1. A Si ingot is doped with 1016 arsenic atoms cm3. Find its fermi-level from bottom of the conduction band at room temperature (300 when effective density of states of silicon are 2.8x1019 cm-3 options are

0.105 eV

0.206 eV

0.354 eV

0.456 eV

2. The electron density of a n-type semiconductor is proportional to . E .

<img src='./qimages/3399-2.jpg'>

3. The correct expression of the following triangular wave is 14 2

<img src='./qimages/3399-3.jpg'>

4. The modulus of the following complex number is given by

<img src='./qimages/3399-4.jpg'>


5. Which one of the below referred figure represents the cut off of npn or pnp transistor

<img src='./qimages/3399-5.jpg'>

6. The full scale output of a 10 bit DAC is 5V. The resolution is

5mV

10 mV

2.5 mV

20 mV

7. The contents of accumulator after the execution of the following instruction will be MVI A7H ORA A RLC

CFH

4FH

4EH

CEH

8. The following statement of

X does the same as









9. Pointer arithematic cannot be performed on

Dangling pointer

Uninitialized pointers

Array name

Void pointer

10. A wave is propagated in a parallel -plane waveguide. If the frequency is 6 GHz and the plane separation is 3 cm then the cut off wavelength for the dominant mode will be

3cm

6cm

12cm

9cm

11. The noise density of a pink noise is proportional to

f

1/F

f2

1/f2

12. A high frequency signal is frequency modulated by n number of modulating signals. The ideal number of sidebands in the modulated signal will be

n

2 n

4 n

Infinite

13. The material LiNbO3 is used in the manufacturing of the following device

UJT

LED

SCR

Indirect -Modulator

14. A 50 n strain gauge of gauge factor 2 is connected to the first arm of a wheat stone bridge. Under no strain condition, all the arms have equal resistance. When the gauge is subjected to a strain, the second arm resistance has to be changed to 50.5 n to obtain a balance. The value of strain is

0.0005

0.005

0.05

0.5

15. A negative feedback control system whose open loop transfer function has feedback transfer function can be replaced by a single block with transfer function
<img src='./qimages/3399-15.jpg'>

16. Which of the following statements are correct for Tunnel Diode
1 impurity atom in 103 atoms
Very high doping in both p and n regions
1 impurity atom in 108 atoms
used as a voltage controlled devices Out of the above,

the following is the correct answer

and are correct

and are correct

and are correct

and are correct

17. Following statements are given for Laplace transforms 8 8 st st

<img src='./qimages/3399-17.jpg'>

Out of the above, the following is the correct answer

are correct

and are correct

are correct

none is correct

18. Negative Feedback in amplifiers

improves signal to noise ratio at the output
increases distortion
reduces impact offset voltage
increases bandwidth

Options

and are correct

and are correct

and are correct

all are correct

19. CMOS logic gates are preferred over TTL logic as
CMOS has lower power dissipation and high fan out
Needs no protection circuitry
Propagation delay is small as compared to TTL
High noise margin for higher values of VDD

Out of the above, the following is true

and

and

and

and

20. Read the following statements
The number of conditional flags in Intel's 8085 microprocessor is 5
In Intel's 8085 microprocessor, RST 7.5 interrupt transfers execution to memory location 003CH
Intel's 8086 microprocessor is a 8 bit processor available as 40 pin DIP
Intel's 8086 microprocessor is a 16 bit processor available as a 48 pin DIP

Which of the above statements are correct

and only

and only

and only

and only

21. Consider the following program segment

<img src='./qimages/3399-21.jpg'>

only and

only and

only and

only and

22. Read the following statements
The SWR is a measure of the mismatch between the load and the line.
If the load is purely reactive, SWR will be unity.
If the load is perfectly matched, the SWR is equal to infinity.
The higher the SWR, the greater the mismatch between line and load.

Which of the above are correct

only and

only and

only and

only and

23. Read the following statements regarding a superheterodyne receiver
It is suitable for most of the radio receiver applications.
In the superheterodyne receiver, the signal voltage is combined with the local oscillator voltage.
The mixer output in superheterodyne receiver may be an audio signal.
It has simple circuit as compared to TRF.

Which of the above statements are correct

and

and

and

and

24. Fiber Bragg Grating are used in the following
Wavelength filtering/Routers
Dispersion Compensators
EDFA
Photo detectors

Out of the above statements, following is true

and are correct

and are correct

and are correct

and are correct

25. Read the following statements
A system that may be described in the phase variable format is always controllable.
A system that is described in the phase variable format is never controllable.
A system that can be described in the phase variable is always observable.
A system that can be described in the phase variable format is never observable.

and

and

and

and

26.

