Friday, 22 August 2014

ISRO Mock Test

ISRO MOCK TEST 1 JavaScript Timer
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 ISRO Important concepts - Click Here





  • 1) Number of states does a 4-bit Ring Counter have ?
    • 2
    1
    4
    8





















  • 2) Tunnel Diode works on the principle of ?
    • Thermionic emission
    Voltage Regulation
    BreakDown
    Tunneling





















  • 3) Compared to centre tapped Full wave Rectifier Bridge rectifier have low requirement of?
    • peak inverse voltage
    Number of diodes
    Current(rms)
    Ripple Factor





















  • 4) For maximum power transfer in a circuit having Source impedance of 5 +j3 load impedance should be?
    • 8-j3
    5-j3
    3+j5
    5+j3





















  • 5) According to maxwells equation ∇.D=
    • Q
    Pl
    Ps
    Pv





















  • 6) If a system has H(s)=1/s then unit step response
    • tu(t)
    u(t)
    t^2u(t)
    tu(t)/2





















  • 7) What will be the image frequency for signal of 1100Hz with IF=450Hz
    • 1000Hz
    2000Hz
    1500Hz
    1550Hz





















  • 8) If slope of the signal m(t) = 2cos(50t) is 50 in Delta Modulation results in
    • Slope overload error
    Granular noise error
    No error
    Quantization error





















  • 9) In a BJT Beta = 99, Icbo=10uamp, Iceo=?
    • 20ma
    2ma
    1ma
    10ma





















  • 10) Darlington pair made of two similar transistors have B=100 each then equivalent B=?
    • 1000
    100
    10
    10000





















  • 11) Following circuit have Time constant of
    • RC
    2/3RC
    3/2RC
    2RC





















  • 12) A wave guide act as?
    • Band pass filter
    High pass filter
    Band Stop filter
    Low pass filter





















  • 13) which flip-flop is called as transparent latch
    • T flip-flop
    JK flip-flop
    D flip-flop
    RS flip-flop





















  • 14) If bitrate of QPSK transmission is 4kbps then its bandwidth
    • 4Khz
    8Khz
    12Khz
    6Khz





















  • 15) A phase modulated message signal of 1Khz with modulation index of 1.5 will have Bandwidth of?
    • 4Khz
    5Khz
    2.5Khz
    1.5Khz





















  • 16) poles of absolutely stable system will lie on which side in s-plane?
    • Left side
    Right side
    at origin
    on imaginary axis





















  • 17) what should be the minimum load resistant of given circuit
    • 100 ohms
    50 ohms
    66.7 ohms
    87.6 ohms





















  • 18) Which of the following circuit act as DC Restorer or Level shifter
    • Clipper
    Clamper
    Resonant circuit
    Tank Circuit





















  • 19) In RLC series resonant circuit at Fo
    • Current will be Maximum
    Current will be Minimum
    Impedance is Maximum
    Impedance is reactive





















  • 20) When left circularly polarized signal of power 5dB is received by linearly polarized antenna then received signal strength will be
    • 0dB
    5dB
    2dB
    1dB





















  • 21) Which of the following circuit can be used to generate 1ms pulse from 1us pulse
    • BootStrap
    MonoStable Multivibrator
    Bistable Multivibrator
    Schmitt Trigger





















  • 22) Gain Margin is calculated at
    • Resonant Frequency
    Gain crossover frequency
    Phase crossover frequency
    Half power frequency





















  • 23) In PCM for a signal of 1V-pp represented by 8 bits have SNR in dB?
    • 20dB
    40dB
    48dB
    64dB





















  • 24) Message signal is passed through which block before PM to generate FM
    • Differentiater
    Integrater
    Multiplier
    Subtractor





















  • 25) A 6V zener diode with power dissipation of 300mw is connected across a load of 100ohms with source of 19V will have series Rs of ?
    • 100ohms
    200ohms
    300ohms
    500ohms





















  • 26) Following waveform when given as input to comparator output waveform will be
    • Sinewave
    Square wave
    Ramp
    Unit step





















  • 27) Following circuit has net inductance of
    • 6 H
    10 H
    7 H
    1 H





















  • 28) characteristic impedance of circuit with Zoc = 25 ohms, Zsc = 36 ohms
    • 50 ohms
    30 ohms
    100 ohms
    125 ohms





















