WatElectronics.com

You are here: Home / MCQ / Multivibrator Question & Answers

Multivibrator Question & Answers

By

This article lists 100 Multivibrator MCQs for engineering students. All the Multivibrator Questions & Answers given below includes solution and link wherever possible to the relevant topic.

A sequential logic circuit utilized in building up complex circuitry can be a Counter, Latch, and Memories. These circuits must be provided with a timing or clock signal to make them function sequentially. This type of Single Pulse Generator circuit is known as a Multivibrator.

1). Multivibrators are also referred to as ______.
HintElectronic circuit that can generate rectangular, pulse and square waveforms
2). Which feedback does a multivibrator have?
HintTwo circuits of amplifiers
3). What are the types of Multivibrators?
HintPresence of Stable states multivibrators are classified into three types
4). Astable Multivibrators has ________ Stable states.
HintNo Stable states
5). Which multivibrators consist of One Stable state?
HintMonostable multivibrators require external triggering
6). What type of Multivibrator can produce only one Single pulse?
HintEither positive or negative pulse
7). How many states does a Bistable Multivibrator possess?
HintBistable multivibrators generate either a negative or the positive value pulse
8). What do you mean by Quasi stable?
HintTemporary state of stability
9). What are the elements used for coupling in Bistable Multivibrators?
HintDc coupling
10). What type of multivibrator needs triggering for Reverse transition?
HintTransition of one stable state to another
11). Astable multivibrators can function as ______________.
HintAstable multivibrators are unable to maintain stability in any of the states and continue to switch
12). Which Multivibrator is known as Flip-flop Multivibrator?
HintFlip-flops
13). What are the other names of Bistable multivibrators?
HintFlip-flops possess two ‘stable’ states
14). Monostable multivibrator is also known as ___________.
HintNo output is produced until it is triggered
15). Why the Monostable Multivibrator referred to as Delay circuit?
HintThe time-lapse required for the transition of a Quasi-stable state to a Stable state is pre-determined
16). Bistable Multivibrators is known as _________.
HintTwo states are stable in Bistable multivibrators
17). How do Multivibrators differ from Oscillators?
HintType of waveform produced
18). Why a Flip-flop Multivibrator is termed as Two-shot Multivibrator?
HintTwo-shot Multivibrator
19). How many trigger pulses required for Bistable multivibrators?
HintTwo pulses are required for triggering
20). Which of these multivibrator produces square wave as the outcome?
HintSquare wave generator
21). Duty cycle of an Astable multivibrator is ________.
HintSquare pulses
22). What kind of multivibrators have equal time for a capacitor to charge and discharge?
HintTime for the capacitor to charge and discharge is equivalent in Astable multivibrators
23). How many stages of amplifier present in Astable Multivibrator?
HintBoth the stages of amplifiers are cross-coupled to each other
24). Which is the feedback present in Astable multivibrators?
HintPositive feedback is very strong in Astable multivibrators
25). Which of the below circuit has a Quasi stable state?
HintMonostable multivibrator has two states

Multivibrators Important Questions for Interviews

26). What does a symmetrically coupled collector circuit consists of?
HintRC coupled stages of amplifiers
27). What happens to the signal when passed through Common-emitter amplifier’s first stage?
HintPhase gets reversed
28). Multivibrators output is collected from ___________ of any transistor.
HintCollector-coupled multivibrator
29). How the transistors Q1 and Q2 alternates in the multivibrator circuit?
HintOne transistor is  ON the other remains in OFF
30). Total time period of the Square wave is ________.
HintDouble of 0.69 RC
31). How the frequency can be determined for the oscillations?
HintReciprocal of the total time interval
32). Which is known as Free-running Multivibrator?
HintAn astable circuit is capable of generating output without any need for external excitations
33). How frequency at the output can be varied in Astable multivibrator circuit?
HintChange in the capacitor and the resistor
34). What is the main application of a Monostable multivibrator?
HintTime interval in the Monostable circuit is set manually
35). What happens to the Monostable circuit when it is triggered externally?
HintQuasi-stable from Stable
36). Monostable circuit from state of Quasi-stable will return to Stable by _________.
HintA monostable circuit is triggered once
37). On what factor the time interval in the Multivibrator circuit depend?
HintPassive components
38). What happens to the Monostable circuit if it is not triggered externally?
HintOne transistor will be at Saturation and the other at Cut-off
39). What are the applications of a Monostable circuit?
HintTimers, Delay circuits
40). The cycle to charge a capacitor is __________ than a cycle of discharge in Astable multivibrator.
HintAstable multivibrators
41). Which of these multivibrators are preferred for lower clock frequencies?
HintFrequently switching characteristics Astable multivibrators
42). What kind of Multivibrator have two networks of RC?
HintAstable circuit has two RC networks cross-coupled
43). Monostable multivibrator consists of _________.
HintHalf Astable multivibrator
44). Which multivibrators have only Resistive coupling?
HintBistable circuits of multivibrators
45). Which multivibrators need external triggering to operate?
HintAutomatic triggering
46). What does a Astable multivibrator comprise of?
HintCross-coupled switching transistor circuit
47). How many capacitors present in Astable circuit?
HintTwo capacitors to delay time
48). What kind of multivibrator preferred in Flash lights?
Hint A square wave is generated at output continuously
49). On what factors the output wave generated is dependent on?
HintRC (feedback) network
50). Which is the most commonly preferred circuit of Multivibrators?
HintAstable is the most simple and easy while implementing

