# The bandgap of Silicon at room temperature is

1.  1.3 eV

2.  0.7 eV

3.  1.1 eV

4.  1.4 eV

4

1.1 eV

Explanation :
No Explanation available for this question

# A Silicon PN junction at a temperature of 20°C has a reverse saturation current of 10 pico Amperes (pA). The reverse saturation current at 40° C for the same bias is approximately

1.  30 pA

2.  40 pA.

3.  50 pA.

4.  60 pA.

4

40 pA.

Explanation :
No Explanation available for this question

# The primary reason for the widespread use of Silicon in semiconductor device technology is

1.  aboundance of Silicon on the surface of the Earth.

2.   larger bandgap of Silicon in comparison to Germanium.

3.   favorable properties of Silicon-dioxide (SiO2).

4.  lower melting point.

4

favorable properties of Silicon-dioxide (SiO2).

Explanation :
No Explanation available for this question

# A load of 50 Ω is connected in shunt in a 2-wire transmission line of Z0 = 50 Ω as shown in the figure. The 2-port scattering parameter matrix (S - matrix) of the shunt element is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The  parallel  branches  of  a  2-wire  transmission  line  are  terminated  in  100  Ω  and  200  Ω resistors as shown in the figure. The characteristic impedance of the line is Z0 = 50 Ω and each section has a length of (λ0/2). The voltage reflection coefficient I- at the input is

1.  -j(7/5)

2.  ((-5)/7)

3.  j(5/7)

4.  5/7

4

5/7

Explanation :
No Explanation available for this question

# The effect of current shunt feedback in an amplifier is to

1.  increase the input resistance and decrease the output resistance.

2.   increase both input and output resistances.

3.  decrease both input and output resistances

4.  decrease the input resistance and increase the output resistance

4

decrease the input resistance and increase the output resistance

Explanation :
No Explanation available for this question

# A λ/2   dipole  is  kept horizontally at a height of  λ 0/2  above  a  perfectly  conducting  infinite ground  plane.  The  radiation  pattern  in  the  plane  of  the  dipole  (   plane)  looks approximately as

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The input resistance Ri of the amplifier shown in the figure is

1.  (30/4) kΩ

2.  10 kΩ

3.  40 kΩ

4.  infinite

4

10 kΩ

Explanation :
No Explanation available for this question

# A right circularly polarized (RCP) plane wave is incident at an angle of 60º  to  the normal. on  an  air-dielectric  interface.  If  the  reflected  wave  is  linearly  polarized,  the  relative dielectric constant εr2 is

1.  √2

2.  √3

3.  2

4.  3

4

3

Explanation :
No Explanation available for this question

# The  first  and  the  last  critical  frequency  of  an RC-driving  point  impedance  function mu respectively be

1.  a zero and a pole

2.  a zero and a zero

3.   a pole and a pole

4.   a pole and a zero

4