Embedded And Real Time System Set 5

Electrical Engineering

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This set of Embedded and Real Time System Multiple Choice Questions & Answers (MCQs) focuses on Embedded And Real Time System Set 5

Q1 | For image compression which tool is helpful?
  • wordpress cache enable a plugin
  • optimus wordpress plugin
  • glup-uglify
  • speed test tool
Answer: optimus wordpress plugin
Explaination:
optimus wordpress plugin is used for lossless as well as lossy image compression. it automatically reduces the size of the file. reduction in size is possible up to 70%. there are three versions of optimus i.e. optimus hq, optimus, optimus hq pro. speed test tools are used to measure/note down your pages speed performance.
Q2 | HTTP request is between
  • client and host
  • client and server
  • server and host
  • user and server
Answer: client and host
Explaination:
http stands for hypertext transfer protocol. for fetching, data from server browser uses http request, and in between client and host. the more http request slower the loading of a page will be.
Q3 | Which of the following is not render blocking resource?
  • css
  • html
  • javascript
  • jquery
Answer: jquery
Explaination:
html, css and javascript are render blocking resources to the dom. to enhance the speed of your web page these resources should be properly used.
Q4 | For best speed position of JavaScript code should be at                              
  • top of the code
  • bottom of the code
  • middle of the code
  • anywhere in the code
Answer: bottom of the code
Explaination:
for better loading time of the page it is always recommended to put javascript code at the bottom of the main code of the page before tag. css code should be at the beginning of the code.
Q5 | What is the work of Gzip compression?
  • compresses an image
  • compresses web pages only
  • compresses javascript and css code only
  • compresses web pages, javascript and css
Answer: compresses web pages, javascript and css
Explaination:
basically gzip compression is used to compress text data in websites. gzip compression is very useful in web performance optimization. it compresses web pages, javascript and css. gzip is also one of the file formats. gzip compression can be enabled via webserver configuration.
Q6 | What is hotlink protection?
  • stopping other sites from displaying images
  • stopping other sites from displaying videos
  • stopping access of source code
  • compresses an image
Answer: stopping other sites from displaying images
Explaination:
hotlink protection is a kind of tool. hotlink protection is related to restricting http, it stops other sites from displaying images of your webpage. we can create a list of hostnames that can access the resources of our website.
Q7 | For best speed position of CSS code should be at                      
  • at the bottom of the code
  • at the middle of the code
  • at the top of the code
  • anywhere in the code
Answer: at the top of the code
Explaination:
css styling and code should be placed at the top of the code for best loading result of the webpage. javascript code should be placed at the bottom of the page for best performance and rapid loading speed of the website.
Q8 | What is not the work of database optimization?
  • cleaning out old tables
  • creating indexes
  • optimize datatype
  • delete database
Answer: delete database
Explaination:
we store various information in the database. a database is a collection of tables that contain information. database delay takes a long waiting time, so there are various techniques for database optimization. database optimization basically optimizes data types, tables, data size.
Q9 | Which of the following is the Waterfall tool?
  • webpagetest.org
  • dotcom-monitor
  • pingdom speed test
  • gtmetrix
Answer: webpagetest.org
Explaination:
waterfall views are useful for
Q10 | Which of the following is not the layer of the OSI Model?
  • transport layer
  • network layer
  • session layer
  • atomic layer
Answer: atomic layer
Explaination:
osi model stands for open systems interconnection model. it is commonly used for representing various parts of network traffic. there are seven layers in the osi model, physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer.
Q11 | Which browser gives maximum parallel connections per host?
  • opera 10
  • chrome 1 and 2
  • safari 3 and 4
  • firefox 3
Answer: opera 10
Explaination:
parallel downloading is very beneficial to performance. opera 10 provides the maximum parallel connections per host
Q12 | Which of the following help to meet and prove real-time constraints?
  • simulator
  • debugger
  • emulator
  • compiler