Multivibrator Question & Answers

51). What can improve the switching capability in Bistable multivibrators?
HintCommutating capacitors in Bistable circuit

Read More About Flip-Flops

52).What reduces the time of transition in Bistable multivibrator?
HintCapacitors reduces the time required to transfer the conduction of the current
53). Commutating capacitors are also referred to as ________ capacitors.
HintReduce time in transition the processing speed gets enhanced
54). What multivibrator is chosen for counting applications?
HintFlip-flops used in counting applications
55). Which is the costliest multivibrator?
HintBistable multivibrator is expensive
56). What is the disadvantage of Bistable circuit?
HintTriggering is required for the transition of states
57). Frequency divider application uses _________.
HintBistable circuit divides the frequency at input
58). Which of the multivibrator are known for repairing damaged pulses?
Hint A monostable circuit can be used as input to the ‘Pulse Generator circuits’
59). Which of the multivibrator chosen to function as Linear Ramp Generator?
HintAdditional source of Constant current Monostable circuit
60). Which state the Bistable circuit will be without trigger?
HintBistable circuit stays at Low state
61). What happens to the Bistable circuit at High state when the Reset is applied?
HintBistable circuit makes it change to a Lower state
62). What are the multivibrators constructed using 555 Timer?
HintAll the types of Multivibrators
63). How many comparators are present in Timer 555?
HintUpper and Lower comparators
64). Which is the most simple circuit constructed using Timer 555?
HintBistable circuit without any required RC external network
65). In which applications 555 timer can be used?
Hint555 is used to function as a timer commercially
66). What are the components connected to timer 555 to function it as Astable multivibrator?
HintA capacitor and two resistors connected externally
67). How Pulse position modulation is achieved using 555 Timer?
HintTwo Timers of 555 Integrated circuits
68). Why 555 Integrated circuit used in the multivibrators?
HintEasy availability
69). To achieve PPM the first 555 IC will be operated in __________ mode.
Hint555 IC functioning in Astable mode
70). To which pin modulation signal is applied in 555 Timer?
HintPin 5 of the 555 IC
71). From which of the pins the output of PPM can be collected?
HintPPM wave can be collected from Pin 3
72). How the time constant of a capacitor to charge and discharge related in Astable 555 circuit?
HintThe time constant of the capacitor to charge is greater
73). High output stays __________ in comparison with the Low Output in Astable circuit.
HintHigher output stays longer in duration
74). What is the characteristic of the output obtained by Astable circuit?
HintAstable circuit is Asymmetric
75). What do you define as TON / T?
HintDuty cycle for the High output

Multivibrators MCQs with Answers

76). T in the duty cycle stands for _______.
HintT = TON + TOFF
77). How can you define Duty cycle?
HintRelationship between the High and the Low outcomes
78). How the charging time TC calculated in 555 Astable circuit?
HintDependent on Resistors and Capacitors
79). What is the discharge timing of an Astable circuit of 555?
HintDischarge timing can be calculated based on the resistor R2
80). What is the component connected to 555 circuit to obtain Frequency Modulation?
HintModulation signal is applied it passes through an HPF
81). Which device connected Astable circuit to achieve FM?
HintTo the Resistor (R2) diode connected in a parallel manner
82). Astable circuit to achieve FM’s Modulation signal voltage and time period are ______.
HintModulation signal has a higher voltage the time interval of the obtained signal at output is higher
83). Can an Astable multivibrator able to generate pulse of various widths?
HintReplacing a resistor with a potentiometer
84). What sets the voltage to high in Monostable circuit?
HintFalling edge at Pin 2
85). What are the components necessary to make 555 as Monostable circuit?
HintTwo components
86). In Linear ramp generation circuit what is used as constant source of current?
HintLinear ramp generator a constant source of current must be added
87). What circuit is used as a missing pulse detector?
HintMonostable circuit with certain addition of components
88). What components can make Monostable circuit as Missing pulse detector?
HintA transistor (PNP) connected over a capacitor externally
89). What type of wave is generated by Free-running Multivibrators?
HintA free-running multivibrator
90). Which circuit is referred to as Pulse Generator Circuit?
HintMultivibrators are known for generating pulses
91). Which multivibrators are used as Memory elements?
HintFlip-flops
92). Discharge time of a capacitor in a Monostable circuit is termed as _________ time.
HintRecovery time
93). Which element in Monostable circuit of CMOS prevent rising of input signal?
HintCapacitors are used in the Monostable circuit made of CMOS
94). The output finite resistance in the Astable circuit of CMOS can be ______.
HintAstable circuit of CMOS can be neglected
95). Which type of Multivibrator generates Clock pulse?
HintMonostable multivibrators
96). Bistable multivibrator is a _______.
HintFlip-flop
97). What is the outcome of the Schmitt trigger?
HintSchmitt triggers
98). What are the components required in building Op-amp based Astable circuit?
HintOp-amp with resistor-capacitor and diode
99). A Monostable circuit with resistance (R) 100 Kilo ohms with a Time delay (T) of 1000 milliseconds. Find the Capacitor value?
HintDelay in Monostable multivibrator can be calculated by 1.1 RC.
100). A Monostable circuit with resistance (R) as 100 kilo ohms and capacitor (C) as 10 micro farads calculate the Time delay?
HintDelay in Monostable multivibrator can be calculated by 1.1 RC.

ABOUT