Electronics and Communication Engineering (ECE)

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)
  0.77 eV
• b)
  0.67 eV
• c)
  0.57 eV
• d)
  0.47 eV

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

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

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

• a)
  TE₁₀ < TE₂₀ < TE₀₁ < TM₁₁
• b)
  TE₁₀ < TE_o1 < TE₂₀ < TM₁₁
• c)
  TE ₁₁ < TE₀₁ < TE₂₀ < TM ₁₀
• d)
  TE₀₁ < TE₁₀ < TE₂₀ < TM₁₁

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

• 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

In the circuit shown below, the voltage source has been connected for a long time enough for steady state condition to be reached. At time t=0, switch S is opened. Then open circuit voltage across AB is

• a)
  V.e ^{- (R / L)}
• b)
  V + V.e^-R/L
• c)
  V
• d)
  o

Consider a uniform rod of mass M and length L and an impulse J imparted to it at the  position 'P' shown. What would be its angular velocity ?

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  1
• b)
  2
• c)
  4
• d)
  8

Which one of the following is a property of the solutions to the Laplace equation : 

• a)
  The solution have neither maxima nor minima anywhere except at the boundaries
• b)
  The solution are not separable in the coordinates
• c)
  The solution are not continuous
• d)
  The solution are not dependent on the boundary conditions

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

   then find 

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

• a)
  a
• b)
  b
• c)
  c
• d)
  d

Find the rank of matrix 

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

• a)
  
• b)
  
• c)
  
• d)
   None of these

• a)
  
• b)
  
• c)
  
• d)
  

 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

Match List-I (Frequencies spectrum) with List-II (Frequency range) and select the correct answer using the codes given-below the lists:
List-I
A. Extremely low frequency
B. Low frequencies
C. Voice frequencies
D. Very low frequencies 
List-II
1. 30-300 kHz
2. 300-3000 Hz
3. 3-30 kHz
4. 30-300 Hz

• a)
  A
• b)
  B
• c)
  C
• d)
  D

• a)
  20 rad/s
• b)
  20 Hz
• c)
  40 rad/s
• d)
  40 Hz

• a)
  could have, been
• b)
  would have, being
• c)
  had, have
• d)
  had been, been

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)
   8      
• b)
   6        
• c)
   8 m   
• d)
   6π

• a)
    0001
• b)
   0010
• c)
   1101
• d)
   Can not be expressed in 4 bit 2's complement

If the function    is continuous at x = 0 then find f(0)?

• a)
  a − b
• b)
  a
• c)
  b + a
• d)
  None of these

• a)
  0
• b)
  1
• c)
  2
• d)
  3

A lossless coaxial line having inner and outer diameters 5 cm and 10 cm respectively is used as a transmission line for excitation of an antenna with    .The characteristic impedance is ----------------------    (ohms)

• a)
  87.1
• b)
  458
• c)
  25.01
• d)
  0.21

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

• a)
  slow and more reliable
• b)
  fast and more reliable
• c)
  fast and less reliable
• d)
  slow and less reliable

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

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

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

• a)
  easier, than
• b)
  most easy, than
• c)
  easier, from
• d)
  easiest, from

• 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:

  3.0

• B:

  1.0

• C:

  11

• D:

  3.02

The answer is a.

• a)
  Cut-off
• b)
   Active
• c)
  Saturation
• d)
  Pinch-off

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

• a)
   PRAYER
• b)
   SAINT
• c)
   PRIESTHOOD
• d)
   HOLY BOOK

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

• a)
   300 students
• b)
   225 students
• c)
   150 students
• d)
   Can’t be determined

A MUX network is shown in fig.

Que: Z₂ = ?

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

• a)
  2 x 10¹⁶ cm^-3
• b)
  4 x 10¹⁶ cm^-3
• c)
  2 x 10¹⁸ cm^-3
• d)
  4 x 10¹⁸ cm^-3

• a)
  3.6 V
• b)
  9.8 V
• c)
  7.2 V
• d)
  12.3 V

• a)
   as an author of detective stories
• b)
   as brave, smart, and successful with women
• c)
   as tough cunning and courageous
• d)
   as being more impressive than others

• a)
  
• b)
  
• c)
  
• d)
  

Choose the correct sequence :

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• A:
  548
• B:
  254
• C:
  0
• D:
  529

• a)
   She is smart enough to take care of herself in Bombay
• b)
   She is enough smart to take care of oneself in Bombay
• c)
   She is enough smart to take care of herself in Bombay
• d)
   She is smart enough to take care of oneself in Bombay

• a)
  50
• b)
  55
• c)
  54
• d)
  none of these

• a)
  
• b)
  
• c)
  
• d)
  

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

• a)
  13 (A - I₂ )
• b)
  13A - 12 I₂
• c)
  12 (A - I₂)
• d)
  None of these

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)
  0
• b)
  1
• c)
  ∞
• d)
  -1

• a)
  Zero initial condition
• b)
  Non-zero initial condition
• c)
  Zero final condition
• d)
  Non-zero final condition

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

Calculate the power dissipated in 3.Ω resistor

• a)
  4W
• b)
  5.72W
• c)
  7.408W                            
• d)
  OW

• a)
  Human progress and security are positively associated with environmental security
• b)
  Human progress is contradictory to environmental security.
• c)
  Human security is contradictory to environmental security.
• d)
  Human progress depends upon environmental security

The Eigen values of the matrix 

• a)
  1, 1, 2
• b)
  1, 2, 2
• c)
  1, 2, 3
• d)
  None of these

Match the following

• a)
  (P,l), (Q,l) (R,2) (S,2)    
• b)
  (P,2), (Q,l) (R,l) (S,2)
• c)
  (P,l), (Q/2) (R,2) (S,l)    
• d)
  (P,l), (Q,2) (R,l) (S,2)

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

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

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

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