Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which device is a type of
multivibrator?
a. | register | c. | flip-flop | b. | counter | d. | buffer |
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2.
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Which type of multivibrator has
two stable states?
a. | monostable | c. | bistable | b. | astable | d. | all of the above |
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3.
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Which type of multivibrator has
one stable state?
a. | astable | c. | monostable | b. | bistable | d. | all of the above |
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4.
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Which type of multivibrator has
no stable states?
a. | monostable | c. | bistable | b. | astable | d. | all of the above |
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5.
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An S-R flip-flop is one type of
________ multivibrator.
a. | monostable | c. | astable | b. | bistable | d. | unstable |
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6.
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A one-shot is another name for
the ________ multivibrator.
a. | bistable | c. | unstable | b. | astable | d. | monostable |
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7.
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Which of the three types of
multivibrators functions as a memory (storage) device?
a. | monostable | c. | bistable | b. | astable | d. | all of the above |
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8.
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Which of the three types of
multivibrators functions as a timing device?
a. | monostable | c. | astable | b. | bistable | d. | both bistable and astable |
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9.
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Which multivibrator can output
a single pulse whose width can be determined by the user?
a. | astable | c. | monostable | b. | bistable | d. | all of the above |
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10.
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Which components are added to a
monostable multivibrator to determine the specific time durations required at the
output?
a. | a resistor and a
capacitor | c. | two
resistors | b. | an AND gate and an OR gate | d. | a resistor and a diode |
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11.
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Which internal circuit is used
to determine when a 555 timer changes states?
a. | a voltage
comparator | c. | a
buffer | b. | a flip-flop | d. | an RC network |
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12.
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In astable operation, the time
period of the 555 timer output is expressed as
a. | tw =
R(.693) | c. | tw = tLO +
tHI | b. | tw = RextCext | d. | tw = Rext + Rint |
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13.
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A 555 timer in astable
operation uses two timing resistors, RA and RB. Which one is used to calculate time HIGH
(tHI)?
a. | RA | c. | both RA and RB | b. | RB | d. | neither RA nor RB |
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14.
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Which formula is correct when
calculating time LOW (tLO) for an astable 555 timer output?
a. | tLO =
RARB(.693) | c. | tLO =
RBC | b. | tLO = RB(.693) | d. | tLO = RBC(.693) |
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15.
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Which formula is correct when
calculating time HIGH (tHI) for an astable 555 timer output?
a. | tHI = (RA +
RB)C(.693) | c. | tHI =
RARB(.693) | b. | tHI = RA(.693) | d. | tHI = RBC(.693) |
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16.
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An astable 555 timer is
designed using the following external components: RA = 2 kÙ, RB = 6.5 kÙ , C = .01 ìF. Calculate time LOW (tLO).
a. | 550 ìsec | c. | 105
ìsec | b. | 45 ìsec | d. | 325 msec |
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17.
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An astable 555 timer is
designed using the following external components: RA = 2 kÙ , RB = 6.5 kÙ , C = .01 ìF. Calculate time HIGH (tHI).
a. | 59 ìsec | c. | 550
ìsec | b. | 325
msec | d. | 40 ìsec |
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18.
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If the output of an astable 555 timer is LOW for
716 ìs and HIGH for 13.7 ms, the duty cycle is
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19.
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If the output of an astable 555
timer is LOW for 45 ms and HIGH for 59 ms, the duty cycle is
a. | 56.7% | c. | 67.8% | b. | 77.4% | d. | 85% |
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20.
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A monostable 555 timer is
designed using the following external components: RA = 47 kÙ, C = 2.2 ìF. What is
the pulse width (tw) of the output?
a. | 114 ms | c. | 65 ms | b. | 3.7 ms | d. | 24 ms |
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