List of top Nanoelectronics Questions asked in Common University Entrance Test

Choose the wrong option from the following for the given statement. Statement: Electric field is conservative.

Choose the correct answer from the options given below.
A. \( \vec{\nabla} \times \vec{B} = \mu_0 \vec{J} \) represents Ampere's circuital law.
B. \( \vec{\nabla} \cdot \vec{B} = 0 \) represents magnetic monopole doesn't exist experimentally.
C. \( \vec{\nabla} \times \vec{E} = 0 \) represents the conservative nature of the electric field.
D. \( \vec{\nabla} \times \vec{A} = 0 \) represents the solenoidal condition for a vector field.

Arrange the following fabrication steps of MOSFET from initials:
(A) Metallization
(B) Oxidation
(C) Etching
(D) Diffusion/Ion implantation

The consequences of Early effect on BJT are:
(A) Effective base width reduces.
(B) Emitter injection efficiency and base transport factor increase.
(C) $\alpha$ and $\beta$ decrease.
(D) Emitter injection efficiency and base transport factor decrease.
Choose the correct answer:

(A) Tunnel diode is a heavily doped pn junction diode that exhibits negative differential resistance.
(B) Stability factor (S) is the maximum for a voltage divider bias circuit.
(C) The operational amplifier works as a comparator circuit in open loop configuration.
(D) Biasing is done to set the quiescent point of the transistor in the middle of the DC load line.
Choose the correct statements from the options given below:

Arrange the following devices in increasing order of their input resistances:
(A) MOSFET
(B) BJT
(C) JFET
(D) PN junction diode

Express \(v_{\text{out}}\) in terms of \(v_{\text{in}}\) for the given circuit, assuming the op-amp is ideal.

Considering the op-amp to be ideal, the \(v_{\text{out}}\) is expressed as:

In amplitude modulation:
(A) The envelope detector operates properly, only if $(1/f_c) \leq RC \leq (1/f_m)$
(B) Vestigial sideband modulation is used in television broadcasting.
(C) Selective fading produces more distortion in SSB-SC systems than in DSB-SC.
(D) Efficiency of a suppressed carrier system is 100%, whereas in AM the maximum efficiency is only 33.3%.
Choose the correct answer from the options given below:

The transmission efficiency of an ordinary AM signal with a modulation percentage of 80% is:

Consider the following statements:
(A) Built-in potential across a diode reduces with increase in temperature.
(B) Electron concentration of n-type semiconductor equals intrinsic concentration at Curie temperature.
(C) Drain current of MOSFET is a positive temperature coefficient (PTC).
(D) Collector current of BJT has a PTC.
Choose the correct statements:

The output frequency for an 8-bit Johnson counter is ......... if the applied input frequency is 256 GHz.

The number of flip-flops required to implement a MOD-31 counter are:

The product of maxterms for the given boolean function is: \[ Y = ab + a'c \] Choose the correct answer from the options given below:

Characteristic equation (\( Q_{next} \)) is provided for the different flip-flops:
(A) \( Q_{next} = S Q + R Q' \)
(B) \( Q_{next} = S Q' + R Q \)
(C) \( Q_{next} = T Q' + T' Q \)
Choose the correct answer from the options given below:

Determine the Y11 and Y12 parameters for the circuit given below:

In a circuit, the maximum power will be transferred only if the load resistance is equal to ...........

Choose the correct statement from the options below:

The voltage across the inductor for \( t > 0 \) in the given circuit is:

Determine the node voltages \( v_1 \) and \( v_2 \) for the given circuit:

Evaluate the mesh current \( i_1 \) in the given circuit: