Tech Arsenal 1/Tech Arsenal (Arsenal Computer).ISO/tek-20/arsg10.zip/ARSGDAT.4AG

Text File | 1992-10-04 | 15KB | 710 lines

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;                                                              :
;               AMATEUR RADIO STUDY GUIDE v1.00                :
;                                                              :
;   Copyright (c) 1992 David Drzyzga - All Rights Reserved     :
;                                                              :
;      Based on a program coded in BASIC by Russ Revels        :
;                                                              :
;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
;
; You can include comments an the file anywhere you want
; just like these comments.  You cannot put a comment in
; the middle of a line though.
;
; When modifying this file, there are several things you
; must be aware of:
;
;   -> Any line of text in this file cannot exceed 65 characters!
;                                     this is the 65th character^
;
;      No harm will be done, but nothing over 65 characters will
;      be read by the program.
;
;   -> Do not make questions more than 20 lines long, or you
;      will receive an 'out of memory' error when you execute
;      the program.
;
;   -> You can add or delete questions as you please, just be
;      sure to follow the format of the existing questions.
;
;
;
(4AG-1.1)

What is a linear electronic voltage regulator?

D. A regulator in which the conduction of a control element is
varied in direct proportion to the line voltage or load current
*
(4AG-1.2)

What is a switching electronic voltage regulator?

C. A regulator in which the control device is switched on or
off, with the duty cycle proportional to the line or load
conditions
*
(4AG-1.3)

What device is usually used as a stable reference voltage in a
linear voltage regulator?

A. A Zener diode
*
(4AG-1.4)

What type of linear regulator is used in applications requiring
efficient utilization of the primary power source?

B. A series regulator
*
(4AG-1.5)

What type of linear voltage regulator is used in applications
where the load on the unregulated voltage source must be kept
constant?

D. A shunt regulator
*
(4AG-1.6)

To obtain the best temperature stability, what should be the
operating voltage of the reference diode in a linear voltage
regulator?

C. Approximately 6.0 volts
*
(4AG-1.7)

What is the meaning of the term remote sensing with regard to a
linear voltage regulator?

A. The feedback connection to the error amplifier is made
directly to the load
*
(4AG-1.8)

What is a three-terminal regulator?

D. A regulator containing a voltage reference, error amplifier,
sensing resistors and transistors, and a pass element
*
(4AG-1.9)

What the important characteristics of a three-terminal
regulator?

B. Maximum and minimum input voltage, maximum output current and
voltage
*
(4AG-2.1)

What is the distinguishing feature of a Class A amplifier?

B. Output for the entire 360 degrees of the signal cycle
*
(4AG-2.2)

What class of amplifier is distinguished by the presence of
output throughout the entire signal cycle and the input never
goes into the cutoff region?

A. Class A
*
(4AG-2.3)

What is the distinguishing characteristic of a Class B
amplifier?

D. Output for 180 degrees of the input signal cycle
*
(4AG-2.4)

What class of amplifier is distinguished by the flow of current
in the output essentially in 180 degree pulses?

B. Class B
*
(4AG-2.5)

What is a Class AB amplifier?

A. Output is present for more than 180 degrees but less than 360
degrees of the signal input cycle
*
(4AG-2.6)

What is the distinguishing feature of a Class C amplifier?

A. Output is present for less than 180 degrees of the input
signal cycle
*
(4AG-2.7)

What class of amplifier is distinguished by the bias being set
well beyond cutoff?

C. Class C
*
(4AG-2.8)

Which class of amplifier provides the highest efficiency?

C. Class C
*
(4AG-2.9)

Which class of amplifier has the highest linearity and least
distortion?

A. Class A
*
(4AG-2.10)

Which class of amplifier has an operating angle of more than 180
degrees but less than 360 degrees when driven by a sine wave
signal?

D. Class AB
*
(4AG-3.1)

What is an L-network?

B. A network consisting of an inductor and a capacitor
*
(4AG-3.2)

What is a pi-network?

D. A network consisting of one inductor and two capacitors or
two inductors and one capacitor
*
(4AG-3.3)

What is a pi-L-network?

B. A network consisting of two inductors and two capacitors
*
(4AG-3.4)

Does the L-, pi-, or pi-L-network provide the greatest harmonic
suppression?

D. Pi-L-network
*
(4AG-3.5)

What are the three most commonly used networks to accomplish a
match between an amplifying device and a transmission line?

C. L-network, pi-network and pi-L-network
*
(4AG-3.6)

How are networks able to transform one impedance to another?

D. The matching network can cancel the reactive part of an
impedance and change the value of the resistive part of an
impedance
*
(4AG-3.7)

Which type of network offers the greater transformation ratio?

B. Pi-network
*
(4AG-3.8)

Why is the L-network of limited utility in impedance matching?

