance, inductive reactance, and capacitive reactance

43.

When are three-phase induction motors are used:

a)

Where large amounts of power are required

b)
Single-phase motors for residential use
c)
Battery-operated devices
d)
Small appliances requiring low power
44.

The three-phase AC induction motor is also called

a)
universal motor
b)
single-phase motor
c)
rotating field motor
d)
squirrel cage motor
45.

The most common alternator used in aircraft systems today is the

a)
induction alternator
b)
permanent magnet alternator
c)

3 phase alternator

d)
synchronous alternator
46.

Among the factors, which determine the voltage output of a generator, only one, ______can be conveniently controlled.

a)
rotational speed
b)

strength of the field current

c)
load resistance
d)
wire gauge
47.

The purpose of the reverse current cutout relay is to

a)
allow reverse current flow
b)
increase current flow
c)
disconnect the power supply
d)

disconnect the battery from the generator when generator voltage is lower that battery voltage

48.

The purpose of the vibrator-type current limiter is to

a)
convert AC to DC power
b)

limit the output current of the generator automatically to its maximum

c)
increase voltage in electrical circuits
d)
measure resistance in electrical components
49.

Since the speed of an aircraft engine varies, what keeps the alternator output steady

a)
A fuel pump regulates the alternator output.
b)
The battery maintains a constant output.
c)
An inverter stabilizes the alternator output.
d)

Constant speed drive

50.

Electrons flow at what speed?

a)

drift velocity

b)

speed of light

c)

proton mass is greater than electron

51.

Permeability is known as?

a)
the measure of a material's density
b)
the resistance of a material to electrical flow
c)

the each which magnetic flux can penetrate a material

52.

Ni-Cads have an undesirable characteristic caused by constant overcharge and infrequent discharge, and known technically as

a)
charge retention
b)
discharge failure
c)

voltage depression

53.

The lead acid battery is made up of a series of cells, each containing positive plates of _________, and negative plates of __________.

a)

lead dioxide, spongy lead

b)
zinc chloride, aluminum foil
c)
copper sulfate, iron oxide
54.

Since inductive reactance causes voltage to lead the current, the total current which contains a component of inductive current __________ the applied voltage

a)
is in phase with
b)
leads the
c)
lags behind
55.

One amp of current is equivalent to one coulomb, one coulomb of charge is equal to

a)

drift velocity

b)

one farad

c)

6.28 billion electrons

56.

Nearly all fractional horsepower motors in use today are of what type

a)

capacitor start motor

b)

dc start motor

c)

synchronous