Match the following

List I List II
n-channel Enhancement (Normally off)
p-channel Depletion MOSFET (Normally on)
n-channel FET
p-channel Enhancement MOSFET

<img src='./qimages/3399-26.jpg'>
Codes











27. Match the following

<img src='./qimages/3399-27.jpg'>

Codes










28. Match the following

<img src='./qimages/3399-28.jpg'>

29. Match the following in context of Fan out of various families

List I List II
DTL 20
TTL 30
PMOS 50
CMOS 5 to 15

Codes










30. Match among the following pair in the context of an 8085 microprocessor

List I List II
DAA Data transfer Instruction
XTHL Branch Instruction
RST Logic Instruction
ANI Arithmetic Instruction

Codes











31. Match the following

List I List II
The C construct that is used to break statement terminate the current iteration of loop is
The go to statement in C is Public equivalent to
By default members of a class Continue Statement in are By default members of a structure Private in are

Codes










32. Match the following

List I List II
VSWR Weber/m
Reflection Coefficient
Magnetic flux density Ampere/m
Magnetic field intensity

Codes











33. Match the following

List I List II
Rectangular Pulse
Double-sided Exponential
Cosine Pulse
Damped Sine

<img src='./qimages/3399-33.jpg'>

Codes











34. Match the following

List I List II
Cyclo converter (i)Fan Regulator
TRIAC (II)Relaxation Oscillator
Chopper (iii)DC drives
UJT RF heating

Codes










35. Match the following

<img src='./qimages/3399-35.jpg'>

CODES:












36. Assertion The epitaxial layer growth possesses the same crystal structure to that of the substrate on which it is grown.

Reason It can only be of similar conductivity type but possesses different value of resistivity to that of the substrate.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true
37. Assertion Cut set is that set of elements that dissociates two main portions of a network, such that replacing any one element will destroy this property.

Reason It is always not possible to trace the path from one node to any other node by travelling along the tree branch only.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true

38. Assertion A sinusoidal signal applied to the input of an ideal class A amplifier usually does not produce an exact replica of the input signal waveform.

Reason This variation is caused due to non-linearity in the characteristics of the transistors.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true

39. Assertion The output of an 8 bit A to D convertor is 80H for an input of 2.5V.

Reason ADC has an output range of 00 to FFH for an input range of -5V to +5V.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true

40. For the circuit shown below consider the two statements Assertion The circuit is sequential.

Reason There is a loop in circuit.

<img src='./qimages/3399-40.jpg'>

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true
41. Assertion The sign of the result of evaluation of modulus operator depends upon the sign of numerator only.

Reason If the denominator is negative, the result will be negative and if the denominator is positive, the result will be positive.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true
42. Assertion A wave guide directional coupler is a four-port wave guide function device that samples part of the EM wave power through the main wave guide.

Reason The direction couplers are described by coupling factor directivity and VSWR.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true

43. Assertion Phase delay distortion can be reduced to acceptable levels by using equalization on the channel.

Reason The equalizer automatically varies its delay characteristics while sampling the return signal to determine, when the channel plus equalizer delay reach proper tolerances.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true
44. Assertion In PIN photo diodes, an intrinsic layer is there, which is slightly doped with n type material.

Reason It disables us to increase the width of the depletion region to a value which is far lesser what it could be in a PN diode.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true

45. Assertion The roots of the characteristic equation must lie in the left hand s-plane for the system to exhibit a stable time response.

Reason Routh-Hurwitz criterion is a necessary and sufficient criterion for stability. An antenna is a key component of a wireless link which efficiently couples electromagnetic energy from the transmitter to free space and from free space to the receiver. An antenna is generally a bidirectional device, i.e, the power through the antenna can flow in both the directions, hence it works as a transmitting as well as a receiving antenna. An antenna acts as an interface between the radiated electromagnetic waves and the guided waves. It can be thought of as a mode transformer which transforms a guided wave field distribution into a radiated wave field distribution.

Both and are true and is the correct explanation of

Both and are true, but is not the correct explanation of

is true, but is false

is false, but is true
46. The angular distribution of the transmitted power around the antenna is generally known as

Angular pattern

Power pattern

Radiation pattern

Antenna array

47. Ultra High Frequency spectrum is defined as

30 kH. -300 kH.

3MH. -30 MH.

300 MH. 3 GH.

30 GH. -300 GH.

48. The most basic antenna element is

Hertzian dipole

Short dipole

Half wave dipole

Monopole

49. The radiation efficiency of an antenna with input power 100 W and power dissipation 1 W is

9.9.

0.99.

99.

100.

50. An antenna that is circulary polarized is

Small circular loop

Parabolic reflector

Yogi uda

Helical