Multivibrators and 555 Timer - General Questions (7)

Directions to Solve

Multivibrators and 555 Timer - General Questions

49.

This program code will be executed continuously:

STAT:	MOV A, #01H
	JNZ STAT

A.	True
B.	False

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

50.

The internal RAM memory of the 8051 is:

A.	32 bytes
B.	64 bytes
C.	128 bytes
D.	256 bytes

Answer: Option C

Explanation:

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51.

If the resistor in the Schmitt trigger astable multivibrator is a variable resistor, what part of the output voltage waveform will change when the resistance is changed?

A.	the shape of the waveform
B.	the amplitude of the waveform
C.	the period of the waveform
D.	none of the above

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

52.

If V_cc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?

A.	VOH = 10 V, VOL = 0 V
B.	VOH = 10 V, VOL = 0.1 V
C.	VOH = 8.5 V, VOL = 0 V
D.	VOH = 8.5 V, VOL = 0.1 V

Answer: Option D

Explanation:

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53.

The pulse width out of a one-shot multivibrator increases when the:

A.	supply voltage increases
B.	timing resistor decreases
C.	UTP decreases
D.	timing capacitance increases

Answer: Option A

Explanation:

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54.

What is the output pulse width of the waveform at the output of the circuit in the given figure?

mcq14_1036_1 (1)

A.	1.65 ms
B.	18.2 ms
C.	4.98 ms
D.	54.6 ms

Answer: Option B

Explanation:

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55.

Which of the following is NOT a characteristic of a retriggerable monostable multivibrator?

A.	It is a dual multivibrator.
B.	It has an active-HIGH reset, which terminates all timing functions.
C.	It has no internal timing resistor.
D.	none of the above

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

56.

Is the circuit given below an astable multivibrator or a monostable multivibrator?

mcq14_1036_1

A.	monostable
B.	astable

Answer: Option A

Explanation:

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Multivibrators and 555 Timer - General Questions (7)

Multivibrators and 555 Timer - General Questions

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