Electronics and Communication Engineering (ECE)

For what value of k will the matrix given below become singular 

is ___________

• a)
  1
• b)
  0
• c)
  5
• d)
  6

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

• a)
  1
• b)
  2
• c)
  4
• d)
  8

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

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)
  e^-t u (t) A
• b)
  (1 - e^-t) u(t)  A
• c)
  u(t) A
• d)
  (2 - e^-t) u(t)  A

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

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)
  Imaginary
• b)
  Conjugate anti-symmetric
• c)
  Conjugate symmetric
• d)
  Real

• a)
  
• b)
  
• c)
  0.53 × 186 Å
• d)
  0.53 × (186)² Å

The Eigen values of the matrix 

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

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

• 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

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

   then find 

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

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

• a)
  10111
• b)
  10011
• c)
  10110
• d)
  10010

• a)
  a and b
• b)
  b and c
• c)
  b, c, and d
• d)
  all

  along the straight line from 

• a)
  
• b)
  
• c)
  
• d)
  

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)
  
• b)
  
• c)
  
• d)
  

• a)
  b
• b)
  a
• c)
  b/a
• d)
  a/b

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

• a)
  a
• b)
  b
• c)
  c
• d)
  d

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

• a)
  
• b)
  
• c)
  
• d)
  

• 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

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

If wave form is given only for I period then

 

Q. Waveform x (t) is

 

• a)
  an even function with half wave symmetry.
• b)
  An odd function with half wave symmetry.
• c)
  an even function with no half wave symmetry.
• d)
  An odd function with no half wave symmetry.

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 MUX network is shown in fig.

Que: Z₂ = ?

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

• 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 :

(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

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

• a)
  hardware program
• b)
  source program
• c)
  object program
• d)
  both (a) and (c)

• a)
  requested that
• b)
  should be give
• c)
  the driving test
• d)
  instead of tomorrow

• 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

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

In the circuit of fig. the 3 dB cutoff frequency is

• a)
  10 kHz
• b)
  1.59 kHz
• c)
  354 Hz
• d)
  689 Hz

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)

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)
  
• b)
  
• c)
  R
• d)
  -R

• a)
  0
• b)
  1
• c)
  ∞
• d)
  -1

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

• a)
  Both A and R are correct and R is the correct explanation of A
• b)
  Both A and R are correct and R is not the correct explanation of A
• c)
   A is true and R is false
• d)
  A is false and R is true

• 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:

  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.

• 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 given circuit, the moving-coil meter gives full-scale deflection reading when the average current
flowing through it is 1mA. The moving coil meter has internal resistance of 50?. Find the value of R that results meter a full scale deflection.

• a)
  9950?
• b)
  1566.5?
• c)
  3133?
• d)
  6266?

Select a suitable figure from the four alternatives that would complete the figure matrix.

• a)
   

  1
• b)
   

  2
• c)
   

  3
• d)
  4

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

In the diagram EC and FB are the two rays parallel to the mirror principal axis. Find the condition on q for which constructive interference at point B occurs between the ray ECB and incident ray FB, given AB = d?

• a)
   
• b)
  
• c)
  
• d)
  

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