A signal has frequency components from 300 Hz to 1.8 KHz. The minimum possible rate at which the signal has to be sampled is

1.  3600 samples/sec

2.  4600 samples/sec

3.  5600 samples/sec

4.  6600 samples/sec

View Answer  
4
Correct Answer :

3600 samples/sec




Explanation :
No Explanation available for this question

For the signal constellation shown in the figure, the type of modulation is

1.  Quadrature Phase Shift Keying

View Answer  
1
Correct Answer :

Quadrature Phase Shift Keying


Explanation :
No Explanation available for this question

22. The Column-I lists the attributes and the Column-II lists the modulation system. Match the attributer to the system. Match the attribute to the modulation system that best meets it Column-I P. Power efficient transmission signals Q. Most bans width efficient R. Simplest receiver structure S.Bandwidth efficient transmission of signals with significant dc. component Column-II 1. Conventional AM 2. FM 3. VSB d. SSB-SC

1.   4 2 1 3

2.  2 4 1 3

3.  3 2 1 4

4.  2 4 3 1

View Answer  
4
Correct Answer :

4 2 1 3




Explanation :
No Explanation available for this question

The trigonometric Fourier series for the waveform f(t) shown below contains

1.   Only cosine terms and zero value for the dc component

2.  Only cosine terms and a positive value for the dc component

3.  Only cosine terms and a negative value for the dc component

4.  Only sine terms and a negative value for the dc component

View Answer  
4
Correct Answer :

Only cosine terms and a positive value for the dc component


Explanation :
No Explanation available for this question

An S-R Flip-Flop can be converted into a T FLIP-FLOP by connecting ___to Q and ____to

1.   R=TQn

2.    R=RQn        

3.   R=QQn

4.   R=EQn

View Answer  
4
Correct Answer :

R=TQn


Explanation :
No Explanation available for this question

In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2 The value of current I0 is approximately    

1.   0.5 mA

2.  2 mA

3.   9.3 mA

4.  15 mA

View Answer  
4
Correct Answer :

2 mA


Explanation :
No Explanation available for this question

The amplifier circuit shown below uses a silicon transistor. The capacitors CC and CE can be assumed to be short at signal frequency and the effect of output resistances r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is TRUE  

1.  The input resistance Ri increases and the magnitude of voltage gain AV decreases

2.  The input resistance Ri decreases and the magnitude of voltage gain AV increases

3.  Both input resistance Ri and the magnitude of voltage gain AV decrease

4.  Both input resistance Ri and the magnitude of voltage gain AV increase

View Answer  
4
Correct Answer :

The input resistance Ri increases and the magnitude of voltage gain AV decreases


Explanation :
No Explanation available for this question

In circuit shown below, capacitors C1 and C2 are very large and are shorts at the input frequency. Vi is a small signal input. The gain magnitude |v0/vi| at 10 Mrad/s is  

1.  Maximum

2.  Minimum

3.  Unity

4.  Zero

View Answer  
4
Correct Answer :

Maximum




Explanation :
No Explanation available for this question

The current ib through the base of a silicon npn transistor is 1 + 0.1 cos (1000 π t) mA. At 300K, the rπ in the small signal model of the transistor is  

1.   250 Ω

2.  27.5 Ω

3.  25 Ω

4.   22.5 Ω

View Answer  
4
Correct Answer :

25 Ω


Explanation :
No Explanation available for this question

Which of the following statements are correct for basic transform amplifier configurations  

1.  CB Amplifiers has low input impendence and low current gain

2.  CC Amplifiers has low output impendence and high current gain

3.  CE Amplifier has very poor voltage  gain but very high input impedance

4.  The current gain of CB Amplifier is higher than the current gain of CC amplifier

View Answer  
4
Correct Answer :

CC Amplifiers has low output impendence and high current gain


Explanation :
No Explanation available for this question
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