A. It matches a small impedance range
*
(4AG-3.9)

What is an advantage of using a pi-L-network instead of a
pi-network for impedance matching between the final amplifier of
a vacuum-tube type transmitter and a multiband antenna?

D. Greater harmonic suppression
*
(4AG-3.10)

Which type of network provides the greatest harmonic
suppression?

C. Pi-L-network
*
(4AG-4.1)

What are the three general groupings of filters?

A. High-pass, low-pass and band-pass
*
(4AG-4.2)

What is a constant-K filter?

C. A filter whose product of the series- and shunt-element
impedances is a constant for all frequencies
*
(4AG-4.3)

What is an advantage of a constant-k filter?

A. It has high attenuation for signals on frequencies far
removed from the passband
*
(4AG-4.4)

What is an m-derived filter?

D. A filter that uses a trap to attenuate undesired frequencies
too near cutoff for a constant-k filter.
*
(4AG-4.5)

What are the distinguishing features of a Butterworth filter?

C. It has a maximally flat response over its passband
*
(4AG-4.6)

What are the distinguishing features of a Chebyshev filter?

B. It allows ripple in the passband
*
(4AG-4.7)

When would it be more desirable to use an m-derived filter over
a constant-k filter?

B. When you need more attenuation at a certain frequency that is
too close to the cut-off frequency for a constant-k filter
*
(4AG-5.1)

What condition must exist for a circuit to oscillate?

C. It must have positive feedback sufficient to overcome losses
*
(4AG-5.2)

What are three major oscillator circuits often used in amateur
radio equipment?

D. Colpitts, Hartley and Pierce
*
(4AG-5.3)

How is the positive feedback coupled to the input in a Hartley
oscillator?

D. Through a tapped coil
*
(4AG-5.4)

How is the positive feedback coupled to the input in a Colpitts
oscillator?

C. Through a capacitive divider
*
(4AG-5.5)

How is the positive feedback coupled to the input in a Pierce
oscillator?

D. Through capacitive coupling
*
(4AG-5.6)

Which of the three major oscillator circuits used in amateur
radio equipment utilizes a quartz crystal?

D. Pierce
*
(4AG-5.7)

What is the piezoelectric effect?

A. Mechanical vibration of a crystal by the application of a
voltage
*
(4AG-5.8)

What is the major advantage of a Pierce oscillator?

B. It doesn't require an LC tank circuit
*
(4AG-5.9)

Which type of oscillator circuit is commonly used in a VFO?

B. Colpitts
*
(4AG-5.10)

Why is the Colpitts oscillator circuit commonly used in a VFO?

C. It is stable
*
(4AG-6.1)

What is meant by the term modulation?

D. A mixing process whereby information is imposed upon a
carrier
*
(4AG-6.2)

What are the two general categories of methods for generating
emission F3E?

B. The only way to produce an emission F3E signal is with a
reactance modulator on the oscillator
*
(4AG-6.3)

What is a reactance modulator?

C. A circuit that acts as a variable inductance or capacitance
to produce FM signals
*
(4AG-6.4)

What is a balanced modulator?

B. A modulator that produces a double sideband, suppressed
carrier signal
*
(4AG-6.5)

How can an emission J3E signal be generated?

D. By using a balanced modulator followed by a filter
*
(4AG-6.6)

How can an emission A3E signal be generated?

D. By modulating the plate voltage of a class C amplifier
*
(4AG-7.1)

How is the efficiency of a power amplifier determined?

A. Efficiency = (RF power out) / (DC power in) X 100%
*
(4AG-7.2)

For reasonably efficient operation of a vacuum tube Class C
amplifier, what should the plate-load resistance be with
1500-volts at the plate and 500-milliamperes plate current?

B. 1500 ohms
*
(4AG-7.3)

For reasonably efficient operation of a vacuum Class B
amplifier, what should the plate-load resistance be with
800-volts at the plate and 75-milliamperes plate current?

C. 6794 ohms
*
(4AG-7.4)

For reasonably efficient operation of a vacuum tube Class A
operation what should the plate-load resistance be with
250-volts at the plate and 25-milliamperes plate current?

A. 7692 ohms
*
(4AG-7.5)

For reasonably efficient operation of a transistor amplifier,
what should the load resistance be with 12-volts at the
collector and 5 watts power output?

B. 14.4 ohms
*
(4AG-7.6)

What is the flywheel effect?

B. The back and forth oscillation of electrons in an LC circuit
*
(4AG-7.7)

How can a power amplifier be neutralized?

C. By feeding back an out-of-phase component of the output to
the input
*
(4AG-7.8)

What order of Q is required by a tank-circuit sufficient to
reduce harmonics to an acceptable level?

B. Approximately 12
*
(4AG-7.9)

How can parasitic oscillations be eliminated from a power
amplifier?

C. By neutralization
*
(4AG-7.10)

What is the procedure for tuning a power amplifier having an
output pi-network?

