Transcript T5D [29]-[51]

Technician Licensing Class
T 5 A - T5D
Valid July 1, 2014
Through
June 30, 2018
1
T5A
• Electrical current is measured in amperes.
T5A01
• The basic unit of electrical power is measured in Watts.
T5A02
• The name for the flow of electrons in an electric circuit is
current.
T5A03
2
T5A
• The name for a current that flows only in one direction is
called direct current. T5A04
Motor cycle
battery
AAA
battery
9 Volt
battery
Hand held
battery
• The electrical term for the electromotive force (EMF)
that causes electron flow is voltage.
T5A05
• A mobile transceiver usually requires 12 volts.
T5A06
3
• A mobile transceiver usually requires 12 volts.
• Copper is a good electrical conductor.
• A good electrical insulator is glass.
T5A06
T5A07
T5A08
• The name for a current that reverses direction on a
regular basis is alternating current.
T5A09
T5A
• The term that describes the rate at which electrical
energy is used is called Power.
T5A10
• The basic unit of electromotive force is voltage.
T5A11
• Frequency is the term to describe the number of times
per second that an alternating current reverses direction.
T5A12
5
T5B
• 1.5 amperes is the same as: 1,500 milliamperes.
T5B01
• Another way to specify a radio signal frequency of
1,500,000 hertz is: 1500 kHz
T5B02
• There are one thousand volts in:
One Kilovolt
T5B03
• One one-millionth of a volt is equal to: one microvolt
T5B04
6
T5B
• 500 milliwatts is equivalent to: 0.5 watts.
T5B05
• If an ammeter calibrated in amperes is used to
measure a 3000-milliampere current, the reading
would show: 3 amperes
T5B06
• A frequency readout calibrated in megahertz shows
a reading of 3.525 MHz, if calibrated in kilohertz it
would show: 3525 kHz
T5B07
• 1,000,000 picofarads is the same as: 1 microfard
T5B08
7
T5B
• 3 dB is the approximate amount of change, measured in
decibels (dB) of a power increase from 5 watts to 10 watts.
T5B09
• The approximate amount
of change, measured in
decibels (dB) of a power
decrease from 12 watts
to 3 watts is -6 dB.
T5B10
8
T5B
• The approximate amount of
change, measured in decibels
(dB), of a power increase from
20 watts to 200 watts is 10 dB. T5B11
• 28,400 kHz is equal to: 28.400MHz
T5B12
• If a frequency readout shows a reading of 2425 MHz, it
can be read as: 2.425 GHz
T5B13
9
T5C
• The ability to store energy in an electric field is called
capacitance.
T5C01
• The basic unit of capacitance is the farad.
T5C02
• The ability to store energy in a magnetic field is called
Inductance.
T5C03
• The basic unit of inductance is the henry.
• The unit of frequency is the Hertz.
T5C04
T5C05
• The abbreviation “RF” refers to radio frequency signals
10
of all types.
T5C06
T5C
• The usual name for Electromagnetic waves that travel
through space are radio waves.
T5C07
11
T5C
• The formula used to calculate electrical power in a DC
circuit is Power (P) equals voltage (E) multiplied by
current (I).
T5C08
12
T5C
• The power being used in a circuit when the applied voltage
is 13.8 volts DC and the current is 10 amperes is:
T5C09
• Solving for “P” so cover up the P and plug in the other
two numbers
• E is given as 13.8 volts and I is given as 10 amperes
P=IxE
P = 10 x 13.8
P = 138 Watts
T5C
• The power being used in a circuit when the applied voltage
is 12 volts DC and the current is 2.5 amperes is:
T5C10
• Solving for “P” so cover up the “P” and plug in the other two
numbers
• E is given as 12 volts and I is given as 2.5 amperes
P=IxE
P = 2.5 x 12
P = 30 watts
T5C
• The amount of current flowing in a circuit when the
power in a circuit is 120 watts and the applied voltage is
12 volts is:
T5C11
• Solving for “I” so cover up the “I” and plug in the other
two numbers
• P is given as 120 watts and E is given as 12 volts and
I=P/E
I = 120  12
I = 10 Amperes
15
T5C
• Impedance is a measure of the opposition to AC current
flow in a circuit.
