Monday, 26 October 2015

ISRO- Mock Test 4


ISRO Mock Test GENCO Model Test-1
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ISRO Important concepts - Click Here


  • 1) Threshold voltage(Vt) is negative for ?
    • an n-channel enhancement MOSFET
    a p-channel depletion MOSFET
    an n-channel depletion MOSFET
    a p-channel JFET






  • 2) GaAs is a ______ semiconductor ?
    • Indirect bandgap
    Direct bandgap
    p-type
    n-type






  • 3) A heavily doped diode used as microwave oscillator ?
    • Esaki
    Zener
    Schottky
    PIN






  • 4) The term "Cycle Stealing" related to?
    • Programable Peripheral Interface
    Programable Timer
    Direct Memory Access
    Virtual Memory





  • 5) Zener Diode works on the Principle
    • Thermionic emission
    Tunneling
    Avalanche Breakdown
    Diffusion





  • 6) An op amp has differential gain of 120dB and common mode gain of 20dB then CMRR
    • 140dB
    100dB
    80dB
    60dB





  • 7) Class B power amplifier has conduction angle of
    • 360 degrees
    270 degrees
    120 degrees
    180 degrees





  • 8) An EM wave of the form Ex=5Cos(wt+Bz) propagate along direction
    • +X
    +Z
    +Y
    -Z





  • 9) Bode plot is applicable for?
    • Maximum Phase system
    Minimum Phase system
    All pole system
    All zero system





  • 10) A non sinusoidal signal has Vpp 2v is represented using 128 level quantizer has SNR of ?
    • 46.8dB
    40.8dB
    52.8dB
    56.8dB





  • 11) A modulated signal of the form 6cos(Wc.t+3/4sinWm.t) has total power of
    • 36 W
    18 W
    72 W
    54 W





  • 12) Minimum Number of NAND gates required to implement XOR?
    • 4
    5
    9
    10





  • 13) A periodic signal of the form 5cos100pt+6sin200pt has a Nyquist Frequency
    • 50Hz
    100Hz
    150Hz
    200Hz





  • 14) VSWR of a Perfectly Mismatched line?
    • 8
    zero
    1
    100





  • 15) A GEOsynchronous Satellite will lie with?
    • 0 degrees inclination with equitorial plane
    some non zero angle inclination with equitorial plane
    will not lie in equitorial plane
    none





  • 16) Matrix A has Multiplicity of ?
    • 4
    3
    2
    1





  • 17) which modelling has highest level of Abstraction
    • Gate Level
    Switch Level
    Data Flow
    Behavioral





  • 18) Which architecture support variable length instruction type
    • CISC
    RISC
    both a & b
    none





  • 19) Which filters are stable
    • FIR
    IIR
    Both
    none





  • 20) Find Rth of following circuit in ohms
    • 4
    3
    5
    10





  • 21) If cache has access time 120nsec hit ratio 0.8 and main memory access time 400nsec then average access time
    • 176ns
    276ns
    576ns
    520ns





  • 22) GPS system of INDIA called as
    • GALILEO
    GLONASS
    GAGAN
    COMPASS





  • 23) In BSR mode of 8255 which port bits are set/reset?
    • Port A
    Port B
    Port C
    All





  • 24) Intrinsic concentration of Ge is 1.5*10^10 doped with donor concentration of 10^9 then at thermal equilibrium acceptor Concentration should be
    • 1.5*10^11
    2.25*10^11
    1.5*10^9
    2.25*10^9





  • 25) An EM wave in free space having E=4i+4j+2k is normally incident on a plane y=0 having ?r=4 then transmitted wave?
    • 4i+j+4k
    4i+4j+k
    4i+j+2k
    4i+j+k





  • 26) A system of the form
    • Controllable & Observable
    Not Controllable & Observable
    Controllable & Not Observable
    Not Controllable & Not Observable





