Transcript Amateur Radio Technician Class Element 2 Course Presentation

Element 2 Technician Class
Question Pool
T5
Electrical principles, math for electronics,
electronic principles, Ohm’s Law
[4 Exam Questions – 4 Groups]
Valid July 1, 2010
Through
June 30, 2014
T5A01
A.
B.
C.
D.
Electrical current is measured in which of
the following units?
Volts
Watts
Ohms
Amperes
2
T5A02
A.
B.
C.
D.
Electrical power is measured in which of
the following units?
Volts
Watts
Ohms
Amperes
3
T5A03
A.
B.
C.
D.
What is the name for the flow of electrons in
an electric circuit?
Voltage
Resistance
Capacitance
Current
4
T5A04
A.
B.
C.
D.
What is the name for a current that flows
only in one direction?
Alternating current
Direct current
Normal current
Smooth current
5
T5A05
A.
B.
C.
D.
What is the electrical term for the
electromotive force (EMF) that causes
electron flow?
Voltage
Ampere-hours
Capacitance
Inductance
6
T5A06
A.
B.
C.
D.
How much voltage does a mobile
transceiver usually require?
About 12 volts
About 30 volts
About 120 volts
About 240 volts
7
T5A07
A.
B.
C.
D.
Which of the following is a good electrical
conductor?
Glass
Wood
Copper
Rubber
8
T5A08
A.
B.
C.
D.
Which of the following is a good electrical
insulator?
Copper
Glass
Aluminum
Mercury
9
T5A09
A.
B.
C.
D.
What is the name for a current that reverses
direction on a regular basis?
Alternating current
Direct current
Circular current
Vertical current
10
T5A10
A.
B.
C.
D.
Which term describes the rate at which
electrical energy is used?
Resistance
Current
Power
Voltage
11
T5A11
A.
B.
C.
D.
What is the basic unit of electromotive
force?
The volt
The watt
The ampere
The ohm
12
T5B01
A.
B.
C.
D.
How many milliamperes is 1.5 amperes?
15 milliamperes
150 milliamperes
1,500 milliamperes
15,000 milliamperes
13
T5B02
A.
B.
C.
D.
What is another way to specify a radio
signal frequency of 1,500,000 hertz?
1500 kHz
1500 MHz
15 GHz
15 kHz
14
T5B03
A.
B.
C.
D.
How many volts are equal to one kilovolt?
One one-thousandth of a volt
One hundred volts
One thousand volts
One million volts
15
T5B04
A.
B.
C.
D.
How many volts are equal to one microvolt?
One one-millionth of a volt
One million volts
One thousand kilovolts
One one-thousandth of a volt
16
T5B05
A.
B.
C.
D.
Which of the following is equivalent to 500
milliwatts?
0.02 watts
0.5 watts
5 watts
50 watts
17
T5B06
A.
B.
C.
D.
If an ammeter calibrated in amperes is
used to measure a 3000-milliampere
current, what reading would it show?
0.003 amperes
0.3 amperes
3 amperes
3,000,000 amperes
18
T5B07
A.
B.
C.
D.
If a frequency readout calibrated in megahertz
shows a reading of 3.525 MHz, what would it show
if it were calibrated in kilohertz?
0.003525 kHz
35.25 kHz
3525 kHz
3,525,000 kHz
19
T5B08
A.
B.
C.
D.
How many microfarads are 1,000,000
picofarads?
0.001 microfarads
1 microfarad
1000 microfarads
1,000,000,000 microfarads
20
T5B09
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 5 watts to 10 watts?
2 dB
3 dB
5 dB
10 dB
21
T5B10
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power decrease
from 12 watts to 3 watts?
1 dB
3 dB
6 dB
9 dB
22
T5B11
A.
B.
C.
D.
What is the approximate amount of change,
measured in decibels (dB), of a power increase
from 20 watts to 200 watts?
10 dB
12 dB
18 dB
28 dB
23
T5C01
A.
B.
C.
D.
What is the ability to store energy in an
electric field called?
Inductance
Resistance
Tolerance
Capacitance
24
T5C02
A.
B.
C.
D.
What is the basic unit of capacitance?
The farad
The ohm
The volt
The henry
25
T5C03
A.
B.
C.
D.
What is the ability to store energy in a
magnetic field called?
Admittance
Capacitance
Resistance
Inductance
26
T5C04
A.
