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Block IV Study Guide

Total questions: 62

Worksheet time: 31mins

Name
Class
Date
1.

How can the direction of the lines of force be determined when the direction of current flow is known?

a)
Use the foot rule
b)
Use the middle finger rule
c)
Use the left-hand rule
2.

What is the reason of the constant flow of current in the same direction through the external circuit in a DC generator

a)
Commutator
b)
Field winding
c)
Slip rings
d)
Armature winding
3.

How is the state of charge of a lead-acid battery indicated?

a)
By measuring the specific gravity of the electrolyte or checking the voltage with a voltmeter.
b)
By listening to the sound the battery makes
c)

By shaking the battery

d)
By counting the number of cells in the battery
4.

What is the primary instrument to monitor immediately after fuel flow during the starting sequence of a turbine engine?

a)
Oil pressure gauge
b)
N1 gauge
c)
Fuel pressure gauge
d)
EGT gauge
5.

The law of electromagnetic induction states that "the induced electromotive force (emf) in a closed loop of wire is"

a)
not affected by the rate of change of magnetic flux through the loop
b)

directly proportional to the rate of change of magnetic flux through a coil of wire

c)
inversely proportional to the rate of change of magnetic flux through the loop
d)
dependent on the resistance of the wire in the loop
6.

"The number of cycles per second is a definition of frequency, and the standard unit measurement is _____."

a)

Watts

b)

Ohms

c)

Hertz

7.

What are the factors that influence resistance in an electrical circuit?

a)
Voltage, current, and power
b)

Area, temperature, length, material

c)
Resistance, inductance, and capacitance
d)
Color, shape, and size
8.

Apparent power is the power consumed by the entire circuit, including both resistance and reactance.

a)

Symbolized by letters AP and measured in Watts

b)

Sybolized by letter S and measured in Volt-Amps

c)

Less than true power

9.

Microbiological growth is frequently found in which type of aircraft fuel?

a)
Avgas
b)
Jet B fuel
c)
Diesel fuel
d)
Jet A fuel
10.

To measure resistance in a circuit, the circuit must be?

a)
placed in water
b)
measured with a voltmeter
c)
disconnected from any power source
d)
connected to a power source
11.

True or False: The magnetic field that escapes a transformer during operation is called leakage flux.

a)
False
b)
True
12.

At which frequency do the effects of a capacitor and inductor become equivalent?

a)
Matched frequency
b)
Parallel frequency
c)
Harmonic frequency
d)
Resonant frequency
13.

8 µF capacitor is expressed?

a)

.008

b)

.00008

c)

.000008

d)

800,000

14.

Doping N-type semiconductor material with elements such as phosphorus, arsenic, and antimony causes it to have?

a)
Decreased conductivity
b)
Reduced resistance
c)

Excess electron

d)
Enhanced durability
15.

Lenz law can be expressed?

a)
Lenz law states that the induced current is always zero.
b)
The direction of the induced current opposes the change in magnetic flux.
c)
The direction of the induced current follows the change in magnetic flux.
d)
The direction of the induced current is independent of the change in magnetic flux.
16.

3 components of impedance?

a)
Resistance, inductance, capacitance
b)
Resistance, conductance, susceptance
c)

Apparent Power, resistance, true power

17.

Formula for Power?

a)
Power = Work x Time
b)
Power = Energy / Time
c)

Power = Force x Distance / Time

d)

Power = Mass/Elevation

18.

What is the defined as the ability to do work?

a)

energy

b)
momentum
c)
power
d)
force
19.

What are the two general types of AC motors commonly used in aircraft systems?

a)
Induction motors and synchronous motors
b)
Single-phase motors and three-phase motors
c)
Brushless motors and brushed motors
d)
Direct current motors and stepper motors
20.

How many footpounds is One Horsepower?

a)
450
b)
500
c)
600
d)
550
21.

Gains are basic functionality of all _____?

a)

Conductors

b)

Amplifiers

c)

Logic Gates

22.

The most noticeable effect observed when a battery is reversed, causing a diode to be reverse-biased, is...

a)

widened depletion zone

b)

little resistance

c)

no depletion zone

23.

In which type of circuit is the total current the sum of the current in all branches?

a)
Sequential circuit
b)
Combined circuit
c)
Series circuit
d)
Parallel circuit
24.

Current flowing in one direction is called?

a)
Direct Current (DC)
b)
Alternating Current (AC)
c)
Backward Current (BC)
d)
Reverse Current (RC)
25.

What factors determine the frequency of the alternator voltage?

a)
Temperature of the surrounding environment and humidity level
b)
Length of the power cord and brand of the alternator
c)
Material of the alternator casing and color of the wires
d)
Speed of the rotor and number of poles in the alternator
26.

Exploded view drawing for A & P?

a)
An exploded view drawing for A & P would display the various parts of a car assembled together.
b)
An exploded view drawing for A & P would show the parts scattered randomly with no relation.
c)
An exploded view drawing for A & P would display the various parts of an aircraft or powerplant separated from each other to show their arrangement and relationship.
d)
An exploded view drawing for A & P would only focus on one specific part without context.
27.

Out of the series, shut, or compound motors, which one is suitable for constant speed?

a)
Shunt motors
b)
Series motors
c)
Compound motors
28.

