Tata Elxsi Questions

Problem on lissojous pattern: in xy mode if vlg applied to xaxis is 2 sinwt then what is the vtg to be applied to yaxis so that we observe the following pattern on the cro : [angle b/n xaxis 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

Bitslice 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 )