D. Alternately increase the plate current with the loading
capacitor and dip the plate current with the tuning capacitor
*
(4AG-8.1)

What is the process of detection?

B. The recovery of intelligence from the modulated RF signal
*
(4AG-8.2)

What is the principle of detection in a diode detector?

A. Rectification and filtering of RF
*
(4AG-8.3)

What is a product detector?

C. A detector that uses a mixing process with a locally
generated carrier
*
(4AG-8.4)

How are emission F3E signals detected?

B. By a frequency discriminator
*
(4AG-8.5)

What is a frequency discriminator?

A. A circuit for detecting FM signals
*
(4AG-8.6)

What is the mixing process?

D. The combination of two signals to produce sum and difference
frequencies
*
(4AG-8.7)

What are the principal frequencies which appear at the output of
a mixer circuit?

C. The original frequencies and the sum and difference
frequencies
*
(4AG-8.8)

What are the advantages of the frequency-conversion process?

B. Increased selectivity and optimal tuned-circuit design
*
(4AG-8.9)

What occurs in a receiver when an excessive amount of signal
energy reaches the mixer circuit?

A. Spurious mixer products are generated
*
(4AG-9.1)

How much gain should be used in the RF amplifier stage of a
receiver?

B. Sufficient gain to allow weak signals to overcome noise
generated in the first mixer stage
*
(4AG-9.2)

Why should the RF amplifier stage of a receiver only have
sufficient gain to allow weak signals to overcome noise
generated in the first mixer stage?

C. To prevent the generation of spurious mixer products
*
(4AG-9.3)

What is the primary purpose of an RF amplifier in a receiver?

C. To improve the receiver's noise figure
*
(4AG-9.4)

What is an i-f amplifier stage?

A. A fixed-tuned pass-band amplifier
*
(4AG-9.5)

What factors should be considered when selecting an intermediate
frequency?

C. Image rejection and selectivity
*
(4AG-9.6)

What is the primary purpose of the first i-f amplifier stage in
a receiver?

D. Image rejection
*
(4AG-9.7)

What is the primary purpose of the final i-f amplifier stage in
a receiver?

B. Selectivity
*
(4AG-10.1)

What type of circuit is shown in Figure 4AG-10?

C. Common emitter amplifier
*
(4AG-10.2)

In Figure 4AG-10, what is the purpose of R1 and R2?

B. Fixed bias
*
(4AG-10.3)

In Figure 4AG-10, what is the purpose of C1?

D. Input coupling
*
(4AG-10.4)

In Figure 4AG-10, what is the purpose of C3?

D. Emitter bypass
*
(4AG-10.5)

In Figure 4AG-10, what is the purpose of R3?

D. Self bias
*
(4AG-11.1)

What type of circuit is shown in Figure 4AG-11?

B. Common-collector amplifier
*
(4AG-11.2)

In Figure 4AG-11, what is the purpose of R?

A. Emitter load
*
(4AG-11.3)

In Figure 4AG-11, what is the purpose of C1?

D. Collector bypass
*
(4AG-11.4)

In Figure 4AG-11, what is the purpose of C2?

A. Output coupling
*
(4AG-12.1)

What type of circuit is shown in Figure 4AG-12?

C. Linear voltage regulator
*
(4AG-12.2)

What is the purpose of D1 in the circuit shown in Figure 4AG-12?

B. Voltage reference
*
(4AG-12.3)

What is the purpose of Q1 in the circuit shown in Figure 4AG-12?

C. It increases the current handling capability
*
(4AG-12.4)

What is the purpose of C1 in the circuit shown in Figure 4AG-12?

D. It filters the supply voltage
*
(4AG-12.5)

What is the purpose of C2 in the circuit shown in Figure 4AG-12?

A. It bypasses hum around D1
*
(4AG-12.6)

What is the purpose of C3 in the circuit shown in Figure 4AG-12?

A. It prevents self-oscillation
*
(4AG-12.7)

What is the purpose of R1 in the circuit shown in Figure 4AG-12?

C. It supplies current to D1
*
(4AG-12.8)

What is the purpose of R2 in the circuit shown in Figure 4AG-12?

D. It provides a constant minimum load for Q1
*
(4AG-13.1)

What value capacitor would be required to tune a 20-microhenry
inductor to resonate in the 80 meter band?

C. 100 picofarads
*
(4AG-13.2)

What value inductor would be required to tune a 100-picofarad
capacitor to resonate in the 40 meter band?

D. 5 microhenrys
*
(4AG-13.3)

What value capacitor would be required to tune a 2-microhenry
inductor to resonate in the 20 meter band?

A. 64 picofarads
*
(4AG-13.4)

What value inductor would be required to tune a 15-picofarad
capacitor to resonate in the 15 meter band?

C. 4 microhenrys
*
(4AG-13.5)

What value capacitor would be required to tune a 100-microhenry
inductor to resonate in the 160 meter band?

A. 78 picofarads
*