NTPC  Placement Paper   Technical - Electronics   Bangalore-12 Apr 2008

NTPC  Placement Paper   Technical - Electronics   Bangalore-12 Apr 2008


  • Posted by  FreshersWorld 
    7 Jan, 2012

    NTPC

    Hi All,

    I have taken the written of NTPC ltd on April12th  2009

    Pattern 120 question technical 50 Aptitude


    Weightage of subjects as follows

    Technical
    Instrumentation----15-20 question
    Communication ------ 15-20
    Control systems -------15-20
    Microprocessors8085 ---4-5
    Digital electronics ------9-11
    Signal systems ------- 3-4
    Electronics ------------13-15

    Aptitude
    English ----20
    Quant------20
    Reasoning---10

    Question which I remember as follows
    Technical


    1)Gain bandwidth product of 2 stage CE amplifier compared to single stage
    a). greater     b). lesser     c). same etc

    2)Early effect in transistor leads in
    a). Fast switch     b). slow switch etc

    3)MOSFET acts as a
    a). Resistor     b). inductor     c). capcitor etc

    4)Normal PH is
    a)7     b)2     c)5 etc

    5)Gave number of bits as 8 and max voltage as 100V asked to calculate resolution

    6)strain guage working principle
    a). resistor     c). capacitor etc

    7)Class AB property
    a). More efficiency     b). avoids crossoverdistrotion

    8)3-4 problems related to oscilloscope

    9)Gave a simple block diagram asked to find TF

    10)Gave discrete sequence asked to calculate DFT

    11)x(at)------Ztransform---
    a)1/aX(z/a) etc

    12)Peak overshoot 100% calculate damping factor
    a)0.707     b)1.732     c)0.5 etc

    13)gave transfer function asked to calculate phase crossover frequency

    14)If modulating frequency doubles then BW of FM becomes
    a). twice     b). half     c). same etc

    15)Gave unmodulated carrier power and modulated carrier power asked calculate modulation index

    16)In TDM system no: of telephone channels give asked to calculate o/p freequecy

    17)3 to 4 problems on bridges and instrumentation

    18)If range is more it leads in
    a). More precision     b). more accuracy     c). more error

    19)2to3 problems on ADC and DAC to calculate the number or output bits reqd

    20)Problem based on channel capacity theorm

    21)Vectorred interrupt among the following
    a). RST 6.5     b). RST 5.5     c). TRAP d)INTR

    22)Memory of 64x1k available 4 such memory clubbed together with single address line give
    a)16x16k     b)256x1k etc

    23)For a stable system
    a) h[n]!=0 n>0
    b) h[n]!=0 n<0
    c) h[n]=0 n<0
    b) h[n]=0 n>0

    24)Wn in DFT a shifting property was asked

    25)Wheat stone bidge used for measuring
    a) resistor     b) inducator etc

    26)RLC ckt response
    a) exponentially increasing     b) decreasing etc

    27)FET is a
    a) VCVS     b) CCCS     c) VCCS     d) CCVS

    28)Gave a TF asked to identify the poles and zeroes

    29)Gave a characteristic equation asked to find number poles in right side

    30)Optical wavelength range asked

    31)LASER abbreviation---------

    32)Schotky TTL diode is used to reduce
    a) delay     b) gates     c) power     d) none


    Aptitude

    English
    1) Prepostions 3 to 4

    2)Synonyms & antonyms

    3)grammer


    Quant
    1)Ratios

    2)Profit & loss

    3)Bar graph given asked to find several things

    4)Puzzles related persons going to different offices

    5)Words coding etc

    That?s all I remember All the Best


    Best regards,
    Sudhakar Thota



     

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