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# Tata Elxsi Placement Paper

 Tata Elxsi Questions  (Pattern Paper) Problem on lissojous pattern: in x-y mode if vlg applied to x-axis is 2 sinwt then what is the vtg to be applied to y-axis so that we observe the following pattern on the cro : [angle b/n x-axis and the diagonal line is 45degrees] ans is 2root 2 sin (wt +45)     What is the resolution of an adc : vref/(2 pow n). Some circuit is given with two f/f s ,what is that circuit? Ans may be shift reg Spatial to temporal converter is ? (a) shift reg ( b) counter (c ) adc ans may be adc  Darlington is used for _____ ans high current gain Some circuit with nand gates is given ,what is that circuit ans is xor                                    A wired circuit with some nand gates is given asked the function of that circuit An opamp circuit is given asked to find the transfer function of it ( I think its an ideal integrator circuit) A pole zero pattern of an impedance function is given . it has a conjugate pair of zeros and a conjugate pair of poles ,then what elements does the impedance consists of? Ans LC elements Most computers wont use floating point arithmetic .why        a.costly b. slow c. cant Bit-slice processor mean …… ans used for shift ,masking of bits  ac motor used in servo applications is (a) single phase induction b.2 phase induction c. 3 phase induction TV resolution depends on a. bandwidth 2. detector c. no. of frames /sec Equalizing pulses are sent in tv during a. horizontal blanking b. vertical blanking ………. cdma is not suitable for satellite communication . why ? ans may be complexity of operation  Given some waveforms and asked that which of the waveforms will have odd harmonics of sine terms Asked for two’s complement of a number maximum signed no. represented by a 8 bit computer A chip has a capacity of 256bits,to implement a 1KB capacity how many chips are required ans 32 ecl operates in ____ and ____ regions of the transistor  Given a transient circuit ,asked for time constant while charging and discharging  He had given 4 statements about a f/f and asked which of them are correct  1. it can store a bit 2. jk f/f have rat race when storing a 2 bit info 3. master slave is used to store a 2 bit info  4. d f/f used as a latch for multiplexing operations   Venn diagram is given and asked to write expression for the shared portion in it                         cb and ce are ____ biased when transistor is in saturation   condition for nyquist rate carry look ahed adder is 1.fast 2. requires more h/w 3. costly  ideal power supply will have a. zero internal resistance b. more o/p resistance c. less o/p resistance  A problem on cro and probe interface i.e design of an attenuator for the cro probe (formula for it is R1 * c1 = R2 * C2 )

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