# An AM signal and a narrow-band FM signal with identical carriers, modulating signals andmodulation  indices  of  0.1  are  added  together.  The  resultant  signal  can  be  closelyapproximated by

2.  SSB with carrier

3.  DSB-SC

4.  SSB without carrier

4

SSB with carrier

Explanation :
No Explanation available for this question

# In  the  output  of  a DM  speech  encoder,  the  consecutive  pulses  are  of  opposite  polarityduring time interval t1 ≤ t ≤ t2.This indicates that during this interval

1.  the input to the modulator is essentially constant

2.    the modulator is going through slope overload

3.   the accumulator is in saturation

4.  the speech signal is being sampled at the Nyquist rate

4

the input to the modulator is essentially constant

Explanation :
No Explanation available for this question

# The  phase  velocity  of  an  electromagnetic  wave  propagating  in  a  hallow  metallicrectangular waveguide in the TE10 mode is

1.  equal to its group velocity

2.   less than the velocity of light in free space

3.  equal to the velocity of light in free space

4.  greater than the velocity of light in free space

4

greater than the velocity of light in free space

Explanation :
No Explanation available for this question

# Consider a lossless antenna with a directive gain of +6db. If 1 mW of power is fed to it thetotal power radiated by the antenna will be

1.  4 mW

2.  1 mW

3.  7 mW

4.  (1/4) mW

4

4 mW

Explanation :
No Explanation available for this question

# The transfer function H (s) = (V0(s))/(Vi(s)) of an R-L-C circuit is given by H (s) = 106/(s2 + 20s 106)The Quality factor (Q-factor) of this circuit is

1.  25

2.  50

3.  100

4.  5000

4

50

Explanation :
No Explanation available for this question

# A system described by the following differential equation (d2y/dt2) + 3(dy/dt) + 2y = x(t)  isinitially at rest. For input x(t) = 2u(t), the output y(t) is

1.  (1 - 2e-t + e-2t) u (t)

2.  (1 + 2e-t - e-2t) u (t)

3.  (0.5 + e-t+ 1.5e-2t) u (t)

4.  (0.5 + 2e-t+ 2e-2t) u (t)

4

(1 - 2e-t + e-2t) u (t)

Explanation :
No Explanation available for this question

# Consider the following statements S1 and S2 S1:  At the resonant frequency the impedance of a series R-L-C circuit is zero. S2:    In a parallel G-L-C circuit,  increasing  the conductance G  results  in  increase  in  its Qfactor. Which one of the following is correct

1.  S1 is FALSE and S2 is TRUE

2.   both S1 and S2 are TRUE

3.  S1 is TRUE and S2 is FALSE

4.   both S1 and S2 are FALSE

4

both S1 and S2 are FALSE

Explanation :
No Explanation available for this question

# In  an  abrupt  p-n  junction,  the  doping  concentrations  on p-side  and  n-side  are NA  =  9  x1016/cm3 and ND = 1 x 1016/cm3 respectively. The p-n junction is reverse biased and the total depletion width is 3 μm. The depletion width on the p-side is

1.  2.7 μm

2.  0.3 μm

3.  2.25 μm

4.  0.75 μm

4

0.3 μm

Explanation :
No Explanation available for this question

# Consider the following statements S1 and S2. S1 : The threshold voltage (VT) of a MOS capacitor decreases with increase in gate oxidethickness S2  : The  threshold voltage (VT) of a MOS capacitor decreases with  increase  in substratedoping concentration. Which one of the following is correct

1.  S1 is FALSE and S2 is TRUE

2.  both S1 and S2 are TRUE

3.  S1 is TRUE and S2 is FALSE

4.  both S1 and S2 are FALSE

4

S1 is FALSE and S2 is TRUE

Explanation :
No Explanation available for this question

1.  2 mA

2.  3 mA

3.  9 mA

4.  4 mA

4