# The phase velocity of waves propagating in a hollow metal waveguide is

1.  greater than the velocity of light in free space

2.  less than the velocity of light in free space

3.  equal to the velocity of light in free space

4.  equal to the group velocity

4

greater than the velocity of light in free space

Explanation :
No Explanation available for this question

# The dominant mode in a rectangular wave guide is TE10,because this mode has

1.  no attenuation

2.  no cut-off

3.  no magnetic field component

4.  the highest cut-off wavelength

4

the highest cut-off wavelength

Explanation :
No Explanation available for this question

# The voltage e0 in the figure

1.  48V

2.  24V

3.  36V

4.  28V

4

28V

Explanation :
No Explanation available for this question

# The dependent current source shown in Figure

1.  delivers 80 W

2.  absorbs 80 W

3.  delivers 40 W

4.  absorbs 40 W

4

delivers 80 W

Explanation :
No Explanation available for this question

# In the figure, the value of the load resistor R which maximizes the power delivered to it is

1.  14.14Ω

2.  10Ω

3.  200Ω

4.  28.28Ω

4

14.14Ω

Explanation :
No Explanation available for this question

# In figure 1.2, the switch was closed for a long time before opening at t = 0. the voltage Vx at t = 0+ is

1.  25 V

2.  50 V

3.  -50 V

4.  0 V

4

-50 V

Explanation :
No Explanation available for this question

# Convolution of x(t + 5) with impulse function δ(t – 7) is equal to

1.  x(t - 12)

2.  x(t + 12)

3.  x(t - 2)

4.  x(t + 2)

4

x(t - 2)

Explanation :
No Explanation available for this question

# Which  of  the  following  cannot  be  the  Fourier  series  expansion  of  a  periodic signal

1.  x(t) = 2cos t + 3 cos 3t

2.  x(t) = 2cos πt + 7 cos t

3.  x(t) = cos t + 0.5

4.  x(t) = 2cos 1.5πt + sin 3.5 πt

4

x(t) = 2cos πt + 7 cos t

Explanation :
No Explanation available for this question

# In  Figure  1.5,  a  silicon  is  carrying  a  constant  current  of  1  mA.  When  the temperature of the diode  is 20°C, VD  is found to be 700 mV. If the temperature rises to 40°C, VD becomes approximately equal to

1.  740 mV

2.  660 mV

3.  680 mV

4.  700 mV

4

660 mV

Explanation :
No Explanation available for this question

# In  a  negative  feedback  amplifier  using  voltage-series  (i.e.  voltage-sampling series  mixing)  feedback.  (Ri  and  Ro  denote  the  input  and  output  resistance respectively)

1.  Ri decreases and Ro decreases

2.  Ri decreases and Ro increases

3.  Ri increases and Ro decreases

4.  Ri increases and Ro increases

4