1. The 555 timer IC is widely used for which type of applications?
(A) Timing and waveform generation
(B) Voltage regulation
(C) Power amplification
(D) Signal demodulation
2. The 555 timer was invented by:
(A) Hans Camenzind
(B) Jack Kilby
(C) Robert Noyce
(D) William Shockley
3. The 555 timer can operate in how many modes?
(A) One
(B) Two
(C) Three
(D) Four
4. The three modes of operation of a 555 timer are:
(A) Linear, Non-linear, Digital
(B) Monostable, Astable, Bistable
(C) Active, Passive, Hybrid
(D) Amplifier, Comparator, Oscillator
5. In monostable mode, the 555 timer acts as a:
(A) Flip-flop
(B) One-shot pulse generator
(C) Continuous oscillator
(D) Amplifier
6. In astable mode, the 555 timer acts as a:
(A) Free-running oscillator
(B) Pulse stretcher
(C) Comparator
(D) Integrator
7. In bistable mode, the 555 timer acts as a:
(A) Flip-flop
(B) Differentiator
(C) Amplifier
(D) Oscillator
8. The 555 timer IC contains how many comparators?
(A) One
(B) Two
(C) Three
(D) Four
9. The control voltage pin of the 555 timer is:
(A) Pin 5
(B) Pin 2
(C) Pin 4
(D) Pin 3
10. The discharge pin of the 555 timer is:
(A) Pin 7
(B) Pin 6
(C) Pin 2
(D) Pin 3
11. The threshold pin is connected to the:
(A) Upper comparator
(B) Lower comparator
(C) Output stage
(D) Reset circuit
12. The trigger pin is connected to the:
(A) Lower comparator
(B) Upper comparator
(C) Reset terminal
(D) Output terminal
13. The output pin of the 555 timer is:
(A) Pin 3
(B) Pin 1
(C) Pin 5
(D) Pin 7
14. The reset pin of the 555 timer is used to:
(A) Disable the output
(B) Control frequency
(C) Set timing interval
(D) Change duty cycle
15. The 555 timer requires a DC supply voltage typically between:
(A) 3V and 15V
(B) 1V and 5V
(C) 10V and 30V
(D) 2V and 9V
16. In astable mode, the 555 timer produces:
(A) A continuous square wave
(B) A single pulse
(C) A sine wave
(D) A triangular wave
17. The output current capability of a 555 timer is approximately:
(A) 200 mA
(B) 10 mA
(C) 1 A
(D) 500 µA
18. The main timing elements in a 555 timer circuit are:
(A) Resistors and capacitors
(B) Inductors and resistors
(C) Diodes and resistors
(D) Transistors only
19. The duty cycle in a 555 timer’s astable mode depends on:
(A) Resistor ratio
(B) Supply voltage
(C) Load resistance
(D) Capacitance only
20. The analog multiplier performs what mathematical operation?
(A) Multiplication of two analog signals
(B) Subtraction of two analog signals
(C) Division of two analog signals
(D) Addition of two analog signals
21. An analog multiplier is commonly used in:
(A) Modulation and demodulation circuits
(B) Voltage regulators
(C) Digital counters
(D) Rectifiers
22. The output of an analog multiplier is proportional to:
(A) The product of two input voltages
(B) The sum of input voltages
(C) The difference of input voltages
(D) The ratio of input voltages
23. A four-quadrant analog multiplier can handle:
(A) Both positive and negative input signals
(B) Only positive signals
(C) Only negative signals
(D) Only AC signals
24. The Gilbert cell is a basic building block of:
(A) Analog multipliers
(B) Power amplifiers
(C) Rectifiers
(D) Voltage regulators
25. The analog multiplier is often used in:
(A) Frequency mixing applications
(B) Power rectification
(C) Signal filtering
(D) Voltage regulation
26. The main advantage of an analog multiplier is:
(A) It can perform analog signal processing directly
(B) It reduces circuit noise
(C) It eliminates the need for power supply
(D) It converts analog signals to digital form
27. A 555 timer can be used with an analog multiplier to create a:
(A) Voltage-controlled oscillator
(B) Power amplifier
(C) Low-pass filter
(D) Bridge rectifier
28. The analog multiplier is sometimes called a:
(A) Four-quadrant modulator
(B) Amplifier
(C) Inverter
(D) Integrator
29. The accuracy of an analog multiplier mainly depends on:
(A) Linearity and temperature stability
(B) Power supply voltage
(C) Signal frequency only
(D) Load resistance
30. 555 timers and analog multipliers are both classified under:
(A) Analog integrated circuits
(B) Digital logic circuits
(C) Power circuits
(D) Electromechanical devices