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# Tata Elxsi Placement 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

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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