  • 27) QAM is a
    • Phase Modulated signal
    Amplitude Modulated signal
    both
    none





  • 28) A DSB-SC signal having message frequency 500Hz is passed through filter having upper sideband resultant signal will have bandwidh of
    • 1000Hz
    500Hz
    250Hz
    2000Hz





  • 29) In RS flipflop when both inputs are high output will be ?
    • Toggled state
    Logic 1
    Logic 0
    Indeterminant state





  • 30) According to final value theorem Laplace transform will have value
    • 0
    Infinity
    1
    -1





  • 31) In a TEM mode ____ is perpendicular to the direction of propagation
    • Electric Field
    Magnetic Field
    both
    none





  • 32) Which of the following is the orbital effect in satellite communication
    • Power failure
    dispersion effect
    multipath effect
    sun transit-outage





  • 33) If then
    • 2u
    6u
    u
    3u





  • 34) keyword $strobe is used in verilog
    • to execute only after other statements in same time unit are executed
    to enable communication between blocks
    to act as trigger
    to invoke lower blocks





  • 35) Impedance in parallel RLC circuit is
    • Resistive, Maximum
    Reactive, Minimum
    Resistive, Minimum
    Reactive, Maximum





  • 36) For which IIR filter magnitude has ripples in passband
    • Butterworth
    Chebyshev Type-1
    Chebyshev Type-2
    elliptical





  • 37) In IOS model which layer deals with architecture of system
    • Physical Layer
    Network Layer
    Transport Layer
    Security Layer





  • 38) The orbital period of a satellite in circular orbit of radius R from center of earth is proportional to
    • R^1/2
    R^3/2
    R^2
    R





  • 39) In PN junction Diode Reverse saturation current(Io) at 10 degree C is 10uA at 40 degrees what will be Io
    • 40uA
    80uA
    20uA
    10uA





  • 40) In BJT which Stability bias technique gives High Stability
    • Fixed Bias
    Collector to Base Bias
    Fixed Bias with emitter resistance
    Self Bias





  • 41) In a wave guide dominant mode will have
    • Min Cut-off Frequency
    Max Cut-off Frequency
    No Cut-off Frequency
    none





  • 42) A system has a characteristic equation S^3 + 2S^2 +1=0
    • Absolutely Stable
    Marginally Stable
    Unstable
    none





  • 43) ASK modulated signal is transmitted in free space as data packets of 5 blocks, each block consists of 10bits of duration 1ms will have Bandwidth
    • 200KHz
    100KHz
    400KHz
    50KHz





  • 44) An FM signal have Frequency deviation of 200Hz and message signal frequency of 500Hz will have figure of merit
    • 6
    3
    12
    4





  • 45) Carry of Full Adder is also called as Boolean function of
    • Majority Voting
    Minority Voting
    Don't care
    High Z





  • 46) Slow wave structure are used in TWT to
    • Reduce Electron beam speed
    Reduce RF speed
    Reduce Gain
    Reduce Bandwidth





  • 47) In which of the following tracking Radars antenna beam is continuously rotated
    • Sequential lobing
    Conical scan
    Mono pulse tracking radar
    none





  • 48) Which of the following is a non blocking assignment statement in Verilog HDL
    • =
    ?
    <=
    >>





  • 49) Number of equations required to solve a network having 6 Branches and 4 nodes
    • 2
    3
    4
    6





  • 50) In a BJT Vbe=0.7v Vce=0.2v operates in
    • Active mode
    Saturation mode
    Cutoff mode
    Inverse active mode





  • 51) A series RL circuit have R=4 ohms and Xl=3 ohms with voltage source of 5V have apparent power of circuit
    • 5 W
    2.5 W
    4 W
    10 W





  • 52) When Compared to BJT. FET has
    • Low Bandwidth
    High Bandwidth
    Low input Impedance
    High Gain





  • 53) The Circuit will act as
    • High Pass Filter
    Band Pass Filter
    Low Pass Filter
    Band Stop Filter