T5C12
• The unit of impedance is the ohm.
T5C13
16
T5D
• The formula used to calculate current in a circuit is
Current (I) equals Voltage (E) divided by
Resistance (R).
T5D01
17
T5D
• This formula us used to calculate voltage in a circuit:
Voltage (E) equals Current (I) multiplied by Resistance
(R).
T5D02
18
T5D
• This formula us used to calculate resistance in a
circuit: Resistance (R) equals Voltage (E) divided
by Current (I).
T5D03
19
T5D
• The resistance of a circuit in which a current of 3 amperes
flows thru a resistor connected to 90 volts is:
T5D04
R=E/I
R = 90  3
R = 30 Ohms
20
T5D
• The resistance of a circuit in which the applied
voltage is 12 volts and the current flow is 1.5
amperes is:
T5D05
R=E/I
R = 12  1.5
R = 8 Ohms
21
T5D
• The resistance of a circuit that draws 4 amperes
from a 12-volt source is:
T5D06
R=E/I
R = 12  4
R = 3 Ohms
22
T5D
• The current flowing thru a 80-ohm resistor connected
across 120 volts is:
T5D07
I=E/R
I = 120  80
I = 1.5 Amperes
23
T5D
• The current flowing thru a 100-ohm resistor connected
across 200 volts is:
T5D08
I=E/R
I = 200  100
I = 2 Amperes
24
T5D
• The current flowing thru a 24-ohm resistor connected
across 240 volts is:
T5D09
I=E/R
I = 240  24
I = 10 Amperes
25
T5D
• The voltage across a 2-ohm resistor if a current of 0.5
amperes flows thru it is:
T5D10
E=IxR
E = 0.5 x 2
E = 1 Volt
26
T5D
• The voltage across a 10-ohm resistor if a current of 1
amperes flows thru it is:
T5D11
E=IxR
E = 1.0 x 10
E = 10 Volts
27
T5D
• The voltage across a 10-ohm resistor if a current of 2
amperes flows thru it is:
T5D12
E=IxR
E = 2.0 x 10
E = 20 Volts
28
Ohms Law Wheel
29
Element 2 Technician Class
Question Pool
T 5 A –T 5 D
Valid July 1, 2014
Through
June 30, 2018
30
T5A01
Electrical current is measured in which of the
following units?
A.
B.
C.
D.
Volts
Watts
Ohms
Amperes
31
T5A02
Electrical power is measured in which of the
following units?
A.
B.
C.
D.
Volts
Watts
Ohms
Amperes
32
T5A03
What is the name for the flow of electrons in
an electric circuit?
A.
B.
C.
D.
Voltage
Resistance
Capacitance
Current
33
T5A04
What is the name for a current that flows
only in one direction?
A.
B.
C.
D.
Alternating current
Direct current
Normal current
Smooth current
34
T5A05
What is the electrical term for the electromotive
force (EMF) that causes electron flow?
A.
B.
C.
D.
Voltage
Ampere-hours
Capacitance
Inductance
35
T5A06
How much voltage does a mobile
transceiver usually require?
A.
B.
C.
D.
About 12 volts
About 30 volts
About 120 volts
About 240 volts
36
T5A07
Which of the following is a good electrical
conductor?
A.
B.
C.
D.
Glass
Wood
Copper
Rubber
37
T5A08
Which of the following is a good electrical
insulator?
A.
B.
C.
D.
Copper
Glass
Aluminum
Mercury
38
T5A09
What is the name for a current that reverses
direction on a regular basis?
A.
B.
C.
D.
Alternating current
Direct current
Circular current
Vertical current
39
T5A10
Which term describes the rate at which electrical
energy is used?
A.
B.
C.
D.
Resistance
Current
Power
Voltage
40
T5A11
What is the basic unit of electromotive force?