B.
C.
D.
What is the basic unit of inductance?
The coulomb
The farad
The henry
The ohm
27
T5C05
A.
B.
C.
D.
What is the unit of frequency?
Hertz
Henry
Farad
Tesla
28
T5C06
A.
B.
C.
D.
What is the abbreviation that refers to radio
frequency signals of all types?
AF
HF
RF
VHF
29
T5C07
A.
B.
C.
D.
What is a usual name for electromagnetic
waves that travel through space?
Gravity waves
Sound waves
Radio waves
Pressure waves
30
T5C08
What is the formula used to calculate
electrical power in a DC circuit?
A. Power (P) equals voltage (E) multiplied
by current (I)
B. Power (P) equals voltage (E) divided by
current (I)
C. Power (P) equals voltage (E) minus
current (I)
D. Power (P) equals voltage (E) plus
current (I)
31
T5C09
A.
B.
C.
D.
How much power is being used in a circuit
when the applied voltage is 13.8 volts DC
and the current is 10 amperes?
138 watts
0.7 watts
23.8 watts
3.8 watts
32
T5C10
A.
B.
C.
D.
How much power is being used in a circuit
when the applied voltage is 12 volts DC
and the current is 2.5 amperes?
4.8 watts
30 watts
14.5 watts
0.208 watts
33
T5C11
A.
B.
C.
D.
How many amperes are flowing in a circuit
when the applied voltage is 12 volts DC
and the load is 120 watts?
0.1 amperes
10 amperes
12 amperes
132 amperes
34
T5D01
What formula is used to calculate current in
a circuit?
A. Current (I) equals voltage (E) multiplied
by resistance (R)
B. Current (I) equals voltage (E) divided
by resistance (R)
C. Current (I) equals voltage (E) added to
resistance (R)
D. Current (I) equals voltage (E) minus
resistance (R)
35
T5D02
What formula is used to calculate voltage in
a circuit?
A. Voltage (E) equals current (I) multiplied
by resistance (R)
B. Voltage (E) equals current (I) divided
by resistance (R)
C. Voltage (E) equals current (I) added to
resistance (R)
D. Voltage (E) equals current (I) minus
resistance (R)
36
T5D03
What formula is used to calculate
resistance in a circuit?
A. Resistance (R) equals voltage (E)
multiplied by current (I)
B. Resistance (R) equals voltage (E)
divided by current (I)
C. Resistance (R) equals voltage (E) added
to current (I)
D. Resistance (R) equals voltage (E) minus
current (I)
37
T5D04
A.
B.
C.
D.
What is the resistance of a circuit in which a
current of 3 amperes flows through a
resistor connected to 90 volts?
3 ohms
30 ohms
93 ohms
270 ohms
38
T5D05
A.
B.
C.
D.
What is the resistance in a circuit for which
the applied voltage is 12 volts and the
current flow is 1.5 amperes?
18 ohms
0.125 ohms
8 ohms
13.5 ohms
39
T5D06
A.
B.
C.
D.
What is the resistance of a circuit that
draws 4 amperes from a 12-volt source?
3 ohms
16 ohms
48 ohms
8 ohms
40
T5D07
A.
B.
C.
D.
What is the current flow in a circuit with an
applied voltage of 120 volts and a
resistance of 80 ohms?
9600 amperes
200 amperes
0.667 amperes
1.5 amperes
41
T5D08
A.
B.
C.
D.
What is the current flowing through a 100ohm resistor connected across 200 volts?
20,000 amperes
0.5 amperes
2 amperes
100 amperes
42
T5D09
A.
B.
C.
D.
What is the current flowing through a 24ohm resistor connected across 240 volts?
24,000 amperes
0.1 amperes
10 amperes
216 amperes
43
T5D10
A.
B.
C.
D.
What is the voltage across a 2-ohm resistor
if a current of 0.5 amperes flows through it?
1 volt
0.25 volts
2.5 volts
1.5 volts
44
T5D11
A.
B.
C.
D.
What is the voltage across a 10-ohm
resistor if a current of 1 ampere flows
through it?
1 volt
10 volts
11 volts
9 volts
45
T5D12
A.
B.
C.
D.
What is the voltage across a 10-ohm
resistor if a current of 2 amperes flows
through it?
8 volts
0.2 volts
12 volts
20 volts
46