Answer: compiler
Explaination:
there are several reasons for designing the optimization and compilers and one such is that it could help to meet and prove the real-time constraints.
Q13 | Which of the following is an important ingredient of all power optimization?
  • energy model
  • power model
  • watt model
  • power compiler
Answer: power model
Explaination:
saving energy can be done at any stage of the embedded system development. the high-level optimization techniques can reduce power consumption and similarly compiler optimization also can reduce the power consumption and the most important thing in power optimization are the power model.
Q14 | Who proposed the first power model?
  • jacome
  • russell
  • tiwari
  • russell and jacome
Answer: tiwari
Explaination:
tiwari proposed the first power model in the year 1974. the model includes the so-called bases and the inter-instruction instructions. base costs of the instruction correspond to the energy consumed per instruction execution when an infinite sequence of that instruction is executed. inter instruction costs model the additional energy consumed by the processor if instructions change.
Q15 | Who proposed the third power model?
  • tiwari
  • russell
  • jacome
  • russell and jacome
Answer: russell and jacome
Explaination:
the third model was proposed by russell and jacome in the year 1998.
Q16 | Which compiler is based on the precise measurements of two fixed configurations?
  • first power model
  • second power model
  • third power model
  • fourth power model
Answer: third power model
Explaination:
the third model was proposed by russell and jacome in the year 1998 and is based on the precise measurements of the two fixed configurations.
Q17 | What does SPM stand for?
  • scratch pad memories
  • sensor parity machine
  • scratch pad machine
  • sensor parity memories
Answer: scratch pad memories
Explaination:
the smaller memories provide faster access and consume less energy per access and spm or scratch pad memories is a kind of small memory which access fastly and consume less energy per access and it can be exploited by the compiler.
Q18 | Which model is based on precise measurements using real hardware?
  • encc energy-aware compiler
  • first power model
  • third power model
  • second power model
Answer: encc energy-aware compiler
Explaination:
the encc-energy aware compiler uses the energy model by steinke et al. it is based on the precise measurements of the real hardware. the power consumption of the memory, as well as the processor, is included in this model.
Q19 | What is the solution to the knapsack problem?
  • many-to-many mapping
  • one-to-many mapping
  • many-to-one mapping
  • one-to-one mapping
Answer: one-to-one mapping
Explaination:
the knapsack problem is associated with the size constraints, that is the size of the scratch pad memories. this problem can be solved by one-to-one mapping which was presented in an integer programming model by steinke et al.
Q20 | How can one compute the power consumption of the cache?
  • lee power model
  • first power model
  • third power model
  • cacti
Answer: cacti
Explaination:
the cacti can compute the power consumption of the cache which is proposed by wilton and jouppi in the year 1996.
Q21 | In real time operating system
  • all processes have the same priority
  • a task must be serviced by its deadline period
  • process scheduling can be done only once
  • kernel is not required
Answer: a task must be serviced by its deadline period
Explaination:
none.
Q22 | For real time operating systems, interrupt latency should be                          
  • minimal
  • maximum
  • zero
  • dependent on the scheduling
Answer: minimal
Explaination:
interrupt latency is the time duration between the generation of interrupt and execution of its service.
Q23 | In rate monotonic scheduling
  • shorter duration job has higher priority
  • longer duration job has higher priority
  • priority does not depend on the duration of the job
  • none of the mentioned
Answer: shorter duration job has higher priority
Explaination:
none.
Q24 | In which scheduling certain amount of CPU time is allocated to each process?
  • earliest deadline first scheduling
  • proportional share scheduling
  • equal share scheduling
  • none of the mentioned
Answer: proportional share scheduling
Explaination:
none.
Q25 | The problem of priority inversion can be solved by                          
  • priority inheritance protocol
  • priority inversion protocol
  • both priority inheritance and inversion protocol
  • none of the mentioned
Answer: priority inheritance protocol
Explaination:
none.
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