# Digital Signal Processing MCQ Questions & Answers

Digital Signal Processing MCQs : This section focuses on the "Digital Signal Processing". These Multiple Choice Questions (MCQs) should be practiced to improve the Digital Signal Processing skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A 4-bit R/2R ladder digital-to-analog converter uses ________.

A. one resistor value
B. two resistor values
C. three resistor values
D. four resistor values

Question 2

An op-amp has very ________.

A. high voltage gain
B. high input impedance
C. low output impedance
D. all of the above

Question 3

For a 4-bit DAC, the least significant bit (LSB) is ________.

A. 6.25% of full scale
B. 0.625% of full scale
C. 12% of full scale
D. 1.2% of full scale

Question 4

How are unwanted frequencies removed prior to digital conversion?

A. Pre-filters
B. Digital signal processing
C. Sample-and-hold circuits
D. All of the above

Question 5

In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.

A. 5 volts
B. zero volts
C. a voltage determined by the binary weighted input
D. none of the above

Question 6

In a digital representation of voltages using an 8-bit binary code, how many values can be defined?

A. 16
B. 64
C. 128
D. 256

Question 7

In a digital reproduction of an analog curve, accuracy can be increased by ________.

A. sampling the curve more often
B. sampling the curve less often
C. decreasing the number of bits used to represent each sampled value
D. all of the above

Question 8

In a flash analog-to-digital converter, the output of each comparator is connected to an input of a ________.

A. decoder
B. priority encoder
C. multiplexer
D. demultiplexer

Question 9

In troubleshooting a DAC, we check its performance characteristics, such as ________.

A. nonmonotonicity
B. differential nonlinearity
C. low and high gain
D. all of the above

Question 10

Settling time is normally defined as the time it takes a DAC to settle within ________.

A. 1/8 LSB of its final value when a change occurs in the input code
B. 1/4 LSB of its final value when a change occurs in the input code
C. 1/2 LSB of its final value when a change occurs in the input code
D. 1 LSB of its final value when a change occurs in the input code

Question 11

The ADC0804 is an example of a ________.

A. single-slope analog-to-digital converter
B. dual-slope analog-to-digital converter
C. digital-ramp analog-to-digital converter
D. successive-approximation analog-to-digital converter

Question 12

The dual-slope analog-to-digital converter finds extensive use in ________.

A. digital voltmeters
B. function generators
C. frequency counters
D. all of the above

Question 13

The resolution of a 6-bit DAC is ________.

A. 63%
B. 64%
C. 15.90%
D. 1.59%

Question 14

What do we call the manipulation of an analog signal in a digital domain?

A. Analog-to-digital conversion
B. Digital-to-analog conversion
C. Digital signal processing
D. Signal filtering

Question 15

What is the result of taking more samples during the quantization process?

A. More errors in the analog-to-digital conversion
B. More bit requirements
C. More accurate signal representation
D. More bit requirements and more accurate signal representation

Question 16

Which A/D conversion method has a fixed conversion time?

A. Single-slope analog-to-digital converter
B. Dual-slope analog-to-digital converter
C. Digital-ramp analog-to-digital converter
D. Successive-approximation analog-to-digital converter

Question 17

Which is a typical application of digital signal processing?

A. Noise elimination
B. Music signal processing
C. Image processing
D. All of the above

Question 18

Which is not an A/D conversion error?

A. Differential nonlinearity
B. Missing code
C. Incorrect code
D. Offset

Question 19

Which of the following best defines Nyquist frequency?

A. The frequency of resonance for the filtering circuit
B. The second harmonic
C. The lower frequency limit of sampling
D. The highest frequency component of a given analog signal

Question 20

Which term applies to the maintaining of a given signal level until the next sampling?

A. Holding
B. Aliasing
C. Shannon frequency sampling
D. "Stair-stepping"

Question 21

Which type of ADC quantizes the analog signal into a stream of bits whose amount corresponds to the signal level?

A. Successive approximation
B. Sigma-delta
C. Dual-slope
D. None of the above

Question 22

Which type of programming is typically used for digital signal processors?

A. Assembly language
B. Machine language
C. C
D. None of the above

Question 23

How many address register does the AAU of a DSP56000 have?

A. 8
B. 16
C. 24
D. 32

Question 24

How many bits does DSP56000 processor have?

A. 8
B. 16
C. 24
D. 32

Question 25

How many buses did DSP56000 possess?

A. 2
B. 3
C. 4
D. 5

Question 26

How many registers does a DSP56000 have?

A. 4
B. 5
C. 7
D. 6

Question 27

How many tables does an FIR function of a digital signal processor possess?

A. 1
B. 2
C. 3
D. 4

Question 28

Name a processor which is used in digital audio appliances.

A. 8086
B. Motorola DSP56000
C. 80486
D. 8087

Question 29

What are the factors of filters which are determined by the speed of the operation in a digital signal processor?

A. attenuation constant
B. frequency
C. bandwidth
D. phase

Question 30

What does AAU stand for?

D. arithmetic access unit

Question 31

What types of modules are used in the digital signal processor to form the loop structure?

A. modulo-timer
B. modulo-counter
C. timer
D. external timer

Question 32

Which architecture can one overcome the low bandwidth issue in MC6800 family?

A. RISC
B. CISC
C. von Neumann
D. program stored

Question 33

Which architecture in digital signal processor reduces the execution time?

A. Harvard
B. CISC
C. program storage
D. von Neumann

Question 34

Which of the following architecture does DSP56000 possess?

A. Harvard
B. von Neumann
C. CISC
D. program-stored

Question 35

Which of the following bits are used for sign extension in DSP56000?

A. upper 8 bits of the stack pointer
B. lower 8 bits of the stack pointer
C. lower 8 bits of the program counter
D. upper 8 bits of the program counter

Question 36

Which of the following processors also can work as a digital signal processor?

A. 8086
B. 8088
C. 8080
D. ARM9E

Question 37

Why is said that branch prediction is not applicable in a digital signal processor?

A. low bandwidth
B. high bandwidth
C. low frequency
D. high frequency

Question 38

Any digital computer can be used for DSP.

A. True
B. False

Question 39

Reduction in the number of binary words required to represent an analog signal is called ________

A. Undersampling
B. Oversampling
C. Data compression
D. Data minimization

Question 40

Selectivity in a DSP is better than its analog equivalent.

A. True
B. False

Question 41

What happens after the signal is passed through the analog to digital converter in a DSP?

A. Changed back to analog
B. Stored in a RAM
C. Amplified
D. Attenuated

Question 42

What is the accessibility limitation of only one data or instruction set at a time from the memory called?

A. Von Neumann limitation
B. Von Neumann limit
C. Von Neumann speed
D. Von Neumann bottleneck

Question 43

What is the process of examining the frequency content of a signal?

A. Signal decoding
B. Spectrum analysis
C. Signal analysis
D. Data analysis

Question 44

What is the program that is used to speed the spectrum analysis process?

A. DDFT
B. FDFT
C. FGPA
D. Fast Fourier transforms

Question 45

Which of the following is not possible when the signal is analog?

A. Phase shifting
B. Equalization
C. Modulation
D. Data compression

Question 46

Which type of architecture uses different storage space for program code and the data?

A. Von Neumann architecture
B. Harvard architecture
C. Fragmented architecture
D. Split cell architecture

Question 47

Who is credited with creating the stored program concept?

A. John Von Neumann
B. Larry Page
C. Alan Turing
D. Ken Thompson