hallo I am looking for technical theortical knowledeg in air flow inside pipe and tunel's such as resisten of surefa's calculation and sempal's of calculation hopethat some budy can halp my thank you from devas
2364A mechanism which enables the rotary motion of one shaft to another shaft at the same axis is called a) Gear box b) Differential c) Clutch d) Flywheel
1 13360The main advantage of a good clutch is a) Good torque transmission b) Rapid engagement c) Large size d) High inertia
2258Hard shifting of gears would result when a) There is rapid engagement of gears b) There is less heat dissipation c) The clutch inertia is very high d) There is no clutch free pedal play
1540The coefficient of friction for the Asbestos-based materials used for clutch facing is a) 0.07 b) 0.17 c) 0.27 d) 0.37
1 3566The maximum amount of axial load to be applied on a clutch plate is a) 100 KN b) 200 KN c) 300 KN d) 400 KN
1495Mean effective radius of contact surfaces of a clutch plate is decided by a) Coefficient of friction b) Axial pressure c) Space available in the vehicle d) Amount of torque to be transmitted
1342Axial force to keep the clutch in engaged position is provided by a) Springs arranged circumferentially b) Pressure plate c) Flywheel d) Clutch pedal
1395The friction plate is always mounted on a) flywheel b) Pressure plate c) Internally splined hub d) Clutch spring
1559The main advantage of single plate clutch over cone clutch is a) Easier gear changing b) Less binding of contact surfaces c) Less pedal movement d) all of the above
1692The main function of transmission is a) To provide means to vary the torque ratio between the engine and the road wheels b) To provide neutral position c) To provide means to back the car d) all of the above
1487The resistance to the vehicle motion whose magnitude remain constant with respect to the vehicle speed is a) Resistance due to gradient b) Resistance due to the road c) Resistance due to the tyre friction d) all of the above
1524The resistance to the vehicle motion whose magnitude various with the square of the vehicle speed is a) Resistance due to gradient b) Resistance due to road c) Resistance due to the tyre friction d) Resistance due to wind
1266If the tractive effort is the highest for a given velocity, then the vehicle must be in a) Top gear b) Third gear c) Second gear d) First gear
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4 down vote favorite share [g+] share [fb] share [tw] I am developing my site using server side sessions using redis as backend for saving the session. Now the issue which is bothering me is of user leaving the website without logging out. I mean user simply closes the browser which causes the cookie to be deleted. Now session of that user still exists on the server and will not be used again as new login requires creating a new session due to security reasons. To avoid the case where hacker steals the old cookie and use it after user login again with same old session id. In essence user leaves the website without explicitly logging out and his session will be deleted after certain time limit of inaccessibility. I am thinking time limit of 30-60 minutes. Also with every new request from user his cookie will also be updated to keep track of when the user last time accessed the site. But nowadays, people let site remain open for long time without accessing it. For example users open facebook and gmail in new tabs and forget about them for 2-3 hours and still they are not asked to login again. Is letting a 2-3 hours old cooke access the session secure? My concern is someone steals user cookie and use it 2-3 hours later. Thinking on this topic has also forced me to question how facebook manages security if user can use a session where they are not accessing it for long periods of time and still they remain logged in. Or is it not secure for me to keep logged in when am not accessing the site session for longer period of time? It can be the case also there is some pinging mechanism using which sites keep track of user having their site open in a browser and when browser closes they are notified and can work accordingly. My website is a social network and needs all those security and usage features which a social network may need. I am new to web security and web development in general and may be the case where my above questions may seem a little basic. If you feel that is the case kindly point to some good reference where I can read and find answers to my question.