  • 54) Radiation resistance of a Hertizian dipole in ohms
    • 36.5
    73
    80
    100





  • 55) Response of a system for unit step input is 1. The response of unit ramp will be
    • u(t)
    tu(t)
    1
    t^2u(t)





  • 56) Probability of error for BFSK is given by

    • c1(e(x)+xe(x))
    (c1+xc2)e(-x)
    (c1+xc2)e(x)





  • 57) Indirect method of Wide Band FM generation called as
    • Armstrong Method
    Balanced Modulator
    Voltage Controlled Oscillator
    Square law modulator





  • 58) given x(y+wz)=xy+xwz
    • Current address
    Next Instruction address
    Past Instruction address
    Address of Accumulator





  • 59) Z{x[n-k]}


    • X[z]
    zX[z]





  • 60) Given circuit will have time constant of
    • L/R
    2L/R
    L/2R
    L/4R





  • 61) To move data to the external memory which command is used in micro controller
    • MovC
    Mov
    MovX
    MVI





  • 62) Fabrication of buried layer n-p-n transistor process involves is a) lithography b) epitaxy c) diffusion d) oxidation
    • abcd
    acbd
    adbc
    acdb





  • 63) which power amplifier has maximum efficiency is
    • Class A
    Class B
    Class A transformer coupled
    Class D





  • 64) Entropy of 5 symbols having probability 1/2,1/8,1/8,1/8,1/8
    • 5
    2
    3
    4





  • 65) A Counter is designed to count following states 000, 001, 010
    • mod 2
    mod 3
    mod 4
    mod 5





  • 66) Signal have period cos(pt/3)+sin(pt/4)
    • 6
    8
    24
    12





  • 67) Inductance of Inductor having 30 turns is 8H if turns reduced to 15 the inductance will be
    • 16H
    2H
    32H
    64H





  • 68) output voltage of following circuit
    • -20V
    20V
    5V
    -10V





  • 69) An EM wave of the form E=5cos(10^8t-3z) in a medium has ?r
    • 9
    3
    81
    27





  • 70) Nyquist plot is a
    • Cartesian Plot
    Logarithm Plot
    Spectrum
    polar plot





  • 71) Coding gain is
    • Voltage gain
    Current gain
    Power gain
    Energy per bit saved by using special codes to achieve same BER as uncoded





  • 72) Number of 1k*4 ICs required to form 8k*8
    • 2
    8
    16
    12





  • 73) which of the following is a microwave antenna
    • Rhombic Antenna
    V-antenna
    Log-antenna
    Horn antenna





  • 74) Value of -Vx in the shown circuit such that maximum power is delivered through Rl
    • 50V
    -50V
    100V
    -100V





  • 75) An 8085 executes following instructions 2810 LXI H,30B0H 2813 DAD H 2814 PCHL what will be values of PC, HL at the end of this code
    • PC=2716H ,HL=30B0H
    PC=30B0H , HL=2716H
    PC=30B0H , HL=30B0H
    PC=6160H , HL=6160H





  • 76) In a PI controller by addition of a pole result in
    • System stability Increases and Steady state error Increases
    System stability decreases and Steady state error Increases
    System stability Increases and Steady state error decreases
    System stability decreases and Steady state error decreases





  • 77) In a transmission line having source power of 100W having Zo=50 ohms power delivered to load of 150 ohms is
    • 25 W
    75 W
    50 W
    100 W





  • 78) Out put signal of the following circuit will have period
    • 2msec
    1msec
    100usec
    200usec





  • 79) In Transformer the losses that vary with load current
    • Core loss
    Hysterisys loss
    Eddy current loss
    Copper loss





  • 80) In an n-channel MOSFET parameters Vtn=2V, Kn=1ma/v2 Vgs=5V and Vds=6V then Id is
    • 5mA
    6mA
    9mA
    3mA
    JavaScript Timer
    at

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