Electronics and Communication Engineering (ECE)

• a)
   0.5  
• b)
   0.6  
• c)
   0.7  
• d)
   None of these

A MUX network is shown in fig.

Que: Z₂ = ?

• a)
  ab + bc + ca
• b)
  a + b + c
• c)
  abc
• d)
  

• a) 
  62Ω
• b) 
  43Ω
• c) 
  72Ω
• d) 
  81Ω

• A:

  high only when A = 0, B = 0

• B:

  high only when A = 0, B = 1

• C:

  high only when A = 1, B = 0

• D:

  high for all values of A and B

The answer is A.

Consider the following ‘3’ transfer functions.

Among these minimum phase system (s) i s/are

• a)
  1 and 2    
• b)
  1 and 3
• c)
  1 only    
• d)
  1,2 and 3

• a)
  − 200 ε₀
• b)
  − 200/ε₀
• c)
  200 ε₀
• d)
  − 240 ε₀

• a)
  1/2    
• b)
  2.20 x10^-5
• c)
  4.39 x10^-10    
• d)
  0.005

Match the list
 

List-I
Material used
A. Maganin
B. Aluminium
C. Phosphor Bronze
D. Eureka

List-II
Purpose
1. Multiplier
2. Coils
3. Discs
4. Control spring
5. Shunt

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• a)
  1.3 x 10^-7 s
• b)
  1.3 x 10^-4 s
• c)
  6.5 x 10^-8​ s
• d)
  6.5 x 10^-4​ s

• a)
  1 time
• b)
  10 times
• c)
  11 times
• d)
  infinite times

   then find 

• a)
  √3
• b)
  1 / 3
• c)
  3  
• d)
  None of these

• a)
  reciprocity theorem
• b)
  principle of maximum power transfer
• c)
  both (a) and (b)
• d)
  none of the above

The signal flow graph shown below has M number of forward path and N number of individual loops.

Q. ​What are the values of M and N ?

• a)
  M= 3 and N= 4
• b)
  M = 4 and N = 6
• c)
  M = 4 and N = 4
• d)
  M = 2 and N = 6

• a)
  d.c. ground point
• b)
  must be floating
• c)
  The most negative voltage available in the circuit
• d)
  The most positive voltage available in the circuit

The 3-terminal linear voltage regulator is connected to a 10 ohm load resistor as shown in figure. If V_in is 10 volt, what is power dissipated in the Si transistor.

• a)
  0.6 W
• b)
  2.4 W
• c)
  4.2 W
• d)
  5.4 W

 Match List-I (Combinational Circuits) with List-ll (Applications) and select the correct answer using the codes given below the lists:

List-I
A. Decoder
B. Multiplexer
C. Encoder
D. Demultiplexer

List-ll
1. Serial to parallel converter
2. Digital to analog converter
3. Parallel to serial converter
4. Analog to digital converter

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• a)
  Eddy current losses are higher
• b)
  Mass of moving system
  becomes higher
• c)
  The magnetic field produced by
  eddy currents introduce error
• d)
  Operating field is weak due to
  air cored.

• a)
  4.36
• b)
  9.8
• c)
  19
• d)
  3.13

• a)
  2x
• b)
  −2x
• c)
  2|x|
• d)
  None of these

• a)
   eclipses
• b)
   dominates
• c)
   overshadows
• d)
   subdues

• a)
  word organized
• b)
  byte organized
• c)
  nibble organized
• d)
  bit organized

With 10 V dc connected at port A in the linear nonreciprocal two-port network
shown below, the following were observed :

(i) 1Ω connected at port B draws a current of 3A
(ii) 2.5 Ω connected at port B draws a current of 2A

Q.

With 10 V dc connected at port A, the current drawn by 7 Ω connected at port B
is

• a)
  3/7 A
• b)
  5/7 A
• c)
  1A
• d)
  9/7 A

• a)
  0
• b)
  1
• c)
  ∞
• d)
  -1

• a)
  1
• b)
  2
• c)
   3
• d)
   No error

With 10 V dc connected at port A in the linear nonreciprocal two-port network
shown below, the following were observed :

Q.

