Thursday, 4 September 2014

ISRO Mock Test 3


ISRO MOCK TEST 3 ISRO Model Test 3
Timer: minutes left






 ISRO Important concepts - Click Here



  • 1) Which of the following is not true about autocorrelation function Rxx(T) ?
    • Rxx^*(T)=R(-T)
    Rxx(0)=MeanSquare=Power
    FT{Rxx(T)}=PSD
    Rxx(T)>Rxx(0)








  • 2) IIR Filter which has maximally flat passband response ?
    • Butterworth
    Chebyshev-Type1
    Chebyshev-Type2
    Equiripple








  • 3) Fourier Transform of u(t) ?
    • 2/jw
    πδ(w)
    1/jw + πδ(w)
    1/jw








  • 4) Class B complementary symmetry amplifier consists of____ transistors ?
    • 2-NPN transistors
    2-PNP transistors
    1-PNP, 1-NPN transistors
    none







  • 5) In p+n junction diode fermi-level on p-side will be
    • Close to valency band
    in conduction band
    close to conduction band
    in valency band







  • 6) 8-PSK has Bandwidth efficiency of
    • 0.5
    1
    1.5
    2







  • 7) AM signal is added to SSB-Suppressed Carrier signal (lower side band)having Amplitude twice of AM and out of Phase by 180 degrees then resulted signal will be
    • PM
    FM
    DSB
    AM







  • 8) Skin Resistance Rs in terms of Skin Depth δ
    • 1/δσ
    2/δσ
    σ/δ
    δ/σ







  • 9) Complex number i^i?
    • exp(π/2)
    exp(-π/2)
    exp(π)
    iexp(π/2)







  • 10) A n-bit Twisted Ring Counter will have?
    • n states
    2n states
    4n states
    8n states







  • 11) Steady state error of a type'0'system with step input
    • 0
    ∞
    1/1+Kp
    1/Kv







  • 12) Range of VSWR?
    • (0 1)
    (0 ∞)
    [1 ∞)
    [0 1]U (1 ∞)







  • 13) Which of the following memories has least access time
    • Cache
    RAM
    ROM
    CD







  • 14) A Radar having PRF 500KHz is used to track 3 targets simultaneously received echo signals after 1.5us 2.5us 3us which targets can be tracked perfectly?
    • Target1 only
    Target 1,2
    Target 2,3
    Target1,2,3







  • 15) Keyword used in Data flow modeling in Verilog HDL?
    • always
    assign
    net
    cmos







  • 16) Which of the following DC motors should not be run in no load condition ?
    • Series motor
    Shunt motor
    Compound Motor
    none







  • 17) Resistor has following color strips on it Red, Yellow, Green, Gold its resistance will be
    • 42K ohms, ∓5%
    42M ohms, ∓2%
    24K ohms, ∓10%
    2.4M ohms, ∓5%







  • 18) Bluetooth operate in ____ ISM band
    • 2.4Ghz
    3Ghz
    2.8Ghz
    3.2Ghz







  • 19)Type of Modulation used in GSM
    • TDMA, FHMA
    FDMA, FHMA
    TDMA, OFDM
    FDMA, FHMA







  • 20) System having Impulse response of exp(at)
    • Stable
    Un Stable
    Cannot be determined
    Neither a nor b







  • 21) A two stage CB Amplifier has voltage gains of 10 & 50 then overall gain
    • 10
    50
    60
    500







  • 22) N channel FET when compared to P channel FET has
    • High Mobility
    Low Mobility
    Large Size
    Low Package Density







  • 23) Wave incident in to perfect conductor?
    • Completely Transmitted
    Partially Transmitted
    Completely Reflected
    none







  • 24) Differential equation complementary solution will be

    • C1cos(2x)-exp(2x)C2sin(2x)
    C1exp(2x)+C2exp(-2x)
    C1cos(2x)+C2sin(2x)
    exp(-2x)C1cos(2x)+C2sin(2x)







  • 25) Function f(A,B) = π(0,1,2,3)=?
    • 1
    x
    0
    none







  • 26) Compensator of the form is ____ type


    • Lag
    Lead
    Lag-Lead
    none







  • 27) Directional Coupler has a scattering matrix of order
    • 2
    3
    4
    none







