TATA ELxsi Placement Paper
Company: Tata Elxsi
(1)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)
(2)what is the resolution of an adc : vref/(2 pow n).
(3)some circuit is given with two f/f s ,what is that circuit? Ans may be shift reg
(4)spatial to temporal converter is ? (a) shift reg ( b) counter (c ) adc ans may be adc
(5) darlington is used for _____ ans high current gain
(6)some circuit with nand gates is given ,what is that circuit ans is xor
(7) a wired circuit with some nand gates is given asked the function of that circuit
(8) an opamp circuit is given asked to find the transfer function of it ( I think its an ideal integrator circuit)
(9)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
(10)most computers wont use floating point arithmetic .why?
a.costly b. slow c. cant
(11)bit-slice processor mean …… ans used for shift ,masking of bits
(12)tv resolution depends on a. bandwidth 2. detector c. no. of frames /sec
(13)equalizing pulses are sent in tv during a. horizontal blanking b. vertical blanking ……….
(14)cdma is not suitable for satellite communication . why ? ans may be complexity of operation
(15)ac motor used in servo applications is (a) single phase induction b.2 phase induction c. 3 phase induction
(16)given some waveforms and asked that which of the waveforms will have odd harmonics of sine terms
(17)asked for two’s complement of a number
(18)maximum signed no. represented by a 8 bit computer
(19)a chip has a capacity of 256bits,to implement a 1KB capacity how many chips are required ans 32
(20)ecl operates in ____ and ____ regions of the transistor
(21)given a transient circuit ,asked for time constant while charging and discharging
(22)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
(23) Venn diagram is given and asked to write expression for the shared portion in it
(24)cb and ce are ____ biased when transistor is in saturation
(25) 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 )
(26) condition for nyquist rate .
(27)carry look ahed adder is 1.fast 2. requires more h/w 3. costly
(28) ideal power supply will have a. zero internal resistance b. more o/p resistance c. less o/p resistance
TATA ELxsi Placement Paper
About TATA ELxsi
Tata Elxsi prides itself on having built its culture on the three pillars of equal opportunity and diversity, meritocracy and collaboration, and continued learning.
We are committed to providing equal employment opportunities to a multi-generational and multi-cultural global workforce irrespective of race, color, religion, sex, origin, disability, or status. We work hard to integrate the Tata group’s founding values in working with and serving the local communities we operate in, going beyond local regulations and laws. We pride ourselves on integrating a global workforce from across 20+ countries, and 26% of our employees are women – among the highest in our technology and engineering intensive industry.
We have built processes and performance management systems that support and reinforce the culture of meritocracy and recognizing and rewarding performance. This has helped us motivate and retain talent, reflected in the best retention rate in our industry.visit offical website of TATA ELXSI for more details.