Multivibrators and 555 Timer - General Questions (10)

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Multivibrators and 555 Timer - General Questions

73.

If a diode is connected across resistor R_B (positive end up) in the given figure, what is the new duty cycle of the output waveform?

mcq14_1032_1 (1)

A.	56%
B.	44%
C.	21.6%
D.	17.4%

Answer: Option C

Explanation:

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74.

The output of the astable circuit ________.

A.	constantly switches between two states
B.	is LOW until a trigger is received
C.	is HIGH until a trigger is received
D.	floats until triggered

Answer: Option A

Explanation:

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75.

Determine t_HI and t_LO for the circuit given below.

mcq14_1032_1

A.	tHI = 7.95 s, tLO = 6.24 s
B.	tHI = 6.24 s, tLO = 7.95 s
C.	tHI = 3.97 s, tLO = 3.21 s
D.	tHI = 3.21 s, tLO = 3.97 s

Answer: Option A

Explanation:

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76.

Is there any limit to the number of times that a 74123 can be retriggered?

A.	yes
B.	no

Answer: Option B

Explanation:

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77.

What is the difference between an astable multivibrator and a monostable multivibrator?

A.	The astable is free running.
B.	The astable needs to be clocked.
C.	The monostable is free running.
D.	none of the above

Answer: Option A

Explanation:

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78.

A crystal demonstrates the ________ effect when a mechanical force across the crystal causes a small voltage to be generated.

A.	photoelectric
B.	Co-pitts
C.	piezoelectric
D.	flywheel

Answer: Option C

Explanation:

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79.

An astable multivibrator requires:

A.	balanced time constants
B.	a pair of matched transistors
C.	no input signal
D.	dual J-K flip-flops

Answer: Option C

Explanation:

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80.

With most monostable multivibrators, what is the Q output when no input trigger has occurred?

A.	LOW
B.	+5 V
C.	SET
D.	HIGH

Answer: Option A

Explanation:

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Multivibrators and 555 Timer - General Questions (10)

Multivibrators and 555 Timer - General Questions

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