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DIGITAL ELECTRONICS interview questions

DIGITAL ELECTRONICS Ques 1. Explain about setup time and hold time, what will happen if there is setup time and hold tine violation, how to overcome this? Ans . For Synchronous flip-flops, we have special requirements for the inputs with respect to clock signal input there are Setup Time: Minimum time Period during which data must be stable before the clock makes a valid transition. E.g. for a positive edge triggered flip-flop having a setup time of 2ns so input data should be Stable for 2ns before the clock makes a  valid transaction from zero to one. Hold Time: Minimum time period during which data must be stable after the clock has made a valid transition. E.g. for a posedge triggered flip-flop, with a hold time of 1 ns. Input Data (i.e. R and S in the case of RS flip-flop) should be stable for at least 1 ns after clock has made transition from 0 to 1 Hold time is the amount of time after the clock edge that same input signal has to be held before changi...
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TCS Latest Placement Paper Questions - 2014 (5)

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1. Ray writes a two digit number.  He sees that the number exceeds 4 times the sum of its digits by 3.  If the number is increased by 18, the result is the same as the number formed by reversing the digits.  Find the number.  a) 35 b) 42 c) 49 d) 57 Solution: Let the two digit number be xy. 4(x + y) +3 = 10x + y .......(1) 10x + y + 18 = 10 y + x ....(2) Solving 1st equation we get 2x - y = 1 .....(3) Solving 2nd equation we get y - x = 2 .....(4) Solving 3 and 4, we get x = 3 and y = 5 2. a, b, c are non negitive integers such that 28a+30b+31c = 365. a + b + c = ? a) Greater than 14 b) less than or equal to 11 c) 13 d) 12 In a calender,  Number of months having 28 days = 1 Number of months having 30 days = 4 Number of months having 31 days = 7 28 x 1 + 30 x 4 + 31 x 7 = 365 Here, a = 1, b = 4, c = 7.  a+b+c = 12 3. George can do a piece of work in 8 hours. Paul can do the same work in 10 hours, Hari can do the same wor...
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Kumari Kandam- The Lost Continent(குமரிக்கண்டம்)

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Kumari Kandam- The Lost Continent(குமரிக்கண்டம்) “Lemuria” in Tamil nationalist mysticist literature, connecting Madagascar, South India and Australia (covering most of the Indian Ocean). Mount Meru stretches southwards from Sri Lanka. The distance from Madagascar to Australia is about 4,200 miles Kumari Kandam or Lemuria  (Tamil:குமரிக்கண்டம்) is the name of a supposed sunken landmass referred to in existing ancient Tamil literature. It is said to have been located in the Indian Ocean, to the south of present-day Kanyakumari district at the southern tip of India. References in Tamil literature There are scattered references in Sangam literature, such as Kalittokai 104, to how the sea took the land of the Pandiyan kings, upon which they conquered new lands to replace those they had lost. There are also references to the rivers Pahruli and Kumari, that are said to have flowed in a now-submerged la...
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