  • 29) 7 bit Flash type ADC requires how many comparators ?
    • 128
    255
    512
    127





















  • 30) Given State Transition Matrix has eigen values A=
    R1 [10] R2 [03]
    • 1,3
    2,2
    0,4
    1,4





















  • 31) Channel Capacity of a channel having SNR=63dB and bandwidth of 5Khz
    • 15kbps
    30kbps
    45kbps
    60kbps





















  • 32) Power saving in SSB when compared to AM for u=1
    • 5/6
    6/5
    1.3
    0.2





















  • 33) When compared to BJT. FET has
    • High Input Impedance and High Gain
    High Input Impedance and Low Gain
    Low Input Impedance and High Gain
    Low Input Impedance and Low Gain





















  • 34) Common Emitter amplifier with out bypass capacitor act as
    • Current Shunt Feedback
    Current Series Feedback
    Voltage Shunt Feedback
    Voltage Series Feedback





















  • 35) Star equivalent of given Delta circuit has resistance in ohms
    • 0.6, 1.5 ,1
    1, 2, 3
    1.5, 6, 3
    1, 1.5, 9





















  • 36) Given Phase velocity of 400M meters/sec then Group Velocity
    • 2.5 * 10^8
    2.25*10^8
    3*10^8
    2*10^8





















  • 37) Race around condition occurs in
    • RS Flip-Flop R =0, S=0
    RS Flip-Flop R=1, S=1
    JK Flip-Flop J=1, K=1
    JK Flip-Flop J=0, K=0





















  • 38) Pole-Zero plot represents which compensator
    • Lead
    Lag
    Lag-Lead
    Lead-Lag





















  • 39) Which Modulation Scheme will have low Probability of error
    • ASK
    BFSK
    BPSK
    MSK





















  • 40) Modulation index of AM signal having Vmax = 4v Vmin = 2v
    • 3
    1/3
    1
    1/2





















  • 41) Which MOSFET can act in dual modes based on Gate Source voltage
    • E-MOSFET
    DE-MOSFET
    N-MOSFET
    P-MOSFET





















  • 42) Which of the following is Barkhausen criteria for oscillations
    • |AB|=1, Phase shift =180
    |AB|≠1, Phase shift = 360
    |AB|=1, Phase shift = 360
    |AB|≠1, Phase shift = 180





















  • 43) In the given circuit find the current of VCCS in amps
    • 5
    3
    2
    1





















  • 44) In Smith Chart a peg is moved along Constant R circle in Anti clock wise direction from Quadrant 1 to Quadrant 3 then Reactance becomes
    • Changes from Capacitive to Inductive
    Changes from Inductive to Capacitive
    Capacitive only
    Inductive only





















  • 45) Minimum number of NOR gates required to realize XOR
    • 4
    5
    3
    10





















  • 46) Type number of system whose H(s)=1/(S^4 +3S^3+S^2)
    • 3
    1
    2
    4





















  • 47) 2-stage amplifier formed with CE followed by CB is called as
    • Cascade
    Cascode
    Multiplier
    Transformer Coupled





















  • 48) Ideal op-amp have
    • Infinite Input Impedance
    Zero Input Impedance
    Zero Voltage Gain
    Infinite output Impedance





















  • 49) E at (1,2,1) for given V= 2x^2yz
    • 4i+2j+4k
    4i+4j+2k
    4i+4j-2k
    -(4i+2j+4k)





















  • 50) Dual of function x(y+z)=xy+xz
    • x^1 +(yz)^l=(x^1+y^1)(x^1+y^1)
    x+yz=(x+y)(x+z)
    xz+y=(x+z)(y+z)
    xy+yz=(x+y)(y+z)





















  • 51) output of following circuit
    • 100 V
    85 V
    -85 V
    -100 V





















  • 52) polarization of signal with Ex=5cos(wt-Bz), Ey=5sin(wt-Bz)
    • Linear
    Elliptical
    Right Circular
    Left Circular





















