Daily Technical Quiz Event.

Replies

• 

  rahul69

  The Idea is Awesome!!👍 ..as it will provide an already present challenge to be faced each day, but it is better to decide who is going to post question, a day before the next quiz, otherwise it may happen that no post comes due to confusion 😕 ...Also a fixed timetable is required for each branch...and thats all I can think of right now...
• 

  Sindhu Chowdary

  yeah rahul69 is right...what if many questions were asked on the same day bcoz no one knows who is going to post the question next!!!!!😐
• 

  Abhishek Rawal

  We'll make schedule of it & even poll same like Weekly tech discussions 😀
• 

  pikachu1994

  Really nice idea.i think we can also give importance to general knowledge,current affairs as it plays an important role in all competitive exams
• 

  Harshad Italiya

  Troll_So_Hard

  We'll make schedule of it & even poll same like Weekly tech discussions 😀

  We can do one thing here. We can start a thread in which CEans who want to ask a question have to submit their Questions to one volunteer and that volunteer will start a thread in all branch with OP name.
  We also need more than two three volunteer to manage this event successfully.
• 

  Ramani Aswath

  godfather

  We can do one thing here. We can start a thread in which CEans who want to ask a question have to submit their Questions to one volunteer and that volunteer will start a thread in all branch with OP name.
  We also need more than two three volunteer to manage this event successfully.

  I was thinking of a somewhat similar approach. The Admin can create QMCE (quiz master CE) for each category. The QM will be nameless. Questions with answers have to be mailed to QMCE, otherwise all know all questions randomly.
  Each day the concerned QMCE can post one question. A special report button with appropriate ratings can be added to the existing bar. The OP alone should be able to access this. The OP ID is revealed only when the correct answer is given.
• 

  Jeffrey Arulraj

  I am in what Sir and GF says are the best possible things We need a team willing to post in the time frame that is the most important thing of all
• 

  Whats In Name

  I am all ready for it.I am just waiting for the quiz to start!
• 

  Jeffrey Arulraj

  The point that hits my head is why is this idea not yet implemented
  
  A test trial of this will be there from tomo
  
  Sorry Guys Me no Push over waiting to gather people around me to start a competition.
  
  I will be posting questions and let us see how many responses I get within this week.
  
  To the best of my knowledge they will be from Mechanical, Computer and obviously Electronics. Just two people needs to agree this post By tonight to get some MIND CHILLERS for a week.
  
  Don't under estimte ME you will regret it later.
  
  Questions will be die hard ones and let us see how it goes on in the future
  
  #-Link-Snipped-# the only condition is laid out and if two agree this I post the questions I framed for Pranav'13 as a trial round. And then from the Next week I will put in some extra time to make it more and more challenging.
• 

  Abhishek Rawal

  Conqueror

  #-Link-Snipped-# the only condition is laid out and if two agree this I post the questions I framed for Pranav'13 as a trial round. And then from the Next week I will put in some extra time to make it more and more challenging.

  Man, I am very much noob & nerfed.
  But fuck it, I am in for whatever/anything 😉
  
  Hope to hear it from some more CEans.
• 

  Jeffrey Arulraj

  Troll_So_Hard

  Man, I am very much noob & nerfed.
  But fuck it, I am in for whatever/anything 😉
  
  Hope to hear it from some more CEans.

  All trubies will Buddy See back u here at 9 have some errands and some planning to do
• 

  Jeffrey Arulraj

  No response 😔😲 I am surprised #-Link-Snipped-# Tell what in the world is wrong here
• 

  Ramani Aswath

  What is crow bar protection in power electronics?
• 

  Jeffrey Arulraj

  A way to remove voltage surges in high voltage appliances. The surges are grounded by the components which are similar to a crowbar thrown across the power lines.
  
  When iron is contacted two live wires there is short ckt and similar operation is carried by the components when they are used as shunts to the supply. This prevents the over voltage from damaging the other circuits
• 

  Ramani Aswath

  That is correct. The term comes from the practice of rapid short circuiting to prevent hazards in an emergency.
  In electrochemical machining heavy currents (though at moderate voltages) are used to machine complex aerospace turbines and casings in exotic materials. Both the job and the tool used are very expensive.
  Fast response spark detectors (typically 1 micro second) along with Crowbar circuits using very high current thyristors with very high I^2t values are used to short circuit the current and in a cascading manner shut down the power supply. A processor keeps track of the failure sequence for fault analysis and subsequent repair.
• 

  Ramani Aswath

  In the case of CNC machining what is compensation?
• 

  Jeffrey Arulraj

  #-Link-Snipped-# can you pls clarify and explain this to us Not sure of the usage of CNC machines
• 

  Ramani Aswath

  In CNC machining the programming covers tool movement path, traverse speed, depth of cut and such parameters. There is an inherent assumption that the tool does not change dimension. When cutting tough or hard aerospace materials there can be enough tool wear which can lead to dimensional inaccuracies in the part.
  
  Various options are used to handle this. The modifications needed in the programme for this are called compensation.
  
  We use a lot of CNC for medical devices manufacture. Since great accuracies are needed in mating parts tool wear compensation is an important consideration for us.
  
  #-Link-Snipped-#
• 

  Ramani Aswath

  Stress corrosion cracking is fairly common. Even in the kitchen low cost stainless steel vessels develop cracks from the top edge.
  Which kind of stress initiates such cracks?
• 

  rahul69

  I am not sure, but I think it is due to tensile stress...😕.
• 

  Ramani Aswath

  rahul69

  I am not sure, but I think it is due to tensile stress...😕.