A.
B.
C.
D.
The volt
The watt
The ampere
The ohm
41
T5A12
What term describes the number of times per
second that an alternating current reverses
direction?
A.
B.
C.
D.
Pulse rate
Speed
Wavelength
Frequency
42
T5B01
How many milliamperes is 1.5 amperes?
A.
B.
C.
D.
15 milliamperes
150 milliamperes
1,500 milliamperes
15,000 milliamperes
43
T5B02
What is another way to specify a radio
signal frequency of 1,500,000 hertz?
A.
B.
C.
D.
1500 kHz
1500 MHz
15 GHz
150 kHz
44
T5B03
How many volts are equal to one kilovolt?
A.
B.
C.
D.
One one-thousandth of a volt
One hundred volts
One thousand volts
One million volts
45
T5B04
How many volts are equal to one microvolt?
A.
B.
C.
D.
One one-millionth of a volt
One million volts
One thousand kilovolts
One one-thousandth of a volt
46
T5B05
Which of the following is equivalent to 500
milliwatts?
A.
B.
C.
D.
0.02 watts
0.5 watts
5 watts
50 watts
47
T5B06
If an ammeter calibrated in amperes is used to
measure a 3000-milliampere current, what
reading would it show?
A.
B.
C.
D.
0.003 amperes
0.3 amperes
3 amperes
3,000,000 amperes
48
T5B07
If a frequency readout calibrated in megahertz shows
a reading of 3.525 MHz, what would it show if it
were calibrated in kilohertz?
A.
B.
C.
D.
0.003525 kHz
35.25 kHz
3525 kHz
3,525,000 kHz
49
T5B08
How many microfarads are 1,000,000 picofarads?
A.
B.
C.
D.
0.001 microfarads
1 microfarad
1000 microfarads
1,000,000,000 microfarads
50
T5B09
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 5 watts to 10 watts?
A.
B.
C.
D.
2 dB
3 dB
5 dB
10 dB
51
T5B10
What is the approximate amount of change,
measured in decibels (dB), of a power decrease
from 12 watts to 3 watts?
A.
B.
C.
D.
-1 dB
-3 dB
-6 dB
-9 dB
52
T5B11
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 20 watts to 200 watts?
A.
B.
C.
D.
10 dB
12 dB
18 dB
28 dB
53
T5B12
Which of the following frequencies is equal to
28,400 kHz?
A.
B.
C.
D.
28.400 MHz
2.800 MHz
284.00 MHz
28.400 kHz
54
T5B13
If a frequency readout shows a reading of 2425
MHz, what frequency is that in GHz?
A.
B.
C.
D.
0.002425 GHz
24.25 GHz
2.425 GHz
2425 GHz
55
T5C01
What is the ability to store energy in an electric
field called?
A.
B.
C.
D.
Inductance
Resistance
Tolerance
Capacitance
56
T5C01
What is the ability to store energy in an electric
field called?
A.
B.
C.
D.
Inductance
Resistance
Tolerance
Capacitance
57
T5C03
What is the ability to store energy in a magnetic
field called?
A.
B.
C.
D.
Admittance
Capacitance
Resistance
Inductance
58
T5C04
What is the basic unit of inductance?
A.
B.
C.
D.
The coulomb
The farad
The henry
The ohm
59
T5C05
What is the unit of frequency?
A.
B.
C.
D.
Hertz
Henry
Farad
Tesla
60
T5C06
What does the abbreviation “RF” refer to?
A. Radio frequency signals of all types
B. The resonant frequency of a tuned circuit
C. The real frequency transmitted as opposed
to the apparent frequency
D. Reflective force in antenna transmission
lines
61
T5C07
What is a usual name for electromagnetic waves
that travel through space?
A.
B.
C.
D.
Gravity waves
Sound waves
Radio waves
Pressure waves
62
T5C08
A.
B.
C.
D.
What is the formula used to calculate
electrical power in a DC circuit?
