Explore topic-wise MCQs in Electronic Devices and Circuits Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

The auto correlation function of a stationary ergodic random process is shown below.

A. What is the mean value E[X(t)]?
B. 50
C. sqrt(50)
D. 20
E. sqrt(20)
Answer» E. sqrt(20)
Discussion
2.

A stationary random process X(t) is applied to the input of a system for which h(t) = u(t) t2 e(-8t). If E[X(t)] = 2, the mean value of the system’s response Y(t) is

A. 1/128
B. 1/64
C. 3/128
D. 1/32
Answer» D. 1/32
Discussion
3.

Air craft of Jet Airways at Ahmedabad airport arrive according to a Poisson process at a rate of 12 per hour. All aircraft are handled by one air traffic controller. If the controller takes a 2 – minute coffee break, what is the probability that he will miss one or more arriving aircraft?

A. 0.33
B. 0.44
C. 0.55
D. 0.66
Answer» B. 0.44
Discussion
4.

The two-level semi-random binary process is defined by X(t) A or -A where (n 1)T < t < nt and the levels A and -A occur with equal probability. T is a positive constant and n = 0, ±1, ±2. Then the autocorrelation Rxx(t1 = 0.5T, t2 = 0.7T) will be?

A. 1
B. 0
C. A x A
D. 0.5 (A x A)
Answer» D. 0.5 (A x A)
Discussion
5.

The two-level semi-random binary process is defined by X(t) A or -A where (n 1)T < t < nt and the levels A and -A occur with equal probability. T is a positive constant and n = 0, ±1, ±2. What is the mean value of E[X(t)]?

A. 1/2
B. 1/4
C. 1
D. 0
Answer» E.
Discussion
6.

White noise with power density No/2 = 6 microW/Hz is applied to an ideal filter of gain 1 and bandwidth W rad/s. If the output’s average noise power is 15 watts, the bandwidth W is

A. 2.5 x 10 (-6)
B. 2.5p x 10 (-6)
C. 5 x 10 (-6)
D. p5 x 10 (-6)
Answer» C. 5 x 10 (-6)
Discussion