  That is right. Stress corrosion cracking (SCC) happens when there is a corrosion initiated crack (along grain boundaries or crystal defects)in a member that is with a tensile stress. The tension pulls apart the crack.
  Sometimes this can be catastrophic.
  
  My first job was in the Central Electro Chemical Research Institute at Karaikudi (1960). I lived in quarters next to the director's. One night there was a loud noise from the director's kitchen. Prof. KSG Doss, who was the director, rushed to the kitchen to find the place spattered with mango pickles and the spicy juice.
  We investigated the SS vessel that was holding the pickles in the corrosion lab. The out side of the deep drawn vessel is under a high tensile stress. Good manufacturers will relieve this stress. What had happened was that a bit of the very salty sauce from the pickle got smeared on the outer wall. This initiated a tiny crack and the tension tore the whole vessel apart.
  
  Even plastics can suffer SCC.
  
  Stress Corrosion Cracking
• 

  Ramani Aswath

  Why is a 'fly back diode' used across inductors in a DC circuit?
• 

  Jeffrey Arulraj

  To prevent over shoot current from flowing back to the source and damaging the circuits
  
  In short to prevent overshoot current surge
• 

  Abhishek Rawal

  Interesting !
  
  What are "Futexes" ?
  What are "Mutexes" ?
  What they do & how are they used ?
• 

  Ramani Aswath

  Conqueror

  To prevent over shoot current from flowing back to the source and damaging the circuits. In short to prevent overshoot current surge

  Partly right. However, the voltage surge is a reverse voltage called 'kick back' voltage. In a sense this is a sort of 'current inertia'. Depending on the ohmic resistance this can be high enough to damage other components in the circuit. The diode is mounted reverse biased across the inductor to short out this reverse 'kick back' voltage.
  
  This was a routine precaution when we were using high current DC circuits.
  Flyback Diode
• 

  Whats In Name

  The event is going good,please bring in some computer science trivia!!😒
• 

  Abhishek Rawal

  Whats In Name

  The event is going good,please bring in some computer science trivia!!😒

  Here it is :
  
  

  Troll_So_Hard

  What are "Futexes" ?
  What are "Mutexes" ?
  What they do & how are they used ?

  Hint : Based on C language 😀
• 

  Whats In Name

  Troll_So_Hard

  Here it is :
  
  
  
  Hint : Based on C language 😀

  Really!😨 never knew of them,will be glad to know about!Time for some research.😕
• 

  Ramani Aswath

  I do not know the A, B (and certainly not) C of computer languages!
  I am from the mechanical calculator and slide rule era.
  All engineers knew only four letter words to shout when the calculations did not come out right.
• 

  Abhishek Rawal

  Whats In Name

  Really!😨 never knew of them,will be glad to know about!Time for some research.😕

  I will be amazed if Google can give you information on futexes !
  There's reason why Books will always be million times superior than Google.
  
  By the way,some hints :
  1) It's also known as futes
  2) It's mechanism in form of system call
  3) You can contact Linus Torvalds(He hates idea of this mechanism though) or Alan Cox for detailed information on it.
• 

  rahul69

  Troll_So_Hard

  Interesting !
  
  What are "Futexes" ?
  What are "Mutexes" ?
  What they do & how are they used ?

  Mutexes are the Mutual Exclusion objects used in locking in resource sharing to avoid arriving at deadlock states
  Futexes are Fast Userspace Mutexes, are linux constructs and perform same function as Mutexes.
• 

  Abhishek Rawal

  rahul69

  Mutexes are the Mutual Exclusion objects used in locking in resource sharing to avoid arriving at deadlock states
  Futexes are Fast Userspace Mutexes, are linux constructs and perform same function as Mutexes.

  Nice job #-Link-Snipped-#
  By the way, can you say how interface of futexes looks like ? (I mean code)
  
  Futes mainly depends on some several values.
  Let's consider two main "Wake" & "Wait" right now.
  In specific term as used in Kernel for lib devs as - futex_wait & futex_wake.
  
  So,What does futex_wake & futex_wait does ?
• 

  rahul69

  Troll_So_Hard

  Nice job #-Link-Snipped-#
  By the way, can you say how interface of futexes looks like ? (I mean code)
  
  Futes mainly depends on some several values.
  Let's consider two main "Wake" & "Wait" right now.
  In specific term as used in Kernel for lib devs as - futex_wait & futex_wake.
  
  So,What does futex_wake & futex_wait does ?

  futex_wait makes a process go into sleep, so as to wait untill other process which is executing, frees the resources.
  futex_wake wakes up the sleeping process when the required resources are freed.
• 

  Abhishek Rawal

  rahul69

  futex_wait makes a process go into sleep, so as to wait untill other process which is executing, frees the resources.
  futex_wake wakes up the sleeping process when the required resources are freed.

  Which process ?
  PS : Process can't go in sleep,it just blocks the calling thread.
  By the way,
  Can you write basic code of interface of futes ? (Something we call syntax)
  It has answer of all - alongwith three locks (My next question)
• 

  Whats In Name

  bioramani

  I do not know the A, B (and certainly not) C of computer languages!
  I am from the mechanical calculator and slide rule era.
  All engineers knew only four letter words to shout when the calculations did not come out right.

  😁Its okay,Sir,you can continue with your questions,I should & will be aware of some extra facts!😀
• 

  Jeffrey Arulraj

  What do holds transition control in Thyristor's gate?
  
  PS: transition is from OFF to ON state and the reverse