Tata Elxsi Questions
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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)
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What is the resolution of an adc : vref/(2 pow n).
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Some circuit is given with two f/f s ,what is that circuit? Ans may be shift reg
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Spatial to temporal converter is ? (a) shift reg ( b) counter (c ) adc ans may be adc
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Darlington is used for _____ ans high current gain
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Some circuit with nand gates is given ,what is that circuit ans is xor
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A wired circuit with some nand gates is given asked the function of that circuit
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An opamp circuit is given asked to find the transfer function of it ( I think its an ideal integrator circuit)
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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
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Most computers wont use floating point arithmetic .why a.costly b. slow c. cant
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Bit-slice processor mean �� ans used for shift ,masking of bits
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ac motor used in servo applications is (a) single phase induction b.2 phase induction c. 3 phase induction
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TV resolution depends on a. bandwidth 2. detector c. no. of frames /sec
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Equalizing pulses are sent in tv during a. horizontal blanking b. vertical blanking ���.
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cdma is not suitable for satellite communication . why ? ans may be complexity of operation
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Given some waveforms and asked that which of the waveforms will have odd harmonics of sine terms
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Asked for two�s complement of a number
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maximum signed no. represented by a 8 bit computer
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A chip has a capacity of 256bits,to implement a 1KB capacity how many chips are required ans 32
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ecl operates in ____ and ____ regions of the transistor
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Given a transient circuit ,asked for time constant while charging and discharging
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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
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cb and ce are ____ biased when transistor is in saturation
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condition for nyquist rate
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carry look ahed adder is 1.fast 2. requires more h/w 3. costly
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ideal power supply will have a. zero internal resistance b. more o/p resistance c. less o/p resistance
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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 )