25 Questions
Match the following IC 555 pins with their functions:
Pin-6 = Non-inverting terminal of the upper comparator Pin-7 = Collector of the discharge transistor Pin-8 = Positive supply voltage connection
Match the following IC 555 pins with their functionalities in a monostable multivibrator:
Pin-6 = Setting the flipflop and making the timer output low Pin-7 = Discharging the external capacitor Pin-8 = Connection for positive supply voltage
Match the following applications with their corresponding use of IC 555:
Monostable multivibrator = Functioning as a one-shot multivibrator Astable multivibrator = Generating continuous square wave signals Pulse Width Modulator (PWM) = Regulating the width of output pulses Voltage Controlled Oscillator = Producing frequency-modulated signals
Match the following modulators with their applications using IC 555:
Pulse Amplitude Modulator (PAM) = Not mentioned in IC 555 applications Pulse Position Modulator (PPM) = Not mentioned in IC 555 applications Frequency-Shift Keying (FSK) = Not mentioned in IC 555 applications Ramp Generator = Not mentioned in IC 555 applications
Match the following electronic processes with their corresponding timing circuits:
TV sleep timer = IC-555 Washing machine timer = IC-555 Traffic signaling timer = IC-555 Industrial heating timer = IC-555
Match the following applications with the correct use of IC-555:
Burglar alarms = IC-555 Voltage control oscillators = IC-555 Ramp generators = IC-555 Styling web pages = CSS
Match the following components with their functions in IC-555:
Comparators (using op-amp) = IC-555 RS flip-flop = IC-555 Discharge transistor = IC-555 Multiplexer = SQL
Match the following supply voltage ranges with the operating range of IC-555:
+5V to +18V = IC-555 +3.3V only = JavaScript +12V to +24V = Python +1.5V to +4.5V = CSS
Match the following terms with their corresponding meanings:
Monostable multivibrators = IC-555 applications Astable multivibrators = Electronic systems Waveform generators = Voltage control oscillators Database queries = SQL
Match the following pin functions with their descriptions in IC-555:
Pin-1: Ground = Reference or ground point of the IC Pin-2: Vcc = +5V to +18V supply voltage range Pin-3: Output = Output signal of the IC Pin-4: Reset = Reset input for the IC
Match the following components with their functions in an astable multivibrator using IC-555:
Lower comparator = Resetting the flip-flop when capacitor voltage is less than VCC/3 Upper comparator = Setting the flip-flop when capacitor voltage reaches 2VCC/3 Transistor = Cutting off during the charging phase and saturating during the discharging phase Capacitor = Charging through series resistors during the charging time and discharging through RB during the discharging time
Match the following actions with their effects on the timer output of an astable multivibrator using IC-555:
Lower comparator output goes high = Resets the flip-flop, making the timer output go high Upper comparator provides a high output = Sets the flip-flop, making the timer output go low Transistor saturates = Output goes to a low state Capacitor starts discharging through RB and the transistor = Leads to the timer output going high after reaching VCC/3
Match the following pin connections of IC-555 with their purposes in an astable multivibrator circuit:
Pin-4 connected to supply voltage = Power supply connection Pin-5 bypassed to ground through a capacitor = Noise filtering from the control voltage External components connected to Pin-5 = Capacitor of 0.01 μF for noise filtration Internal components of IC 555 not shown = Only external components shown in schematic diagram
Match the following time periods with their definitions in an astable multivibrator using IC-555:
Charging time (tc) = Time during which the timer output is high Discharging time (td) = Time during which the timer output is low Total time period (T) = Sum of charging time and discharging time Capacitor charges from VCC/3 to 2VCC/3 = Charging phase of the capacitor
Match the following terms with their correct formulas:
ON TIME (tON) = 0.693 (RA + RB) C OFF TIME (tOFF) = 0.693 RB C Total time period (T) = 0.693 (RA + 2RB) C Duty Cycle (D) = tON / T
Match the following expressions with their meanings:
tOFF = td = Discharging time Duty Cycle = D = Ratio of on time to total time period f = 1 / T = Frequency of oscillation T = tc + td = Total time period of the output waveform
Match the applications with the correct usage of Astable multivibrator:
Square wave oscillator = Produces continuous train of rectangular pulses Free running ramp generator = Can be used as clock signal in digital circuits Voltage control oscillator (VCO) = One of the applications of Astable multivibrator Clock signal in digital circuits = Generated by Astable multivibrator
Match the following voltages with their corresponding levels during discharging:
2VCC/3 = Initial voltage level during discharging VCC/3 = Final voltage level during discharging VCC = Voltage level not mentioned in discharging process 3VCC/2 = Voltage level not mentioned in discharging process
Match the components with their roles in the circuit:
RA = Affects the timing of ON TIME and frequency of oscillation RB = Affects the timing of OFF TIME and duty cycle C = Capacitance value influencing time periods 1.44 = Constant factor in calculating frequency
Match the application with the correct description:
Frequency divider = Divides input frequency by a certain factor Pulse width modulator = Modulates the width of input pulses PAM and PPM (pulse position modulator) = Modulates pulse position for analog and digital signals Trigger circuit for providing ‘gating pulse’ in digital systems = Generates pulse for gating in digital circuits
Match the expression with the correct variable:
vc = VCC (1 – e^(-t/RC)) = Voltage across capacitor during charging tp = RC log_e(1/3) = Time taken by capacitor to charge from 0 to 2VCC/3 (2VCC - VCC) = VCC(1 - e^(-tp/3RC)) = Equation for capacitor voltage reaching 2VCC/3 tp = 1.1 RC = Formula for varying ON TIME by changing R or C or both
Match the multivibrator type with its characteristic:
Monostable multivibrator = Has one stable state and changes to unstable state after a trigger Astable multivibrator = Does not have any stable state and changes states periodically Free-running multivibrator = Operates without external trigger to change output state Bistable multivibrator = Has two stable states and can remain in either until triggered
Match the IC-555 configuration with its operation:
Monostable operation = Produce a single pulse of a specified duration upon trigger Astable operation = Generate continuous square wave output without external triggering Bistable operation = Remain in one of two stable states until triggered to switch
Match the components with their impact on ON TIME:
Changing R = Varies the charging rate of the capacitor Changing C = Alters the capacity of the capacitor affecting charging time Changing both R and C = Combined effect on charging time and ON TIME Maintaining constant R and C = Keeps ON TIME consistent over multiple cycles
Match the terms with their meanings:
Threshold input (pin 6) = 'Set' voltage level that triggers a change in output state Trigger input (pin 2) = 'Reset' voltage level that initiates a change in output state Stable state = State where output remains until an external trigger is received Unstable state = 'Transient' state that changes periodically without external triggers
Learn about the various applications of a monostable multivibrator including frequency division, pulse width modulation, and pulse position modulation. Understand the expression for the ON TIME (Pulse width) and how it relates to the charging time of the capacitor in the circuit.
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