MEMS
Posted by Superadmin on March 27 2016 06:32:06
1. ________ Wireless operates services are based on a Wi-Fi Positioning System (WPS).
a) Skydrive
b) Skyhook
c) SkyLook
d) None of the mentioned

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2. Point out the wrong statement:
a) MEMS stands for microelectromechanical systems
b) MEMS as a class can be between 1000 and 100000 micrometers in size
c) Several MEMS are packaged in smartphones
d) All of the mentioned

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3. Which of the following system is constantly polling locations to update them and recalibrating data points to improve accuracy over time ?
a) WPS
b) GPS
c) XPS
d) All of the mentioned

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4. Which of the following has a Java API that works with the Skyhook network ?
a) Looki
b) Look
c) Loki
d) All of the mentioned

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5. Point out the correct statement:
a) MEMS is a class of very small sensor or actuator devices where small mechanical systems are driven by electricity to indicate a position
b) The incorporation of low-cost geo-sensors in the form of GPS chips into mobile devices opens the mobile user to a whole range of services based on the client’s location
C) The iPhone uses the proximity sensor to turn the screen off when a user puts the phone to his face
d) All of the mentioned


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6. Which of the following service is example of push technology ?
a) Automated software updates
b) Comet
c) HTTP streaming
d) All of the mentioned

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7. The IRC protocol and the XMPP IM and VoIP protocol are examples of ______ push technologies.
a) P2P
b) C2C
c) B2B
d) None of the mentioned

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8. Which of the following transport protocol combined with XMPP can be used for push service ?
a) BOSH
b) UOSH
c) MOSH
d) All of the mentioned

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9. In the parlance of system design, the active transfer process is referred to as “push” and server is called _______
a) CDN
b) MDA
c) MDB
d) None of the mentioned

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10. Which of the following push technology is similar to SMTP ?
a) Push-IMAP
b) Pull-IMAP
c) Push-POP3
d) All of the mentioned

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Answers

1. b
Explanation:The advantage of WPS is that there are hundreds of millions of Wi-Fi access points worldwide and they are closer to the mobile device.

2. b
Explanation:MEMS as a class can be between 1 and 1000 micrometers in size.

3. c
Explanation:The system uses a large reference database of Wi-Fi access points and cell tower IDs, raw position data from each location source (a signal), and the company’s proprietary algorithm to locate the device.

4. c
Explanation:Loki has its browser plug-in to locate users for subscribing Web sites.

5. d
Explanation:There are many more contexts that can be used in processing client requests and returning relevant information.

6. d
Explanation:The opposite of a push is a pull technology, in which the client polls for and requests a transaction.

7. a
Explanation:The XMPP PubSub extension is how Apple creates a push service for MobileMe.

8. a
Explanation:BOSH stands for Bidirectional Streams Over Synchronous HTTP.

9. b
Explanation:client is called Mail User Agent(MUA).

10. a
Explanation:Push-IMAP stands for the Push extensions for Internet Message Access Protocol.