What type of switch uses incandescent or LED bulbs to indicate its function?

a)

lighted pushbutton switches

b)
slide switch
c)
push button switch
d)
toggle switch
29.

Converts DC power to AC?

a)
Converter
b)
Transformer
c)
Inverter
d)
Rectifier
30.

Shells does what in a atom?

a)
Determines the energy level of electrons
b)
Regulates the size of the nucleus
c)
Determines the color of the atom
d)
Controls the temperature of the atom
31.

Anything that has mass and volume?

a)
Matter
b)
Energy
c)
Space
d)
Time
32.

Zener diode?

a)
Zener diode is used for amplification purposes
b)
Zener diode only allows current to flow in one direction
c)
Zener diode is a type of diode that allows current to flow in both forward and reverse directions when a certain voltage threshold is reached.
d)
Zener diode is a type of resistor
33.

Flight extinguisher most common fire extinguisher?

a)

CO2

b)

Halon

c)

Water

d)
LMN fire extinguisher
34.

GCU is the accronym for what in regards to a generator?

a)
Generator Control Unit
b)

Generator Cruising Module

35.

ESD is an acronym to what pertaining to aircraft?

a)
Enhanced Safety Device
b)
Electronic System Design
c)
Emergency Shutdown
d)
Electrostatic Discharge
36.

Inductor unit of measure?

a)

Henries (H)

b)
Volt (V)
c)
Ohm (Ω)
d)
Farad (F)
37.

Resistor that varies current?

a)
Constant resistor
b)

Rheostat

c)
Stable resistor
d)
Unchanging resistor
38.

A lead-acid battery with 24 volts and 12 cells produces ___ volts per cell?

a)

2

b)

6

c)

12

39.

Unit of measure for Capacitance Reactance?

a)
Volts
b)
Farads
c)
Watts
d)
Ohms
40.

Voltage and Current pass through zero and reach maximum value at the same moment are said to be?

a)
Counter-phase
b)
Opposite-phase
c)
In-phase
d)
Out-phase
41.

Electron flow theory:

a)
Electrons flow from the positive terminal to the negative terminal.
b)
Electrons flow from the negative terminal to the positive terminal.
42.

Conventional Flow theory?

a)
Current flows from the negative terminal to the positive terminal in Conventional Flow theory.
b)
Current flows from the positive terminal to the negative terminal in Conventional Flow theory.
43.

A Rectifier?

a)
Converts alternating current (AC) to direct current (DC)
b)
Converts direct current (DC) to alternating current (AC)
44.

Thermal source of electricity is know as a?

a)
Thermal energy station
b)
Thermal power generator
c)

Thermocouple

d)
Hydrothermal power plant
45.

An inifinitely large resistance is:

a)
Low resistance
b)
High resistance
c)
Short circuit
d)
Open circuit
46.

Three factors of resistance in AC circuit?

a)

Impedance, Control, Transistor

b)

DC, AC, Capacitor

c)
Resistance, Inductance, Capacitance
47.

Root Mean Square is also known as?

a)

Effective value

b)

Volts

c)

Volt/Amps

48.

True of False: No. 000 or finer is used to properly seat DC generator brushes?

a)
False
b)
True
49.

Electrostatic Field defined?

a)

Force field that surrounds electrically charged body

b)
A type of sound wave
c)
A type of gravitational field
d)
A type of magnetic field
50.

True or False: AC current has replaced DC current in commercial power systems?

a)
False
b)
True
51.

The open cell voltage of a NiCad battery is?

a)
1.5 volts
b)
1.0 volts
c)
2.0 volts
d)

1.25 volts

52.

True or False: Capacitors are connected in parallel, the effective plae are increases, and the total capacitance is the sum of the individual capacitances

a)
True
b)
False
53.

Is heat classified as unwanted loss of energy in relation to fixed resistors?

a)

True

b)

False

54.

What is the Vernier scale graduation on a micrometer?

a)

0.005

b)

0.0001

c)

0.002

d)

0.003

55.

True or False: Standard atmosperic pressure can suppor a column of mercury that is 29.92 inches tall?

a)
False
b)
True
56.

A dry cell is the most common type of ____ battery?

a)
secondary
b)
primary
c)
rechargeable
d)
alkaline
57.

Four categories of matter?

a)

Solid, liquid, gas, lead-acid

b)
Solid, liquid, gas, plasma
c)

Solid, liquid, gas, rock

58.

Electrolyte of a NiCad battery?

a)
potassium hydroxide (KOH)
b)
magnesium sulfate
c)
calcium carbonate
d)
sodium chloride
59.

NiCad battery electrolyte is neutralized with?

a)
sodium hydroxide (NaOH)
b)

boric acid

c)
calcium hydroxide (Ca(OH)2)
d)
lithium hydroxide (LiOH)
60.

Ther density of a substance is its weight?

a)

Per unit volume

b)

Per unit count

c)

Per Atomic weight

61.

Potential Difference is known as:

a)
Current
b)
Resistance
c)
Power
d)
Voltage
62.

Two ways to connect three-phase alternators?

a)

Wye connection and delta connection

b)

Series connection

c)

Delta connection

d)
Y connection

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