Instructions for Frequency Modulation (FM) Step 1: Click on 'Generate Message' button to generate input message signal Step 2: Then click on 'Generate Carrier' button to generate carrier signal. The carrier frequency has to be more than the message frequency and You can change frequencies using sliders Step 3: Click on 'Generate Frequency Modulated Signal' button to generate Frequency Modulated Signal Step 4: Click the 'Show Frequency Spectrums' button to view the FM spectra. Here, β represents the frequency modulation index, given by β = kf*Am/fm​​, where Am​ is the amplitude of the message signal (assumed to be fixed), fm​ is its frequency, and kf​ is the frequency sensitivity 1 Hz Step 1: Generate Message 10 Hz ...

97. The output y(t) of a continuous - time LTI system is found to be 4e -3t u(t), when the input x(t) is u(t). If the input x(t) is e -t u(t) then y(t) is: A. (2e -t - 6e -3t ) u(t) B. (-2e -t + 6e -3t ) u(t) C. (-2e -t + 6e 3t ) u(t) D. (2e -t + 6e -3t ) u(t) Answer: Option B Previous yr Question papers with Full Explanations →

95. What will be total capacity of a cellular telephone systems comprising of 10 clusters with 7 cells in each clusters and there are 10 channels in each cell. A. 70 B. 700 C. 100 D. 7000 Answer: Option B Solution: 10*7*10=700 Previous yr Question papers with Full Explanations →

94. To increase the capacity of a cellular system which of the following is used? A. Cell splitting and cell sectoring B. Co-channel reuse ratio C. Honey comb pattern D. Increase the cluster size Answer: Option A Previous yr Question papers with Full Explanations →

93. GSM (Global systems for Mobile Communication), bands for Phase I and II operates respectively at: A. 900 MHz and 1800 MHz B. 900 MHz and 2100 MHz C. 1800 MHz and 2400 MHz D. 1800 MHz and 2100 MHz Answer: Option A Previous yr Question papers with Full Explanations →

92. Number of cells in a cluster in hexagonal cellular communication system with i = 3 and j = 2, will be: A. 7 B. 12 C. 19 D. 24 Answer: Option C solution: i^2+i*j+j^2 = 24 Previous yr Question papers with Full Explanations →

91. Telephone Traffic in measured: A. with Echo cancelers B. by the relative congestion C. in terms of grade service D. In Erlangs Answer: Option D Previous yr Question papers with Full Explanations →

90. The 8-bit stack pointer (SP) register is used by the 8051 to hold an internal RAM address that is called the top of the stack. When the 8051 is reset, what is the value of SP? A. 00 H B. 07 H C. 20 H D. FF H Anwer: Option B Previous yr Question papers with Full Explanations →