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

Text File | 1992-10-04 | 11KB | 511 lines

;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
;                                                              :
;               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.
;
;
;
(4BG-1A.1)

What is a flip-flop circuit?

D. A binary sequential logic element with two stable states
*
(4BG-1A.2)

How many bits of information can be stored in a single flip-
flop circuit?

A. 1
*
(4BG-1A.3)

What is a bistable multivibrator circuit?

C. A flip-flop
*
(4BG-1A.4)

How many output changes are obtained for every two trigger
pulses applied to the input of a bistable T flip-flop circuit?

C. Two output level changes
*
(4BG-1A.5)

The frequency of an AC signal can be divided electronically by
what type of digital circuit?

C. A bistable multivibrator
*
(4BG-1A.6)

What type of digital IC is also known as a latch?

C. A flip-flop
*
(4BG-1A.7)

How many flip-flops are required to divide a signal frequency by
4?

B. 2
*
(4BG-1B.1)

What is an astable multivibrator?

D. A circuit that alternates between two unstable states
*
(4BG-1B.2)

What is a monostable multivibrator?

A. A circuit that can be switched momentarily to the opposite
binary state and then returns after a set time to its original
state
*
(4BG-1C.1)

What is an AND gate?

A. A circuit that produces a logic "1" at its output only if all
inputs are logic "1"
*
(4BG-1C.2)

What is the schematic symbol for an AND gate?

A
*
(4BG-1C.3)

What is a NAND gate?

D. A circuit that produces a logic "0" at its output only when
all inputs are logic "1"
*
(4BG-1C.4)

What is the schematic symbol for a NAND gate?

B
*
(4BG-1C.5)

What is an OR gate?

A. A circuit that produces a logic "1" at its output if any
input is logic "1"
*
(4BG-1C.6)

What is the schematic symbol for an OR gate?

D
*
(4BG-1C.7)

What is a NOR gate?

C. A circuit that produces a logic "0" at its output if any or
all inputs are logic "1"
*
(4BG-1C.8)

What is the schematic symbol for a NOR gate?

D
*
(4BG-1C.9)

What is a NOT gate?

A. A circuit that produces a logic "O" at its output when the
input is logic "1" and vice versa
*
(4BG-1C.10)

What is the schematic symbol for a NOT gate?

A
*
(4BG-1D.1)

What is a truth table?

C. A list of input combinations and their corresponding outputs
that characterizes a digital device's function
*
(4BG-1D.2)

In a positive-logic circuit, what level is used to represent a
logic 1?

D. A high level
*
(4BG-1D.3)

In a positive-logic circuit, what level is used to represent a
logic 0?

A. A low level
*
(4BG-1D.4)

In a negative-logic circuit, what level is used to represent a
logic 1?

A. A low level
*
(4BG-1D.5)

In a negative-logic circuit, what level is used to represent a
logic 0?

D. A high level
*
(4BG-2A.1)

What is a crystal-controlled marker generator?

D. A high-stability oscillator that generates a series of
reference signals at known frequency intervals
*
(4BG-2A.2)

What additional circuitry is required in a 100-kHz crystal-
controlled marker generator to provide markers at 50 and 25 kHz?

C. Two flip-flops
*
(4BG-2B.1)

What is the purpose of a prescaler circuit?

D. It divides an HF signal so a low-frequency counter can
display the operating frequency
*
(4BG-2B.2)

What does the accuracy of a frequency counter depend on?

A. The internal crystal reference
*
(4BG-2B.3)

How many states does a decade counter digital IC have?

B. 10
*
(4BG-2B.4)

What is the function of a decade counter digital IC?

B. Produce one output pulse for every ten input pulses
*
(4BG-3A.1)

What are the advantages of using an op-amp instead of LC
elements in an audio filter?

D. Op-amps exhibit gain rather than insertion loss
*
(4BG-3A.2)

What determines the gain and frequency characteristics of an
op-amp RC active filter?

B. Values of capacitances and resistances external to the op-amp
*
(4BG-3A.3)

What are the principle uses of an op-amp RC active filter in
amateur circuitry?

D. Op-amp circuits are used as audio filters for receivers
*
(4BG-3B.1)

What type of capacitors should be used in an op-amp RC active
filter circuit?

C. Polystyrene
*
(4BG-3B.2)

How can unwanted ringing and audio instability be prevented in a
multisection op-amp RC audio filter circuit?

A. Restrict both gain and Q
*
(4BG-3B.3)

Where should an op-amp RC active audio filter be placed in an
amateur receiver?

D. In the low-level audio stages
*
(4BG-3B.4)

What parameter must be selected when designing an audio filter
using an op-amp?

A. Bandpass characteristics
*
(4BG-4A.1)

What two factors determine the sensitivity of a receiver?

D. Bandwidth and noise figure
*
(4BG-4A.2)

What is the limiting condition for sensitivity in a
communications receiver?

