Softwares (freeware)

 Softwares (freeware)

 

1) LT Spice - Download

2) TurboC emulator - Download

Note: use Alt+Tab to switch screen (programs) Alt+Enter to maximize screen

3) C for Linux in windows using cygwin - 

for 32-bit windows - Download

for 64-bit windows - Download

click next,next 

Note in cygwin search gcc,gcc+ under Devel then click on skip to install it

next search conv under Libs then click on skip to install

1) Backspace, Arrow buttons won't work in terminal

for this write your program or edit in gedit

Gedit free - Download

even clear command won't work hence use (Control+L) to clear

 

ISRO Mock Test 3

ISRO MOCK 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)

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2) IIR Filter which has maximally flat passband response ?

Butterworth
Chebyshev-Type1
Chebyshev-Type2
Equiripple

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3) Fourier Transform of u(t) ?

2/jw
πδ(w)
1/jw + πδ(w)
1/jw

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4) Class B complementary symmetry amplifier consists of____ transistors ?

2-NPN transistors
2-PNP transistors
1-PNP, 1-NPN transistors
none

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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

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6) 8-PSK has Bandwidth efficiency of

0.5
1
1.5
2

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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

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8) Skin Resistance Rs in terms of Skin Depth δ

1/δσ
2/δσ
σ/δ
δ/σ

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9) Complex number i^i?

exp(π/2)
exp(-π/2)
exp(π)
iexp(π/2)

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10) A n-bit Twisted Ring Counter will have?

n states
2n states
4n states
8n states

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11) Steady state error of a type'0'system with step input

0
∞
1/1+Kp
1/Kv

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12) Range of VSWR?

(0 1)
(0 ∞)
[1 ∞)
[0 1]U (1 ∞)

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13) Which of the following memories has least access time

Cache
RAM
ROM
CD

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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

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15) Keyword used in Data flow modeling in Verilog HDL?

always
assign
net
cmos

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16) Which of the following DC motors should not be run in no load condition ?

Series motor
Shunt motor
Compound Motor
none

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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%

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18) Bluetooth operate in ____ ISM band

2.4Ghz
3Ghz
2.8Ghz
3.2Ghz

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19)Type of Modulation used in GSM

TDMA, FHMA
FDMA, FHMA
TDMA, OFDM
FDMA, FHMA

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20) System having Impulse response of exp(at)

Stable
Un Stable
Cannot be determined
Neither a nor b

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

10
50
60
500

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22) N channel FET when compared to P channel FET has

High Mobility
Low Mobility
Large Size
Low Package Density

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23) Wave incident in to perfect conductor?

Completely Transmitted
Partially Transmitted
Completely Reflected
none

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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)

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25) Function f(A,B) = π(0,1,2,3)=?

1
x
0
none

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26) Compensator of the form is ____ type

Lag
Lead
Lag-Lead
none

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27) Directional Coupler has a scattering matrix of order

2
3
4
none

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28) Gunn diode works on the principle

Thermionic Emmision
Tunneling
Avalanche Breakdown
Transfered electron effect

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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

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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

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31) 10 base 2 Ethernet uses which medium, topology

Coaxial cable, bus
Fiber, bus
Fiber, star
Coaxial cable, star

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32) In OSI model which layer deals with error control

Physical Layer
Network Layer
Data Link Layer
Application Layer

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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

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34) Integral

8/15
4/15
8π/15
4π/15

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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

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36) As temperature increases Zener breakdown voltage

decreases
increases
uneffected
none

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37) In Schottky transistor Schottky diode is connected between

Collector and Base
Emitter and Base
Emitter and Collector
none

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38) Laplace Transform of (t-a)u(t-a)

exp(-as)
exp(-as)/s
exp(-as)/s^2
2exp(-as)/s^3

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39) In DIT-FFT algorithm Bit reversed sequence is taken in

Frequency domain
Time domain
both
none

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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

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41) For a system to be linear it should satisfy ____ condition/s

Homoginity
Superposition
Both a and b
none

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42) Nyquist plot of open loop transfer function is shown in the figure it's Gain Margin

3
4
2
5

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43) If JK-flipflop is converted to D-flipflop then ____ gate should be placed at K-input

NOT
AND
OR
XOR

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44) 2's complement of the 8bit binary number 00000010

11111111
11111001
11111101
11111110

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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

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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

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47) Following Circuit will have ____ oscillations

Undamped
Underdamped
Critical damped
overdamped

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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

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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

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50) An Auto-Transformer is always ____

has single winding
has Double winding
provides Electrical Isolation
Have High losses

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51) In 8051 on Reset Stack Pointer has address

00 H
07 H
Garbage Value
none

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52) In DC generator AC Voltage is converted to DC by using

Armature Winding
Commutator
Stator
Rotar

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53) In Switch level modeling of Verilog HDL cmos takes how many arguments

2
3
4
1

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54) Basic Keyword/s of Behavioral modeling of Verilog HDL

always
initial
both
none

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55) Circuit will act as

Low Pass Filter
High Pass Filter
Band Pass Filter
Band Stop Filter

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56) A super heterodyne receiver has Q=sqrt(28) Fsi=2Khz, Fs=1Khz, IRR=

4
6
5
8

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57) Which of the following modulation used in video transmission

SSB
FM
PM
VSB

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

1100
1110
1101
1111

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59) A 3 to 8 decoder act as ____ code converter

Excess 3
Binary to Decimal
Binary to Octal
Binary to Hexadecimal

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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

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61) Output of following circuit will be

A.B
A(+)B
A+B
A(.)B

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62) At a given probability of error, coherent BFSK inferior to coherent BPSK by___dB

6
3
0
2

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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

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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

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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

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66) In a BJT Ic=1mA Ib=10uA B=50, Transistor in

Active
Cutoff
Saturation
Inverse Active

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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

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68) In which mode of operation magnetron produce sustained oscillations

0-mode
π/2-mode
π-mode
π/4-mode

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69) Transit time of reflex Klystron in mode-2

3/4
1 3/4
2 3/4
3 3/4

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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

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71) System of the form Y(n)=nX(n+2)

Causal and Stable
non Causal and unStable
non Causal and Stable
Causal and unStable

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72) Find period of f(t)= cosπt + sin3t

1/2
3/2π
Cannot be determined since it is aperiodic
none

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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%

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74)In the following circuit find Current through 8 ohms in Amp

7/8
8/7
49/64
6/7

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75) In 8085 which Interrupt is Non Maskable

RST 5.5
RST 4.5
RST 6.5
RST 7.5

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76) A system defined by has Transfer function

1/S+1
S/S-1
1/S-1
S/S+1

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77) In ADM step size, SNR when compared to DM

Fixed, Low
Variable, High
Fixed, High
Variable, Low

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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

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79) Transmission line as shown will have input impedance of

60
40
90
30

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80) An RS code (255,223) can correct errors up to

255
223
32
16

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