Multivibrators and 555 Timer - General Questions (9)

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Multivibrators and 555 Timer - General Questions

65.

What is the duty cycle of the waveform at the output of the circuit given below?

mcq14_1032_1 (2)

A.	78%
B.	56%
C.	50%
D.	44%

Answer: Option B

Explanation:

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66.

Triggering a retriggerable one shot during pulse generation will:

A.	time out the original pulse
B.	extend the pulse to this trigger width
C.	have no effect
D.	double the original pulse width

Answer: Option B

Explanation:

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67.

What is the difference between a retriggerable one shot and a nonretriggerable one shot?

A.	The nonretriggerable can only be triggered once.
B.	The retriggerable can be triggered many times.
C.	The output pulse can be stretched with a nonretriggerable.
D.	The output pulse can be stretched with a retriggerable.

Answer: Option D

Explanation:

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68.

A monostable 555 timer has the following number of stable states:

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

Answer: Option B

Explanation:

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69.

In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the ________.

A.	value of the RC timing components
B.	amplitude of the input trigger
C.	frequency of the input trigger
D.	magnitude of the dc supply voltage

Answer: Option A

Explanation:

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70.

Does the 74123 one shot have an internal timing resistor?

A.	yes
B.	no

Answer: Option B

Explanation:

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71.

What controls the output pulse width of a one shot?

A.	the clock frequency
B.	the width of the clock pulse
C.	an RL time constant
D.	an RC time constant

Answer: Option D

Explanation:

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72.

Design a circuit using a 74121 to convert a 33-kHz, 30% duty cycle waveform to a 33-kHz, 60% duty cycle waveform.

A.	Rint = 2 k Cext = 0.012 nF
B.	Rint = 2 k Cext = 0.012 F
C.	Rint = 4 k Cext = 0.012 nF
D.	Rint = 4 k Cext = 0.012 F

Answer: Option B

Explanation:

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Multivibrators and 555 Timer - General Questions (9)

Multivibrators and 555 Timer - General Questions

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