  • 28) Gunn diode works on the principle
    • Thermionic Emmision
    Tunneling
    Avalanche Breakdown
    Transfered electron effect







  • 29) In which of the following display types of Radar parameters are presented in polar co-ordinates?
    • A-scope
    B-scope
    Range-Height Indicator
    Plan Position Indicator







  • 30) In a Bistatic FMCW Radar which of the following components is used to avoid leakage from transmission section entering in to receiver section
    • Duplexer
    Isolator
    Directional Coupler
    Wave Guide







  • 31) 10 base 2 Ethernet uses which medium, topology
    • Coaxial cable, bus
    Fiber, bus
    Fiber, star
    Coaxial cable, star







  • 32) In OSI model which layer deals with error control
    • Physical Layer
    Network Layer
    Data Link Layer
    Application Layer







  • 33) If single stage RC coupled Amplifier has upper cut off frequency Fh then 3 stage cascaded Amplifier will have Fh' =
    • 0.39Fh
    0.64Fh
    0.51Fh
    0.43Fh







  • 34) Integral
    • 8/15
    4/15
    8π/15
    4π/15







  • 35) Which of the following diodes can be used to generate Amplitude Modulated signal at High Frequency
    • PN diode
    Zener diode
    Tunnel Diode
    PIN diode







  • 36) As temperature increases Zener breakdown voltage
    • decreases
    increases
    uneffected
    none







  • 37) In Schottky transistor Schottky diode is connected between
    • Collector and Base
    Emitter and Base
    Emitter and Collector
    none







  • 38) Laplace Transform of (t-a)u(t-a)
    • exp(-as)
    exp(-as)/s
    exp(-as)/s^2
    2exp(-as)/s^3







  • 39) In DIT-FFT algorithm Bit reversed sequence is taken in
    • Frequency domain
    Time domain
    both
    none







  • 40) When Sine wave is given as input to following circuit what will be output
    • Sine wave
    Half rectified wave
    Cosine wave
    Full rectified wave







  • 41) For a system to be linear it should satisfy ____ condition/s
    • Homoginity
    Superposition
    Both a and b
    none







  • 42) Nyquist plot of open loop transfer function is shown in the figure it's Gain Margin
    • 3
    4
    2
    5







  • 43) If JK-flipflop is converted to D-flipflop then ____ gate should be placed at K-input
    • NOT
    AND
    OR
    XOR







  • 44) 2's complement of the 8bit binary number 00000010
    • 11111111
    11111001
    11111101
    11111110







  • 45) Carry of Full Adder using 2 Half Adders is obtained by performing ____ operation between individual carry's of two half adders each
    • AND
    OR
    NAND
    XOR







  • 46) Scattering Matrix elements of an Isolator will be
    • S11=0, S12=1, S21=0, S22=1
    S11=1, S12=1, S21=0, S22=0
    S11=0, S12=0, S21=0, S22=0
    S11=1, S12=0, S21=1, S22=0







  • 47) Following Circuit will have ____ oscillations
    • Undamped
    Underdamped
    Critical damped
    overdamped







  • 48) Dual of the circuit shown will have
    • Current Source in parallel with G in parallel to L parallel C
    Voltage Source in parallel with G in parallel to L parallel C
    Voltage Source in parallel with G in parallel to series combination of C and L
    Current Source in parallel with G in parallel to series combination of C and L







  • 49) Capacitance of a capacitor with out dielectrics is 4uF when dielectrics of constant K=4 is placed then capacitance is
    • 1uF
    4uF
    16uF
    8uF







  • 50) An Auto-Transformer is always ____
    • has single winding
    has Double winding
    provides Electrical Isolation
    Have High losses







  • 51) In 8051 on Reset Stack Pointer has address
    • 00 H
    07 H
    Garbage Value
    none







  • 52) In DC generator AC Voltage is converted to DC by using
    • Armature Winding
    Commutator
    Stator
    Rotar







  • 53) In Switch level modeling of Verilog HDL cmos takes how many arguments
    • 2
    3
    4
    1







  • 54) Basic Keyword/s of Behavioral modeling of Verilog HDL
    • always
    initial
    both
    none