  • 53) Analog value of 4 bit Binary Weighted Resistor DAC for 1011 with Rf=1K ohms, R=10K ohms
    • -3.5 V
    -5.5 V
    -3.125 V
    -6.125 V





















  • 54) A Directional Coupler have Directivity of 30dB and Coupling of 40dB then Isolation should be
    • 30 dB
    40 dB
    70 dB
    10 dB





















  • 55) which modelling has lowest level of abstraction in VHDL
    • Behavioral
    Data Flow
    Gate Level
    Structural





















  • 56) complementary solution of
    • c1e(x) +c2e(-x)
    c1(e(x)+xe(x))
    (c1+xc2)e(-x)
    (c1+xc2)e(x)





















  • 57) Laplace Transform of cos(at)
    • 1/S^2 +a^2

    s/s^2 +a^2
    a/s^2 +a^2
    sa/s^2 +a^2





















  • 58) Program Counter holds
    • Current address
    Next Instruction address
    Past Instruction address
    Address of Accumulator





















  • 59) For pulse repetation frequency of 1Mhz un ambiguous range
    • 300 m
    250 m
    150 m
    100 m





















  • 60) A mismatched waveguide had a reflection coefficient of 1/3 then its VSWR
    • 1/2
    2
    1
    -2




















  • 61) ∫(0,∞)δ(t)cos⁡(wt)dt =
    • 0
    1
    1/2
    -1




















  • 62) which of the following cannot be realised during logic synthesis in VerilogHDL
    • *
    +
    %
    ===




















  • 63) System defined by Y(t)=tX^2(t) is
    • Linear and Time Invariant
    Linear and Time Variant
    Non-linear and Time Invariant
    Non-linear and Time Variant




















  • 64) Which of the following devices can handle High power
    • Coaxial Cable
    Transmission Lines
    Microwave Waveguide
    Optical fiber




















  • 65) Accumulator content at the end of code XRA A MVI B, #07 H ADD B loop: DEC A JC loop
    • 00H
    07H
    06H
    FFH




















  • 66) Magic T have
    • 2 port Junction
    3 port Junction
    4 port Junction
    no junction




















  • 67) Probability of getting 53 rd monday in a leap year
    • 1/7
    2/7
    3/7
    4/7




















  • 68) Operator which has least order of precedance in Verilog HDL
    • +
    %
    *
    Conditional operator




















  • 69) Z-Transform of na^nu(n)
    • z/(z-a)
    za/(z-a)^2
    z^2/(z-a)^2
    z/(z-a)^2




















  • 70) Continuous Wave Radars with out modulation can find
    • Range only
    Doppler Shift only
    both a & b
    none




















  • 71) A Gun diode have how many junctions
    • 2
    3
    4
    0




















  • 72) (Cos(wt)+iSin(wt))^n
    • Cis(wt+n)
    Cis(wt-n)
    Cis(nwt)
    Cis(wt/n)




















  • 73) Fourier Transform's weak Dirchlet condition
    • Absolute Integrability
    Finite Max/Min
    Finite Discontinuties
    all of the above




















  • 74) Draw back of MTI radar
    • can't find Range
    can't find Doppler shift
    both a &b
    Blind Speed




















  • 75) Following Device/s work on the principle of Faraday's law of rotation
    • Circulator
    Isolator
    Both a & b
    none




















  • 76) Fourier Series is defined for
    • Continuous and Periodic
    Continuous and aperiodic
    Discrete and Periodic
    Discrete and Aperiodic




















  • 77) Minimum number of Geostationary satellites are required to cover earth
    • 3
    4
    8
    9




















  • 78) Which of the following is used as power amplifier in Satellite Communication System
    • TWT
    Klystron
    Magnetron
    Gyrotron




















  • 79) Magnetron is a
    • Cross Field amplifier
    Direct Field amplifier
    Resonant Cavity
    Bunching Cavity




















  • 80) GSM operates at
    • 960Mhz
    900Mhz
    1000Mhz
    1200Mhz

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    2 comments:

    1. Unknown15 June 2016 at 04:00

      Is there any answer key for these questions?

      ReplyDelete
    2. VikramChakravorthy18 June 2016 at 02:08

      key is there but best way is try these test as many times as possible and improve your score

      ReplyDelete

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