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)

---

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

---

ISRO Mock Test 2

ISRO MOCK TEST 2

Timer: minutes left

 ISRO Important concepts - Click Here

1) Quality Factor of an RL circuit having Xl=100 ohms is 50 then R and Dissipation factor (DF) will be ?

R=2ohms, DF=2
R=0.02 ohms, DF=2
R=2 ohms, DF=0.02
R=2 ohms, DF=100

---

2) DFT of {2,2,0,1} ?

5,2+j,1,2-j
5,2-j,-1,2+j
5,2-j,2-j,1
5,2+j,-2+j,1

---

3) Minimum number of satellite views required to find exact position of a point on earth in GPS?

4
3
2
1

---

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 5cos100πt+6sin200πt has a Nyquist Frequency

50Hz
100Hz
150Hz
200Hz

---

14) VSWR of a Perfectly Mismatched line?

∞
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 ϵr=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 {u(t-a)}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 Network topology 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 100Hz 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

Q(sqrt(Eb/No))

Q(sqrt(2Eb/No))
Q(sqrt(Eb/2No))
Q(sqrt(Eb/4No))

---

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

1

2

3

4

---

59) Z{x[n-k]}

1)

2)

3) X[z]
4) 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(πt/3)+sin(πt/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

---