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







  • 56) A super heterodyne receiver has Q=sqrt(28) Fsi=2Khz, Fs=1Khz, IRR=
    • 4
    6
    5
    8







  • 57) Which of the following modulation used in video transmission
    • SSB
    FM
    PM
    VSB







  • 58) 4bit counter counts from 0000 to 1111 after 2061 clock pulses state of counter
    • 1100
    1110
    1101
    1111







  • 59) A 3 to 8 decoder act as ____ code converter
    • Excess 3
    Binary to Decimal
    Binary to Octal
    Binary to Hexadecimal







  • 60) Two identical FET s have Transconductance g and drain resistance r when these FET s are connected in parallel then equivalent g, r
    • g/2, 2r
    g, r
    2g, 2r
    2g, r/2







  • 61) Output of following circuit will be
    • A.B
    A(+)B
    A+B
    A(.)B







  • 62) At a given probability of error, coherent BFSK inferior to coherent BPSK by___dB
    • 6
    3
    0
    2







  • 63) Content of SP after execution of following code LXI SP, EFFFH CALL 3000H 3000H: LXI H, 3CF4H PUSH PSW SPHL POP PSW RET
    • 3CF0H
    3CF8H
    EFF0H
    EFFFH







  • 64) In TDM five signals are transmitted on same carrier frequency with message signals of frequencies 500hz, 1Khz, 2Khz, 2.2Khz, 2.5Khz. Minimum Bandwidth required for transmission
    • 2.5Khz
    10Khz
    12.5Khz
    20Khz







  • 65) To avoid diagonal clipping in envelop detector having Fc=1Mhz, Fm=1Khz what should be the possible value of RC
    • 1us
    1ms
    2ms
    100us







  • 66) In a BJT Ic=1mA Ib=10uA B=50, Transistor in
    • Active
    Cutoff
    Saturation
    Inverse Active







  • 67) Voltage Series Feedback of BJT results in
    • Input Impedance Increase, Output Impedance decrease
    Input Impedance Increase, Output Impedance Increase
    Input Impedance decrease, Output Impedance decrease
    Input Impedance decrease, Output Impedance Increase







  • 68) In which mode of operation magnetron produce sustained oscillations
    • 0-mode
    π/2-mode
    π-mode
    π/4-mode







  • 69) Transit time of reflex Klystron in mode-2
    • 3/4
    1 3/4
    2 3/4
    3 3/4







  • 70) In the figure shown before closing switch circuit was in steady state just after closing switch current through 5 ohm resistor
    • 5/3 A
    1 A
    0 A
    15/8 A







  • 71) System of the form Y(n)=nX(n+2)
    • Causal and Stable
    non Causal and unStable
    non Causal and Stable
    Causal and unStable







  • 72) Find period of f(t)= cosπt + sin3t
    • 1/2
    3/2π
    Cannot be determined since it is aperiodic
    none







  • 73) Code efficiency of DMS system has four symbols of probability P(x1)=1/2, P(x2)=1/4, P(x3)=P(x4)=1/8 using Shanon-fano coding
    • 50%
    100%
    25%
    75%







  • 74)In the following circuit find Current through 8 ohms in Amp
    • 7/8
    8/7
    49/64
    6/7







  • 75) In 8085 which Interrupt is Non Maskable
    • RST 5.5
    RST 4.5
    RST 6.5
    RST 7.5







  • 76) A system defined by has Transfer function
    • 1/S+1
    S/S-1
    1/S-1
    S/S+1







  • 77) In ADM step size, SNR when compared to DM
    • Fixed, Low
    Variable, High
    Fixed, High
    Variable, Low







  • 78) Bits 0,1 are equiprobable pdf response of respective bits at Matched filter receiver as shown, Probability of error will be
    • 1/8
    1/16
    1/24
    1/32







  • 79) Transmission line as shown will have input impedance of
    • 60
    40
    90
    30







  • 80) An RS code (255,223) can correct errors up to
    • 255
    223
    32
    16
    JavaScript Timer
    at
    Labels: , , , , ,

    No comments:

    Post a Comment

    Subscribe to: Post Comments (Atom)