In case of varactor diode with hyper-abrupt junction the sensitivity (S) value for  is :

For an ideal MS contact between a metal and a P-type semi-conductor. The relation between barrier height  is given by :

The Debye Length L_D is a characteristic lengh for semi-conductor and is defined as. Where, K is Boltzmann constant, T is temperature in Kelvin, q is unit electronic charge, N is impurity concentration of the substrate in per M³. ϵ_s is dielectric permittivity of silicon.

The depletion layer width at thermal equilibrium for a one-sided abrupt junction is :

Number of ways in which a Schottky defect an occur in silicon is given by : Where N = total number of atoms in a crystal of unit volume n₅ = number of Schottky defects per unit volume.

What would be system pressure of Si – MBE system in order to achieve 5 × 10⁷ cm mean free path (L) of atoms ?

Which Plasma Analytical technique involves placement of conducting probe smaller than particle mean free path directly in the plasma ?

Which gas is used in reactive plasma for etching all three i.e, silicides, silicon and silicon dioxide ?

Consider a circuit  as shown in figure :

The circuit is :

The region of convergence of the sequence 
 is :

The Fourier series expansion of a periodic function with half wave symmetry contains :

The Fourier transform of x* [-n] is :

The slew rate for a 741 is 0.5 V/µ second, the combination of maximum frequencies for an undistorted sine-wave output of 10 V peak and 1 V peak are approximately :

Which of the following is not a component of basic Phase-Locked Loop (PLL) ?

If T_J and T_A are junction temp. and ambient temp respectively θ_JC, θ_Cs and θ_SA are transistor thermal resistance, insulator thermal resistance and heat sink thermal restance respectively. The equation of maximum power dissipation is given by :

If V_ref is the output reference value and V_rs is the ideal full-scale output voltage when the digital input are all 1. Which of the following equation is correct ?

The final code after encoding data bits 1101 into 7 bit even parity hamming Code is :

The A/O gates in which an addition variable or a combination of variables can be included in the logic operation are called :

The statement which is not applicable to a More machine :

The relationship between revolution per minute(rpm), step per revolution (spr) and steps per second (sps) is given by :

What happens if Interrups INTO,TF0 and INT1 are activate at the same time ?

In the Register Indirect addressing mode, the effective address of the datum in the base reister or an index register that is specified by the instruction is.

RG-U type transmission line has an open circuit impedance of and a short circuit impedance of  ,The value of characteristic impedence is given by :

An air filled rectangular waveguide of dimension 7 × 3.5 cm² operates in the dominant TE₁₀ mode, The value of phase velocity of the wave in the guide at a frequency of 3.5 GHz is given by :

In case of Linear arrays of 'n' isotropic point sources of equal amplitude and spacing, The expression for total electric field at a large distance in the direction, 'θ' , is given by :

A sphere of radius r₁ = 30 cm has a charge density  Where p₀ = 200 pC/m³. The value of total change on the sphere is given by :

A VSB transmitter that transmits 25% of the other sideband along with wanted sideband, radiates 0.625 kW when the modulation percentage is 60%. If we want to transmit the same message by an AM transmitter then carrier pwoer (in kW) required is :

The term dispersion describe the process of :

In a FDM system, 10 channels are multiplexed. Each channel having a BW of 50 kHz, if the guard band between the channels are 1 kHz, the minimum bandwidth required for transmission is :

The main objective of CELL in a cellular mobile system is :

In the following circuit ß is in the range of 8 to 40. Rc = 11 Ω, Vcc = 200 V, VB = 10V. If the VCE (saturation) = 1.0 V and VBe (sat) = 1.5 V, over drive factor = 5. The value of power loss in the transistor is given by :

A three phase four pole induction motor is operating on an input frequency of 75 Hz and slip of 4%. If the rotor resistance of the machine is 1Ω. the torque developed by the motor is given by : (Assume the operating voltage is 415V, assuming stator voltage drop = 0) :

Insertion of negative feedback in control system affects :

For the following First Order Syatem.The value steady state error is given by :

A dual-slope integrating type of A/D converter has an integrating capacitor of 0.1 µF and a restance of 100 kΩ. If the reference voltage is 2 V, and the output of the integrator is not to exceed to 10V, the value of maximum time the reference voltage can be integrated is :

The velocity transducer consists of a moving coil suspended in the magnetic field of a permanent magnet, It is not used for measurement of velocities developed in a :

Which of the following statements is not correct about a CPLD (Complex Progammable Logic Device) ?

