CS U-2,3

The phase of balanced slope detector is ______

• a) 90 degrees

• b) 45 degrees

• c) 135 degrees

• d)180 degrees out of phase

Which of the following is the disadvantage of foster delay phase detector?

• a) Linearity

• b)Non Linearity

• c) Same frequency

• d) Limitation in amplitude

The value of free running frequency in PLL is made equal to _____ in FM wave.

• a)Carrier Frequency

• b) Original data

• c) Message Frequency

• d ) Both a and c

If calls arrive at a telephone exchange such that the time of arrival of any call is independent of the time of arrival of earlier or future calls, the probability distribution function of the total number of calls in a fixed time interval will be ______

• a) Poisson

• b) Gaussian

• c)Exponential

• d) Gamma

The random process is a function of __________________

• a)Time

• b) Random Variables 

• c) Both a and b  

• d) None of the above

Amplitude limiter in FM receivers are used to ____

• a) Remove amplitude variations due to noise

• b) Filtration

• c) Demodulation

• d) Amplification

Balanced type slope detector is connected to opposite ends of _____

• a)Load

• b) Capacitor

• C) Open circuited

• D) Central tapped Transformer

Which of the following is the output applied to FM demodulator?

• a) Frequency Variation

• b) Amplitude Variation

• c) Phase Variation

• d) All the above

A white Gaussian noise ω(t) with zero mean and power spectral density N0/2,when applied to a first-order RC low pass filter produces an output n(t). At a particular time t=tk,the variance of the random variable n(tk) is _____

• a) N0/4RC

• b) N0/RC

• c) 2N0/RC

• d) N0/2RC

The auto correlation function of a stationary ergodic random process is shown below. The mean value E[X(t)] is __

• a) 50

• b) sqrt(50)

• c) 20

• d) sqrt(20)