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1993-03-09
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160D-17.5 B 4-14 When a transmitter's output power is |increased by 6 dB(4 times), an S-meter|on a receiver will increase one S-unit
When the power output from a transmitter is increased by four
times, how should the S-meter reading on a nearby receiver change?
A. Decrease by approximately one S-unit
B. Increase by approximately one S-unit
C. Increase by approximately four S-units
D. Decrease by approximately four S-units
*
161D-17.6 C 4-14 When a transmitter's output power is |increased by 6 dB(4 times), an S-meter|on a receiver will increase one S-unit
By how many times must the power output from a transmitter be
increased to raise the S-meter reading on a nearby receiver
from S-8 to S-9?
A. Approximately 2 times
B. Approximately 3 times
C. Approximately 4 times
D. Approximately 5 times
*
162E-1.1 C 5-23 Impedance is the opposition to|the flow of AC in a circuit
What is meant by the term impedance?
A. The electric charge stored by a capacitor
B. The opposition to the flow of AC in a circuit containing
only capacitance
C. The opposition to the flow of AC in a circuit
D. The force of repulsion presented to an electric field by
another field with the same charge
*
163E-1.2 C 5-23 Impedance is the opposition to|the flow of AC in a circuit
What is the opposition to the flow of AC in a circuit
containing both resistance and reactance called?
A. Ohm
B. Joule
C. Impedance
D. Watt
*
164E-3.1 B 5-21 Reactance(inductive and capacitive)|is the opposition to AC caused by |inductors and capacitors
What is meant by the term reactance?
A. Opposition to DC caused by resistors
B. Opposition to AC caused by inductors and capacitors
C. A property of ideal resistors in AC circuits
D. A large spark produced at switch contacts when an
inductor is de-energized
*
165E-3.2 D 5-22 Inductive reactance
What is the opposition to the flow of AC caused by an
inductor called?
A. Resistance
B. Reluctance
C. Admittance
D. Reactance
*
166E-3.3 D 5-21 Capacitive reactance
What is the opposition to the flow of AC caused by a
capacitor called?
A. Resistance
B. Reluctance
C. Admittance
D. Reactance
*
167E-3.4 D 5-22 Frequency increases|reactance increases
How does a coil react to AC?
A. As the frequency of the applied AC increases, the
reactance decreases
B. As the amplitude of the applied AC increases, the
reactance also increases
C. As the amplitude of the applied AC increases, the
reactance decreases
D. As the frequency of the applied AC increases, the
reactance also increases
*
168E-3.5 A 5-22 Frequency increases|reactance decreases
How does a capacitor react to AC?
A. As the frequency of the applied AC increases, the
reactance decreases
B. As the frequency of the applied AC increases, the
reactance increases
C. As the amplitude of the applied AC increases, the
reactance also increases
D. As the amplitude of the applied AC increases, the
reactance decreases
*
169E-6.1 A 5-24 When the impedance of the load is|matched to the source impedance|and the SWR is minimum, ie. 1:1
When will a power source deliver maximum output?
A. When the impedance of the load is equal to the impedance of
the source
B. When the SWR has reached a maximum value
C. When the power supply fuse rating equals the primary winding
current
D. When air wound transformers are used instead of iron core
transformers
*
170E-6.2 D 5-24 Impedance matching means to adjust the|load impedance so that it matches the |source & maximum power is transferred
What is meant by impedance matching?
A. To make the load impedance much greater than the
source impedance
B. To make the load impedance much less than the source
impedance
C. To use a balun at the antenna feed point
D. To make the load impedance equal the source impedance
*
171E-6.3 D 5-24 When the load impedance is matched|to the source, the source delivers|maximum power to the load
What occurs when the impedance of an electrical load is
equal to the internal impedance of the power source?
A. The source delivers minimum power to the load
B. There will be a high SWR condition
C. No current can flow through the circuit
D. The source delivers maximum power to the load
*
172E-6.4 A 5-24 So that the source delivers|maximum power to the load
Why is impedance matching important in radio work?
A. So the source can deliver maximum power to the load
B. So the load will draw minimum power from the source
C. To ensure that there is less resistance than reactance
in the circuit
D. To ensure that the resistance and reactance in the
circuit are equal
*
173E-7.2 B 5-21 Ohm
What is the unit measurement of reactance?
A. Mho
B. Ohm
C. Ampere
D. Siemens
*
174E-7.4 A 5-24 Ohm
What is the unit measurement of impedance?
A. Ohm
B. Volt
C. Ampere
D. Watt
*
175E-10.1 A 5-11 A unit created by Bell |to describe a change in|power levels
What is a bel?
A. The basic unit used to describe a change in power levels
B. The basic unit used to describe a change in inductances
C. The basic unit used to describe a change in capacitances
D. The basic unit used to describe a change in resistances
*
176E-10.2 A 5-11 A tenth of a bel
What is a decibel?
A. A unit used to describe a change in power levels,
equal to 0.1 bel
B. A unit used to describe a change in power levels,
equal to 0.01 bel
C. A unit used to describe a change in power levels,
equal to 10 bels
D. A unit used to describe a change in power levels,
equal to 100 bels
*
177E-10.3 D 5-11 One dB
Under ideal conditions, a barely detectable change in loudness
is approximately how many dB?
