# The Laplace Transform of eαt cos (αt) is equal to

1.  (s-α)/ (s-α)2+α2

2.  (s+α)/ (s-α)2+α2

3.  1/(s-α)2

4.   None of these

4

(s-α)/ (s-α)22

Explanation :
No Explanation available for this question

# loop is

1.  zero

2.  due to rotation only

3.  due to transformer action only

4.  due to both rotation and transformer action

4

due to both rotation and transformer action

Explanation :
No Explanation available for this question

# The far field of an antenna varies with distance r as

1.  1/r

2.  1/r2

3.  1/r3

4.  1/√r

4

1/r

Explanation :
No Explanation available for this question

# A transmission line of 50 Ω characteristic impedance is terminated with a 100 Ω resistance. The minimum impedance measured on the line is equal to

1.  0Ω

2.  25Ω

3.  50Ω

4.  100Ω

4

Explanation :
No Explanation available for this question

# A rectangular air-filled waveguide has cross section of 4 cm x 10 cm. The minimum frequency which can propagate in the waveguide is

1.  1.5GHz

2.  2.0GHz

3.  2.5 GHz

4.  3.0 GHz

4

1.5GHz

Explanation :
No Explanation available for this question

# The line code that has zero dc component for pulse transmission of random binary data is

3.  Alternate Mark Inversion (AM)

4.  None of the above

4

Alternate Mark Inversion (AM)

Explanation :
No Explanation available for this question

# A deterministic signal has the power spectrum given in the figure is. The minimum  sampling rate needed to completely represent this signal is

1.  1 KHz

2.  2 KHz

3.  3KHz

4.  none of these

4

3KHz

Explanation :
No Explanation available for this question

# The voltage V in the figure is

1.  10V

2.  15V

3.  5V

4.  none of these

4

10V

Explanation :
No Explanation available for this question

# In the BJT amplifier shown in the figure is the transistor is based in the forward active region. Putting a capacitor across RE will

1.  decrease the voltage gain and decrease the input impedance

2.  increase the voltage gain and decrease the input impedance

3.    decrease the voltage gain and increase the input impedance

4.  increase the voltage gain and increase the input impedance

4

decrease the voltage gain and decrease the input impedance

Explanation :
No Explanation available for this question

# A cascade amplifier stage is equivalent to

1.  a common emitter stage followed by a common base stage

2.   a common base stage followed by an emitter    follower

3.  an emitter follower stage followed by a common base stage

4.  a common base stage followed by a common emitter stage

4