Why is it called a 555 timer?

1 Answer

Answer :

Because it have three 5k Ohm resistances.

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Description : What is the use of 555 timer?

Last Answer : 555 IC timer is use in timers and oscillators.

Description : What is the difference between a counter and a timer?

Last Answer : Counter counts only when the trigger is applied and timer counts continuously with some equal delay.

Description : What is IC 555?

Last Answer : Ic 555 is timer used for indicating time intervals which is settled in ic 

Description : How to Install a Timer Switch

Last Answer : How to Install a Timer Switch A timer switch is a handy device that automatically turns off a switch after a fixed period of time. This is particularly useful when you have kids at home ... safety precautions when installing switches or anything that might put you in the direct path of electricity.

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Description : What is watchdog timer ? Explain the implementation of time out for ATM with block diagram and program.

Last Answer : A special type of timer is a watchdog timer, which will reset the system after a predefined timeout. Watchdog timer reset timer every X time unit, else timer generates a signal ... be loaded into timereg. This is to prevent erroneous software from unintentionally resetting the watchdog timer.

Description : I need a schematic...

Last Answer : Look here—a variety of schematics on this page. http://en.wikipedia.org/wiki/555_timer_IC

Description : List the applications of 555 timer in Astable mode of operation

Last Answer : *FSK generator  *Pulse-position modulator

Description : List the applications of 555 timer in monostable mode of operation

Last Answer : *missing pulse detector *Linear ramp generator *Frequency divider *Pulse width modulation.

Description : Mention some applications of 555 timer

Last Answer : *Oscillator *pulse generator *ramp and square wave generator *mono-shot multivibrator *burglar alarm *traffic light control.

Description : Which of the following are the basic elements in a 555 timer IC? (a) Two comparators (b) A flip-flop (c) A discharge transistor (d) A resistive voltage divider  A) (a), (b) and (d) B) only (a), (b) and (c) C) only (b), (c) and (d) D) only (a), (b), (c) and (d)

Last Answer : Which of the following are the basic elements in a 555 timer IC? (a) Two comparators (b) A flip-flop (c) A discharge transistor (d) A resistive voltage divider  A) (a), (b) and (d) B) only (a), (b) and (c) C) only (b), (c) and (d) D) only (a), (b), (c) and (d)

Description : The output waveform of a 555 Timer is: (1) Sinusoidal (2) Triangular (3) Rectangular (4) Elliptical 

Last Answer : The output waveform of a 555 Timer is: Rectangular

Description : The 555 timer can be used in which of the following configurations ?  a) astable, monostable b) monostable, bistable c) astable, toggled d) bistable, tristable

Last Answer : The 555 timer can be used in astable, monostable configurations.

Description : Timer IC 555 has no pin for  A) Threshold B) Set C) Trigger D) Control

Description : What does the discharge transistor do in the 555 timer circuit?  (A) Discharge the external capacitor to stop the timing (B) Charge the external capacitor to stop the timing (C) ... capacitor to start the timing over again (D) Charge the external capacitor to start the timing over again

Description : Explain the function of sample and hold circuit by using op-amp.

Last Answer : sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

Description : Define roll of rate and order of filter.

Last Answer : 1. Roll of rate is the rate of change of gain with frequency. Roll of rate is always measured in dB/decade. 2. The roll of rate is called the order of the filter. It depends on the rate at which filter ... rate is -40 dB / decade or +40 db / decade then the filter is of 2nd order and so on

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Description : State the four applications of an instrumentation amplifier.

Last Answer : The instrumentation amplifier can be used for other application such as 1. Electronic weighing machine scale 2 .Light, intensity meter 3. Pressure monitoring & controlling 4. Temperature monitoring and controlling. 5. Process Instrumentation in measurement of physical quantities.

Description : What is the threshold voltage?

Last Answer : 440

Description : Complete the following sequence: 9 × 111 = 999 9 × 222 = 1998 9 × 333 = 2997 9 × 444 = ______ 9 × 555 = ______ 9 × 666 = ______

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Description : How do you round 555.55 to the nearest tenth?

Last Answer : 555.6

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : He sent 555 players back to the pavilion just 281 innings of 147 test matches and proved himself No. 1 wicket keeper: A. Boucher (SA) B. Gilchrist (Aus) C. Healy (Aus) D. Stewart (Eng)

Last Answer : ANSWER: A

Description : When a voltage of 124 VDC is applied to the illustrated circuit with a resistance of 17.8 ohms the current will be ________. EL-0018 A. 0.143 amps B. 2.555 amps C. 6.966 amps D. 141.8 milliamps

Last Answer : Answer: C

Description : 355. A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 ... to cool to 60°C is (A) 555 (B) 55.5 (C) 0.55 (D) 0.15

Description : The following are true about spectral sensitivity of the retina: a. in scotopic conditions, the peak sensitivity of the eye is near 500 nm b. under photopic conditions the peak sensitivity is near 555 nm c ... light the retina has a peak sensitivity near 440 nm to a 25-Hz stimulus d. all above

Last Answer : all above

Description : The following are true about spectral sensitivity of the retina: a. in scotopic conditions, the peak sensitivity of the eye is near 500 nm b. under photopic conditions the peak sensitivity is near 555 nm c ... light the retina has a peak sensitivity near 440 nm to a 25-Hz stimulus d. all above

Description : The following are true about spectral sensitivity of the retina: a. in scotopic conditions, the peak sensitivity of the eye is near 500 nm b. under photopic conditions the peak sensitivity is near 555 nm c ... light the retina has a peak sensitivity near 440 nm to a 25-Hz stimulus d. all above

Description : True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

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Description : 3√7469 x √668 = ? a) 450 b) 300 c) 505 d) 465 e) 555

Last Answer : 3√7469 × √668 = ? = 19.5 × 25.9 = 505.05 = 505 (approx) Answer: c)

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Description : The Octal number to be given alogn with chmod command to make a file readable, writable and executable to the owner, readable and executable to group and others is: A. 000 B. 755 C. 744 D. 555 E. None of the above

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Description : The average of the 3 digit number, which remain the same when the digits interchange their positions is. A) 444 B) 555 C) 666 D) 777 

Last Answer : B) Average = (111+222+333+444+555+666+ 777+888+999)/9 =(111+999)+(222+888)+ (333+777)+(444+666)+ 555/9 =(4*1110)+555/9 =4440 + 555/9 =4995/9 =555.