NTPC Placement Paper Technical - Electronics Bangalore-12 Apr 2008
Hi All,I have taken the written of NTPC ltd on April12th 2009Pattern 120 question technical 50 AptitudeWeightage of subjects as followsTechnicalInstrumentation----15-20 questionCommunication ------ 15-20Control systems -------15-20Microprocessors8085 ---4-5Digital electronics ------9-11Signal systems ------- 3-4Electronics ------------13-15AptitudeEnglish ----20Quant------20Reasoning---10Question which I remember as followsTechnical1)Gain bandwidth product of 2 stage CE amplifier compared to single stagea). greater b). lesser c). same etc2)Early effect in transistor leads ina). Fast switch b). slow switch etc3)MOSFET acts as aa). Resistor b). inductor c). capcitor etc4)Normal PH is a)7 b)2 c)5 etc5)Gave number of bits as 8 and max voltage as 100V asked to calculate resolution6)strain guage working principlea). resistor c). capacitor etc7)Class AB propertya). More efficiency b). avoids crossoverdistrotion8)3-4 problems related to oscilloscope9)Gave a simple block diagram asked to find TF10)Gave discrete sequence asked to calculate DFT11)x(at)------Ztransform---a)1/aX(z/a) etc12)Peak overshoot 100% calculate damping factora)0.707 b)1.732 c)0.5 etc13)gave transfer function asked to calculate phase crossover frequency14)If modulating frequency doubles then BW of FM becomesa). twice b). half c). same etc15)Gave unmodulated carrier power and modulated carrier power asked calculate modulation index16)In TDM system no: of telephone channels give asked to calculate o/p freequecy17)3 to 4 problems on bridges and instrumentation18)If range is more it leads ina). More precision b). more accuracy c). more error19)2to3 problems on ADC and DAC to calculate the number or output bits reqd20)Problem based on channel capacity theorm21)Vectorred interrupt among the followinga). RST 6.5 b). RST 5.5 c). TRAP d)INTR22)Memory of 64x1k available 4 such memory clubbed together with single address line give a)16x16k b)256x1k etc23)For a stable systema) h[n]!=0 n>0b) h[n]!=0 n<0c) h[n]=0 n<0b) h[n]=0 n>024)Wn in DFT a shifting property was asked25)Wheat stone bidge used for measuringa) resistor b) inducator etc26)RLC ckt responsea) exponentially increasing b) decreasing etc27)FET is aa) VCVS b) CCCS c) VCCS d) CCVS28)Gave a TF asked to identify the poles and zeroes29)Gave a characteristic equation asked to find number poles in right side30)Optical wavelength range asked31)LASER abbreviation---------32)Schotky TTL diode is used to reducea) delay b) gates c) power d) noneAptitudeEnglish1) Prepostions 3 to 42)Synonyms & antonyms 3)grammer Quant1)Ratios2)Profit & loss3)Bar graph given asked to find several things4)Puzzles related persons going to different offices5)Words coding etcThat?s all I remember All the BestBest regards,Sudhakar Thota
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