Power (P) equals voltage (E) multiplied by current (I)
Power (P) equals voltage (E) divided by current (I)
Power (P) equals voltage (E) minus current (I)
Power (P) equals voltage (E) plus current (I)
63
T5C09
How much power is being used in a circuit when
the applied voltage is 13.8 volts DC and the
current is 10 amperes?
A.
B.
C.
D.
138 watts
0.7 watts
23.8 watts
3.8 watts
64
T5C10
How much power is being used in a circuit when
the applied voltage is 12 volts DC and the current
is 2.5 amperes?
A.
B.
C.
D.
4.8 watts
30 watts
14.5 watts
0.208 watts
65
T5C11
How many amperes are flowing in a circuit when
the applied voltage is 12 volts DC and the load is
120 watts?
A.
B.
C.
D.
0.1 amperes
10 amperes
12 amperes
132 amperes
66
T5C12
What is meant by the term impedance?
A. It is a measure of the opposition to AC current
flow in a circuit
B. It is the inverse of resistance
C. It is a measure of the Q or Quality Factor of a
component
D. It is a measure of the power handling
capability of a component
67
T5C13
What are the units of impedance?
A.
B.
C.
D.
Volts
Amperes
Coulombs
Ohms
68
T5D01
A.
B.
C.
D.
What formula is used to calculate current in a
circuit?
Current (I) equals voltage (E) multiplied by resistance (R)
Current (I) equals voltage (E) divided by resistance (R)
Current (I) equals voltage (E) added to resistance (R)
Current (I) equals voltage (E) minus resistance (R)
69
T5D02
A.
B.
C.
D.
What formula is used to calculate voltage in
a circuit?
Voltage (E) equals current (I) multiplied by resistance (R)
Voltage (E) equals current (I) divided by resistance (R)
Voltage (E) equals current (I) added to resistance (R)
Voltage (E) equals current (I) minus resistance (R)
70
T5D03
A.
B.
C.
D.
What formula is used to calculate resistance in a
circuit?
Resistance (R) equals voltage (E) multiplied by current (I)
Resistance (R) equals voltage (E) divided by current (I)
Resistance (R) equals voltage (E) added to current (I)
Resistance (R) equals voltage (E) minus current (I)
71
T5D04
What is the resistance of a circuit in which a
current of 3 amperes flows through a resistor
connected to 90 volts?
A.
B.
C.
D.
3 ohms
30 ohms
93 ohms
270 ohms
72
T5D05
What is the resistance in a circuit for which the
applied voltage is 12 volts and the current flow is
1.5 amperes?
A.
B.
C.
D.
18 ohms
0.125 ohms
8 ohms
13.5 ohms
73
T5D06
What is the resistance of a circuit that draws 4
amperes from a 12-volt source?
A.
B.
C.
D.
3 ohms
16 ohms
48 ohms
8 ohms
74
T5D07
What is the current flow in a circuit with an
applied voltage of 120 volts and a resistance of 80
ohms?
A.
B.
C.
D.
9600 amperes
200 amperes
0.667 amperes
1.5 amperes
75
T5D08
What is the current flowing through a 100-ohm
resistor connected across 200 volts?
A.
B.
C.
D.
20,000 amperes
0.5 amperes
2 amperes
100 amperes
76
T5D09
What is the current flowing through a 24-ohm
resistor connected across 240 volts?
A.
B.
C.
D.
24,000 amperes
0.1 amperes
10 amperes
216 amperes
77
T5D10
What is the voltage across a 2-ohm resistor if a
current of 0.5 amperes flows through it?
A.
B.
C.
D.
1 volt
0.25 volts
2.5 volts
1.5 volts
78
T5D11
What is the voltage across a 10-ohm resistor if a
current of 1 ampere flows through it?
A.
B.
C.
D.
1 volt
10 volts
11 volts
9 volts
79
T5D12
What is the voltage across a 10-ohm resistor if a
current of 2 amperes flows through it?
A.
B.
C.
D.
8 volts
0.2 volts
12 volts
20 volts
80