For the same network, with 6 V dc connected at port A, 1Ω connected at port B
draws 7/3 A. If 8 V dc is connected to port A, the open circuit voltage at port B is

• a)
  6 V
• b)
  7V
• c)
  8 V
• d)
  9V

• a)
  impartial
• b)
  argumentative
• c)
  separated
• d)
  hostile

The pole-zero diagram of a causal and stable discrete-time system is shown in the figure. The
zero at the origin has multiplicity 4. The impulse response of the system is h[n]. If h[0] = 1,
we can conclude

• a)
  h[n] is real for all n
• b)
  h[n] is purely imaginary for all n
• c)
  h[n] is real for only even n
• d)
  h[n] is purely imaginary for only odd n

In the circuit shown below, assume that the diodes D₁ and D₂ are ideal. The average value of voltage V_ab (in
volts) across the terminals a and b is

• a)
  2 Volt
• b)
  0 Volt
• c)
  -2 Volt
• d)
  4 Volt

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• a)
  Reference input
• b)
  Reference output
• c)
  Output and feedback signal
• d)
  Input and feedback signal

• a)
   The potential biases has disappeared
• b)
  No. of holes diffusing from P-side to N-side equals the no. of electrons diffusing from N-side to P-side
• c)
  Total current crossing Junction from P-side to N-side equals the total current crossing Junction from N-side top-side
• d)
  No carriers cross the Junction

• a)
  k = 1 or 2
• b)
  k = 2 or 3
• c)
  k = 0
• d)
  None of these

For what value of k is the following function continuous  x = 0

• a)
  k = 0
• b)
  k = 1/8
• c)
  k = 1
• d)
  k = 1/2

• a)
  2
• b)
  1
• c)
  e^-1/2
• d)
  e

If saturation currents of 2 diodes are 1 µA and 2 µA.
If break down voltages of diode are same and are equal to 100 volt, what is value of current in D1.

Q.

If V = 90 volt

• a)
  0 µA
• b)
  1 µA
• c)
   1.5 µA
• d)
   2 µA    

• a)
  aS²_g (ω) and a²P_g
• b)
  aS_g² (ω) and aP_g
• c)
  aS_g (ω) and a²P_g
• d)
  aS_g (ω) and aP_g

• a)
  which has zeros only in the left-half s-plane
• b)
  which has poles in the right-half s-plane
• c)
  which has zeros in the right-half s-plane
• d)
  which has poles in the left-half s-plane

• a)
  -2 V,6/5Ω
• b)
  2 V,5/6Ω
• c)
  1 V,5/6Ω
• d)
  -1 V,6/5Ω

• a)
  83 mV
• b)
  59 mV
• c)
  43 mV
• d)
  31 mV

• a)
  1
• b)
  2
• c)
  4
• d)
  8

Find the rank of matrix 

• a)
   4  
• b)
  3  
• c)
  2  
• d)
  None of these

In circuit given if both Transistors have same VT what is the approximate value of highest possible output voltage vout if v_h, can range from 0 to V_DD, it is assumed that 0 < v_T < V_DD

• a)
  V_DD
• b)
  v_T
• c)
  V_{DD -} v_T
• d)
  0

Which of the quantities is nearest to the value of

• a)
  1
• b)
  1.001
• c)
  1.002
• d)
  1.003
• e)
  1.000006

• a)
   1 & 3
• b)
  2 & 4
• c)
  1, 3 & 4
• d)
  1,2,3 & 4

• a)
  det(A) = 7
• b)
  det(A) = 81
• c)
  det(A) = 9
• d)
  det(A) = 4

• a)
  more accurate but less stable
• b)
  less accurate but more stable
• c)
  more accurate as well as more stable
• d)
  less accurate as well as less stable

• a)
  0
• b)
  1
• c)
  2
• d)
  3

The solution of 

• a)
   y = Ae^−x + Be^4x + 3 x −4
• b)
   y = Ae^−x + Be^4x + 3 x +4
• c)
   y = Ae^−x + Be^−4x + 3x − 4
• d)
   None of these