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問題一覧
1
What does the word synchronous digital circuits refers to?
Requires clock to work
2
What is the difference between a positive logic versus a negative logic for digital circuit?
Positive logic uses high voltage to represent binary 1 and low voltage to represent binary 0 while negative does the reverse
3
How many permutations are there for a 5-bit binary number?
32
4
What happen when sampling is performed below Nyquist rate?
Aliasing will occur
5
What is the purpose of quantisation?
Convert an analog sample to a discrete digital value.
6
Which of the following would you consider to be the biggest disadvantage of digital signal representation?
Digital data are easily copied, hence requires additional data protection.
7
Given a minimum period for a signal is 1.5 ns, what is the most appropriate sampling frequency.
1.4 GHz
8
When a signal sample ranging between -10V to +10V is converted to a digital signal using an 8-bit ADC, what is the quantisation noise?
78mV
9
What is the main trade-off when you sampling at much higher frequency beyond Nyquist rate?
Larger file size
10
Which are the follow are correct when describing about virtual machine (VM) and container? (select all that apply)
VM support multiple OS while container usually support single OS., Multiple applications are able to run on both VM and Container., Container has a lower overhead than VM.
11
Which bus is bi-directional
Data
12
Arrange the following memory in increasing order of their access time with (1) being the fastest
1. Cpu register 2. Cache memory 3. Main memory 4. External harddisk 5. Secondary memory
13
Which of the following is NOT a task of an operating system (OS).
Control how much RAM can be installed on a computer hardware.
14
Computer and mobile devices have RAM that are usually volatile, what does this mean?
The content of the RAM are lost after power off.
15
A Von Neumann computer contains 3 key components, they are: (Select all that applies)
I/O, Memory, CPU
16
The program execution cycle is usually described as a 3 stage process, which is the correct sequence during execution?
Fetch, Decode, Execute
17
In a typical computer, when a programmer declare a variable integer, where is this stored?
RAM
18
Given a sampling frequency of 1.5 GHz, what is the maximum frequency of a signal that it can capable of digitalising without signal loss.
< 750 MHz
19
Given a memory chip with 16-bit data bus and 31-bit address bus, what is the capacity of the memory?
4 GB
20
Which device performs quantisation?
Analog to Digital Converter
21
In computer, convert 1.25KB to bytes.
1280 bytes
22
When you use an analog to digital converter with 20-bit resolution, how many levels will each sample be represented
1048576
23
When an audio signal is sampled at 20KHz at 16-bit resolution at stereo (2 channels for left and right channel) quality, what is the file size that you will expect for a 5 minutes recording?
22.888 MB
24
The central processing unit or CPU contains register, control unit and______?
ALU
25
Given a 16-bit binary number 1100 1010 0101 0110, identify the value for bit 9 and bit 8.
10
26
What is the use of anti-liasing filter?
To improve signal quality
27
10 bit ADC is used to samoke a 0.3V signal to temperature sensor, what is the smallest voltage is able to differentiate (something wrong with this ques)
0.000146V, 0.000146 V
28
Which type of bus is not found in modern day computer?
Cache bus
29
An analog single after going through an ADC represents a discrete time and continuous value. Given that each mp3 music file have 5MB, how many song can a memory of 2GB store?
400
30
What is the most common material of a semiconductor
Silicon, silicon
31
Human hearing range is below 20kHz, what will be the recommended min of sampling frequency based on nyquist rate?
50
32
Which register inside the CPU keep track of the current instruction being executed?
Instruction register