What is not the source of Error in a Thermocouple transducer ?

Which is not the important characteristics of thermoistors that make them extremely useful in measurement and control applications ?

Currents in the three terminals of a transistor are mostly diffusion currents which are related by the minority carrier distribution in the base region. Which of the following statements are correct ?
(a) The applied voltages control the boundary densities through the term exp (qV/kT)
(b) The base current is the difference between the emitter and collector currents
(c) In order to maximize emitter reistance, the emitter contact is usually made directly on top of the emitter
(d) Emitter Bandgap narrowing increases current gain
(e) Emitter and collector currents are given by the minority density gradients at the junction boundaries Choose the most appropriate answer from the options given below :

The small signal model of tunnel diode can be represented as :
A.
B.
C.
D.
Where R_s is resistence;
Choose the most appropriate answer from the options given below :

In which of the following techniques beam of electrons is used as a probe and the secondary radiation is X-ray
(a) LEED
(b) EMP
(c) TEM
(d) STEM
(e) EELS
Choose the correct answer from the options given below :

Which metals or alloys amongst the following, do not reduce SiO2 and are found to have poor adhesion on SiO₂ surfaces.
(a) W
(b) Mo
(c) AI
(d) TiN
(e) WSi₂
Choose the correct answer from the options given below :

Which of the following gases commonly used in CVD are pyraphoric, toxic and flammable ?
(a) Phosphine
(b) Argon
(c) Nitrogen Oxide
(d) Silane
(e) Nitrogen
Choose the most appropriate answer from the options given below :

Consider the circuit shown in the figure

Which of the following statments regarding tree are correct ?
(a) All the links of a tree together does not constitute the complement of the corresponsing tree
(b) A conncected subgraph of a connected graph is a tree if there exist (n – 1) nodes of the group
(c) A connected subgraph of a connected graph is a tree if there exists many paths between any pair of nodes in it
(d) The number of terminal nodes or end vertices of every tree are atleast two
(e) Every connected graph has atleast one tree Choose the correct answer from the options given below :

Which of the following statements are not correct ?
(a) Precision rectifiers use positive feedback to compensate for the forward drop of the diodes
(b) Precision peak detector used a capacitor to effectively lenghten the duration of the peaks
(c) Limiters may be thought of as programmable signal clippers
(d) In order to improve performace of comparators negative feedback may be used
(e) There are two basic approaches for realizing a desing : (1) using zener diodes and (2) using biased-signal diode network Choose the most appropriate answer from the options given below :

The network formed by resistors and capacitors for modifying the rate of change of gain and the phase hift is called a compensating network. Which of the following statements are not correct ?
(a) The main purpose of a compensating network is to modify the performance of op-amp circuit over the desired frequency range
(b) There are two types of op-amps : internally compensated and externally compensated
(c) 741 C is an externally compensated op-amp while 709 C is internally compensated op-amp
(d) The phase lag and phase lead are most commonly used compensating networks in op-amps
(e) Phase lag contributes a positive phase angle and phase lead a negative phase angle
Choose the most appropriate answer from the options given below :

Three major types of programmable logic are SPLD, CPLD and fpga. Each major type have many manufacturer specific subcategories. Some statements are given below related to these programmable logic devices. Which of the following statements are correct ?
(a) CPLDs have much higher capacity than SPLDs
(b) FPGAs are similar to CPLDs in their internal organization
(c) Two basic classes of FPGAs are course grained and fine grained (d) Fine grained FPGA has large logic blocks whle course-grained FPGA has much smaller logic blocks
(e) FPGAs come in package and ranging less than 1000 pins
Choose the most appropriate answer from the options given below :

The performance parameters of a logic family are required for better understanding.The following statements explain the characteristics of Digital logic family. Which of these statements are correct ?
(a) The operating speed of a logic family is determined from its propagation delay
(b) Power dissipation is inverseley proportional to switching frequency and directly proportional to cycle time.
(c) Fan in is defined as maximum number of inputs for a logic gate in a particular logic family
(d) Fan-out is defined as number of dissimilar logic gates driven by a single logic gate
Choose the most appropriate answer from the options given below :