A. 12 dB
B. 6 dB
C. 3 dB
D. 1 dB
*
178E-10.4 B 5-12 This is a good one to remember |Change in dB = 10*LOG(P2/P1) |Change in dB = 10*LOG(2) = 3 dB
A two-times increase in power results in a change of how
many dB?
A. Multiplying the original power by 2 gives a new power
that is 1 dB higher
B. Multiplying the original power by 2 gives a new power
that is 3 dB higher
C. Multiplying the original power by 2 gives a new power
that is 6 dB higher
D. Multiplying the original power by 2 gives a new power
that is 12 dB higher
*
179E-10.5 D 5-13 If 3 dB is 2 times, then|6 dB is 2 times 2 times |ie. 4 times
An increase of 6 dB results from raising the power by how
many times?
A. Multiply the original power by 1.5 to get the new power
B. Multiply the original power by 2 to get the new power
C. Multiply the original power by 3 to get the new power
D. Multiply the original power by 4 to get the new power
*
180E-10.6 B 5-12 DBs are ratios. If +3 dB is double|then -3 dB is half, ie. divide by 2
A decrease of 3 dB results from lowering the power by how
many times?
A. Divide the original power by 1.5 to get the new power
B. Divide the original power by 2 to get the new power
C. Divide the original power by 3 to get the new power
D. Divide the original power by 4 to get the new power
*
181E-10.7 C 5-12 Since 10*LOG(150/1500) = -10dB|then S9 + 10 dB -10 dB = S9
A signal strength report is "10 dB over S9." If the
transmitter power is reduced from 1500 watts to 150
watts, what should be the new signal strength report?
A. S5
B. S7
C. S9
D. S9 plus 5 dB
*
182E-10.8 D 5-12 Since 10*LOG(150/1500) = -10dB then|S9 + 20 dB -10 dB = S9 + 10 dB
A signal strength report is "20 dB over S9." If the
transmitter power is reduced from 1500 watts to 150
watts, what should be the new signal strength report?
A. S5
B. S7
C. S9
D. S9 plus 10 dB
*
183E-10.9 C 5-12 Since 10*LOG(15/1500) = -20dB then|S9 + 20 dB -20 dB = S9
A signal strength report is "20 dB over S9." If the
transmitter power is reduced from 1500 watts to 15
watts, what should be the new signal strength report?
A. S5
B. S7
C. S9
D. S9 plus 10 dB
*
184E-12.1 D 5-6 Current splits evenly|into two .5 amps
If a 1.0-ampere current source is connected to two parallel-
connected 10 ohm resistors, how much current passes through
each resistor?
A. 10 amperes
B. 2 amperes
C. 1 ampere
D. 0.5 ampere
*
185E-12.3 B 5-8 The total current equals the|sum of the branch currents, |ie. It = I1 + I2 + I3...
In a parallel circuit with a voltage source and several branch
resistors, what relationship does the total current have to the
current in the branch circuits?
A. The total current equals the average of the branch current
through each resistor
B. The total current equals the sum of the branch current through
each resistor
C The total current decreases as more parallel resistors are
added to the circuit
D. The total current is calculated by adding the voltage drops
across each resistor and multiplying the sum by the total
number of all circuit resistors
*
186E-13.1 B 5-8 P = E*E/R, P = 400*400/800|P = 160000/800, P = 200
How many watts of electrical power are being used when a
400-VDC power source supplies an 800 ohm load?
A. 0.5 watt
B. 200 watts
C. 400 watts
D. 320,000 watts
*
187E-13.2 D 5-10 P = I*E, P = .2*12, P = 2.4 watts
How many watts of electrical power are being consumed by a
12-VDC pilot light which draws 0.2-amperes?
A. 60 watts
B. 24 watts
C. 6 watts
D. 2.4 watts
*
188E-13.3 A 5-10 P = I*I*R, P = .007*.007*1250 |P = .061 watts, ie. 61 milliwatts
How many watts are being dissipated when 7.0-milliamperes
flows through 1.25 kilohms?
A. Approximately 61 milliwatts
B. Approximately 39 milliwatts
C. Approximately 11 milliwatts
D. Approximately 9 milliwatts
*
189E-14.1 C 5-5 The total resistance is the sum|of individual resistances, ie.|Rt = R1 + R2 + R3...
How is the total resistance calculated for several resistors
in series?
A. The total resistance must be divided by the number of
resistors to ensure accurate measurement of resistance
B. The total resistance is always the lowest-rated resistance
C. The total resistance is found by adding the individual
resistances together
D. The tolerance of each resistor must be raised proportionally
to the number of resistors
*
190E-14.2 D 5-6 In general, the total resistance is|the product divided by the sum. If|R1 = R2 then Rt = R1*R1/2*R1 = R1/2
What is the total resistance of two equal, parallel-connected
resistors?
A. Twice the resistance of either resistance
B. The sum of the two resistances
C. The total resistance cannot be determined without
knowing the exact resistances
D. Half the resistance of either resistor
*
191E-14.3 A 5-18 If no mutual coupling, inductances in|parallel add the same as resistors in|parallel, ie total inductance is L1/2
What is the total inductance of two equal, parallel-connected
inductors?
A. Half the inductance of either inductor, assuming no mutual
coupling
B. Twice the inductance of either inductor, assuming no mutual
coupling
C. The sum of the two inductances, assuming no mutual coupling
D. The total inductance cannot be determined without knowing
the exact inductances
*