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MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1.  What is the function of the comparators in the 555 timer circuit?
  1.    to compare the output voltages to the internal voltage divider
  2.    to compare the input voltages to the internal voltage divider
  3.    to compare the output voltages to the external voltage divider
  4.    to compare the input voltages to the external voltage divider
 Discuss Question
Answer: Option B. -> to compare the input voltages to the internal voltage divider
Question 2.  The ________ is defined as the time the output is active divided by the total period of the output signal.
  1.    on time
  2.    off time
  3.    duty cycle
  4.    active ratio
 Discuss Question
Answer: Option C. -> duty cycle
Question 3.  When a capacitor charges:
  1.    the voltage across the plates rises exponentially
  2.    the circuit current falls exponentially
  3.    the capacitor charges to the source voltage in 5×RC seconds
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 4.  A 22-k resistor and a 0.02-F capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
  1.    0.44 ms
  2.    0.501 ms
  3.    0.66 ms
  4.    0.70 ms
 Discuss Question
Answer: Option B. -> 0.501 ms
Question 5.  What does the discharge transistor do in the 555 timer circuit?
  1.    charge the external capacitor to stop the timing
  2.    charge the external capacitor to start the timing over again
  3.    discharge the external capacitor to stop the timing
  4.    discharge the external capacitor to start the timing over again
 Discuss Question
Answer: Option D. -> discharge the external capacitor to start the timing over again
Question 6.  
The internal circuitry of the 555 timer consists of ________, an R-S flip-flop, a transistor switch, an output buffer amplifier, and a voltage divider.
  1.    a comparator
  2.    a voltage amplifier
  3.    two comparators
  4.    a peak detector
 Discuss Question
Answer: Option C. -> two comparators
Question 7.  Pulse stretching, time-delay, and pulse generation are all easily accomplished with which type of multivibrator circuit?
  1.    astable
  2.    monostable
  3.    multistable
  4.    bistable
 Discuss Question
Answer: Option B. -> monostable
Question 8.  With most monostable multivibrators, what is the Q output when no input trigger has occurred?
  1.    LOW
  2.    +5 V
  3.    SET
  4.    HIGH
 Discuss Question
Answer: Option A. -> LOW
Question 9.  An astable multivibrator requires:
  1.    balanced time constants
  2.    a pair of matched transistors
  3.    no input signal
  4.    dual J-K flip-flops
 Discuss Question
Answer: Option C. -> no input signal
Question 10. . What controls the output pulse width of a one shot?
  1.    the clock frequency
  2.    the width of the clock pulse
  3.    an RL time constant
  4.    an RC time constant
 Discuss Question
Answer: Option D. -> an RC time constant

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