** Company: ** Cognizant Technology Solutions

1)Kirchoff’s nodal equations based on the principle of

a)conservation of energy

b)conservation of charge

c)conservation of power

d)impedance matching

2)networks connected in series following pairs are most suitable for

1. Abcd parameters

2. Z parameters

3. Y

4. H

3)For ideal filter , phase characteristics are

1. Line

2. Exponential

3. Logarthimic

4)Quality factor of rlc series ckt is

5)If geta=1, the roots of cequ are

1. Real

2. Imaginary

3. Real and repeated

4. Comp and conjugate

6)For a 6db attenuator , if input power is 100MW ,o/p power will be =?

7)F(t)=t e at, F(S)=?

8)F(S)=1/(s+a)2, f(t) =?

9)For a perfectly matched tx line , reflection coefficient=?

10)Radiation pattern of isotropic radiator is

1. Figure of eight

2. Circular

3. Ellipse

4. Sinx/x function

11)Which of the following modulation is non linear

1. A.M

2. SSB

3. FM

4. PM

12)Amplitude limiter essentially a

1. Square ckt

2. Clipper

3. Clamper

4. Rectifier

13)Waveguide acts as

1. Lpf

2. Bpf

3. Hpf

4. Apf

14)x-band rangeis

15)reflection coefficient is zero , then the line is

1. Open ckt

2. Short ckt

3. Infinite

4. Terminated by 50ohms

16)Which of the following microphone provide high directivity

1. Carbone

2. Condenser

3. Ribbon

4. Crystal

17)Dynamic memory cells are constructed using

18)Which of the following is most efficient

1. Ppm

2. Pdm

3. Pam

4. Qam

19)Which of the following has higher bandwidth

1. Pam

2. Pdm

3. Ppm

4. Am

20)Essential channel capacity is a measure of

21)Lossless line condition is?

22)Typical bit rate of keyboard devices ?

23)16 in octal s/m is?

24)No of bits represents 16 is

25)16 bit width ,8085 mapps ans 64kilobytes

26)Which of the following flipflop doesn’t have race problem?

27)Memory word size of 8085 microprocessor?

28)Flip flop used in shift register

29)And gate

30)Static electricity is formed for?

31)Cc has current gain and input impedance ?

32)Dominant mode TE10

33)Wave length in waveguide equal to ,greater than , lessthan ,independent of free space wave length

34)Half adder has how many ips and ops

35)Parallel to serial converter

36)Semiconductor memories

1. Volatile

2. Non volatile

37)Magnetron is

1. Highpower microwave oscillator

2. Lowpower microwave oscillator

3. High gain amplifier

4. Low power amplifier

38)Bethe-hole coupler uses

1. Ferrite material

2. Dielectric

3. Gunn diode

39)Power gain=40

Voltage gain=200

Current gain=?

40)Bandwidth =resonant frequency/qualityfactor

41)Differentiation of u(t)?

42)Freespace impedance?

43)Resonant frequency of rlc ckt is ?

44)Tfunction=k(s+1)/s(s-2+j3)(s-2-j3), no of poles=?

45)Tfuncion 1-s/1+s , it is known as

1. Low pass system

2. All pass system

3. High pass system

4. Band pass system

46)G=k/s2(1+sT)then order and type=?

47)Which of the following component is passive and reciprocal

1. Circulator

2. Isolator

3. Pin diode attenatur

4. Direction coupler

48)Broad side array interelement phase shift is

1. 180

2. 90

3. 0

4. 45

49)R=100ohms,C=100pf, TIME CONST=?

50)Isotropic antenna gain is

1. 0db

2. 6db

3. 3db

4. 10db

51)In one timeconstant the final value increases by _____________value

52)ABCD PARAMETERS of ELECTRICAL SYMMETRY

Ad-bc=1

53)s-equation of L DI/DT

1. 1/ls

2. 1/ls2

3. Ls

4. Ls2

54)In a CE amplifier ,if a C.E voltage increase

55)Transfer function has 2poles on L.HS PLANE and 2zeros on r h s plane this results

1. Lpf

2. Hpf

3. Bpf

4. Allpass

56)The gain at corner frequency is?

57)t.v s/m am- picture,fm-sound

58)code used in teleprinter

59)bandwidth of telephoneis

60)bit is aunit of

61)when 2 nlw are connected in parallel

z-parameter add

h-paramete

y-parameter

abcd parameter

62)beamwidth of antenna is

1. Inversely Proportional aperturelength

2. Directly proportional aperture length

3. Square root of frequency

4. Independent of aperture length

63)Convolution of two u(t)?

64)T function H(s)=1/(s+1),h(f)=?

65)Typical q factor of crystal oscillator

66)In pnp transistor saturation current is due to

67)When both junction of a transistor is forward biased then it is said to be in

68)50ohms line matched to 200 ohms load through quarter wavelength transmission , the characteristic impedance of matched line should be

1. 75ohms

2. 100ohms

3. 200ohms

4. 50ohms

69)F(s)=1/s2, then f(t)?

70)Fourier series expansion of a even periodic function contains ?

1. Cosine and const term

2. Only constant terms

3. Sine terms and constants

4. Only sine terms

71)If ip of ckt is sine , the steady state op willbe exponentially decay with time const,sin , damped sinusoidal

72)Power gain of emitter follower ?

73)Highest voltage gain can be obtained from

1. Cc

2. Ce

3. Cb

4. Ce and cb

74)Differentiation of time domain is equal to

1. Division by s in freq domain

2. Multiplication by s in freq domain

3. Multiplication by e-st

4. Multiplication by 1/e-st

75)Standard rect waveguide width to height ratio

1. 3:1

2. 3:2

3. 2:1

4. 1:2

76)Which is micro wave oscillator

1. Magnetron

2. Twt

3. Two cavity klystron

4. Laser

77)If transmission line open ckt then vswr?

78)Pn junction reversebiased then,

79)Hall effect used to measure?

80)P type semiconductor properties?