A. The noise floor of the receiver
*
(4BG-4A.3)

What is the theoretical minimum noise floor of a receiver with a
400-Hertz bandwidth?

B. -148 dBm
*
(4BG-4B.1)

How can selectivity be achieved in the front-end circuitry of a
communications receiver?

B. By using a preselector
*
(4BG-4B.2)

A receiver selectivity of 2.4 kHz in the IF circuitry is optimum
for what type of amateur signals?

B. SSB voice
*
(4BG-4B.3)

What occurs during A1A reception if too narrow a filter
bandwidth is used in the IF stage of a receiver?

D. Filter ringing
*
(4BG-4B.4)

What degree of selectivity is desirable in the IF circuitry of
an amateur emission F1B receiver?

B. 300 Hz
*
(4BG-4B.5)

A receiver selectivity of 10 kHz in the IF circuitry is optimum
for what type of amateur signals?

B. Double-sideband AM
*
(4BG-4B.6)

What degree of selectivity is desirable in the IF circuitry of
an emission J3E receiver?

B. 2.4 kHz
*
(4BG-4B.7)

What is an undesirable effect of using too wide a filter
bandwidth in the IF section of a receiver?

B. Undesired signals will reach the audio stage
*
(4BG-4B.8)

How should the filter bandwidth of a receiver IF section compare
with the bandwidth of a received signal?

A. Filter bandwidth should be slightly greater than the
received-signal bandwidth
*
(4BG-4B.9)

What degree of selectivity is desirable in the IF circuitry of
an emission F3E receiver?

D. 15 kHz
*
(4BG-4B.10)

How can selectivity be achieved in the IF circuitry of a
communications receiver?

D. Incorporate a high-Q filter
*
(4BG-4C.1)

What is meant by the dynamic range of a communications receiver?

C. The ratio between the minimum discernible signal and the
largest tolerable signal without causing audible distortion
products
*
(4BG-4C.2)

What is the term for the ratio between the largest tolerable
receiver input signal and the minimum discernible signal?

D. Dynamic range
*
(4BG-4C.3)

What type of problems are caused by poor dynamic range in a
communications receiver?

A. Cross-modulation of the desired signal and desensitization
from strong adjacent signals
*
(4BG-4C.4)

The ability of a communications receiver to perform well in the
presence of strong signals outside the amateur band of interest
is indicated by what parameter?

B. Blocking dynamic range
*
(4BG-4D.1)

What is meant by the term noise figure of a communications
receiver?

C. The level of noise generated in the front end and succeeding
stages of a receiver
*
(4BG-4D.2)

Which stage of a receiver primarily establishes its noise
figure?

C. The RF stage
*
(4BG-5A.1)

What is an inverting op-amp circuit?

A. An operational amplifier circuit connected such that the
input and output signals are 180 degrees out of phase
*
(4BG-5B.1)

What is a noninverting op-amp circuit?

B. An operational amplifier circuit connected such that the
input and output signals are in phase
*
(4BG-5C.1)

What voltage gain can be expected from the circuit in Figure
4BG-5 when R1 is 1000 ohms and Rf is 100 kilohms?

D. 100
*
(4BG-5C.2)

What voltage gain can be expected from the circuit in Figure
4BG-5 when R1 is 1800 ohms and Rf is 68 kilohms?

C. 38
*
(4BG-5C.3)

What voltage gain can be expected from the circuit in Figure
4BG-5 when R1 is 3300 ohms and Rf is 47 kilohms?

B. 14
*
(4BG-5C.4)

What voltage gain can be expected from the circuit in Figure
4BG-5 when R1 is 10 ohms and Rf is 47 kilohms?

C. 4700
*
(4BG-5D.1)

How does the gain of a theoretically ideal operational amplifier
vary with frequency?

D. The gain does not vary with frequency
*
(4BG-6.1)

What determines the input impedance in a FET common-source
amplifier?

C. The input impedance is essentially determined by the gate
biasing network
*
(4BG-6.2)

What determines the output impedance in a FET common-source
amplifier?

A. The output impedance is essentially determined by the
resistor
*
(4BG-7.1)

What frequency range will be tuned by the circuit in Figure
4BG-7 when L is 10 microhenrys, Cf is 156 picofarads, and Cv is
50 picofarads maximum and 2 picofarads minimum?

A. 3508 through 4004 kHz
*
(4BG-7.2)

What frequency range will be tuned by the circuit in Figure
4BG-7 when L is 30 microhenrys, Cf is 200 picofarads, and Cv is
80 picofarads maximum and 10 picofarads minimum?

A. 1737 through 2005 kHz
*
(4BG-8.1)

What is the purpose of a bypass capacitor?

C. It removes alternating current by providing a low impedance
path to ground
*
(4BG-8.2)

What is the purpose of a coupling capacitor?

A. It blocks direct current and passes alternating current
*