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Multivibrators and 555 Timer - General Questions (8)

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Multivibrators and 555 Timer - General Questions

57. 

A 0.3-mu (2)3F capacitor has an initial charge of 2.7 V. If it is discharged through a 10-k resistor for 6.5 ms, how much voltage will be left across the capacitor?

A. 0.0 V
B. 0.309 V
C. 2.7 V
D. 2.295 V

Answer: Option B

Explanation:

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58. 

Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?

A. monostable
B. pulse stretching
C. Schmitt triggering
D. astable

Answer: Option D

Explanation:

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59. 

An astable 555 timer has the following number of stable states:

A. 0
B. 1
C. 2
D. 3

Answer: Option A

Explanation:

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60. 

What is another name for a bistable multivibrator?

A. an on-off switch
B. an oscillator
C. a flip-flop

Answer: Option C

Explanation:

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61. 

To obtain a 50% duty cycle in an astable 555 timer circuit:

A. tLO = tHI
B. RA = RB and short RB with a diode during the capacitor charging cycle
C. capacitor voltage must rise above 1/3 VCC
D. tLO = tHI, RA = RB, and short RB with a diode during the capacitor charging cycle

Answer: Option A

Explanation:

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62. 

What is the pulse width of the output of a 74123 if an external 4.7-k resistor and a 0.022-F capacitor are used?

A. 290 ms
B. 29 ms
C. 33.3mu (2)3
D. 290mu (2)3

Answer: Option C

Explanation:

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63. 

A retriggerable one shot has a pulse of 10 ms. 3 ms after being triggered, another trigger pulse is applied. The resulting output pulse will be ________ ms.

A. 3
B. 7
C. 10
D. 13

Answer: Option D

Explanation:

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64. 

The monostable multivibrator circuit is not an oscillator because ________.

A. its output switches between two states
B. it requires a trigger to obtain an output signal
C. it requires a sine wave input signal
D. the circuit does not require a dc power supply

Answer: Option B

Explanation:

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