Signals Simplified: Understanding Continuous and Discrete Signals Quiz

1. Definition of Signal

   Which description best defines what a 'signal' is in engineering?

   1. A physical quantity that varies with time and conveys information
   2. A device used to measure temperature
   3. A mathematical constant
   4. A power supply circuit
   5. A type of noise heard through speakers

2. Continuous-Time Signal Identification

   If a function x(t) is defined for every value of time t, what type of signal is x(t)?

   1. Continuous-time signal
   2. Discrete-time signal
   3. Digital signal
   4. Random signal
   5. Periodic signal

3. Discrete-Time Signal Example

   Which of the following is the best example of a discrete-time signal?

   1. Temperature recorded every hour
   2. Voltage varying smoothly over time
   3. Sunlight intensity measured every instant
   4. Water flowing continuously from a tap
   5. Analog clock readings

4. Sampling Concept

   What does the process of 'sampling' involve?

   1. Measuring a signal at discrete intervals of time
   2. Increasing the amplitude of a signal
   3. Mixing two continuous-time signals
   4. Adding noise to a signal
   5. Converting a number to hexadecimal

5. Signal Value Sets

   Which statement is true about continuous-time signals in terms of their values?

   1. They can take any value at any instant of time
   2. They are zero except at even time points
   3. They only take integer values
   4. They only exist between 0 and 1 second
   5. They are always periodic

6. Notation Distinction

   For a discrete-time signal, which notation is commonly used to represent it?

   1. x[n]
   2. x(t)
   3. f{x}
   4. t[n]
   5. x.y

7. Real-World Signal Types

   The audio waveform from a live musical performance is best classified as which type of signal?

   1. Continuous-time signal
   2. Discrete signal
   3. Impulse signal
   4. Hybrid signal
   5. Fictitious signal

8. Basic Application

   Which device typically outputs a discrete-time signal?

   1. Digital thermometer displaying values every minute
   2. Mercury thermometer showing temperature continuously
   3. Traditional analog radio
   4. Analog voltmeter
   5. Light bulb glowing steadily

9. Signal Characteristics

   What is a key characteristic of discrete-time signals?

   1. They have values only at specific points in time
   2. They require continuous variables for definition
   3. They have infinite frequency components
   4. They are always sinusoidal
   5. They cannot represent information

10. Error Checking

    Which of these is NOT a type of signal in signal processing?

    1. Curved-time signal
    2. Discrete-time signal
    3. Continuous-time signal
    4. Digital signal
    5. Analog signal